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PPCAnalyst: Count outputs as being in use 

In a code block where a guest register is accessed at least twice and the
last access is a write and the register is not discardable immediately
after the second-to-last instruction (perhaps there is an instruction
in between that can cause an exception), currently Dolphin's JITs will
flush the register after the second-to-last instruction.

It would be better if we replaced the flush after the second-to-last
instruction with a flush that only happens if the exception path is
taken. This change accomplishes that by marking guest registers as
"in use" not just when they are used as inputs but also when they are
used as outputs, preventing the loop in DoJit from flushing the
register until after the last access.
This commit is contained in:
JosJuice 2022-02-14 22:09:21 +01:00
parent 86dbf768b9
commit 20b2300ce1
1 changed files with 2 additions and 2 deletions
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4
Source/Core/Core/PowerPC/PPCAnalyst.cpp
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@ -946,8 +946,8 @@ u32 PPCAnalyzer::Analyze(u32 address, CodeBlock* block, CodeBuffer* buffer,
op.gprDiscardable = gprDiscardable; op.gprDiscardable = gprDiscardable;
op.fprDiscardable = fprDiscardable; op.fprDiscardable = fprDiscardable;
op.fprInXmm = fprInXmm; op.fprInXmm = fprInXmm;
gprInUse |= op.regsIn; gprInUse |= op.regsIn | op.regsOut;
fprInUse |= op.fregsIn; fprInUse |= op.fregsIn | op.GetFregsOut();
if (op.canEndBlock || op.canCauseException) if (op.canEndBlock || op.canCauseException)
{ {
gprDiscardable = BitSet32{}; gprDiscardable = BitSet32{};