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JitArm64: Optimize frsqrte denormal path

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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
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);