ShuriZma
/
dolphin
mirror of https://github.com/dolphin-emu/dolphin.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

DSPJitUtil: Make round_long_acc branchless 

Also no longer clobbers RCX.
This commit is contained in:
Sintendo 2019-06-05 23:25:39 +02:00
parent 9b6f2859a4
commit 832e320f08
1 changed files with 3 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
Source/Core/Core/DSP/Jit/x64/DSPJitUtil.cpp
View File

@ -707,22 +707,13 @@ void DSPEmitter::set_long_prod()
}
// Returns s64 in RAX
// Clobbers RCX
void DSPEmitter::round_long_acc(X64Reg long_acc)
{
// if (prod & 0x10000) prod = (prod + 0x8000) & ~0xffff;
TEST(32, R(long_acc), Imm32(0x10000));
FixupBranch jump = J_CC(CC_Z);
ADD(64, R(long_acc), Imm32(0x8000));
MOV(64, R(ECX), Imm64(~0xffff));
AND(64, R(long_acc), R(RCX));
FixupBranch _ret = J();
// else prod = (prod + 0x7fff) & ~0xffff;
SetJumpTarget(jump);
ADD(64, R(long_acc), Imm32(0x7fff));
MOV(64, R(RCX), Imm64(~0xffff));
AND(64, R(long_acc), R(RCX));
SetJumpTarget(_ret);
BT(32, R(long_acc), Imm8(16));
ADC(64, R(long_acc), Imm32(0x7FFF));
XOR(16, R(long_acc), R(long_acc));
// return prod;
}