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Merge pull request #13224 from Sintendo/jitarm64-subfic2 

JitArm64_Integer: Optimize subfic for -1
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JMC47 2024-12-18 12:07:23 -05:00 committed by GitHub
parent 01f6810a9d d81213c4a5
commit ac0d6cbaaa
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GPG Key ID: B5690EEEBB952194
1 changed files with 21 additions and 10 deletions
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31
Source/Core/Core/PowerPC/JitArm64/JitArm64_Integer.cpp
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@ -1394,23 +1394,34 @@ void JitArm64::subfic(UGeckoInstruction inst)
else else
{ {
const bool will_read = d == a; const bool will_read = d == a;
const bool is_zero = imm == 0;
gpr.BindToRegister(d, will_read); gpr.BindToRegister(d, will_read);
// d = imm - a
ARM64Reg RD = gpr.R(d); ARM64Reg RD = gpr.R(d);
if (imm == -1)
{ {
Arm64GPRCache::ScopedARM64Reg WA(ARM64Reg::WZR); // d = -1 - a = ~a
if (!is_zero) MVN(RD, gpr.R(a));
// CA is always set in this case
ComputeCarry(true);
}
else
{
const bool is_zero = imm == 0;
// d = imm - a
{ {
WA = will_read ? gpr.GetScopedReg() : Arm64GPRCache::ScopedARM64Reg(RD); Arm64GPRCache::ScopedARM64Reg WA(ARM64Reg::WZR);
MOVI2R(WA, imm); if (!is_zero)
{
WA = will_read ? gpr.GetScopedReg() : Arm64GPRCache::ScopedARM64Reg(RD);
MOVI2R(WA, imm);
}
CARRY_IF_NEEDED(SUB, SUBS, RD, WA, gpr.R(a));
} }
CARRY_IF_NEEDED(SUB, SUBS, RD, WA, gpr.R(a)); ComputeCarry();
} }
ComputeCarry();
} }
} }