mirror of
https://github.com/yuzu-emu/unicorn
synced 2024-11-24 23:48:27 +00:00
1504 lines
48 KiB
C
1504 lines
48 KiB
C
/*
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* Optimizations for Tiny Code Generator for QEMU
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*
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* Copyright (c) 2010 Samsung Electronics.
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* Contributed by Kirill Batuzov <batuzovk@ispras.ru>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "qemu-common.h"
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#include "exec/cpu-common.h"
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#include "tcg-op.h"
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#define CASE_OP_32_64(x) \
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glue(glue(case INDEX_op_, x), _i32): \
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glue(glue(case INDEX_op_, x), _i64)
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#define CASE_OP_32_64_VEC(x) \
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glue(glue(case INDEX_op_, x), _i32): \
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glue(glue(case INDEX_op_, x), _i64): \
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glue(glue(case INDEX_op_, x), _vec)
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static inline struct tcg_temp_info *ts_info(TCGTemp *ts)
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{
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return ts->state_ptr;
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}
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static inline struct tcg_temp_info *arg_info(TCGArg arg)
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{
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return ts_info(arg_temp(arg));
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}
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static inline bool ts_is_const(TCGTemp *ts)
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{
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return ts_info(ts)->is_const;
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}
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static inline bool arg_is_const(TCGArg arg)
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{
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return ts_is_const(arg_temp(arg));
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}
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static inline bool ts_is_copy(TCGTemp *ts)
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{
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return ts_info(ts)->next_copy != ts;
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}
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/* Reset TEMP's state, possibly removing the temp for the list of copies. */
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static void reset_ts(TCGTemp *ts)
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{
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struct tcg_temp_info *ti = ts_info(ts);
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struct tcg_temp_info *pi = ts_info(ti->prev_copy);
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struct tcg_temp_info *ni = ts_info(ti->next_copy);
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ni->prev_copy = ti->prev_copy;
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pi->next_copy = ti->next_copy;
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ti->next_copy = ts;
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ti->prev_copy = ts;
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ti->is_const = false;
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ti->mask = -1;
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}
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static void reset_temp(TCGContext *s, TCGArg arg)
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{
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reset_ts(arg_temp(arg));
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}
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/* Reset all temporaries, given that there are NB_TEMPS of them. */
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static void reset_all_temps(TCGContext *s, int nb_temps)
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{
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long len = BITS_TO_LONGS(nb_temps) * sizeof(unsigned long);
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memset(&s->temps2_used.l, 0, len);
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}
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/* Initialize and activate a temporary. */
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static void init_ts_info(TCGContext *s, TCGTemp *ts)
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{
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struct tcg_temp_info *temps = s->temps2;
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TCGTempSet *temps_used = &s->temps2_used;
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size_t idx = temp_idx(s, ts);
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if (!test_bit(idx, temps_used->l)) {
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struct tcg_temp_info *ti = &temps[idx];
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ts->state_ptr = ti;
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ti->next_copy = ts;
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ti->prev_copy = ts;
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ti->is_const = false;
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ti->mask = -1;
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set_bit(idx, temps_used->l);
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}
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}
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static void init_arg_info(TCGContext *s, TCGArg arg)
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{
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init_ts_info(s, arg_temp(arg));
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}
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static TCGTemp *find_better_copy(TCGTemp *ts)
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{
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TCGTemp *i;
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/* If this is already a global, we can't do better. */
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if (ts->temp_global) {
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return ts;
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}
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/* Search for a global first. */
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for (i = ts_info(ts)->next_copy; i != ts; i = ts_info(i)->next_copy) {
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if (i->temp_global) {
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return i;
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}
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}
