================
@@ -4065,8 +4065,40 @@ void CodeGenModule::EmitGlobal(GlobalDecl GD) {
// If this is an alias definition (which otherwise looks like a declaration)
// emit it now.
- if (Global->hasAttr<AliasAttr>())
+ if (Global->hasAttr<AliasAttr>()) {
+ if (LangOpts.OpenMPIsTargetDevice || LangOpts.CUDA) {
+ const auto *AA = Global->getAttr<AliasAttr>();
+ assert(AA && "Not an alias?");
+ GlobalDecl AliaseeGD;
+ if (!lookupRepresentativeDecl(AA->getAliasee(), AliaseeGD)) {
+ if (LangOpts.CUDA)
+ // Failed to find aliasee on device side, skip emitting
+ return;
+ } else {
+ const auto *AliaseeDecl = dyn_cast<ValueDecl>(AliaseeGD.getDecl());
+ if (LangOpts.OpenMPIsTargetDevice) {
+ if (!AliaseeDecl ||
+ !OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(
+ AliaseeDecl))
+ // Not a target declaration, skip emitting
+ return;
+ } else {
+ // HIP/CUDA
+ const bool HasDeviceAttr = Global->hasAttr<CUDADeviceAttr>();
+ const bool AliaseeHasDeviceAttr =
+ AliaseeDecl && AliaseeDecl->hasAttr<CUDADeviceAttr>();
+ if (LangOpts.CUDAIsDevice) {
+ if (!HasDeviceAttr || !AliaseeHasDeviceAttr)
+ return;
+ } else if (HasDeviceAttr && AliaseeHasDeviceAttr) {
+ // Alias is only on device side, skip emitting on host side
+ return;
----------------
Jason-VanBeusekom wrote:
It is needed as `LangOpts.CUDA` is true for both the host and device
compilation, for the host compilation case (the else if) we need to skip if the
alias / Aliasee is only on the device, and for the device side we need to make
sure both the alias and aliasee are both on the device.
in
[16c1a68](https://github.com/llvm/llvm-project/pull/164326/commits/16c1a6888b87644f24c07a75c067d9e25eb1ac3e)
I refactored this and added comments to hopefully clear this up. I also added
a comment below going into depth about the various states in the refactor and
when they are triggered.
https://github.com/llvm/llvm-project/pull/164326
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