[clang] [llvm] [RISCV] SiFive CLIC Support (PR #132481)

[Craig Topper via cfe-commits]

================
@@ -1502,6 +1659,9 @@ void 
RISCVFrameLowering::determineCalleeSaves(MachineFunction &MF,
   auto *RVFI = MF.getInfo<RISCVMachineFunctionInfo>();
   if (RVFI->isPushable(MF) && SavedRegs.test(RISCV::X26))
     SavedRegs.set(RISCV::X27);
+
+  // SiFive Preemptible Interrupt Handlers need additional frame entries
+  createSiFivePreemptibleInterruptFrameEntries(MF, *RVFI);
----------------
topperc wrote:

Do we need to consider these frame indices in the `MinCSFrameIndex` and 
`MaxCSFrameIndex` returned by `assignCalleeSavedSpillSlots`?

https://github.com/llvm/llvm-project/pull/132481
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