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/* If it is a temp, search for a temp local. */
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if (!ts->temp_local) {
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for (i = ts_info(ts)->next_copy; i != ts; i = ts_info(i)->next_copy) {
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if (ts->temp_local) {
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return i;
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}
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}
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}
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/* Failure to find a better representation, return the same temp. */
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return ts;
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}
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static bool ts_are_copies(TCGTemp *ts1, TCGTemp *ts2)
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{
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TCGTemp *i;
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if (ts1 == ts2) {
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return true;
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}
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if (!ts_is_copy(ts1) || !ts_is_copy(ts2)) {
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return false;
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}
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for (i = ts_info(ts1)->next_copy; i != ts1; i = ts_info(i)->next_copy) {
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if (i == ts2) {
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return true;
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}
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}
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return false;
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}
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static bool args_are_copies(TCGArg arg1, TCGArg arg2)
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{
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return ts_are_copies(arg_temp(arg1), arg_temp(arg2));
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}
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static void tcg_opt_gen_movi(TCGContext *s, TCGOp *op, TCGArg dst, TCGArg val)
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{
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const TCGOpDef *def;
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TCGOpcode new_op;
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tcg_target_ulong mask;
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struct tcg_temp_info *di = arg_info(dst);
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def = &s->tcg_op_defs[op->opc];
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if (def->flags & TCG_OPF_VECTOR) {
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new_op = INDEX_op_dupi_vec;
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} else if (def->flags & TCG_OPF_64BIT) {
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new_op = INDEX_op_movi_i64;
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} else {
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new_op = INDEX_op_movi_i32;
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}
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op->opc = new_op;
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/* TCGOP_VECL and TCGOP_VECE remain unchanged. */
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op->args[0] = dst;
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op->args[1] = val;
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reset_temp(s, dst);
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di->is_const = true;
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di->val = val;
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mask = val;
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if (TCG_TARGET_REG_BITS > 32 && new_op == INDEX_op_movi_i32) {
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/* High bits of the destination are now garbage. */
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mask |= ~0xffffffffull;
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}
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di->mask = mask;
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}
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static void tcg_opt_gen_mov(TCGContext *s, TCGOp *op, TCGArg dst, TCGArg src)
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{
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TCGTemp *dst_ts = arg_temp(dst);
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TCGTemp *src_ts = arg_temp(src);
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const TCGOpDef *def;
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struct tcg_temp_info *di;
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struct tcg_temp_info *si;
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tcg_target_ulong mask;
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TCGOpcode new_op;
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if (ts_are_copies(dst_ts, src_ts)) {
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tcg_op_remove(s, op);
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return;
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}
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reset_ts(dst_ts);
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di = ts_info(dst_ts);
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si = ts_info(src_ts);
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def = &s->tcg_op_defs[op->opc];
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if (def->flags & TCG_OPF_VECTOR) {
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new_op = INDEX_op_mov_vec;
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} else if (def->flags & TCG_OPF_64BIT) {
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new_op = INDEX_op_mov_i64;
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} else {
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new_op = INDEX_op_mov_i32;
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}
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op->opc = new_op;
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/* TCGOP_VECL and TCGOP_VECE remain unchanged. */
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op->args[0] = dst;
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op->args[1] = src;
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mask = si->mask;
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if (TCG_TARGET_REG_BITS > 32 && new_op == INDEX_op_mov_i32) {
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/* High bits of the destination are now garbage. */
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mask |= ~0xffffffffull;
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}
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di->mask = mask;
