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Don't sink the instruction if TargetRegisterInfo::isSafeToMoveRegClassDefs doesn't think it's safe. This works around PR1911.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63994 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2009-02-07 01:21:47 +00:00
parent 0469280776
commit b6f5417edb
1 changed files with 4 additions and 0 deletions
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4
lib/CodeGen/MachineSink.cpp
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@ -167,6 +167,10 @@ bool MachineSinking::SinkInstruction(MachineInstr *MI, bool &SawStore) {
} else {
// Virtual register uses are always safe to sink.
if (MO.isUse()) continue;
// If it's not safe to move defs of the register class, then abort.
if (!TII->isSafeToMoveRegClassDefs(RegInfo->getRegClass(Reg)))
return false;
// FIXME: This picks a successor to sink into based on having one
// successor that dominates all the uses. However, there are cases where