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target/arm: Use pointers in neon tbl helper

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Rather than passing a regno to the helper, pass pointers to the
vector register directly. This eliminates the need to pass in
the environment pointer and reduces the number of places that
directly access env->vfp.regs[].

Backports commit e7c06c4e4c98c47899417f154df1f2ef4e8d09a0 from qemu
This commit is contained in:
Richard Henderson 2018-03-06 10:20:17 -05:00 committed by Lioncash
parent 0bc07dd6be
commit 404fa33c4b
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GPG key ID: 4E3C3CC1031BA9C7
3 changed files with 12 additions and 15 deletions
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2
qemu/target/arm/helper.h
View file

@ -190,7 +190,7 @@ DEF_HELPER_FLAGS_2(rsqrte_f32, TCG_CALL_NO_RWG, f32, f32, ptr)
DEF_HELPER_FLAGS_2(rsqrte_f64, TCG_CALL_NO_RWG, f64, f64, ptr)
DEF_HELPER_2(recpe_u32, i32, i32, ptr)
DEF_HELPER_FLAGS_2(rsqrte_u32, TCG_CALL_NO_RWG, i32, i32, ptr)
DEF_HELPER_5(neon_tbl, i32, env, i32, i32, i32, i32)
DEF_HELPER_FLAGS_4(neon_tbl, TCG_CALL_NO_RWG, i32, i32, i32, ptr, i32)
DEF_HELPER_3(shl_cc, i32, env, i32, i32)
DEF_HELPER_3(shr_cc, i32, env, i32, i32)

17
qemu/target/arm/op_helper.c
View file

@ -53,20 +53,17 @@ static int exception_target_el(CPUARMState *env)
return target_el;
}
uint32_t HELPER(neon_tbl)(CPUARMState *env, uint32_t ireg, uint32_t def,
uint32_t rn, uint32_t maxindex)
uint32_t HELPER(neon_tbl)(uint32_t ireg, uint32_t def, void *vn,
uint32_t maxindex)
{
uint32_t val;
uint32_t tmp;
int index;
int shift;
uint64_t *table;
table = (uint64_t *)&env->vfp.regs[rn];
uint32_t val, shift;
uint64_t *table = vn;
val = 0;
for (shift = 0; shift < 32; shift += 8) {
index = (ireg >> shift) & 0xff;
uint32_t index = (ireg >> shift) & 0xff;
if (index < maxindex) {
tmp = (table[index >> 3] >> ((index & 7) << 3)) & 0xff;
uint32_t tmp = (table[index >> 3] >> ((index & 7) << 3)) & 0xff;
val |= tmp << shift;
} else {
val |= def & (0xff << shift);

8
qemu/target/arm/translate.c
View file

@ -7701,9 +7701,9 @@ static int disas_neon_data_insn(DisasContext *s, uint32_t insn)
tcg_gen_movi_i32(tcg_ctx, tmp, 0);
}
tmp2 = neon_load_reg(tcg_ctx, rm, 0);
tmp4 = tcg_const_i32(tcg_ctx, rn);
ptr1 = vfp_reg_ptr(tcg_ctx, true, rn);
tmp5 = tcg_const_i32(tcg_ctx, n);
gen_helper_neon_tbl(tcg_ctx, tmp2, tcg_ctx->cpu_env, tmp2, tmp, tmp4, tmp5);
gen_helper_neon_tbl(tcg_ctx, tmp2, tmp2, tmp, ptr1, tmp5);
tcg_temp_free_i32(tcg_ctx, tmp);
if (insn & (1 << 6)) {
tmp = neon_load_reg(tcg_ctx, rd, 1);
@ -7712,9 +7712,9 @@ static int disas_neon_data_insn(DisasContext *s, uint32_t insn)
tcg_gen_movi_i32(tcg_ctx, tmp, 0);
}
tmp3 = neon_load_reg(tcg_ctx, rm, 1);
gen_helper_neon_tbl(tcg_ctx, tmp3, tcg_ctx->cpu_env, tmp3, tmp, tmp4, tmp5);
gen_helper_neon_tbl(tcg_ctx, tmp3, tmp3, tmp, ptr1, tmp5);
tcg_temp_free_i32(tcg_ctx, tmp5);
tcg_temp_free_i32(tcg_ctx, tmp4);
tcg_temp_free_ptr(tcg_ctx, ptr1);
neon_store_reg(tcg_ctx, rd, 0, tmp2);
neon_store_reg(tcg_ctx, rd, 1, tmp3);
tcg_temp_free_i32(tcg_ctx, tmp);