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if (src_ts->type == dst_ts->type) {
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struct tcg_temp_info *ni = ts_info(si->next_copy);
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di->next_copy = si->next_copy;
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di->prev_copy = src_ts;
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ni->prev_copy = dst_ts;
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si->next_copy = dst_ts;
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di->is_const = si->is_const;
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di->val = si->val;
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}
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}
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static TCGArg do_constant_folding_2(TCGOpcode op, TCGArg x, TCGArg y)
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{
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uint64_t l64, h64;
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switch (op) {
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CASE_OP_32_64(add):
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return x + y;
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CASE_OP_32_64(sub):
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return x - y;
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CASE_OP_32_64(mul):
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return x * y;
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CASE_OP_32_64(and):
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return x & y;
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CASE_OP_32_64(or):
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return x | y;
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CASE_OP_32_64(xor):
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return x ^ y;
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case INDEX_op_shl_i32:
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return (uint32_t)x << (y & 31);
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case INDEX_op_shl_i64:
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return (uint64_t)x << (y & 63);
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case INDEX_op_shr_i32:
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return (uint32_t)x >> (y & 31);
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case INDEX_op_shr_i64:
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return (uint64_t)x >> (y & 63);
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case INDEX_op_sar_i32:
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return (int32_t)x >> (y & 31);
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case INDEX_op_sar_i64:
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return (int64_t)x >> (y & 63);
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case INDEX_op_rotr_i32:
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return ror32(x, y & 31);
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case INDEX_op_rotr_i64:
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return (TCGArg)ror64(x, y & 63);
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case INDEX_op_rotl_i32:
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return rol32(x, y & 31);
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case INDEX_op_rotl_i64:
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return (TCGArg)rol64(x, y & 63);
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CASE_OP_32_64(not):
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return ~x;
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CASE_OP_32_64(neg):
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return 0-x;
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CASE_OP_32_64(andc):
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return x & ~y;
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CASE_OP_32_64(orc):
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return x | ~y;
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CASE_OP_32_64(eqv):
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return ~(x ^ y);
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CASE_OP_32_64(nand):
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return ~(x & y);
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CASE_OP_32_64(nor):
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return ~(x | y);
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case INDEX_op_clz_i32:
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return (uint32_t)x ? clz32(x) : y;
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case INDEX_op_clz_i64:
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return x ? clz64(x) : y;
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case INDEX_op_ctz_i32:
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return (uint32_t)x ? ctz32(x) : y;
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case INDEX_op_ctz_i64:
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return x ? ctz64(x) : y;
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case INDEX_op_ctpop_i32:
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return ctpop32(x);
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case INDEX_op_ctpop_i64:
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return ctpop64(x);
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CASE_OP_32_64(ext8s):
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return (int8_t)x;
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CASE_OP_32_64(ext16s):
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return (int16_t)x;
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CASE_OP_32_64(ext8u):
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return (uint8_t)x;
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CASE_OP_32_64(ext16u):
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return (uint16_t)x;
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case INDEX_op_ext_i32_i64:
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case INDEX_op_ext32s_i64:
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return (int32_t)x;
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case INDEX_op_extu_i32_i64:
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case INDEX_op_extrl_i64_i32:
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case INDEX_op_ext32u_i64:
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return (uint32_t)x;
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case INDEX_op_extrh_i64_i32:
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return (uint64_t)x >> 32;
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case INDEX_op_muluh_i32:
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return ((uint64_t)(uint32_t)x * (uint32_t)y) >> 32;
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case INDEX_op_mulsh_i32:
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return ((int64_t)(int32_t)x * (int32_t)y) >> 32;
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case INDEX_op_muluh_i64:
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mulu64(&l64, &h64, x, y);
