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author | Evan Cheng <evan.cheng@apple.com> | 2009-02-09 07:14:22 +0000 |
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committer | Evan Cheng <evan.cheng@apple.com> | 2009-02-09 07:14:22 +0000 |
commit | dc54d317e7a381ef8e4aca80d54ad1466bb85dda (patch) | |
tree | f270708392612a47df3c09a023d1541097ae3147 /lib/Target/Alpha/AlphaInstrInfo.cpp | |
parent | 0de5d6fce05dcdb6e9ea2368f02b936b0c50aacf (diff) | |
download | llvm-dc54d317e7a381ef8e4aca80d54ad1466bb85dda.tar.gz llvm-dc54d317e7a381ef8e4aca80d54ad1466bb85dda.tar.bz2 llvm-dc54d317e7a381ef8e4aca80d54ad1466bb85dda.tar.xz |
Turns out AnalyzeBranch can modify the mbb being analyzed. This is a nasty
suprise to some callers, e.g. register coalescer. For now, add an parameter
that tells AnalyzeBranch whether it's safe to modify the mbb. A better
solution is out there, but I don't have time to deal with it right now.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64124 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/Alpha/AlphaInstrInfo.cpp')
-rw-r--r-- | lib/Target/Alpha/AlphaInstrInfo.cpp | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/lib/Target/Alpha/AlphaInstrInfo.cpp b/lib/Target/Alpha/AlphaInstrInfo.cpp index 2c7404d564..0974699fa0 100644 --- a/lib/Target/Alpha/AlphaInstrInfo.cpp +++ b/lib/Target/Alpha/AlphaInstrInfo.cpp @@ -321,8 +321,9 @@ static unsigned AlphaRevCondCode(unsigned Opcode) { // Branch analysis. bool AlphaInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB, - MachineBasicBlock *&FBB, - SmallVectorImpl<MachineOperand> &Cond) const { + MachineBasicBlock *&FBB, + SmallVectorImpl<MachineOperand> &Cond, + bool AllowModify) const { // If the block has no terminators, it just falls into the block after it. MachineBasicBlock::iterator I = MBB.end(); if (I == MBB.begin() || !isUnpredicatedTerminator(--I)) @@ -373,7 +374,8 @@ bool AlphaInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TB LastInst->getOpcode() == Alpha::BR) { TBB = SecondLastInst->getOperand(0).getMBB(); I = LastInst; - I->eraseFromParent(); + if (AllowModify) + I->eraseFromParent(); return false; } |