+bool X86SelectionDAGInfo::isBaseRegConflictPossible(
+ SelectionDAG &DAG, ArrayRef<unsigned> ClobberSet) const {
+ // We cannot use TRI->hasBasePointer() until *after* we select all basic
+ // blocks. Legalization may introduce new stack temporaries with large
+ // alignment requirements. Fall back to generic code if there are any
+ // dynamic stack adjustments (hopefully rare) and the base pointer would
+ // conflict if we had to use it.
+ MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
+ if (!MFI->hasVarSizedObjects() && !MFI->hasInlineAsmWithSPAdjust())
+ return false;
+
+ const X86RegisterInfo *TRI = static_cast<const X86RegisterInfo *>(
+ DAG.getSubtarget().getRegisterInfo());
+ unsigned BaseReg = TRI->getBaseRegister();
+ for (unsigned R : ClobberSet)
+ if (BaseReg == R)
+ return true;
+ return false;