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fix rdar://8813415 - a miscompilation of 164.gzip that loop-idiom

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exposed.  It turns out to be a latent bug in basicaa, scary.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122772 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2011-01-03 21:03:33 +00:00
parent 135bf42187
commit 895ace08e0
2 changed files with 24 additions and 0 deletions
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22
test/Analysis/BasicAA/global-size.ll
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@@ -16,3 +16,25 @@ define i16 @test1(i32* %P) {
; CHECK: ret i16 0
}
; Cannot know anything about the size of this global.
; rdar://8813415
@window = external global [0 x i8]
; CHECK: @test2
define i8 @test2(i32 %tmp79, i32 %w.2, i32 %indvar89) nounwind {
%tmp92 = add i32 %tmp79, %indvar89
%arrayidx412 = getelementptr [0 x i8]* @window, i32 0, i32 %tmp92
%tmp93 = add i32 %w.2, %indvar89
%arrayidx416 = getelementptr [0 x i8]* @window, i32 0, i32 %tmp93
%A = load i8* %arrayidx412, align 1
store i8 4, i8* %arrayidx416, align 1
%B = load i8* %arrayidx412, align 1
%C = sub i8 %A, %B
ret i8 %C
; CHECK: %B = load i8
; CHECK: ret i8 %C
}