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Check all overlaps when looking for used registers.

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A function using any RC alias is enough to enable the ExeDepsFix pass.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144636 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-11-15 08:20:43 +00:00
parent f4a5084d06
commit d1bfc30198
1 changed files with 5 additions and 4 deletions
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9
lib/CodeGen/ExecutionDepsFix.cpp
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@ -650,10 +650,11 @@ bool ExeDepsFix::runOnMachineFunction(MachineFunction &mf) {
bool anyregs = false;
for (TargetRegisterClass::const_iterator I = RC->begin(), E = RC->end();
I != E; ++I)
if (MF->getRegInfo().isPhysRegUsed(*I)) {
anyregs = true;
break;
}
for (const unsigned *AI = TRI->getOverlaps(*I); *AI; ++AI)
if (MF->getRegInfo().isPhysRegUsed(*AI)) {
anyregs = true;
break;
}
if (!anyregs) return false;
// Initialize the AliasMap on the first use.