; NOTE: Assertions have been autogenerated by utils/update_test_checks.py ; RUN: opt < %s -passes=dse -S | FileCheck %s ; RUN: opt < %s -aa-pipeline=basic-aa -passes=dse -S | FileCheck %s declare void @use(ptr) define void @test1() { ; CHECK-LABEL: @test1( ; CHECK-NEXT: [[A:%.*]] = alloca i64, align 8 ; CHECK-NEXT: call void @use(ptr [[A]]) ; CHECK-NEXT: [[PTR2:%.*]] = getelementptr i8, ptr [[A]], i32 1 ; CHECK-NEXT: store i8 10, ptr [[A]], align 1 ; CHECK-NEXT: store i8 20, ptr [[PTR2]], align 1 ; CHECK-NEXT: [[LV:%.*]] = load i64, ptr [[A]], align 4 ; CHECK-NEXT: store i8 0, ptr [[A]], align 1 ; CHECK-NEXT: call void @use(ptr [[A]]) ; CHECK-NEXT: ret void ; %a = alloca i64 call void @use(ptr %a) %ptr2 = getelementptr i8, ptr %a, i32 1 store i8 10, ptr %a store i8 20, ptr %ptr2 %lv = load i64, ptr %a store i8 0, ptr %a call void @use(ptr %a) ret void } define void @test2() { ; CHECK-LABEL: @test2( ; CHECK-NEXT: [[A:%.*]] = alloca i64, align 8 ; CHECK-NEXT: call void @use(ptr [[A]]) ; CHECK-NEXT: [[PTR2:%.*]] = getelementptr i8, ptr [[A]], i32 1 ; CHECK-NEXT: store i8 10, ptr [[A]], align 1 ; CHECK-NEXT: store i8 20, ptr [[PTR2]], align 1 ; CHECK-NEXT: br i1 undef, label [[BB1:%.*]], label [[END:%.*]] ; CHECK: bb1: ; CHECK-NEXT: [[LV:%.*]] = load i64, ptr [[A]], align 4 ; CHECK-NEXT: br label [[END]] ; CHECK: end: ; CHECK-NEXT: store i8 0, ptr [[A]], align 1 ; CHECK-NEXT: call void @use(ptr [[A]]) ; CHECK-NEXT: ret void ; %a = alloca i64 call void @use(ptr %a) %ptr2 = getelementptr i8, ptr %a, i32 1 store i8 10, ptr %a store i8 20, ptr %ptr2 br i1 undef, label %bb1, label %end bb1: %lv = load i64, ptr %a br label %end end: store i8 0, ptr %a call void @use(ptr %a) ret void } ; The store to %a0 is dead, because only %a1 is read later. define void @test3(i1 %c) { ; CHECK-LABEL: @test3( ; CHECK-NEXT: [[A:%.*]] = alloca [2 x i8], align 1 ; CHECK-NEXT: [[A1:%.*]] = getelementptr [2 x i8], ptr [[A]], i32 0, i32 1 ; CHECK-NEXT: br i1 [[C:%.*]], label [[IF:%.*]], label [[ELSE:%.*]] ; CHECK: if: ; CHECK-NEXT: store [2 x i8] zeroinitializer, ptr [[A]], align 1 ; CHECK-NEXT: br label [[ELSE]] ; CHECK: else: ; CHECK-NEXT: [[TMP1:%.*]] = load i8, ptr [[A1]], align 1 ; CHECK-NEXT: ret void ; %a = alloca [2 x i8] %a1 = getelementptr [2 x i8], ptr %a, i32 0, i32 1 store i8 1, ptr %a br i1 %c, label %if, label %else if: store [2 x i8] zeroinitializer, ptr %a br label %else else: load i8, ptr %a1 ret void } ; Variation on the previous test case, where only the store to %a is dead, ; but not the one to %a1. This tests for a potential caching bug. define void @test4(i1 %c) { ; CHECK-LABEL: @test4( ; CHECK-NEXT: [[A:%.*]] = alloca [2 x i8], align 1 ; CHECK-NEXT: [[A1:%.*]] = getelementptr [2 x i8], ptr [[A]], i32 0, i32 1 ; CHECK-NEXT: store i8 1, ptr [[A1]], align 1 ; CHECK-NEXT: br i1 [[C:%.*]], label [[IF:%.*]], label [[ELSE:%.*]] ; CHECK: if: ; CHECK-NEXT: store [2 x i8] zeroinitializer, ptr [[A]], align 1 ; CHECK-NEXT: br label [[ELSE]] ; CHECK: else: ; CHECK-NEXT: [[TMP1:%.*]] = load i8, ptr [[A1]], align 1 ; CHECK-NEXT: ret void ; %a = alloca [2 x i8] %a1 = getelementptr [2 x i8], ptr %a, i32 0, i32 1 store i8 1, ptr %a1 store i8 1, ptr %a br i1 %c, label %if, label %else if: store [2 x i8] zeroinitializer, ptr %a br label %else else: load i8, ptr %a1 ret void }