[RISCV] fix SP recovery in varargs functions

dlav-sc · dlav-sc · commit 1ce497f0b8da · 2024-10-31T19:03:40.000Z
diff --git a/llvm/lib/Target/RISCV/RISCVFrameLowering.cpp b/llvm/lib/Target/RISCV/RISCVFrameLowering.cpp
@@ -809,9 +809,7 @@ void RISCVFrameLowering::emitEpilogue(MachineFunction &MF,
   uint64_t StackSize = FirstSPAdjustAmount ? FirstSPAdjustAmount
                                            : getStackSizeWithRVVPadding(MF) -
                                                  RVFI->getReservedSpillsSize();
-  uint64_t FPOffset = FirstSPAdjustAmount ? FirstSPAdjustAmount
-                                          : getStackSizeWithRVVPadding(MF) -
-                                                RVFI->getVarArgsSaveSize();
+  uint64_t FPOffset = RealStackSize - RVFI->getVarArgsSaveSize();
   uint64_t RVVStackSize = RVFI->getRVVStackSize();
 
   bool RestoreFP = RI->hasStackRealignment(MF) || MFI.hasVarSizedObjects() ||
