[llvm-branch-commits] [clang] [llvm] [HLSL][RootSignature] Implement validation of resource ranges for `RootDescriptors` (PR #140962)

[Finn Plummer via llvm-branch-commits]

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@@ -951,6 +952,108 @@ void SemaHLSL::emitLogicalOperatorFixIt(Expr *LHS, Expr *RHS,
       << NewFnName << FixItHint::CreateReplacement(FullRange, OS.str());
 }
 
+namespace {
+
+// A resource range overlaps with another resource range if they have:
+// - equivalent ResourceClass (SRV, UAV, CBuffer, Sampler)
+// - equivalent resource space
+// - overlapping visbility
+class ResourceRanges {
+public:
+  // KeyT: 32-lsb denotes resource space, and 32-msb denotes resource type enum
+  using KeyT = uint64_t;
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inbelic wrote:

I think I originally had it because I was using it in a switch statement in some prototype. But this should be fine to create a specialization as an `llvm::DenseMap` key

https://github.com/llvm/llvm-project/pull/140962