yuzu/unicorn
1
0
Fork 0
mirror of https://github.com/yuzu-emu/unicorn.git synced 2025-02-25 18:06:56 +00:00
Code Issues Packages Projects Releases Wiki Activity

tcg/i386: Always use TZCNT when available

Browse source 
I think this is cleaner than sometimes using BSF.

Backports commit 39f099ec9d6d420b6fe6f7f4f8ed80ae29c65ff2 from qemu
This commit is contained in:
Richard Henderson 2018-03-12 05:11:27 -04:00 committed by Lioncash
parent 8e161bb723
commit a16ee979fc
No known key found for this signature in database
GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 7 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
qemu/tcg/i386/tcg-target.inc.c
View file

@ -1498,10 +1498,14 @@ static void tcg_out_movcond64(TCGContext *s, TCGCond cond, TCGReg dest,
static void tcg_out_ctz(TCGContext *s, int rexw, TCGReg dest, TCGReg arg1,
TCGArg arg2, bool const_a2)
{
if (const_a2) {
tcg_debug_assert(have_bmi1);
tcg_debug_assert(arg2 == (rexw ? 64 : 32));
if (have_bmi1) {
tcg_out_modrm(s, OPC_TZCNT + rexw, dest, arg1);
if (const_a2) {
tcg_debug_assert(arg2 == (rexw ? 64 : 32));
} else {
tcg_debug_assert(dest != arg2);
tcg_out_cmov(s, TCG_COND_LTU, rexw, dest, arg2);
}
} else {
tcg_debug_assert(dest != arg2);
tcg_out_modrm(s, OPC_BSF + rexw, dest, arg1);