diff options
Diffstat (limited to 'llvm/lib/CodeGen')
| -rw-r--r-- | llvm/lib/CodeGen/RegUsageInfoCollector.cpp | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/llvm/lib/CodeGen/RegUsageInfoCollector.cpp b/llvm/lib/CodeGen/RegUsageInfoCollector.cpp index 855aa37ff3c..214c6d2c820 100644 --- a/llvm/lib/CodeGen/RegUsageInfoCollector.cpp +++ b/llvm/lib/CodeGen/RegUsageInfoCollector.cpp @@ -128,9 +128,11 @@ bool RegUsageInfoCollector::runOnMachineFunction(MachineFunction &MF) { if (!TargetFrameLowering::isSafeForNoCSROpt(F)) { const uint32_t *CallPreservedMask = TRI->getCallPreservedMask(MF, F->getCallingConv()); - // Set callee saved register as preserved. - for (unsigned i = 0; i < RegMaskSize; ++i) - RegMask[i] = RegMask[i] | CallPreservedMask[i]; + if (CallPreservedMask) { + // Set callee saved register as preserved. + for (unsigned i = 0; i < RegMaskSize; ++i) + RegMask[i] = RegMask[i] | CallPreservedMask[i]; + } } else { ++NumCSROpt; DEBUG(dbgs() << MF.getName() |
