(MFI.hasVarSizedObjects() || RegInfo->needsStackRealignment(MF)))
SavedRegs.set(ARM::R4);
+ // If a stack probe will be emitted, spill R4 and LR, since they are
+ // clobbered by the stack probe call.
+ // This estimate should be a safe, conservative estimate. The actual
+ // stack probe is enabled based on the size of the local objects;
+ // this estimate also includes the varargs store size.
+ if (STI.isTargetWindows() &&
+ WindowsRequiresStackProbe(MF, MFI.estimateStackSize(MF))) {
+ SavedRegs.set(ARM::R4);
+ SavedRegs.set(ARM::LR);
+ }
+
if (AFI->isThumb1OnlyFunction()) {
// Spill LR if Thumb1 function uses variable length argument lists.
if (AFI->getArgRegsSaveSize() > 0)