[PATCH] D97495: [SimplifyCFG] avoid illegal phi with both poison and undef

[Sanjay Patel via Phabricator via llvm-commits]

spatel marked an inline comment as done.
spatel added inline comments.


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Comment at: llvm/test/Transforms/SimplifyCFG/poison-merge.ll:14-17
+; CHECK-NEXT:    [[K2:%.*]] = phi i64 [ [[K3:%.*]], [[G]] ], [ undef, [[ENTRY:%.*]] ]
+; CHECK-NEXT:    br label [[G]]
+; CHECK:       g:
+; CHECK-NEXT:    [[K3]] = phi i64 [ [[K2]], [[LOOP]] ], [ poison, [[ENTRY]] ]
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lebedev.ri wrote:
> It looks like we didn't merge them after all?
That's correct - let me add some tests of the other value combos to make it clearer what this patch does.


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