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Register re-use for scavenged frame indices must check for re-deginition

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of the register in the instruction which kills the scavenged value.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84641 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach 2009-10-20 16:33:57 +00:00
parent 1a49295eae
commit f7a0c0de6d
1 changed files with 4 additions and 0 deletions
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4
lib/CodeGen/PrologEpilogInserter.cpp
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@ -873,6 +873,10 @@ void PEI::scavengeFrameVirtualRegs(MachineFunction &Fn) {
PrevLastUseOp = i;
CurrentScratchReg = CurrentVirtReg = 0;
havePrevValue = trackingCurrentValue;
// Re-scan the operands of this instruction to catch definitions
// of the scratch register we're using. This is to handle things
// like ldr "r2, [scratch]" where scratch is r2.
i = 0;
}
}
RS->forward(MI);