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return (TCGArg)h64;
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case INDEX_op_mulsh_i64:
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muls64(&l64, &h64, x, y);
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return (TCGArg)h64;
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case INDEX_op_div_i32:
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/* Avoid crashing on divide by zero, otherwise undefined. */
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return (int32_t)x / ((int32_t)y ? (int32_t)y : 1);
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case INDEX_op_divu_i32:
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return (uint32_t)x / ((uint32_t)y ? (uint32_t)y : 1);
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case INDEX_op_div_i64:
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return (int64_t)x / ((int64_t)y ? (int64_t)y : 1);
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case INDEX_op_divu_i64:
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return (uint64_t)x / ((uint64_t)y ? (uint64_t)y : 1);
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case INDEX_op_rem_i32:
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return (int32_t)x % ((int32_t)y ? (int32_t)y : 1);
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case INDEX_op_remu_i32:
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return (uint32_t)x % ((uint32_t)y ? (uint32_t)y : 1);
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case INDEX_op_rem_i64:
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return (int64_t)x % ((int64_t)y ? (int64_t)y : 1);
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case INDEX_op_remu_i64:
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return (uint64_t)x % ((uint64_t)y ? (uint64_t)y : 1);
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default:
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fprintf(stderr,
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"Unrecognized operation %d in do_constant_folding.\n", op);
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tcg_abort();
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}
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}
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static TCGArg do_constant_folding(TCGContext *s, TCGOpcode op, TCGArg x, TCGArg y)
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{
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const TCGOpDef *def = &s->tcg_op_defs[op];
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TCGArg res = do_constant_folding_2(op, x, y);
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if (!(def->flags & TCG_OPF_64BIT)) {
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res = (int32_t)res;
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}
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return res;
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}
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static bool do_constant_folding_cond_32(uint32_t x, uint32_t y, TCGCond c)
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{
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switch (c) {
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case TCG_COND_EQ:
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return x == y;
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case TCG_COND_NE:
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return x != y;
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case TCG_COND_LT:
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return (int32_t)x < (int32_t)y;
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case TCG_COND_GE:
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return (int32_t)x >= (int32_t)y;
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case TCG_COND_LE:
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return (int32_t)x <= (int32_t)y;
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case TCG_COND_GT:
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return (int32_t)x > (int32_t)y;
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case TCG_COND_LTU:
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return x < y;
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case TCG_COND_GEU:
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return x >= y;
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case TCG_COND_LEU:
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return x <= y;
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case TCG_COND_GTU:
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return x > y;
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default:
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tcg_abort();
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}
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}
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static bool do_constant_folding_cond_64(uint64_t x, uint64_t y, TCGCond c)
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{
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switch (c) {
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case TCG_COND_EQ:
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return x == y;
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case TCG_COND_NE:
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return x != y;
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case TCG_COND_LT:
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return (int64_t)x < (int64_t)y;
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case TCG_COND_GE:
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return (int64_t)x >= (int64_t)y;
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case TCG_COND_LE:
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return (int64_t)x <= (int64_t)y;
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case TCG_COND_GT:
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return (int64_t)x > (int64_t)y;
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case TCG_COND_LTU:
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return x < y;
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case TCG_COND_GEU:
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return x >= y;
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case TCG_COND_LEU:
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return x <= y;
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case TCG_COND_GTU:
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return x > y;
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default:
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tcg_abort();
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}
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}
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static bool do_constant_folding_cond_eq(TCGCond c)
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{
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switch (c) {
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case TCG_COND_GT:
