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gvn should never crash on this.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60987 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-12-13 18:39:44 +00:00
parent 44b838d5b5
commit c2f33f24af
1 changed files with 35 additions and 0 deletions
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test/Transforms/GVN/2008-12-12-RLE-Crash.ll Normal file
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; RUN: llvm-as < %s | opt -gvn | llvm-dis
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
target triple = "i386-apple-darwin7"
define i32 @main(i32 %argc, i8** %argv) nounwind {
entry:
br label %bb84
bb41: ; preds = %bb82
%tmp = load i8* %opt.0, align 1 ; <i8> [#uses=0]
%tmp1 = getelementptr i8* %opt.0, i32 1 ; <i8*> [#uses=2]
switch i32 0, label %bb81 [
i32 102, label %bb82
i32 110, label %bb79
i32 118, label %bb80
]
bb79: ; preds = %bb41
br label %bb82
bb80: ; preds = %bb41
ret i32 0
bb81: ; preds = %bb41
ret i32 1
bb82: ; preds = %bb84, %bb79, %bb41
%opt.0 = phi i8* [ %tmp3, %bb84 ], [ %tmp1, %bb79 ], [ %tmp1, %bb41 ] ; <i8*> [#uses=3]
%tmp2 = load i8* %opt.0, align 1 ; <i8> [#uses=0]
br i1 false, label %bb84, label %bb41
bb84: ; preds = %bb82, %entry
%tmp3 = getelementptr i8* null, i32 1 ; <i8*> [#uses=1]
br label %bb82
}