================
@@ -241,9 +314,34 @@ class PrologEpilogSGPRSpillBuilder {
ArrayRef<int16_t> SplitParts;
unsigned NumSubRegs;
unsigned EltSize = 4;
+ bool IsFramePtrPrologSpill;
+ bool NeedsFrameMoves;
+
+ static bool isExec(Register Reg) {
+ return Reg == AMDGPU::EXEC_LO || Reg == AMDGPU::EXEC;
+ }
+
+ /// If this builder requires SuperReg-based CFI, which is emitted after all
+ /// SubRegs are actually spilled, return the Register which should be used
+ /// as input to getDwarfRegNum. Otherwise, CFI should be generated
per-SubReg.
+ ///
+ /// Note: Most spills handled by this builder generate CFI after each
+ /// SubReg spill, as each SubReg maps directly to a CFI register via
+ /// getDwarfRegNum(SubReg, false). All other cases currently currently
+ /// correspond to the SuperReg directly.
+ std::optional<Register> getCFISuperReg() const {
+ if (IsFramePtrPrologSpill)
+ return FuncInfo->getFrameOffsetReg();
+ // FIXME: CFI for EXEC needs a fix by accurately computing the spill
+ // offset for both the low and high components.
+ if (isExec(SuperReg))
+ return AMDGPU::EXEC;
+ return std::nullopt;
----------------
arsenm wrote:
```suggestion
MCRegister getCFISuperReg() const {
if (IsFramePtrPrologSpill)
return FuncInfo->getFrameOffsetReg();
// FIXME: CFI for EXEC needs a fix by accurately computing the spill
// offset for both the low and high components.
if (isExec(SuperReg))
return AMDGPU::EXEC;
return {};
```
https://github.com/llvm/llvm-project/pull/164723
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