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New testcase for a problem that occurred in 132.ijpeg

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19630 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-01-17 06:25:59 +00:00
parent a3fd1c569c
commit f60513f71d
1 changed files with 16 additions and 0 deletions
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test/CodeGen/X86/2005-01-17-CycleInDAG.ll Normal file
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; This testcase was distilled from 132.ijpeg. Bsaically we cannot fold the
; load into the sub instruction here as it induces a cycle in the dag, which
; is invalid code (there is no correct way to order the instruction). Check
; that we do not fold the load into the sub.
; RUN: llvm-as < %s | llc -march=x86 -disable-pattern-isel=0 | not grep 'sub.*GLOBAL'
%GLOBAL = external global int
int %test(int* %P1, int* %P2, int* %P3) {
%L = load int* %GLOBAL
store int 12, int* %P2
%Y = load int* %P3
%Z = sub int %Y, %L
ret int %Z
}