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Tolerate degenerate phi nodes that can occur in the middle of optimization

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passes. Fixes PR9112. Patch by Jakub Staszak!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125319 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2011-02-10 23:54:10 +00:00
parent 2c2b933037
commit 3b739d278c
2 changed files with 28 additions and 0 deletions
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24
test/Transforms/JumpThreading/degenerate-phi.ll Normal file
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; RUN: opt -jump-threading -disable-output %s
; PR9112
; This is actually a test for value tracking. Jump threading produces
; "%phi = phi i16" when it removes all edges leading to %unreachable.
; The .ll parser won't let us write that directly since it's invalid code.
define void @func() nounwind {
entry:
br label %bb
bb:
br label %bb
unreachable:
%phi = phi i16 [ %add, %unreachable ], [ 0, %next ]
%add = add i16 0, %phi
%cmp = icmp slt i16 %phi, 0
br i1 %cmp, label %unreachable, label %next
next:
br label %unreachable
}