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Assert that the last operand is actually EFLAGS 

This is another follow-up to r197503, after a post-commit review by
Andy.

<rdar://problem/15627766>

llvm-svn: 197520
This commit is contained in:
Duncan P. N. Exon Smith 2013-12-17 20:28:21 +00:00
parent 89077a1b00
commit ab5dbebc11
1 changed files with 6 additions and 0 deletions
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6
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -15338,6 +15338,12 @@ X86TargetLowering::EmitVAStartSaveXMMRegsWithCustomInserter(
MBB->addSuccessor(EndMBB);
}
// Make sure the last operand is EFLAGS, which gets clobbered by the branch
// that was just emitted, but clearly shouldn't be "saved".
assert((MI->getNumOperands() <= 3 ||
!MI->getOperand(MI->getNumOperands() - 1).isReg() ||
MI->getOperand(MI->getNumOperands() - 1).getReg() == X86::EFLAGS)
&& "Expected last argument to be EFLAGS");
unsigned MOVOpc = Subtarget->hasFp256() ? X86::VMOVAPSmr : X86::MOVAPSmr;
// In the XMM save block, save all the XMM argument registers.
for (int i = 3, e = MI->getNumOperands() - 1; i != e; ++i) {