return false;
}
+int X86InstrInfo::getSPAdjust(const MachineInstr *MI) const {
+ const MachineFunction *MF = MI->getParent()->getParent();
+ const TargetFrameLowering *TFI = MF->getSubtarget().getFrameLowering();
+
+ if (MI->getOpcode() == getCallFrameSetupOpcode() ||
+ MI->getOpcode() == getCallFrameDestroyOpcode()) {
+ unsigned StackAlign = TFI->getStackAlignment();
+ int SPAdj = (MI->getOperand(0).getImm() + StackAlign - 1) / StackAlign *
+ StackAlign;
+
+ SPAdj -= MI->getOperand(1).getImm();
+
+ if (MI->getOpcode() == getCallFrameSetupOpcode())
+ return SPAdj;
+ else
+ return -SPAdj;
+ }
+
+ // To know whether a call adjusts the stack, we need information
+ // that is bound to the following ADJCALLSTACKUP pseudo.
+ // Look for the next ADJCALLSTACKUP that follows the call.
+ if (MI->isCall()) {
+ const MachineBasicBlock* MBB = MI->getParent();
+ auto I = ++MachineBasicBlock::const_iterator(MI);
+ for (auto E = MBB->end(); I != E; ++I) {
+ if (I->getOpcode() == getCallFrameDestroyOpcode() ||
+ I->isCall())
+ break;
+ }
+
+ // If we could not find a frame destroy opcode, then it has already
+ // been simplified, so we don't care.
+ if (I->getOpcode() != getCallFrameDestroyOpcode())
+ return 0;
+
+ return -(I->getOperand(1).getImm());
+ }
+
+ // Currently handle only PUSHes we can reasonably expect to see
+ // in call sequences
+ switch (MI->getOpcode()) {
+ default:
+ return 0;
+ case X86::PUSH32i8:
+ case X86::PUSH32r:
+ case X86::PUSH32rmm:
+ case X86::PUSH32rmr:
+ case X86::PUSHi32:
+ return 4;
+ }
+}
+
/// isFrameOperand - Return true and the FrameIndex if the specified
/// operand and follow operands form a reference to the stack frame.
bool X86InstrInfo::isFrameOperand(const MachineInstr *MI, unsigned int Op,