llvm/test/Transforms/LICM/2003-05-02-LoadHoist.ll
Dan Gohman f2f6ce65b7 Change tests from "opt %s" to "opt < %s" so that opt doesn't see the
input filename so that opt doesn't print the input filename in the
output so that grep lines in the tests don't unintentionally match
strings in the input filename.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81537 91177308-0d34-0410-b5e6-96231b3b80d8
2009-09-11 18:01:28 +00:00

24 lines
685 B
LLVM

; This testcase tests for a problem where LICM hoists loads out of a loop
; despite the fact that calls to unknown functions may modify what is being
; loaded from. Basically if the load gets hoisted, the subtract gets turned
; into a constant zero.
;
; RUN: opt < %s -licm -gvn -instcombine -S | grep load
@X = global i32 7 ; <i32*> [#uses=2]
declare void @foo()
define i32 @test(i1 %c) {
%A = load i32* @X ; <i32> [#uses=1]
br label %Loop
Loop: ; preds = %Loop, %0
call void @foo( )
;; Should not hoist this load!
%B = load i32* @X ; <i32> [#uses=1]
br i1 %c, label %Loop, label %Out
Out: ; preds = %Loop
%C = sub i32 %A, %B ; <i32> [#uses=1]
ret i32 %C
}