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 -basicaa -licm -S | FileCheck %s 6 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" 7 8 @A = global i32 7 ; <i32*> [#uses=3] 9 @B = global i32 8 ; <i32*> [#uses=2] 10 @C = global [2 x i32] [ i32 4, i32 8 ] ; <[2 x i32]*> [#uses=2] 11 12 define i32 @test1(i1 %c) { 13 %Atmp = load i32* @A ; <i32> [#uses=2] 14 br label %Loop 15 16 Loop: ; preds = %Loop, %0 17 %ToRemove = load i32* @A ; <i32> [#uses=1] 18 store i32 %Atmp, i32* @B 19 br i1 %c, label %Out, label %Loop 20 21 Out: ; 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* @A 28 ; CHECK: Loop: 29 ; CHECK-NEXT: br i1 %c, label %Out, label %Loop 30 ; CHECK: Out: 31 ; CHECK: store i32 %Atmp, i32* @B 32 } 33 34 define i32 @test2(i1 %c) { 35 br label %Loop 36 37 Loop: ; preds = %Loop, %0 38 %AVal = load i32* @A ; <i32> [#uses=2] 39 %C0 = getelementptr [2 x i32]* @C, i64 0, i64 0 ; <i32*> [#uses=1] 40 store i32 %AVal, i32* %C0 41 %BVal = load i32* @B ; <i32> [#uses=2] 42 %C1 = getelementptr [2 x i32]* @C, i64 0, i64 1 ; <i32*> [#uses=1] 43 store i32 %BVal, i32* %C1 44 br i1 %c, label %Out, label %Loop 45 46 Out: ; preds = %Loop 47 %X = sub i32 %AVal, %BVal ; <i32> [#uses=1] 48 ret i32 %X 49 ; The Loop block should be empty after the load/store are promoted. 50 ; CHECK: @test2 51 ; CHECK: Loop: 52 ; CHECK-NEXT: br i1 %c, label %Out, label %Loop 53 } 54 55
