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tcg/optimize: Fold movcond 0/1 into setcond

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Backports commit 333b21b809fc80ce67c8f6a7d1c7cc66437d9791 from qemu
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Richard Henderson 2018-03-01 14:40:49 -05:00 committed by Lioncash
parent b62743947f
commit 199b3859c4
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 15 additions and 0 deletions
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15
qemu/tcg/optimize.c
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@ -1116,6 +1116,21 @@ void tcg_optimize(TCGContext *s)
tcg_opt_gen_mov(s, op, args, args[0], args[4-tmp]); tcg_opt_gen_mov(s, op, args, args[0], args[4-tmp]);
break; break;
} }
if (temp_is_const(s, args[3]) && temp_is_const(s, args[4])) {
tcg_target_ulong tv = temps[args[3]].val;
tcg_target_ulong fv = temps[args[4]].val;
TCGCond cond = args[5];
if (fv == 1 && tv == 0) {
cond = tcg_invert_cond(cond);
} else if (!(tv == 1 && fv == 0)) {
goto do_default;
}
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; goto do_default;
case INDEX_op_add2_i32: case INDEX_op_add2_i32: