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JitArm64: Read X1 in frsqrte normal path

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Instead of combining X2 (the exponent) and X3 (the mantissa) using an
ORR instruction, we can read X1, which already contains both.

This requires us to reconstruct X1 in the denormal path, but that's
an acceptable price.
This commit is contained in:
JosJuice 2023-10-11 18:48:47 +02:00
parent 6b2d801ed7
commit 31d751b6da
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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@ -337,13 +337,12 @@ void JitArm64::GenerateFrsqrte()
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);
SetJumpTarget(normal);
LSR(ARM64Reg::X2, ARM64Reg::X2, 48);
AND(ARM64Reg::X2, ARM64Reg::X2, LogicalImm(0x10, 64));
MOVP2R(ARM64Reg::X1, &Common::frsqrte_expected);
ORR(ARM64Reg::X2, ARM64Reg::X2, ARM64Reg::X3, ArithOption(ARM64Reg::X3, ShiftType::LSR, 48));
ADD(ARM64Reg::X2, ARM64Reg::X1, ARM64Reg::X2, ArithOption(ARM64Reg::X2, ShiftType::LSL, 3));
UBFX(ARM64Reg::X2, ARM64Reg::X1, 48, 5);
MOVP2R(ARM64Reg::X4, &Common::frsqrte_expected);
ADD(ARM64Reg::X2, ARM64Reg::X4, ARM64Reg::X2, ArithOption(ARM64Reg::X2, ShiftType::LSL, 3));
LDP(IndexType::Signed, ARM64Reg::W1, ARM64Reg::W2, ARM64Reg::X2, 0);
UBFX(ARM64Reg::X3, ARM64Reg::X3, 37, 11);
AND(ARM64Reg::X0, ARM64Reg::X0, LogicalImm(Common::DOUBLE_SIGN | Common::DOUBLE_EXP, 64));