================
@@ -4043,6 +4043,53 @@ template <typename AttrT> static bool
hasImplicitAttr(const ValueDecl *D) {
return D->isImplicit();
}
+static bool shouldSkipAliasEmission(const CodeGenModule &CGM,
+ const ValueDecl *Global) {
+ const LangOptions &LangOpts = CGM.getLangOpts();
+ if (!(LangOpts.OpenMPIsTargetDevice || LangOpts.CUDA))
+ return false;
+
+ const auto *AA = Global->getAttr<AliasAttr>();
+ GlobalDecl AliaseeGD;
+
+ // Check if the aliasee exists.
+ if (!CGM.lookupRepresentativeDecl(AA->getAliasee(), AliaseeGD)) {
+ // If the aliasee is not found, skip the alias emission.
+ // This is not a hard error as this branch is executed for both the host
+ // and device, with no respect to where the aliasee is defined.
+ // For some OpenMP cases (functions) this will return true even if the
+ // aliasee is not on the device, which is handled by the case below
+ return true;
+ }
+
+ const auto *AliaseeDecl = dyn_cast<ValueDecl>(AliaseeGD.getDecl());
+ if (LangOpts.OpenMPIsTargetDevice) {
+ if (!AliaseeDecl ||
+ !OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(AliaseeDecl))
+ // On OpenMP device, skip alias emission if the aliasee is not marked
+ // with declare target.
+ return true;
+ return false;
+ }
+
+ // CUDA / HIP
+ const bool HasDeviceAttr = Global->hasAttr<CUDADeviceAttr>();
+ const bool AliaseeHasDeviceAttr =
+ AliaseeDecl && AliaseeDecl->hasAttr<CUDADeviceAttr>();
+
+ if (LangOpts.CUDAIsDevice) {
+ if (!HasDeviceAttr || !AliaseeHasDeviceAttr)
+ // On device, skip alias emission if either the alias or the aliasee
+ // is not marked with __device__.
+ return true;
+ return false;
+ }
----------------
jhuber6 wrote:
```suggestion
if (LangOpts.CUDAIsDevice)
return !HasDeviceAttr || !AliaseeHasDeviceAttr;
```
https://github.com/llvm/llvm-project/pull/164326
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