blob: 8bcc8adcbd1f1e1b524cb57d9b3df95386771fd7 [file] [log] [blame]
; 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 -passes='loop-mssa(licm),gvn,instcombine' -S | grep load
@X = global i32 7 ; <ptr> [#uses=2]
declare void @foo()
define i32 @test(i1 %c) {
%A = load i32, ptr @X ; <i32> [#uses=1]
br label %Loop
Loop: ; preds = %Loop, %0
call void @foo( )
;; Should not hoist this load!
%B = load i32, ptr @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