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JIT/x86: Fix reported kill regs for varargs prologs #113793

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Merged
merged 2 commits into from
Mar 22, 2025
Merged

JIT/x86: Fix reported kill regs for varargs prologs #113793

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d79301e
x86: Fix reported kill regs for varargs prologs
filipnavara Mar 22, 2025
88138f0
Address PR feedback
filipnavara Mar 22, 2025
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9 changes: 9 additions & 0 deletions src/coreclr/jit/lsrabuild.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2443,6 +2443,15 @@ void LinearScan::buildIntervals()
// assert(block->isRunRarely());
}

#ifdef TARGET_X86
// On x86 w/ varargs CodeGen::genFnProlog trashs eax register which happens
// to be the hidden stub parameter, so mark it as killed here.
if ((block == compiler->fgFirstBB) && compiler->info.compIsVarArgs)
{
addKillForRegs(RBM_EAX, currentLoc + 1);
}
#endif

// For Swift calls there can be an arbitrary amount of codegen related
// to homing of decomposed struct parameters passed on stack. We cannot
// do that in the prolog. We handle registers in the prolog and the
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