mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-31 07:52:55 +01:00
28 lines
942 B
LLVM
28 lines
942 B
LLVM
; Test that pure functions are cse'd away
|
|
; RUN: opt < %s -globalsmodref-aa -gvn -instcombine -S | FileCheck %s
|
|
|
|
define i32 @pure(i32 %X) {
|
|
%Y = add i32 %X, 1 ; <i32> [#uses=1]
|
|
ret i32 %Y
|
|
}
|
|
|
|
define i32 @test1(i32 %X) {
|
|
; CHECK: %A = call i32 @pure(i32 %X)
|
|
; CHECK-NEXT: ret i32 0
|
|
%A = call i32 @pure( i32 %X ) ; <i32> [#uses=1]
|
|
%B = call i32 @pure( i32 %X ) ; <i32> [#uses=1]
|
|
%C = sub i32 %A, %B ; <i32> [#uses=1]
|
|
ret i32 %C
|
|
}
|
|
|
|
define i32 @test2(i32 %X, i32* %P) {
|
|
; CHECK: %A = call i32 @pure(i32 %X)
|
|
; CHECK-NEXT: store i32 %X, i32* %P
|
|
; CHECK-NEXT: ret i32 0
|
|
%A = call i32 @pure( i32 %X ) ; <i32> [#uses=1]
|
|
store i32 %X, i32* %P ;; Does not invalidate 'pure' call.
|
|
%B = call i32 @pure( i32 %X ) ; <i32> [#uses=1]
|
|
%C = sub i32 %A, %B ; <i32> [#uses=1]
|
|
ret i32 %C
|
|
}
|