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New testcase for a bug identified by Vikram

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3625 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2002-09-08 21:37:49 +00:00
parent 823c4abb58
commit 05eb9581b2
1 changed files with 20 additions and 0 deletions
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test/Transforms/InstCombine/2002-09-08-PointerShiftBug.ll Normal file
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; This tests for a bug exposed by the Olden health benchmark where a shift of a
; pointer was thrown away, causing this whole example to be "optimized" away,
; which was quite bogus. Check that this is fixed.
;
; RUN: as < %s | opt -instcombine | dis | grep reg162
implementation ; Functions:
int %test(uint %cann-indvar) {
%reg189-scale = mul uint %cann-indvar, 4294967295 ; <uint> [#uses=1]
%reg189 = add uint %reg189-scale, 3 ; <uint> [#uses=1]
%cast362 = cast uint %reg189 to int ; <int> [#uses=1]
%cast363 = cast int %cast362 to sbyte* ; <sbyte*> [#uses=2]
%reg160 = shl sbyte* %cast363, ubyte 1 ; <sbyte*> [#uses=1]
%reg161 = add sbyte* %reg160, %cast363 ; <sbyte*> [#uses=1]
%reg162 = shl sbyte* %reg161, ubyte 2 ; <sbyte*> [#uses=1]
%RV = cast sbyte* %reg162 to int ; <int> [#uses=1]
ret int %RV
}