[llvm] [RISCV] Disable Zilsd CSR-pair generation when push/pop or save-restore is enabled (PR #200623)

[Sudharsan Veeravalli via llvm-commits]

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@@ -1690,9 +1690,13 @@ void RISCVFrameLowering::determineCalleeSaves(MachineFunction &MF,
   // For Zilsd on RV32, append GPRPair registers to the CSR list. This prevents
   // the need to create register sets for each abi which is a lot more complex.
   // Don't use Zilsd for callee-saved coalescing if the required alignment
-  // exceeds the stack alignment.
+  // exceeds the stack alignment or when Zcmp/Xqccmp or save/restore libcalls
+  // are enabled.
+  bool HasPushPopCompression = STI.hasStdExtZcmp() || STI.hasVendorXqccmp();
   bool UseZilsd = !STI.is64Bit() && STI.hasStdExtZilsd() &&
-                  STI.getZilsdAlign() <= getStackAlign();
+                  STI.getZilsdAlign() <= getStackAlign() &&
+                  !RVFI->isPushable(MF) && !RVFI->useSaveRestoreLibCalls(MF) &&
+                  !HasPushPopCompression;
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svs-quic wrote:

Yeah thanks I've removed it.

https://github.com/llvm/llvm-project/pull/200623