[PATCH] D19013: [DivergenceAnalysis] Treat PHI with incoming undef as constant

[Jingyue Wu via llvm-commits]

jingyue accepted this revision.
jingyue added a comment.
This revision is now accepted and ready to land.

Thanks!


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Comment at: lib/IR/Instructions.cpp:160
@@ +159,3 @@
+/// non-undefs.
+/// Unlike  \ref hasConstantValue, this does not return a value because the
+/// unique non-undef incoming value need not dominate the PHI node.
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two spaces => one space

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Comment at: test/CodeGen/AMDGPU/branch-uniformity.ll:19
@@ +18,3 @@
+
+LOOP:                                             ; preds = %ENDLOOP48, %main_body
+  %counter = phi i32 [ 0, %main_body ], [ %counter.next, %ENDLOOP48 ]
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Traditionally, basic block names are lower-case. 


http://reviews.llvm.org/D19013