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Remove needless register transfers from inner loops

This commit is contained in:
drmortalwombat 2024-11-12 13:37:50 +01:00
parent 2a476d3372
commit 4acee4531c
1 changed files with 30 additions and 3 deletions
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33
oscar64/NativeCodeGenerator.cpp
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@ -39809,6 +39809,34 @@ bool NativeCodeBasicBlock::OptimizeSingleEntryLoopInvariant(NativeCodeProcedure*
} }
} }
if (!changed)
{
if (mIns.Size() > 0 && mIns[0].mType == ASMIT_TXA)
{
if (!ChangesAccu(1) && !ChangesXReg(1))
{
int i = 0;
while (i < lblocks.Size() && (lblocks[i] == this || (!lblocks[i]->ChangesXReg() && !lblocks[i]->ChangesAccu())))
i++;
if (i == lblocks.Size())
{
prev->mIns.Push(mIns[0]);
mIns.Remove(0);
prev->mExitRequiredRegs += CPU_REG_A;
mEntryRequiredRegs += CPU_REG_A;
mExitRequiredRegs += CPU_REG_A;
for (int i = 0; i < lblocks.Size(); i++)
{
lblocks[i]->mEntryRequiredRegs += CPU_REG_A;
lblocks[i]->mExitRequiredRegs += CPU_REG_A;
}
changed = true;
}
}
}
}
if (!changed) if (!changed)
{ {
if (mIns.Size() > 0 && mIns[0].mType == ASMIT_LDY && mIns[0].mMode == ASMIM_ZERO_PAGE) if (mIns.Size() > 0 && mIns[0].mType == ASMIT_LDY && mIns[0].mMode == ASMIM_ZERO_PAGE)
@ -51718,7 +51746,7 @@ void NativeCodeProcedure::Compile(InterCodeProcedure* proc)
mInterProc = proc; mInterProc = proc;
mInterProc->mLinkerObject->mNativeProc = this; mInterProc->mLinkerObject->mNativeProc = this;
CheckFunc = !strcmp(mInterProc->mIdent->mString, "status_draw_map"); CheckFunc = !strcmp(mInterProc->mIdent->mString, "main");
int nblocks = proc->mBlocks.Size(); int nblocks = proc->mBlocks.Size();
tblocks = new NativeCodeBasicBlock * [nblocks]; tblocks = new NativeCodeBasicBlock * [nblocks];
@ -52892,7 +52920,7 @@ void NativeCodeProcedure::Optimize(void)
CheckBlocks(); CheckBlocks();
#if 1 #if 1
if (step == 3 || step == 4 || (step == 15 && cnt > 0)) if (step == 3 || step == 4 || step == 8 || (step == 15 && cnt > 0))
{ {
#if 1 #if 1
ResetVisited(); ResetVisited();
@ -53549,7 +53577,6 @@ void NativeCodeProcedure::Optimize(void)
} while (changed); } while (changed);
#if 1 #if 1
ResetVisited(); ResetVisited();
mEntryBlock->CombineAlternateLoads(); mEntryBlock->CombineAlternateLoads();