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case TCG_COND_LTU:
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case TCG_COND_LT:
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case TCG_COND_GTU:
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case TCG_COND_NE:
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return 0;
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case TCG_COND_GE:
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case TCG_COND_GEU:
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case TCG_COND_LE:
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case TCG_COND_LEU:
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case TCG_COND_EQ:
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return 1;
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default:
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tcg_abort();
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}
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}
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/* Return 2 if the condition can't be simplified, and the result
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of the condition (0 or 1) if it can */
|
|
static TCGArg do_constant_folding_cond(TCGContext *s, TCGOpcode op, TCGArg x,
|
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TCGArg y, TCGCond c)
|
|
{
|
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tcg_target_ulong xv = arg_info(x)->val;
|
|
tcg_target_ulong yv = arg_info(y)->val;
|
|
if (arg_is_const(x) && arg_is_const(y)) {
|
|
const TCGOpDef *def = &s->tcg_op_defs[op];
|
|
tcg_debug_assert(!(def->flags & TCG_OPF_VECTOR));
|
|
if (def->flags & TCG_OPF_64BIT) {
|
|
return do_constant_folding_cond_64(xv, yv, c);
|
|
} else {
|
|
return do_constant_folding_cond_32(xv, yv, c);
|
|
}
|
|
} else if (args_are_copies(x, y)) {
|
|
return do_constant_folding_cond_eq(c);
|
|
} else if (arg_is_const(y) && yv == 0) {
|
|
switch (c) {
|
|
case TCG_COND_LTU:
|
|
return 0;
|
|
case TCG_COND_GEU:
|
|
return 1;
|
|
default:
|
|
return 2;
|
|
}
|
|
}
|
|
return 2;
|
|
}
|
|
|
|
/* Return 2 if the condition can't be simplified, and the result
|
|
of the condition (0 or 1) if it can */
|
|
static TCGArg do_constant_folding_cond2(TCGContext *s, TCGArg *p1, TCGArg *p2, TCGCond c)
|
|
{
|
|
TCGArg al = p1[0], ah = p1[1];
|
|
TCGArg bl = p2[0], bh = p2[1];
|
|
|
|
if (arg_is_const(bl) && arg_is_const(bh)) {
|
|
tcg_target_ulong blv = arg_info(bl)->val;
|
|
tcg_target_ulong bhv = arg_info(bh)->val;
|
|
uint64_t b = deposit64(blv, 32, 32, bhv);
|
|
|
|
if (arg_is_const(al) && arg_is_const(ah)) {
|
|
tcg_target_ulong alv = arg_info(al)->val;
|
|
tcg_target_ulong ahv = arg_info(ah)->val;
|
|
uint64_t a = deposit64(alv, 32, 32, ahv);
|
|
return do_constant_folding_cond_64(a, b, c);
|
|
}
|
|
if (b == 0) {
|
|
switch (c) {
|
|
case TCG_COND_LTU:
|
|
return 0;
|
|
case TCG_COND_GEU:
|
|
return 1;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (args_are_copies(al, bl) && args_are_copies(ah, bh)) {
|
|
return do_constant_folding_cond_eq(c);
|
|
}
|
|
return 2;
|
|
}
|
|
|
|
static bool swap_commutative(TCGContext *s, TCGArg dest, TCGArg *p1, TCGArg *p2)
|
|
{
|
|
TCGArg a1 = *p1, a2 = *p2;
|
|
int sum = 0;
|
|
sum += arg_is_const(a1);
|
|
sum -= arg_is_const(a2);
|
|
|
|
/* Prefer the constant in second argument, and then the form
|
|
op a, a, b, which is better handled on non-RISC hosts. */
|
|
if (sum > 0 || (sum == 0 && dest == a2)) {
|
|
*p1 = a2;
|
|
*p2 = a1;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool swap_commutative2(TCGContext *s, TCGArg *p1, TCGArg *p2)
|
|
{
|
|
int sum = 0;
|
|
sum += arg_is_const(p1[0]);
|
|
sum += arg_is_const(p1[1]);
|
|
sum -= arg_is_const(p2[0]);
|
|
sum -= arg_is_const(p2[1]);
|
|
if (sum > 0) {
|
|
TCGArg t;
|
|
t = p1[0], p1[0] = p2[0], p2[0] = t;
|
|
t = p1[1], p1[1] = p2[1], p2[1] = t;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/* Propagate constants and copies, fold constant expressions. */
|
|
void tcg_optimize(TCGContext *s)
|
|
{
|
|
int nb_temps, nb_globals;
|
|
TCGOp *op, *op_next, *prev_mb = NULL;
|
|
|
|
/* Array VALS has an element for each temp.
|
|
If this temp holds a constant then its value is kept in VALS' element.
|
|
If this temp is a copy of other ones then the other copies are
|
|
available through the doubly linked circular list. */
|
|
|
|
nb_temps = s->nb_temps;
|
|
nb_globals = s->nb_globals;
|
|
reset_all_temps(s, nb_temps);
|
|
|
|
QTAILQ_FOREACH_SAFE(op, &s->ops, link, op_next) {
|
|
tcg_target_ulong mask, partmask, affected;
|
|
int nb_oargs, nb_iargs, i;
|
|
TCGArg tmp;
|
|
TCGOpcode opc = op->opc;
|
|
const TCGOpDef *def = &s->tcg_op_defs[opc];
|
|
|
|
/* Count the arguments, and initialize the temps that are
|
|
going to be used */
|
|
if (opc == INDEX_op_call) {
|
|
nb_oargs = TCGOP_CALLO(op);
|
|
nb_iargs = TCGOP_CALLI(op);
|
|
for (i = 0; i < nb_oargs + nb_iargs; i++) {
|
|
TCGTemp *ts = arg_temp(op->args[i]);
|
|
if (ts) {
|
|
init_ts_info(s, ts);
|
|
}
|
|
}
|
|
} else {
|
|
nb_oargs = def->nb_oargs;
|
|
nb_iargs = def->nb_iargs;
|
|
for (i = 0; i < nb_oargs + nb_iargs; i++) {
|
|
init_arg_info(s, op->args[i]);
|
|
}
|
|
}
|
|
|
|
/* Do copy propagation */
|
|
for (i = nb_oargs; i < nb_oargs + nb_iargs; i++) {
|
|
TCGTemp *ts = arg_temp(op->args[i]);
|
|
if (ts && ts_is_copy(ts)) {
|
|
op->args[i] = temp_arg(find_better_copy(ts));
|
|
}
|
|
}
|
|
|
|
/* For commutative operations make constant second argument */
|
|
switch (opc) {
|
|
CASE_OP_32_64_VEC(add):
|
|
CASE_OP_32_64_VEC(mul):
|
|
CASE_OP_32_64_VEC(and):
|
|
CASE_OP_32_64_VEC(or):
|
|
CASE_OP_32_64_VEC(xor):
|
|
CASE_OP_32_64(eqv):
|
|
CASE_OP_32_64(nand):
|
|
CASE_OP_32_64(nor):
|
|
CASE_OP_32_64(muluh):
|
|
CASE_OP_32_64(mulsh):
|
|
swap_commutative(s, op->args[0], &op->args[1], &op->args[2]);
|
|
break;
|
|
CASE_OP_32_64(brcond):
|
|
if (swap_commutative(s, -1, &op->args[0], &op->args[1])) {
|
|
op->args[2] = tcg_swap_cond(op->args[2]);
|
|
}
|
|
break;
|
|
CASE_OP_32_64(setcond):
|
|
if (swap_commutative(s, op->args[0], &op->args[1], &op->args[2])) {
|
|
op->args[3] = tcg_swap_cond(op->args[3]);
|
|
}
|
|
break;
|
|
CASE_OP_32_64(movcond):
|
|
if (swap_commutative(s, -1, &op->args[1], &op->args[2])) {
|
|
op->args[5] = tcg_swap_cond(op->args[5]);
|
|
}
|
|
/* For movcond, we canonicalize the "false" input reg to match
|
|
the destination reg so that the tcg backend can implement
|
|
a "move if true" operation. */
|
|
if (swap_commutative(s, op->args[0], &op->args[4], &op->args[3])) {
|
|
op->args[5] = tcg_invert_cond(op->args[5]);
|
|
}
|
|
break;
|
|
CASE_OP_32_64(add2):
|
|
swap_commutative(s, op->args[0], &op->args[2], &op->args[4]);
|
|
swap_commutative(s, op->args[1], &op->args[3], &op->args[5]);
|
|
break;
|
|
CASE_OP_32_64(mulu2):
|
|
CASE_OP_32_64(muls2):
|
|
swap_commutative(s, op->args[0], &op->args[2], &op->args[3]);
|
|
break;
|
|
case INDEX_op_brcond2_i32:
|
|
if (swap_commutative2(s, &op->args[0], &op->args[2])) {
|
|
op->args[4] = tcg_swap_cond(op->args[4]);
|
|
}
|
|
break;
|
|
case INDEX_op_setcond2_i32:
|
|
if (swap_commutative2(s, &op->args[1], &op->args[3])) {
|
|
op->args[5] = tcg_swap_cond(op->args[5]);
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* Simplify expressions for "shift/rot r, 0, a => movi r, 0",
