forked from OSchip/llvm-project
59 lines
2.3 KiB
LLVM
59 lines
2.3 KiB
LLVM
; Test that LICM uses basicaa to do alias analysis, which is capable of
|
|
; disambiguating some obvious cases. If LICM is able to disambiguate the
|
|
; two pointers, then the load should be hoisted, and the store sunk.
|
|
|
|
; RUN: opt < %s -basicaa -licm -enable-mssa-loop-dependency=false -S | FileCheck %s -check-prefixes=CHECK,AST
|
|
; RUN: opt < %s -basicaa -licm -enable-mssa-loop-dependency=true -S | FileCheck %s -check-prefixes=CHECK,MSSA
|
|
target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
|
|
|
|
@A = global i32 7 ; <i32*> [#uses=3]
|
|
@B = global i32 8 ; <i32*> [#uses=2]
|
|
@C = global [2 x i32] [ i32 4, i32 8 ] ; <[2 x i32]*> [#uses=2]
|
|
|
|
define i32 @test1(i1 %c) {
|
|
%Atmp = load i32, i32* @A ; <i32> [#uses=2]
|
|
br label %Loop
|
|
|
|
Loop: ; preds = %Loop, %0
|
|
%ToRemove = load i32, i32* @A ; <i32> [#uses=1]
|
|
store i32 %Atmp, i32* @B
|
|
br i1 %c, label %Out, label %Loop
|
|
|
|
Out: ; preds = %Loop
|
|
%X = sub i32 %ToRemove, %Atmp ; <i32> [#uses=1]
|
|
ret i32 %X
|
|
|
|
; The Loop block should be empty after the load/store are promoted.
|
|
; CHECK: @test1
|
|
; CHECK: load i32, i32* @A
|
|
; MSSA: load i32, i32* @A
|
|
; MSSA: store i32 %Atmp, i32* @B
|
|
; CHECK: Loop:
|
|
; CHECK-NEXT: br i1 %c, label %Out, label %Loop
|
|
; CHECK: Out:
|
|
; AST: store i32 %Atmp, i32* @B
|
|
; AST: load i32, i32* @A
|
|
}
|
|
|
|
define i32 @test2(i1 %c) {
|
|
br label %Loop
|
|
|
|
Loop: ; preds = %Loop, %0
|
|
%AVal = load i32, i32* @A ; <i32> [#uses=2]
|
|
%C0 = getelementptr [2 x i32], [2 x i32]* @C, i64 0, i64 0 ; <i32*> [#uses=1]
|
|
store i32 %AVal, i32* %C0
|
|
%BVal = load i32, i32* @B ; <i32> [#uses=2]
|
|
%C1 = getelementptr [2 x i32], [2 x i32]* @C, i64 0, i64 1 ; <i32*> [#uses=1]
|
|
store i32 %BVal, i32* %C1
|
|
br i1 %c, label %Out, label %Loop
|
|
|
|
Out: ; preds = %Loop
|
|
%X = sub i32 %AVal, %BVal ; <i32> [#uses=1]
|
|
ret i32 %X
|
|
; The Loop block should be empty after the load/store are promoted.
|
|
; CHECK: @test2
|
|
; CHECK: Loop:
|
|
; CHECK-NEXT: br i1 %c, label %Out, label %Loop
|
|
}
|
|
|