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JIT: Disallow using float callee saves in x64 functions with patchpoints #127158

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Merged
jakobbotsch merged 3 commits into from
Apr 21, 2026
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JIT: Disallow using float callee saves in x64 functions with patchpoints #127158

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JIT: Disallow using float callee saves in x64 functions with patchpoints
jakobbotsch Apr 20, 2026
493c885
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jakobbotsch Apr 20, 2026
61bd3e4
Remove RBM_MSK_CALLEE_SAVED for future proofing
jakobbotsch Apr 20, 2026
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16 changes: 16 additions & 0 deletions src/coreclr/jit/lsra.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -984,6 +984,22 @@ LinearScan::LinearScan(Compiler* theCompiler)
}
#endif // TARGET_AMD64 || TARGET_ARM64

#ifdef TARGET_AMD64
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// On x64 the OSR method does not restore float/mask registers from the
// tier0 frame, so disallow using those in the tier0 method.
if (m_compiler->doesMethodHavePatchpoints() || m_compiler->doesMethodHavePartialCompilationPatchpoints())
{
#if defined(UNIX_AMD64_ABI)
availableFloatRegs &= ~RBM_FLT_CALLEE_SAVED;
availableDoubleRegs &= ~RBM_FLT_CALLEE_SAVED;
#else
availableFloatRegs &= ~RBM_FLT_CALLEE_SAVED.GetFloatRegSet();
availableDoubleRegs &= ~RBM_FLT_CALLEE_SAVED.GetFloatRegSet();
#endif // UNIX_AMD64_ABI
availableMaskRegs &= ~RBM_MSK_CALLEE_SAVED;
}
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#endif
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#if defined(TARGET_AMD64)
if (evexIsSupported)
{
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