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Commit b8743a91 authored by Benjamin Kramer's avatar Benjamin Kramer
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InstCombine: Fix infinite loop when encountering switch on trivial icmp. 

The test case feeds the following into InstCombine's visitSelect:
%tobool8 = icmp ne i32 0, 0
%phitmp = select i1 %tobool8, i32 3, i32 0
Then instcombine replaces the right side of the switch with 0, doesn't notice
that nothing changes and tries again indefinitely.

This fixes PR12897.

llvm-svn: 157587
parent 1ab17ed5
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