================
@@ -515,6 +515,17 @@ BitVector X86RegisterInfo::getReservedRegs(const
MachineFunction &MF) const {
// Set the Shadow Stack Pointer as reserved.
Reserved.set(X86::SSP);
+ auto &ST = MF.getSubtarget<X86Subtarget>();
+ if (ST.is64Bit()) {
+ for (size_t Reg = 0; Reg < getNumRegs(); Reg++) {
+ // Set r# as reserved register if user required
+ if (ST.isRegisterReservedByUser(Reg)) {
+ for (const MCPhysReg &SubReg : subregs_inclusive(X86::RSP))
----------------
phoebewang wrote:
Why RSP?
https://github.com/llvm/llvm-project/pull/180242
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