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Add a description to the test from r211433 explaining why it's written that way.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211465 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2014-06-22 12:22:04 +00:00
parent 78f173a22d
commit 84dd75d8d2
1 changed files with 6 additions and 0 deletions
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6
test/Transforms/IndVarSimplify/2014-06-21-congruent-constant.ll
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@ -1,5 +1,11 @@
; RUN: opt -S -loop-unswitch -instcombine -indvars < %s | FileCheck %s ; RUN: opt -S -loop-unswitch -instcombine -indvars < %s | FileCheck %s
; This used to crash in SCEVExpander when there were congruent phis with and
; undef incoming value from the loop header. The -loop-unswitch -instcombine is
; necessary to create just this pattern, which is essentially a nop and gets
; folded away aggressively if spelled out in IR directly.
; PR 20093
@c = external global i32**, align 8 @c = external global i32**, align 8
define void @test1() { define void @test1() {