[clang] [llvm] [SPIRV] Add size optimisation for AMDGCN flavoured SPIR-V (PR #228188)

[Alex Voicu via cfe-commits]

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@@ -1113,6 +1154,13 @@ void EmitAssemblyHelper::RunOptimizationPipeline(
     } else {
       MPM.addPass(PB.buildPerModuleDefaultPipeline(Level));
     }
+  } else if (mapToLevel(CodeGenOpts) > OptimizationLevel::O0 &&
+             CodeGenOpts.AMDGCNSPIRVSizeOptimization) {
+    if (!TargetTriple.isSPIRV() ||
+        (TargetTriple.getVendor() != llvm::Triple::VendorType::AMD))
+      Diags.Report(diag::err_opt_not_valid_on_target)
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AlexVlx wrote:

Yes, this should only apply to AMDGCN SPIR-V, this is intentionally a hard error.

https://github.com/llvm/llvm-project/pull/228188