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Merge pull request #13324 from Sintendo/jitarm64-cmp-imm

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JitArm64_Integer: cmp/cmpl optimizations
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JMC47 2025-02-15 00:30:34 -05:00 committed by GitHub
commit f9accfd4d6
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2 changed files with 55 additions and 6 deletions
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59
Source/Core/Core/PowerPC/JitArm64/JitArm64_Integer.cpp
View File

@ -652,17 +652,58 @@ void JitArm64::cmp(UGeckoInstruction inst)
SXTW(CR, gpr.R(b));
MVN(CR, CR);
}
else if (gpr.IsImm(b) && !gpr.GetImm(b))
else if (gpr.IsImm(b) && (gpr.GetImm(b) & 0xFFF) == gpr.GetImm(b))
{
SXTW(CR, gpr.R(a));
if (const u32 imm = gpr.GetImm(b); imm != 0)
SUB(CR, CR, imm);
}
else if (gpr.IsImm(b) && (gpr.GetImm(b) & 0xFFF000) == gpr.GetImm(b))
{
SXTW(CR, gpr.R(a));
SUB(CR, CR, gpr.GetImm(b) >> 12, true);
}
else if (gpr.IsImm(b) && (((~gpr.GetImm(b) + 1) & 0xFFF) == (~gpr.GetImm(b) + 1)))
{
SXTW(CR, gpr.R(a));
ADD(CR, CR, ~gpr.GetImm(b) + 1);
}
else if (gpr.IsImm(b) && (((~gpr.GetImm(b) + 1) & 0xFFF000) == (~gpr.GetImm(b) + 1)))
{
SXTW(CR, gpr.R(a));
ADD(CR, CR, (~gpr.GetImm(b) + 1) >> 12, true);
}
else
{
// If we're dealing with immediates, check their most significant bit to
// see if we can skip sign extension.
const auto should_sign_extend = [&](u32 reg) -> bool {
return !gpr.IsImm(reg) || (gpr.GetImm(reg) & (1U << 31));
};
bool sign_extend_a = should_sign_extend(a);
bool sign_extend_b = should_sign_extend(b);
ARM64Reg RA = gpr.R(a);
ARM64Reg RB = gpr.R(b);
SXTW(CR, RA);
SUB(CR, CR, RB, ArithOption(RB, ExtendSpecifier::SXTW));
if (sign_extend_a)
{
SXTW(CR, RA);
RA = CR;
}
else
{
RA = EncodeRegTo64(RA);
}
auto opt = ArithOption(RB, ExtendSpecifier::SXTW);
if (!sign_extend_b)
{
opt = ArithOption(CR, ShiftType::LSL, 0);
RB = EncodeRegTo64(RB);
}
SUB(CR, RA, RB, opt);
}
}
@ -687,9 +728,17 @@ void JitArm64::cmpl(UGeckoInstruction inst)
{
NEG(CR, EncodeRegTo64(gpr.R(b)));
}
else if (gpr.IsImm(b) && !gpr.GetImm(b))
else if (gpr.IsImm(b) && (gpr.GetImm(b) & 0xFFF) == gpr.GetImm(b))
{
MOV(EncodeRegTo32(CR), gpr.R(a));
const u32 imm = gpr.GetImm(b);
if (imm == 0)
MOV(EncodeRegTo32(CR), gpr.R(a));
else
SUB(CR, EncodeRegTo64(gpr.R(a)), imm);
}
else if (gpr.IsImm(b) && (gpr.GetImm(b) & 0xFFF000) == gpr.GetImm(b))
{
SUB(CR, EncodeRegTo64(gpr.R(a)), gpr.GetImm(b) >> 12, true);
}
else
{

2
Source/Core/Core/PowerPC/JitArm64/JitArm64_RegCache.h
View File

@ -345,7 +345,7 @@ public:
// Gets the immediate that a register is set to. Only valid for guest GPRs.
u32 GetImm(size_t preg) const { return GetGuestGPROpArg(preg).GetImm(); }
bool IsImm(size_t preg, u32 imm) { return IsImm(preg) && GetImm(preg) == imm; }
bool IsImm(size_t preg, u32 imm) const { return IsImm(preg) && GetImm(preg) == imm; }
// Binds a guest GPR to a host register, optionally loading its value.
//