llvm-6502/test/CodeGen/X86/2005-01-17-CycleInDAG.ll
Tanya Lattner 6f729d601c Byebye llvm-upgrade!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48762 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-25 04:26:08 +00:00

18 lines
673 B
LLVM

; 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 | not grep sub.*GLOBAL
@GLOBAL = external global i32 ; <i32*> [#uses=1]
define i32 @test(i32* %P1, i32* %P2, i32* %P3) {
%L = load i32* @GLOBAL ; <i32> [#uses=1]
store i32 12, i32* %P2
%Y = load i32* %P3 ; <i32> [#uses=1]
%Z = sub i32 %Y, %L ; <i32> [#uses=1]
ret i32 %Z
}