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Merge pull request #10199 from Sintendo/jit64divwxnits

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Jit64: divwx - One more micro-optimization
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Mai M 2021-11-03 17:10:39 -04:00 committed by GitHub
commit 39ccdc1f98
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1 changed files with 9 additions and 3 deletions
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12
Source/Core/Core/PowerPC/Jit64/Jit_Integer.cpp
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@ -1494,22 +1494,28 @@ void Jit64::divwx(UGeckoInstruction inst)
else if (divisor == 2 || divisor == -2) else if (divisor == 2 || divisor == -2)
{ {
X64Reg tmp = RSCRATCH; X64Reg tmp = RSCRATCH;
X64Reg sign = tmp;
if (!Ra.IsSimpleReg()) if (!Ra.IsSimpleReg())
{ {
// Load dividend from memory
MOV(32, R(tmp), Ra); MOV(32, R(tmp), Ra);
MOV(32, Rd, R(tmp)); MOV(32, Rd, R(tmp));
} }
else if (d == a) else if (d == a)
{ {
// Make a copy of the dividend
MOV(32, R(tmp), Ra); MOV(32, R(tmp), Ra);
} }
else else
{ {
// Copy dividend directly into destination
MOV(32, Rd, Ra); MOV(32, Rd, Ra);
tmp = Ra.GetSimpleReg(); tmp = Ra.GetSimpleReg();
sign = Rd;
} }
SHR(32, Rd, Imm8(31)); SHR(32, R(sign), Imm8(31));
ADD(32, Rd, R(tmp)); ADD(32, Rd, R(tmp));
SAR(32, Rd, Imm8(1)); SAR(32, Rd, Imm8(1));
@ -1538,11 +1544,11 @@ void Jit64::divwx(UGeckoInstruction inst)
else if (d == a) else if (d == a)
{ {
// Rd holds the dividend, while RSCRATCH holds the sum // Rd holds the dividend, while RSCRATCH holds the sum
// This is opposite of the other cases // This is the reverse of the other cases
dividend = Rd; dividend = Rd;
sum = RSCRATCH; sum = RSCRATCH;
src = RSCRATCH; src = RSCRATCH;
// Negate condition to compensate the swapped values // Negate condition to compensate for the swapped values
cond = CC_S; cond = CC_S;
} }
else else