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Jit64: addx - Skip ADD after MOV when possible 

We can get away with skipping the addition when we know we're dealing
with a constant zero. Just a MOV will suffice in this case.

Once again, we don't bother to add separate handling for when overflow
is needed, because no titles would ever hit that path during my testing.

Before:
8B 7D F8             mov         edi,dword ptr [rbp-8]
83 C7 00             add         edi,0

After:
8B 7D F8             mov         edi,dword ptr [rbp-8]
This commit is contained in:
Sintendo 2020-04-19 23:47:47 +02:00
parent 50f7a7d248
commit 89646c898f
1 changed files with 4 additions and 1 deletions
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5
Source/Core/Core/PowerPC/Jit64/Jit_Integer.cpp
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@ -1365,7 +1365,10 @@ void Jit64::addx(UGeckoInstruction inst)
if (imm >= -128 && imm <= 127) if (imm >= -128 && imm <= 127)
{ {
MOV(32, Rd, Rother); MOV(32, Rd, Rother);
ADD(32, Rd, Rimm); if (imm != 0 || inst.OE)
{
ADD(32, Rd, Rimm);
}
} }
else else
{ {