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ARM: Avoid dereferencing end() in ARMFrameLowering::emitPrologue

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llvm::tryFoldSPUpdateIntoPushPop assumes its arguments are valid
MachineInstrs.  Update ARMFrameLowering::emitPrologue to respect that;
when LastPush==end(), it can't possibly be a push instruction anyway.

llvm-svn: 278880
This commit is contained in:
Duncan P. N. Exon Smith 2016-08-17 00:53:04 +00:00
parent ca18e893b4
commit 85cf053288
1 changed files with 2 additions and 1 deletions
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3
lib/Target/ARM/ARMFrameLowering.cpp
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@ -413,7 +413,8 @@ void ARMFrameLowering::emitPrologue(MachineFunction &MF,
// .cfi_offset operations will reflect that.
if (DPRGapSize) {
assert(DPRGapSize == 4 && "unexpected alignment requirements for DPRs");
if (tryFoldSPUpdateIntoPushPop(STI, MF, &*LastPush, DPRGapSize))
if (LastPush != MBB.end() &&
tryFoldSPUpdateIntoPushPop(STI, MF, &*LastPush, DPRGapSize))
DefCFAOffsetCandidates.addExtraBytes(LastPush, DPRGapSize);
else {
emitSPUpdate(isARM, MBB, MBBI, dl, TII, -DPRGapSize,