================
@@ -7513,6 +7516,41 @@ void Sema::checkCall(NamedDecl *FDecl, const
FunctionProtoType *Proto,
}
}
+ auto *CallerFD = dyn_cast<FunctionDecl>(CurContext);
+ bool IsCalleeStreaming = ((ExtInfo.AArch64SMEAttributes &
+ FunctionType::SME_PStateSMEnabledMask) ||
+ (ExtInfo.AArch64SMEAttributes &
+ FunctionType::SME_PStateSMCompatibleMask));
+ bool IsBuiltin = (FD && FD->getBuiltinID());
+
+ if (CallerFD && Context.getTargetInfo().hasFeature("sme") && !IsBuiltin) {
+ // If the callee has an AArch64 SME __arm_locally_streaming attribute
+ // warn if this function returns VL-based value or pass any such
argument,
+ // the streaming and non-streaming vector lengths may be different.
+ ArmStreamingType CallerFnType = getArmStreamingFnType(CallerFD);
+ // If the caller is a non-streaming function and the callee has a
+ // streaming attribute. If it passed any VL-based arguments or return
+ // VL-based value, then warn that the streaming and non-streaming vector
+ // lengths may be different.
+ if (CallerFnType != ArmStreaming) {
+ if (IsCalleeStreaming) {
+ if (AnyScalableArgs)
+ Diag(Loc,
diag::warn_sme_streaming_pass_return_vl_to_non_streaming);
+ if (Proto->getReturnType()->isSizelessVectorType())
+ Diag(Loc,
diag::warn_sme_streaming_pass_return_vl_to_non_streaming);
+ }
+ } else if (!IsCalleeStreaming) {
+ // If the callee is a non-streaming function and the caller has
+ // streaming attribute. If it passed any VL-based arguments or return
+ // VL-based value, then warn that the streaming and non-streaming
vector
+ // lengths may be different.
+ if (AnyScalableArgs)
+ Diag(Loc, diag::warn_sme_streaming_pass_return_vl_to_non_streaming);
+ if (Proto->getReturnType()->isSizelessVectorType())
+ Diag(Loc, diag::warn_sme_streaming_pass_return_vl_to_non_streaming);
+ }
----------------
sdesmalen-arm wrote:
Does this code support the following case:
```
void test_sc_to_n(sv_ty arg) __arm_streaming_compatible { n(arg); } // expect a
diagnostic
```
?
https://github.com/llvm/llvm-project/pull/79842
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