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PPCAnalyst: Run cror reordering after cmp reordering 

We would rather have cror be close to the cmp than the branch.
This commit is contained in:
JosJuice 2021-10-16 16:53:05 +02:00
parent 40e0dd93be
commit 96d622bb61
1 changed files with 8 additions and 5 deletions
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13
Source/Core/Core/PowerPC/PPCAnalyst.cpp
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@ -542,11 +542,6 @@ void PPCAnalyzer::ReorderInstructionsCore(u32 instructions, CodeOp* code, bool r
void PPCAnalyzer::ReorderInstructions(u32 instructions, CodeOp* code) const
{
// Reorder cror instructions upwards (e.g. towards an fcmp). Technically we should be more
// picky about this, but cror seems to almost solely be used for this purpose in real code.
// Additionally, the other boolean ops seem to almost never be used.
if (HasOption(OPTION_CROR_MERGE))
ReorderInstructionsCore(instructions, code, true, ReorderType::CROR);
// For carry, bubble instructions *towards* each other; one direction often isn't enough
// to get pairs like addc/adde next to each other.
if (HasOption(OPTION_CARRY_MERGE))
@ -554,8 +549,16 @@ void PPCAnalyzer::ReorderInstructions(u32 instructions, CodeOp* code) const
ReorderInstructionsCore(instructions, code, false, ReorderType::Carry);
ReorderInstructionsCore(instructions, code, true, ReorderType::Carry);
}
// Reorder instructions which write to CR (typically compare instructions) towards branches.
if (HasOption(OPTION_BRANCH_MERGE))
ReorderInstructionsCore(instructions, code, false, ReorderType::CMP);
// Reorder cror instructions upwards (e.g. towards an fcmp). Technically we should be more
// picky about this, but cror seems to almost solely be used for this purpose in real code.
// Additionally, the other boolean ops seem to almost never be used.
if (HasOption(OPTION_CROR_MERGE))
ReorderInstructionsCore(instructions, code, true, ReorderType::CROR);
}
void PPCAnalyzer::SetInstructionStats(CodeBlock* block, CodeOp* code,