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Jit_Integer: Optimize common rlwimix cases

This commit is contained in:
MerryMage 2020-12-28 12:57:53 +00:00
parent 4a102186c7
commit cdcca72b61
1 changed files with 26 additions and 11 deletions
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37
Source/Core/Core/PowerPC/Jit64/Jit_Integer.cpp
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@ -1726,7 +1726,7 @@ void Jit64::rlwimix(UGeckoInstruction inst)
}
else if (inst.SH)
{
// TODO: common cases of this might be faster with pinsrb or abuse of AH
// TODO: perhaps consider pinsrb or abuse of AH
RCOpArg Rs = gpr.Use(s, RCMode::Read);
RCX64Reg Ra = gpr.Bind(a, RCMode::ReadWrite);
RegCache::Realize(Rs, Ra);
@ -1735,22 +1735,28 @@ void Jit64::rlwimix(UGeckoInstruction inst)
{
MOV(32, R(RSCRATCH), Rs);
SHL(32, R(RSCRATCH), Imm8(inst.SH));
AndWithMask(Ra, ~mask);
OR(32, Ra, R(RSCRATCH));
}
else if (right_shift)
{
MOV(32, R(RSCRATCH), Rs);
SHR(32, R(RSCRATCH), Imm8(32 - inst.SH));
AndWithMask(Ra, ~mask);
OR(32, Ra, R(RSCRATCH));
}
else
{
RotateLeft(32, RSCRATCH, Rs, inst.SH);
XOR(32, R(RSCRATCH), Ra);
AndWithMask(RSCRATCH, mask);
XOR(32, Ra, R(RSCRATCH));
}
if (mask == 0xFF || mask == 0xFFFF)
{
MOV(mask == 0xFF ? 8 : 16, Ra, R(RSCRATCH));
needs_test = true;
}
else
{
if (!left_shift && !right_shift)
AndWithMask(RSCRATCH, mask);
AndWithMask(Ra, ~mask);
OR(32, Ra, R(RSCRATCH));
}
}
else
@ -1758,9 +1764,18 @@ void Jit64::rlwimix(UGeckoInstruction inst)
RCX64Reg Rs = gpr.Bind(s, RCMode::Read);
RCX64Reg Ra = gpr.Bind(a, RCMode::ReadWrite);
RegCache::Realize(Rs, Ra);
XOR(32, Ra, Rs);
AndWithMask(Ra, ~mask);
XOR(32, Ra, Rs);
if (mask == 0xFF || mask == 0xFFFF)
{
MOV(mask == 0xFF ? 8 : 16, Ra, Rs);
needs_test = true;
}
else
{
XOR(32, Ra, Rs);
AndWithMask(Ra, ~mask);
XOR(32, Ra, Rs);
}
}
if (inst.Rc)
ComputeRC(a, needs_test);