================
@@ -596,6 +597,21 @@ void CGHLSLRuntime::finishCodeGen() {
M.setModuleFlag(llvm::Module::ModFlagBehavior::Error, "dx.nativelowprec",
1);
+ if (LangOpts.HLSLSpvPreserveInterface && T.isSPIRV()) {
+ // Runs before optimization. Keeps Input/Output globals from GlobalDCE.
+ const ASTContext &Ctx = CGM.getContext();
+ unsigned InputAS = Ctx.getTargetAddressSpace(LangAS::hlsl_input);
+ unsigned OutputAS = Ctx.getTargetAddressSpace(LangAS::hlsl_output);
+ SmallVector<GlobalValue *, 8> InterfaceVars;
----------------
bogner wrote:
Probably better to use the heuristic for the size of the SmallVector unless we
have a good reason for 8 specifically.
```suggestion
SmallVector<GlobalValue *> InterfaceVars;
```
https://github.com/llvm/llvm-project/pull/196404
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