[llvm] [SPIRV] Emitting DebugSource, DebugCompileUnit (PR #97558)

[via llvm-commits]

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@@ -427,7 +426,22 @@ void SPIRVModuleAnalysis::processOtherInstrs(const Module &M) {
         if (MAI.getSkipEmission(&MI))
           continue;
         const unsigned OpCode = MI.getOpcode();
-        if (OpCode == SPIRV::OpName || OpCode == SPIRV::OpMemberName) {
+        if (OpCode == SPIRV::OpString) {
+          collectOtherInstr(MI, MAI, SPIRV::MB_DebugStrings, IS);
+        } else if (OpCode == SPIRV::OpExtInst) {
+          MachineOperand Ins = MI.getOperand(3);
+          namespace NS = SPIRV::NonSemanticExtInst;
+          static constexpr int64_t GlobalNonSemanticDITy[] = {
+              NS::DebugSource, NS::DebugCompilationUnit};
+          bool IsGlobalDI = false;
+          for (unsigned Idx = 0; Idx < std::size(GlobalNonSemanticDITy);
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bwlodarcz wrote:

Thanks for suggestion. Unfortunately usage of early stopping is less efficient in small to medium set linear search loop for simple types. It's introduces one additional branch which at least once will involve penalty for missing prediction and pipeline dump. In addition to that, the branch avoidance allows for loop unroll optimization and allow compiler vectorization optimization.

https://github.com/llvm/llvm-project/pull/97558