[clang] [llvm] [RISCV] QCI Interrupt Support (PR #129957)

[Sam Elliott via cfe-commits]

================
@@ -1892,9 +1970,23 @@ bool RISCVFrameLowering::spillCalleeSavedRegisters(
   if (MI != MBB.end() && !MI->isDebugInstr())
     DL = MI->getDebugLoc();
 
-  // Emit CM.PUSH with base SPimm & evaluate Push stack
   RISCVMachineFunctionInfo *RVFI = MF->getInfo<RISCVMachineFunctionInfo>();
-  if (RVFI->isPushable(*MF)) {
+  if (RVFI->useQCIInterrupt(*MF)) {
+    // Emit QC.C.MIENTER(.NEST)
+    BuildMI(
+        MBB, MI, DL,
+        TII.get(RVFI->getInterruptStackKind(*MF) ==
+                        RISCVMachineFunctionInfo::InterruptStackKind::QCINest
+                    ? RISCV::QC_C_MIENTER_NEST
+                    : RISCV::QC_C_MIENTER))
+        .setMIFlag(MachineInstr::FrameSetup);
+
+    for (auto [Reg, _Offset] : FixedCSRFIQCIInterruptMap) {
----------------
lenary wrote:

Done

https://github.com/llvm/llvm-project/pull/129957