mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-17 21:29:20 +00:00
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48527 91177308-0d34-0410-b5e6-96231b3b80d8
24 lines
713 B
LLVM
24 lines
713 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: llvm-as < %s | opt -licm -load-vn -gcse -instcombine | llvm-dis | 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
|
|
}
|