|
|
and "sub r, 0, a => neg r, a" case. */
|
|
switch (opc) {
|
|
CASE_OP_32_64(shl):
|
|
CASE_OP_32_64(shr):
|
|
CASE_OP_32_64(sar):
|
|
CASE_OP_32_64(rotl):
|
|
CASE_OP_32_64(rotr):
|
|
if (arg_is_const(op->args[1])
|
|
&& arg_info(op->args[1])->val == 0) {
|
|
tcg_opt_gen_movi(s, op, op->args[0], 0);
|
|
continue;
|
|
}
|
|
break;
|
|
CASE_OP_32_64_VEC(sub):
|
|
{
|
|
TCGOpcode neg_op;
|
|
bool have_neg;
|
|
|
|
if (arg_is_const(op->args[2])) {
|
|
/* Proceed with possible constant folding. */
|
|
break;
|
|
}
|
|
if (opc == INDEX_op_sub_i32) {
|
|
neg_op = INDEX_op_neg_i32;
|
|
have_neg = TCG_TARGET_HAS_neg_i32;
|
|
} else if (opc == INDEX_op_sub_i64) {
|
|
neg_op = INDEX_op_neg_i64;
|
|
have_neg = TCG_TARGET_HAS_neg_i64;
|
|
} else {
|
|
neg_op = INDEX_op_neg_vec;
|
|
have_neg = TCG_TARGET_HAS_neg_vec;
|
|
}
|
|
if (!have_neg) {
|
|
break;
|
|
}
|
|
if (arg_is_const(op->args[1])
|
|
&& arg_info(op->args[1])->val == 0) {
|
|
op->opc = neg_op;
|
|
reset_temp(s, op->args[0]);
|
|
op->args[1] = op->args[2];
|
|
continue;
|
|
}
|
|
}
|
|
break;
|
|
CASE_OP_32_64_VEC(xor):
|
|
CASE_OP_32_64(nand):
|
|
if (!arg_is_const(op->args[1])
|
|
&& arg_is_const(op->args[2])
|
|
&& arg_info(op->args[2])->val == -1) {
|
|
i = 1;
|
|
goto try_not;
|
|
}
|
|
break;
|
|
CASE_OP_32_64(nor):
|
|
if (!arg_is_const(op->args[1])
|
|
&& arg_is_const(op->args[2])
|
|
&& arg_info(op->args[2])->val == 0) {
|
|
i = 1;
|
|
goto try_not;
|
|
}
|
|
break;
|
|
CASE_OP_32_64_VEC(andc):
|
|
if (!arg_is_const(op->args[2])
|
|
&& arg_is_const(op->args[1])
|
|
&& arg_info(op->args[1])->val == -1) {
|
|
i = 2;
|
|
goto try_not;
|
|
}
|
|
break;
|
|
CASE_OP_32_64_VEC(orc):
|
|
CASE_OP_32_64(eqv):
|
|
if (!arg_is_const(op->args[2])
|
|
&& arg_is_const(op->args[1])
|
|
&& arg_info(op->args[1])->val == 0) {
|
|
i = 2;
|
|
goto try_not;
|
|
}
|
|
break;
|
|
try_not:
|
|
{
|
|
TCGOpcode not_op;
|
|
bool have_not;
|
|
|
|
if (def->flags & TCG_OPF_VECTOR) {
|
|
not_op = INDEX_op_not_vec;
|
|
have_not = TCG_TARGET_HAS_not_vec;
|
|
} else if (def->flags & TCG_OPF_64BIT) {
|
|
not_op = INDEX_op_not_i64;
|
|
have_not = TCG_TARGET_HAS_not_i64;
|
|
} else {
|
|
not_op = INDEX_op_not_i32;
|
|
have_not = TCG_TARGET_HAS_not_i32;
|
|
}
|
|
if (!have_not) {
|
|
break;
|
|
}
|
|
op->opc = not_op;
|
|
reset_temp(s, op->args[0]);
|
|
op->args[1] = op->args[i];
|
|
continue;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* Simplify expression for "op r, a, const => mov r, a" cases */
|
|
switch (opc) {
|
|
CASE_OP_32_64_VEC(add):
|
|
CASE_OP_32_64_VEC(sub):
|
|
CASE_OP_32_64_VEC(or):
|
|
CASE_OP_32_64_VEC(xor):
|
|
CASE_OP_32_64_VEC(andc):
|
|
CASE_OP_32_64(shl):
|
|
CASE_OP_32_64(shr):
|
|
CASE_OP_32_64(sar):
|
|
CASE_OP_32_64(rotl):
|
|
CASE_OP_32_64(rotr):
|
|
if (!arg_is_const(op->args[1])
|
|
&& arg_is_const(op->args[2])
|
|
&& arg_info(op->args[2])->val == 0) {
|
|
tcg_opt_gen_mov(s, op, op->args[0], op->args[1]);
|
|
continue;
|
|
}
|
|
break;
|
|
CASE_OP_32_64_VEC(and):
|
|
CASE_OP_32_64_VEC(orc):
|
|
CASE_OP_32_64(eqv):
|
|
if (!arg_is_const(op->args[1])
|
|
&& arg_is_const(op->args[2])
|
|
&& arg_info(op->args[2])->val == -1) {
|
|
tcg_opt_gen_mov(s, op, op->args[0], op->args[1]);
|
|
continue;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* Simplify using known-zero bits. Currently only ops with a single
|
|
output argument is supported. */
|
|
mask = -1;
|
|
affected = -1;
|
|
switch (opc) {
|
|
CASE_OP_32_64(ext8s):
|
|
if ((arg_info(op->args[1])->mask & 0x80) != 0) {
|
|
break;
|
|
}
|
|
CASE_OP_32_64(ext8u):
|
|
mask = 0xff;
|
|
goto and_const;
|
|
CASE_OP_32_64(ext16s):
|
|
if ((arg_info(op->args[1])->mask & 0x8000) != 0) {
|
|
break;
|
|
}
|
|
CASE_OP_32_64(ext16u):
|
|
mask = 0xffff;
|
|
goto and_const;
|
|
case INDEX_op_ext32s_i64:
|
|
if ((arg_info(op->args[1])->mask & 0x80000000) != 0) {
|
|
break;
|
|
}
|
|
case INDEX_op_ext32u_i64:
|
|
mask = 0xffffffffU;
|
|
goto and_const;
|
|
|
|
CASE_OP_32_64(and):
|
|
mask = arg_info(op->args[2])->mask;
|
|
if (arg_is_const(op->args[2])) {
|
|
and_const:
|
|
affected = arg_info(op->args[1])->mask & ~mask;
|
|
}
|
|
mask = arg_info(op->args[1])->mask & mask;
|
|
break;
|
|
|
|
case INDEX_op_ext_i32_i64:
|
|
if ((arg_info(op->args[1])->mask & 0x80000000) != 0) {
|
|
break;
|
|
}
|
|
case INDEX_op_extu_i32_i64:
|
|
/* We do not compute affected as it is a size changing op. */
|
|
mask = (uint32_t)arg_info(op->args[1])->mask;
|
|
break;
|
|
|
|
CASE_OP_32_64(andc):
|
|
/* Known-zeros does not imply known-ones. Therefore unless
|
|
op->args[2] is constant, we can't infer anything from it. */
|
|
if (arg_is_const(op->args[2])) {
|
|
mask = ~arg_info(op->args[2])->mask;
|
|
goto and_const;
|
|
}
|
|
/* But we certainly know nothing outside args[1] may be set. */
|
|
mask = arg_info(op->args[1])->mask;
|
|
break;
|
|
|
|
case INDEX_op_sar_i32:
|
|
if (arg_is_const(op->args[2])) {
|
|
tmp = arg_info(op->args[2])->val & 31;
|
|
mask = (int32_t)arg_info(op->args[1])->mask >> tmp;
|
|
}
|
|
break;
|
|
case INDEX_op_sar_i64:
|
|
if (arg_is_const(op->args[2])) {
|
|
tmp = arg_info(op->args[2])->val & 63;
|
|
mask = (int64_t)arg_info(op->args[1])->mask >> tmp;
|
|
}
|
|
break;
|
|
|
|
case INDEX_op_shr_i32:
|
|
if (arg_is_const(op->args[2])) {
|
|
tmp = arg_info(op->args[2])->val & 31;
|
|
mask = (uint32_t)arg_info(op->args[1])->mask >> tmp;
|
|
}
|
|
break;
|
|
case INDEX_op_shr_i64:
|
|
if (arg_is_const(op->args[2])) {
|
|
tmp = arg_info(op->args[2])->val & 63;
|
|
mask = (uint64_t)arg_info(op->args[1])->mask >> tmp;
|
|
}
|
|
break;
|
|
|
|
case INDEX_op_extrl_i64_i32:
|
|
mask = (uint32_t)arg_info(op->args[1])->mask;
|
|
break;
|
|
case INDEX_op_extrh_i64_i32:
|
|
mask = (uint64_t)arg_info(op->args[1])->mask >> 32;
|
|
break;
|
|
|
|
CASE_OP_32_64(shl):
|
|
if (arg_is_const(op->args[2])) {
|
|
tmp = arg_info(op->args[2])->val & (TCG_TARGET_REG_BITS - 1);
|
|
mask = arg_info(op->args[1])->mask << tmp;
|
|
}
|
|
break;
|
|
|
|
CASE_OP_32_64(neg):
|
|
/* Set to 1 all bits to the left of the rightmost. */
|
|
mask = -(arg_info(op->args[1])->mask
|
|
& -arg_info(op->args[1])->mask);
|
|
break;
|
|
|
|
CASE_OP_32_64(deposit):
|
|
mask = deposit64(arg_info(op->args[1])->mask,
|
|
op->args[3], op->args[4],
|
|
arg_info(op->args[2])->mask);
|
|
break;
|
|
|
|
CASE_OP_32_64(extract):
|
|
mask = extract64(arg_info(op->args[1])->mask,
|
|
op->args[2], op->args[3]);
|
|
if (op->args[2] == 0) {
|
|
affected = arg_info(op->args[1])->mask & ~mask;
|
|
}
|
|
break;
|
|
CASE_OP_32_64(sextract):
|
|
mask = sextract64(arg_info(op->args[1])->mask,
|
|
op->args[2], op->args[3]);
|
|
if (op->args[2] == 0 && (tcg_target_long)mask >= 0) {
|
|
affected = arg_info(op->args[1])->mask & ~mask;
|
|
}
|
|
break;
|
|
|
|
CASE_OP_32_64(or):
|
|
CASE_OP_32_64(xor):
|
|
mask = arg_info(op->args[1])->mask | arg_info(op->args[2])->mask;
|
|
break;
|
|
|
|
case INDEX_op_clz_i32:
|
|
case INDEX_op_ctz_i32:
|
|
mask = arg_info(op->args[2])->mask | 31;
|
|
break;
|
|
|
|
case INDEX_op_clz_i64:
|
|
case INDEX_op_ctz_i64:
|
|
mask = arg_info(op->args[2])->mask | 63;
|
|
break;
|
|
|
|
case INDEX_op_ctpop_i32:
|
|
mask = 32 | 31;
|
|
break;
|
|
case INDEX_op_ctpop_i64:
|
|
mask = 64 | 63;
|
|
break;
