[clang] MIPS/Clang: Add more false option pairs into validateTarget (PR #91968)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: YunQiang Su (wzssyqa)

<details>
<summary>Changes</summary>

The option pairs include:
	-mfpxx -mips1
	-msoft-float -mmsa
	-mmsa -mabi=32 with 32bit pre-R2 CPUs
	-mfpxx -mmsa
	-mfp32 -mmsa

---
Full diff: https://github.com/llvm/llvm-project/pull/91968.diff


1 Files Affected:

- (modified) clang/lib/Basic/Targets/Mips.cpp (+28) 


``````````diff
diff --git a/clang/lib/Basic/Targets/Mips.cpp b/clang/lib/Basic/Targets/Mips.cpp
index 3a65f53c52485..174bc9d2ab996 100644
--- a/clang/lib/Basic/Targets/Mips.cpp
+++ b/clang/lib/Basic/Targets/Mips.cpp
@@ -273,6 +273,34 @@ bool MipsTargetInfo::validateTarget(DiagnosticsEngine &Diags) const {
     Diags.Report(diag::err_mips_fp64_req) << "-mfp64";
     return false;
   }
+  // FPXX requires mips2+
+  if (FPMode == FPXX && CPU == "mips1") {
+    Diags.Report(diag::err_opt_not_valid_with_opt) << "-mfpxx" << CPU;
+    return false;
+  }
+  // -mmsa with -msoft-float makes nonsense
+  if (FloatABI == SoftFloat && HasMSA) {
+    Diags.Report(diag::err_opt_not_valid_with_opt) << "-msoft-float"
+                                                   << "-mmsa";
+    return false;
+  }
+  // Option -mmsa permitted on Mips32 iff revision 2 or higher is present
+  if (HasMSA && (CPU == "mips1" || CPU == "mips2" || getISARev() < 2) &&
+      ABI == "o32") {
+    Diags.Report(diag::err_mips_fp64_req) << "-mmsa";
+    return false;
+  }
+  // MSA requires FP64
+  if (FPMode == FPXX && HasMSA) {
+    Diags.Report(diag::err_opt_not_valid_with_opt) << "-mfpxx"
+                                                   << "-mmsa";
+    return false;
+  }
+  if (FPMode == FP32 && HasMSA) {
+    Diags.Report(diag::err_opt_not_valid_with_opt) << "-mfp32"
+                                                   << "-mmsa";
+    return false;
+  }
 
   return true;
 }

``````````

</details>


https://github.com/llvm/llvm-project/pull/91968