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JitArm64: Optimize frsqrte denormal path 

Now that the normal path is no longer reading X2 and X3, it doesn't
matter what the denormal path writes to them.
This commit is contained in:
JosJuice 2023-10-11 19:38:46 +02:00
parent e5bd8019f6
commit 4b2f73774f
1 changed files with 4 additions and 5 deletions
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9
Source/Core/Core/PowerPC/JitArm64/JitAsm.cpp
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@ -333,11 +333,10 @@ void JitArm64::GenerateFrsqrte()
// "Normalize" denormal values
CLZ(ARM64Reg::X3, ARM64Reg::X3);
SUB(ARM64Reg::X4, ARM64Reg::X3, 11);
MOVI2R(ARM64Reg::X2, 0x00C0'0000'0000'0000);
LSLV(ARM64Reg::X4, ARM64Reg::X1, ARM64Reg::X4);
SUB(ARM64Reg::X2, ARM64Reg::X2, ARM64Reg::X3, ArithOption(ARM64Reg::X3, ShiftType::LSL, 52));
AND(ARM64Reg::X3, ARM64Reg::X4, LogicalImm(Common::DOUBLE_FRAC - 1, 64));
ORR(ARM64Reg::X1, ARM64Reg::X2, ARM64Reg::X3);
MOVI2R(ARM64Reg::X2, 12);
LSLV(ARM64Reg::X1, ARM64Reg::X1, ARM64Reg::X4);
SUB(ARM64Reg::X3, ARM64Reg::X2, ARM64Reg::X3);
BFI(ARM64Reg::X1, ARM64Reg::X3, 52, 12);
SetJumpTarget(normal);
UBFX(ARM64Reg::X2, ARM64Reg::X1, 48, 5);