; NOTE: Assertions have been autogenerated by utils/update_test_checks.py ; RUN: opt < %s -passes=dse -S | FileCheck %s target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64" define void @test2(ptr noalias %P) { ; CHECK-LABEL: @test2( ; CHECK-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]] ; CHECK: bb1: ; CHECK-NEXT: br label [[BB3:%.*]] ; CHECK: bb2: ; CHECK-NEXT: br label [[BB3]] ; CHECK: bb3: ; CHECK-NEXT: store i32 0, ptr [[P:%.*]], align 4 ; CHECK-NEXT: ret void ; store i32 1, ptr %P br i1 true, label %bb1, label %bb2 bb1: br label %bb3 bb2: br label %bb3 bb3: store i32 0, ptr %P ret void } define void @test3(ptr noalias %P) { ; CHECK-LABEL: @test3( ; CHECK-NEXT: store i32 0, ptr [[P:%.*]], align 4 ; CHECK-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]] ; CHECK: bb1: ; CHECK-NEXT: br label [[BB3:%.*]] ; CHECK: bb2: ; CHECK-NEXT: store i32 1, ptr [[P]], align 4 ; CHECK-NEXT: br label [[BB3]] ; CHECK: bb3: ; CHECK-NEXT: ret void ; store i32 0, ptr %P br i1 true, label %bb1, label %bb2 bb1: br label %bb3 bb2: store i32 1, ptr %P br label %bb3 bb3: ret void } define void @test7(ptr noalias %P, ptr noalias %Q) { ; CHECK-LABEL: @test7( ; CHECK-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]] ; CHECK: bb1: ; CHECK-NEXT: [[TMP1:%.*]] = load i32, ptr [[P:%.*]], align 4 ; CHECK-NEXT: br label [[BB3:%.*]] ; CHECK: bb2: ; CHECK-NEXT: br label [[BB3]] ; CHECK: bb3: ; CHECK-NEXT: store i32 0, ptr [[Q:%.*]], align 4 ; CHECK-NEXT: store i32 0, ptr [[P]], align 4 ; CHECK-NEXT: ret void ; store i32 1, ptr %Q br i1 true, label %bb1, label %bb2 bb1: load i32, ptr %P br label %bb3 bb2: br label %bb3 bb3: store i32 0, ptr %Q store i32 0, ptr %P ret void } define i32 @test22(ptr %P, ptr noalias %Q, ptr %R) { ; CHECK-LABEL: @test22( ; CHECK-NEXT: store i32 2, ptr [[P:%.*]], align 4 ; CHECK-NEXT: store i32 3, ptr [[Q:%.*]], align 4 ; CHECK-NEXT: [[L:%.*]] = load i32, ptr [[R:%.*]], align 4 ; CHECK-NEXT: ret i32 [[L]] ; store i32 1, ptr %Q store i32 2, ptr %P store i32 3, ptr %Q %l = load i32, ptr %R ret i32 %l } define void @test9(ptr noalias %P) { ; CHECK-LABEL: @test9( ; CHECK-NEXT: store i32 0, ptr [[P:%.*]], align 4 ; CHECK-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]] ; CHECK: bb1: ; CHECK-NEXT: br label [[BB3:%.*]] ; CHECK: bb2: ; CHECK-NEXT: ret void ; CHECK: bb3: ; CHECK-NEXT: store i32 1, ptr [[P]], align 4 ; CHECK-NEXT: ret void ; store i32 0, ptr %P br i1 true, label %bb1, label %bb2 bb1: br label %bb3 bb2: ret void bb3: store i32 1, ptr %P ret void } ; We cannot eliminate `store i32 0, ptr %P`, as it is read by the later load. ; Make sure that we check the uses of `store i32 1, ptr %P.1 which does not ; alias %P. Note that uses point to the *first* def that may alias. define void @overlapping_read(ptr %P) { ; CHECK-LABEL: @overlapping_read( ; CHECK-NEXT: store i32 0, ptr [[P:%.*]], align 4 ; CHECK-NEXT: [[P_1:%.*]] = getelementptr i32, ptr [[P]], i32 1 ; CHECK-NEXT: store i32 1, ptr [[P_1]], align 4 ; CHECK-NEXT: [[LV:%.*]] = load i64, ptr [[P]], align 8 ; CHECK-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]] ; CHECK: bb1: ; CHECK-NEXT: br label [[BB3:%.*]] ; CHECK: bb2: ; CHECK-NEXT: br label [[BB3]] ; CHECK: bb3: ; CHECK-NEXT: store i32 2, ptr [[P]], align 4 ; CHECK-NEXT: ret void ; store i32 0, ptr %P %P.1 = getelementptr i32, ptr %P, i32 1 store i32 1, ptr %P.1 %lv = load i64, ptr %P br i1 true, label %bb1, label %bb2 bb1: br label %bb3 bb2: br label %bb3 bb3: store i32 2, ptr %P ret void } define void @test10(ptr %P) { ; CHECK-LABEL: @test10( ; CHECK-NEXT: store i32 0, ptr [[P:%.*]], align 4 ; CHECK-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]] ; CHECK: bb1: ; CHECK-NEXT: store i32 1, ptr [[P]], align 4 ; CHECK-NEXT: br label [[BB3:%.*]] ; CHECK: bb2: ; CHECK-NEXT: ret void ; CHECK: bb3: ; CHECK-NEXT: ret void ; store i32 0, ptr %P br i1 true, label %bb1, label %bb2 bb1: store i32 1, ptr %P br label %bb3 bb2: ret void bb3: ret void } define void @test11() { ; CHECK-LABEL: @test11( ; CHECK-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]] ; CHECK: bb1: ; CHECK-NEXT: br label [[BB3:%.*]] ; CHECK: bb2: ; CHECK-NEXT: ret void ; CHECK: bb3: ; CHECK-NEXT: ret void ; %P = alloca i32 store i32 0, ptr %P br i1 true, label %bb1, label %bb2 bb1: store i32 0, ptr %P br label %bb3 bb2: ret void bb3: ret void } define void @test12(ptr %P) { ; CHECK-LABEL: @test12( ; CHECK-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]] ; CHECK: bb1: ; CHECK-NEXT: store i32 1, ptr [[P:%.*]], align 4 ; CHECK-NEXT: br label [[BB3:%.*]] ; CHECK: bb2: ; CHECK-NEXT: store i32 1, ptr [[P]], align 4 ; CHECK-NEXT: ret void ; CHECK: bb3: ; CHECK-NEXT: ret void ; store i32 0, ptr %P br i1 true, label %bb1, label %bb2 bb1: store i32 1, ptr %P br label %bb3 bb2: store i32 1, ptr %P ret void bb3: ret void } define void @test13(ptr %P) { ; CHECK-LABEL: @test13( ; CHECK-NEXT: br i1 true, label [[BB1:%.*]], label [[BB2:%.*]] ; CHECK: bb1: ; CHECK-NEXT: store i32 1, ptr [[P:%.*]], align 4 ; CHECK-NEXT: br label [[BB3:%.*]] ; CHECK: bb2: ; CHECK-NEXT: store i32 1, ptr [[P]], align 4 ; CHECK-NEXT: br label [[BB3]] ; CHECK: bb3: ; CHECK-NEXT: ret void ; store i32 0, ptr %P br i1 true, label %bb1, label %bb2 bb1: store i32 1, ptr %P br label %bb3 bb2: store i32 1, ptr %P br label %bb3 bb3: ret void }