|
|
|
|
CASE_OP_32_64(setcond):
|
|
case INDEX_op_setcond2_i32:
|
|
mask = 1;
|
|
break;
|
|
|
|
CASE_OP_32_64(movcond):
|
|
mask = arg_info(op->args[3])->mask | arg_info(op->args[4])->mask;
|
|
break;
|
|
|
|
CASE_OP_32_64(ld8u):
|
|
mask = 0xff;
|
|
break;
|
|
CASE_OP_32_64(ld16u):
|
|
mask = 0xffff;
|
|
break;
|
|
case INDEX_op_ld32u_i64:
|
|
mask = 0xffffffffu;
|
|
break;
|
|
|
|
CASE_OP_32_64(qemu_ld):
|
|
{
|
|
TCGMemOpIdx oi = op->args[nb_oargs + nb_iargs];
|
|
TCGMemOp mop = get_memop(oi);
|
|
if (!(mop & MO_SIGN)) {
|
|
mask = (2ULL << ((8 << (mop & MO_SIZE)) - 1)) - 1;
|
|
}
|
|
}
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* 32-bit ops generate 32-bit results. For the result is zero test
|
|
below, we can ignore high bits, but for further optimizations we
|
|
need to record that the high bits contain garbage. */
|
|
partmask = mask;
|
|
if (!(def->flags & TCG_OPF_64BIT)) {
|
|
mask |= ~(tcg_target_ulong)0xffffffffu;
|
|
partmask &= 0xffffffffu;
|
|
affected &= 0xffffffffu;
|
|
}
|
|
|
|
if (partmask == 0) {
|
|
tcg_debug_assert(nb_oargs == 1);
|
|
tcg_opt_gen_movi(s, op, op->args[0], 0);
|
|
continue;
|
|
}
|
|
if (affected == 0) {
|
|
tcg_debug_assert(nb_oargs == 1);
|
|
tcg_opt_gen_mov(s, op, op->args[0], op->args[1]);
|
|
continue;
|
|
}
|
|
|
|
/* Simplify expression for "op r, a, 0 => movi r, 0" cases */
|
|
switch (opc) {
|
|
CASE_OP_32_64_VEC(and):
|
|
CASE_OP_32_64_VEC(mul):
|
|
CASE_OP_32_64(muluh):
|
|
CASE_OP_32_64(mulsh):
|
|
if (arg_is_const(op->args[2])
|
|
&& arg_info(op->args[2])->val == 0) {
|
|
tcg_opt_gen_movi(s, op, op->args[0], 0);
|
|
continue;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* Simplify expression for "op r, a, a => mov r, a" cases */
|
|
switch (opc) {
|
|
CASE_OP_32_64_VEC(or):
|
|
CASE_OP_32_64_VEC(and):
|
|
if (args_are_copies(op->args[1], op->args[2])) {
|
|
tcg_opt_gen_mov(s, op, op->args[0], op->args[1]);
|
|
continue;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* Simplify expression for "op r, a, a => movi r, 0" cases */
|
|
switch (opc) {
|
|
CASE_OP_32_64_VEC(andc):
|
|
CASE_OP_32_64_VEC(sub):
|
|
CASE_OP_32_64_VEC(xor):
|
|
if (args_are_copies(op->args[1], op->args[2])) {
|
|
tcg_opt_gen_movi(s, op, op->args[0], 0);
|
|
continue;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* Propagate constants through copy operations and do constant
|
|
folding. Constants will be substituted to arguments by register
|
|
allocator where needed and possible. Also detect copies. */
|
|
switch (opc) {
|
|
CASE_OP_32_64_VEC(mov):
|
|
tcg_opt_gen_mov(s, op, op->args[0], op->args[1]);
|
|
break;
|
|
CASE_OP_32_64(movi):
|
|
case INDEX_op_dupi_vec:
|
|
tcg_opt_gen_movi(s, op, op->args[0], op->args[1]);
|
|
break;
|
|
|
|
case INDEX_op_dup_vec:
|
|
if (arg_is_const(op->args[1])) {
|
|
tmp = arg_info(op->args[1])->val;
|
|
tmp = dup_const(TCGOP_VECE(op), tmp);
|
|
tcg_opt_gen_movi(s, op, op->args[0], tmp);
|
|
continue;
|
|
}
|
|
break;
|
|
|
|
CASE_OP_32_64(not):
|
|
CASE_OP_32_64(neg):
|
|
CASE_OP_32_64(ext8s):
|
|
CASE_OP_32_64(ext8u):
|
|
CASE_OP_32_64(ext16s):
|
|
CASE_OP_32_64(ext16u):
|
|
CASE_OP_32_64(ctpop):
|
|
case INDEX_op_ext32s_i64:
|
|
case INDEX_op_ext32u_i64:
|
|
case INDEX_op_ext_i32_i64:
|
|
case INDEX_op_extu_i32_i64:
|
|
case INDEX_op_extrl_i64_i32:
|
|
case INDEX_op_extrh_i64_i32:
|
|
if (arg_is_const(op->args[1])) {
|
|
tmp = do_constant_folding(s, opc, arg_info(op->args[1])->val, 0);
|
|
tcg_opt_gen_movi(s, op, op->args[0], tmp);
|
|
break;
|
|
}
|
|
goto do_default;
|
|
|
|
CASE_OP_32_64(add):
|
|
CASE_OP_32_64(sub):
|
|
CASE_OP_32_64(mul):
|
|
CASE_OP_32_64(or):
|
|
CASE_OP_32_64(and):
|
|
CASE_OP_32_64(xor):
|
|
CASE_OP_32_64(shl):
|
|
CASE_OP_32_64(shr):
|
|
CASE_OP_32_64(sar):
|
|
CASE_OP_32_64(rotl):
|
|
CASE_OP_32_64(rotr):
|
|
CASE_OP_32_64(andc):
|
|
CASE_OP_32_64(orc):
|
|
CASE_OP_32_64(eqv):
|
|
CASE_OP_32_64(nand):
|
|
CASE_OP_32_64(nor):
|
|
CASE_OP_32_64(muluh):
|
|
CASE_OP_32_64(mulsh):
|
|
CASE_OP_32_64(div):
|
|
CASE_OP_32_64(divu):
|
|
CASE_OP_32_64(rem):
|
|
CASE_OP_32_64(remu):
|
|
if (arg_is_const(op->args[1]) && arg_is_const(op->args[2])) {
|
|
tmp = do_constant_folding(s, opc, arg_info(op->args[1])->val,
|
|
arg_info(op->args[2])->val);
|
|
tcg_opt_gen_movi(s, op, op->args[0], tmp);
|
|
break;
|
|
}
|
|
goto do_default;
|
|
|
|
CASE_OP_32_64(clz):
|
|
CASE_OP_32_64(ctz):
|
|
if (arg_is_const(op->args[1])) {
|
|
TCGArg v = arg_info(op->args[1])->val;
|
|
if (v != 0) {
|
|
tmp = do_constant_folding(s, opc, v, 0);
|
|
tcg_opt_gen_movi(s, op, op->args[0], tmp);
|
|
} else {
|
|
tcg_opt_gen_mov(s, op, op->args[0], op->args[2]);
|
|
}
|
|
break;
|
|
}
|
|
goto do_default;
|
|
|
|
CASE_OP_32_64(deposit):
|
|
if (arg_is_const(op->args[1]) && arg_is_const(op->args[2])) {
|
|
tmp = deposit64(arg_info(op->args[1])->val,
|
|
op->args[3], op->args[4],
|
|
arg_info(op->args[2])->val);
|
|
tcg_opt_gen_movi(s, op, op->args[0], tmp);
|
|
break;
|
|
}
|
|
goto do_default;
|
|
|
|
CASE_OP_32_64(extract):
|
|
if (arg_is_const(op->args[1])) {
|
|
tmp = extract64(arg_info(op->args[1])->val,
|
|
op->args[2], op->args[3]);
|
|
tcg_opt_gen_movi(s, op, op->args[0], tmp);
|
|
break;
|
|
}
|
|
goto do_default;
|
|
|
|
CASE_OP_32_64(sextract):
|
|
if (arg_is_const(op->args[1])) {
|
|
tmp = sextract64(arg_info(op->args[1])->val,
|
|
op->args[2], op->args[3]);
|
|
tcg_opt_gen_movi(s, op, op->args[0], tmp);
|
|
break;
|
|
}
|
|
goto do_default;
|
|
|
|
CASE_OP_32_64(setcond):
|
|
tmp = do_constant_folding_cond(s, opc, op->args[1],
|
|
op->args[2], op->args[3]);
|
|
if (tmp != 2) {
|
|
tcg_opt_gen_movi(s, op, op->args[0], tmp);
|
|
break;
|
|
}
|
|
goto do_default;
|
|
|
|
CASE_OP_32_64(brcond):
|
|
tmp = do_constant_folding_cond(s, opc, op->args[0],
|
|
op->args[1], op->args[2]);
|
|
if (tmp != 2) {
|
|
if (tmp) {
|
|
reset_all_temps(s, nb_temps);
|
|
op->opc = INDEX_op_br;
|
|
op->args[0] = op->args[3];
|
|
} else {
|
|
tcg_op_remove(s, op);
|
|
}
|
|
break;
|
|
}
|
|
goto do_default;
|
|
|
|
CASE_OP_32_64(movcond):
|
|
tmp = do_constant_folding_cond(s, opc, op->args[1],
|
|
op->args[2], op->args[5]);
|
|
if (tmp != 2) {
|
|
tcg_opt_gen_mov(s, op, op->args[0], op->args[4-tmp]);
|
|
break;
|
|
}
|
|
if (arg_is_const(op->args[3]) && arg_is_const(op->args[4])) {
|
|
tcg_target_ulong tv = arg_info(op->args[3])->val;
|
|
tcg_target_ulong fv = arg_info(op->args[4])->val;
|
|
TCGCond cond = op->args[5];
|
|
if (fv == 1 && tv == 0) {
|
|
cond = tcg_invert_cond(cond);
|
|
} else if (!(tv == 1 && fv == 0)) {
|
|
goto do_default;
|
|
}
|
|
op->args[3] = cond;
|
|
op->opc = opc = (opc == INDEX_op_movcond_i32
|
|
? INDEX_op_setcond_i32
|
|
: INDEX_op_setcond_i64);
|
|
nb_iargs = 2;
|
|
}
|
|
goto do_default;
|
|
|
|
case INDEX_op_add2_i32:
|
|
case INDEX_op_sub2_i32:
|
|
if (arg_is_const(op->args[2]) && arg_is_const(op->args[3])
|
|
&& arg_is_const(op->args[4]) && arg_is_const(op->args[5])) {
|
|
uint32_t al = arg_info(op->args[2])->val;
|
|
uint32_t ah = arg_info(op->args[3])->val;
|
|
uint32_t bl = arg_info(op->args[4])->val;
|
|
uint32_t bh = arg_info(op->args[5])->val;
|
|
uint64_t a = ((uint64_t)ah << 32) | al;
|
|
uint64_t b = ((uint64_t)bh << 32) | bl;
|
|
TCGArg rl, rh;
|
|
TCGOp *op2 = tcg_op_insert_before(s, op, INDEX_op_movi_i32, 2);
