[PATCH] D124158: [Clang][Attr] Skip adding noundef attribute to arguments when function has convergent attribute

[krishna chaitanya sankisa via Phabricator via cfe-commits]

skc7 added inline comments.


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Comment at: clang/lib/CodeGen/CGCall.cpp:2435
         DetermineNoUndef(ParamType, getTypes(), DL, AI)) {
-      Attrs.addAttribute(llvm::Attribute::NoUndef);
+      if(!FuncAttrs.contains(llvm::Attribute::Convergent))
+        Attrs.addAttribute(llvm::Attribute::NoUndef);
----------------
arsenm wrote:
> Missing space before (.
>  
> Needs comment explaining this
Updated


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Comment at: llvm/test/Transforms/SimplifyCFG/tautological-conditional-branch-convergent-noundef.ll:26
+  %i3 = phi double [%i2, %bb2], [undef, %bb1] 
+  %i4 = call noundef double @two(double %i3, i1 %i1) 
+  ret void
----------------
arsenm wrote:
> Aren't the cases with defined handling of undef lanes still defined for the result?
ret double %i4? 


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  https://reviews.llvm.org/D124158/new/

https://reviews.llvm.org/D124158