1; Test that LICM uses basicaa to do alias analysis, which is capable of 2; disambiguating some obvious cases. If LICM is able to disambiguate the 3; two pointers, then the load should be hoisted, and the store sunk. 4 5; RUN: opt < %s -aa-pipeline=basic-aa -passes='loop-mssa(licm)' -S | FileCheck %s 6target 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" 7 8@A = global i32 7 ; <ptr> [#uses=3] 9@B = global i32 8 ; <ptr> [#uses=2] 10@C = global [2 x i32] [ i32 4, i32 8 ] ; <ptr> [#uses=2] 11 12define i32 @test1(i1 %c) { 13 %Atmp = load i32, ptr @A ; <i32> [#uses=2] 14 br label %Loop 15 16Loop: ; preds = %Loop, %0 17 %ToRemove = load i32, ptr @A ; <i32> [#uses=1] 18 store i32 %Atmp, ptr @B 19 br i1 %c, label %Out, label %Loop 20 21Out: ; preds = %Loop 22 %X = sub i32 %ToRemove, %Atmp ; <i32> [#uses=1] 23 ret i32 %X 24 25; The Loop block should be empty after the load/store are promoted. 26; CHECK: @test1 27; CHECK: load i32, ptr @A 28; CHECK: load i32, ptr @A 29; CHECK: store i32 %Atmp, ptr @B 30; CHECK: Loop: 31; CHECK-NEXT: br i1 %c, label %Out, label %Loop 32; CHECK: Out: 33} 34 35define i32 @test2(i1 %c) { 36 br label %Loop 37 38Loop: ; preds = %Loop, %0 39 %AVal = load i32, ptr @A ; <i32> [#uses=2] 40 %C0 = getelementptr [2 x i32], ptr @C, i64 0, i64 0 ; <ptr> [#uses=1] 41 store i32 %AVal, ptr %C0 42 %BVal = load i32, ptr @B ; <i32> [#uses=2] 43 %C1 = getelementptr [2 x i32], ptr @C, i64 0, i64 1 ; <ptr> [#uses=1] 44 store i32 %BVal, ptr %C1 45 br i1 %c, label %Out, label %Loop 46 47Out: ; preds = %Loop 48 %X = sub i32 %AVal, %BVal ; <i32> [#uses=1] 49 ret i32 %X 50; The Loop block should be empty after the load/store are promoted. 51; CHECK: @test2 52; CHECK: Loop: 53; CHECK-NEXT: br i1 %c, label %Out, label %Loop 54} 55 56