Craig Topper 17b0c78447 [InstCombine] Fix a vector splat handling bug in transformZExtICmp. ...

We were using an i1 type and then zero extending to a vector. Instead just create the 0/1 directly as a ConstantInt with the correct type. No need to ask ConstantExpr to zero extend for us.

This bug is a bit tricky to hit because it requires us to visit a zext of an icmp that would normally be simplified to true/false, but that icmp hasnt' been visited yet. In the test case this zext and icmp were created by visiting a udiv and due to worklist ordering we got to the zext first.

Fixes PR34841.

llvm-svn: 314971

2017-10-05 07:59:11 +00:00

94 KiB

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