|
|
|
|
if (opc == INDEX_op_add2_i32) {
|
|
a += b;
|
|
} else {
|
|
a -= b;
|
|
}
|
|
|
|
rl = op->args[0];
|
|
rh = op->args[1];
|
|
tcg_opt_gen_movi(s, op, rl, (int32_t)a);
|
|
tcg_opt_gen_movi(s, op2, rh, (int32_t)(a >> 32));
|
|
break;
|
|
}
|
|
goto do_default;
|
|
|
|
case INDEX_op_mulu2_i32:
|
|
if (arg_is_const(op->args[2]) && arg_is_const(op->args[3])) {
|
|
uint32_t a = arg_info(op->args[2])->val;
|
|
uint32_t b = arg_info(op->args[3])->val;
|
|
uint64_t r = (uint64_t)a * b;
|
|
TCGArg rl, rh;
|
|
TCGOp *op2 = tcg_op_insert_before(s, op, INDEX_op_movi_i32, 2);
|
|
|
|
rl = op->args[0];
|
|
rh = op->args[1];
|
|
tcg_opt_gen_movi(s, op, rl, (int32_t)r);
|
|
tcg_opt_gen_movi(s, op2, rh, (int32_t)(r >> 32));
|
|
break;
|
|
}
|
|
goto do_default;
|
|
|
|
case INDEX_op_brcond2_i32:
|
|
tmp = do_constant_folding_cond2(s, &op->args[0], &op->args[2],
|
|
op->args[4]);
|
|
if (tmp != 2) {
|
|
if (tmp) {
|
|
do_brcond_true:
|
|
reset_all_temps(s, nb_temps);
|
|
op->opc = INDEX_op_br;
|
|
op->args[0] = op->args[5];
|
|
} else {
|
|
do_brcond_false:
|
|
tcg_op_remove(s, op);
|
|
}
|
|
} else if ((op->args[4] == TCG_COND_LT
|
|
|| op->args[4] == TCG_COND_GE)
|
|
&& arg_is_const(op->args[2])
|
|
&& arg_info(op->args[2])->val == 0
|
|
&& arg_is_const(op->args[3])
|
|
&& arg_info(op->args[3])->val == 0) {
|
|
/* Simplify LT/GE comparisons vs zero to a single compare
|
|
vs the high word of the input. */
|
|
do_brcond_high:
|
|
reset_all_temps(s, nb_temps);
|
|
op->opc = INDEX_op_brcond_i32;
|
|
op->args[0] = op->args[1];
|
|
op->args[1] = op->args[3];
|
|
op->args[2] = op->args[4];
|
|
op->args[3] = op->args[5];
|
|
} else if (op->args[4] == TCG_COND_EQ) {
|
|
/* Simplify EQ comparisons where one of the pairs
|
|
can be simplified. */
|
|
tmp = do_constant_folding_cond(s, INDEX_op_brcond_i32,
|
|
op->args[0], op->args[2],
|
|
TCG_COND_EQ);
|
|
if (tmp == 0) {
|
|
goto do_brcond_false;
|
|
} else if (tmp == 1) {
|
|
goto do_brcond_high;
|
|
}
|
|
tmp = do_constant_folding_cond(s, INDEX_op_brcond_i32,
|
|
op->args[1], op->args[3],
|
|
TCG_COND_EQ);
|
|
if (tmp == 0) {
|
|
goto do_brcond_false;
|
|
} else if (tmp != 1) {
|
|
goto do_default;
|
|
}
|
|
do_brcond_low:
|
|
reset_all_temps(s, nb_temps);
|
|
op->opc = INDEX_op_brcond_i32;
|
|
op->args[1] = op->args[2];
|
|
op->args[2] = op->args[4];
|
|
op->args[3] = op->args[5];
|
|
} else if (op->args[4] == TCG_COND_NE) {
|
|
/* Simplify NE comparisons where one of the pairs
|
|
can be simplified. */
|
|
tmp = do_constant_folding_cond(s, INDEX_op_brcond_i32,
|
|
op->args[0], op->args[2],
|
|
TCG_COND_NE);
|
|
if (tmp == 0) {
|
|
goto do_brcond_high;
|
|
} else if (tmp == 1) {
|
|
goto do_brcond_true;
|
|
}
|
|
tmp = do_constant_folding_cond(s, INDEX_op_brcond_i32,
|
|
op->args[1], op->args[3],
|
|
TCG_COND_NE);
|
|
if (tmp == 0) {
|
|
goto do_brcond_low;
|
|
} else if (tmp == 1) {
|
|
goto do_brcond_true;
|
|
}
|
|
goto do_default;
|
|
} else {
|
|
goto do_default;
|
|
}
|
|
break;
|
|
|
|
case INDEX_op_setcond2_i32:
|
|
tmp = do_constant_folding_cond2(s, &op->args[1], &op->args[3],
|
|
op->args[5]);
|
|
if (tmp != 2) {
|
|
do_setcond_const:
|
|
tcg_opt_gen_movi(s, op, op->args[0], tmp);
|
|
} else if ((op->args[5] == TCG_COND_LT
|
|
|| op->args[5] == TCG_COND_GE)
|
|
&& arg_is_const(op->args[3])
|
|
&& arg_info(op->args[3])->val == 0
|
|
&& arg_is_const(op->args[4])
|
|
&& arg_info(op->args[4])->val == 0) {
|
|
/* Simplify LT/GE comparisons vs zero to a single compare
|
|
vs the high word of the input. */
|
|
do_setcond_high:
|
|
reset_temp(s, op->args[0]);
|
|
arg_info(op->args[0])->mask = 1;
|
|
op->opc = INDEX_op_setcond_i32;
|
|
op->args[1] = op->args[2];
|
|
op->args[2] = op->args[4];
|
|
op->args[3] = op->args[5];
|
|
} else if (op->args[5] == TCG_COND_EQ) {
|
|
/* Simplify EQ comparisons where one of the pairs
|
|
can be simplified. */
|
|
tmp = do_constant_folding_cond(s, INDEX_op_setcond_i32,
|
|
op->args[1], op->args[3],
|
|
TCG_COND_EQ);
|
|
if (tmp == 0) {
|
|
goto do_setcond_const;
|
|
} else if (tmp == 1) {
|
|
goto do_setcond_high;
|
|
}
|
|
tmp = do_constant_folding_cond(s, INDEX_op_setcond_i32,
|
|
op->args[2], op->args[4],
|
|
TCG_COND_EQ);
|
|
if (tmp == 0) {
|
|
goto do_setcond_high;
|
|
} else if (tmp != 1) {
|
|
goto do_default;
|
|
}
|
|
do_setcond_low:
|
|
reset_temp(s, op->args[0]);
|
|
arg_info(op->args[0])->mask = 1;
|
|
op->opc = INDEX_op_setcond_i32;
|
|
op->args[2] = op->args[3];
|
|
op->args[3] = op->args[5];
|
|
} else if (op->args[5] == TCG_COND_NE) {
|
|
/* Simplify NE comparisons where one of the pairs
|
|
can be simplified. */
|
|
tmp = do_constant_folding_cond(s, INDEX_op_setcond_i32,
|
|
op->args[1], op->args[3],
|
|
TCG_COND_NE);
|
|
if (tmp == 0) {
|
|
goto do_setcond_high;
|
|
} else if (tmp == 1) {
|
|
goto do_setcond_const;
|
|
}
|
|
tmp = do_constant_folding_cond(s, INDEX_op_setcond_i32,
|
|
op->args[2], op->args[4],
|
|
TCG_COND_NE);
|
|
if (tmp == 0) {
|
|
goto do_setcond_low;
|
|
} else if (tmp == 1) {
|
|
goto do_setcond_const;
|
|
}
|
|
goto do_default;
|
|
} else {
|
|
goto do_default;
|
|
}
|
|
break;
|
|
|
|
case INDEX_op_call:
|
|
if (!(op->args[nb_oargs + nb_iargs + 1]
|
|
& (TCG_CALL_NO_READ_GLOBALS | TCG_CALL_NO_WRITE_GLOBALS))) {
|
|
for (i = 0; i < nb_globals; i++) {
|
|
if (test_bit(i, s->temps2_used.l)) {
|
|
reset_ts(&s->temps[i]);
|
|
}
|
|
}
|
|
}
|
|
goto do_reset_output;
|
|
|
|
default:
|
|
do_default:
|
|
/* Default case: we know nothing about operation (or were unable
|
|
to compute the operation result) so no propagation is done.
|
|
We trash everything if the operation is the end of a basic
|
|
block, otherwise we only trash the output args. "mask" is
|
|
the non-zero bits mask for the first output arg. */
|
|
if (def->flags & TCG_OPF_BB_END) {
|
|
reset_all_temps(s, nb_temps);
|
|
} else {
|
|
do_reset_output:
|
|
for (i = 0; i < nb_oargs; i++) {
|
|
reset_temp(s, op->args[i]);
|
|
/* Save the corresponding known-zero bits mask for the
|
|
first output argument (only one supported so far). */
|
|
if (i == 0) {
|
|
arg_info(op->args[i])->mask = mask;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* Eliminate duplicate and redundant fence instructions. */
|
|
if (prev_mb) {
|
|
switch (opc) {
|
|
case INDEX_op_mb:
|
|
/* Merge two barriers of the same type into one,
|
|
* or a weaker barrier into a stronger one,
|
|
* or two weaker barriers into a stronger one.
|
|
* mb X; mb Y => mb X|Y
|
|
* mb; strl => mb; st
|
|
* ldaq; mb => ld; mb
|
|
* ldaq; strl => ld; mb; st
|
|
* Other combinations are also merged into a strong
|
|
* barrier. This is stricter than specified but for
|
|
* the purposes of TCG is better than not optimizing.
|
|
*/
|
|
prev_mb->args[0] |= op->args[0];
|
|
tcg_op_remove(s, op);
|
|
break;
|
|
|
|
default:
|
|
/* Opcodes that end the block stop the optimization. */
|
|
if ((def->flags & TCG_OPF_BB_END) == 0) {
|
|
break;
|
|
}
|
|
/* fallthru */
|
|
case INDEX_op_qemu_ld_i32:
|
|
case INDEX_op_qemu_ld_i64:
|
|
case INDEX_op_qemu_st_i32:
|
|
case INDEX_op_qemu_st_i64:
|
|
case INDEX_op_call:
|
|
/* Opcodes that touch guest memory stop the optimization. */
|
|
prev_mb = NULL;
|
|
break;
|
|
}
|
|
} else if (opc == INDEX_op_mb) {
|
|
prev_mb = op;
|
|
}
|
|
}
|
|
}
|