The-Homebrew-Cloud/dolphin
2
0
Fork 0
mirror of https://github.com/dolphin-emu/dolphin.git synced 2025-01-09 15:49:25 +01:00
Code Issues Packages Projects Releases Wiki Activity

Jit64: subfx - Special case a == b

Browse Source 
Soul Calibur II does this.

Before:
2B F6                sub         esi,esi

After:
Nothing!
This commit is contained in:
Sintendo 2021-01-05 00:08:35 +01:00
parent b0be20560f
commit c0be34aa81
1 changed files with 7 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
Source/Core/Core/PowerPC/Jit64/Jit_Integer.cpp
View File

@ -941,7 +941,13 @@ void Jit64::subfx(UGeckoInstruction inst)
JITDISABLE(bJITIntegerOff);
int a = inst.RA, b = inst.RB, d = inst.RD;
if (gpr.IsImm(a) && gpr.IsImm(b))
if (a == b)
{
gpr.SetImmediate32(d, 0);
if (inst.OE)
GenerateConstantOverflow(false);
}
else if (gpr.IsImm(a, b))
{
s32 i = gpr.SImm32(b), j = gpr.SImm32(a);
gpr.SetImmediate32(d, i - j);