56 lines · plain
1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py2; RUN: opt < %s -passes=dse -S | FileCheck %s3 4target datalayout = "E-m:e-p:32:32-i64:32-f64:32:64-a:0:32-n32-S32"5 6%struct.ilist = type { i32, ptr }7 8; There is no dead store in this test. Make sure no store is deleted by DSE.9; Test case related to bug report PR52774.10 11define ptr @test() {12; CHECK-LABEL: @test(13; CHECK-NEXT: br label [[LOOP:%.*]]14; CHECK: loop:15; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[TMP0:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]16; CHECK-NEXT: [[LIST_NEXT:%.*]] = phi ptr [ null, [[TMP0]] ], [ [[LIST_NEW_I8_PTR:%.*]], [[LOOP]] ]17; CHECK-NEXT: [[LIST_NEW_I8_PTR]] = tail call align 8 dereferenceable_or_null(8) ptr @malloc(i32 8)18; CHECK-NEXT: store i32 42, ptr [[LIST_NEW_I8_PTR]], align 819; CHECK-NEXT: [[GEP_NEW_NEXT:%.*]] = getelementptr inbounds [[STRUCT_ILIST:%.*]], ptr [[LIST_NEW_I8_PTR]], i32 0, i32 120; CHECK-NEXT: store ptr [[LIST_NEXT]], ptr [[GEP_NEW_NEXT]], align 421; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i32 [[IV]], 122; CHECK-NEXT: [[COND:%.*]] = icmp eq i32 [[IV_NEXT]], 1023; CHECK-NEXT: br i1 [[COND]], label [[EXIT:%.*]], label [[LOOP]]24; CHECK: exit:25; CHECK-NEXT: [[GEP_LIST_LAST_NEXT:%.*]] = getelementptr inbounds [[STRUCT_ILIST]], ptr [[LIST_NEW_I8_PTR]], i32 0, i32 126; CHECK-NEXT: store ptr null, ptr [[GEP_LIST_LAST_NEXT]], align 427; CHECK-NEXT: [[GEP_LIST_NEXT_NEXT:%.*]] = getelementptr inbounds [[STRUCT_ILIST]], ptr [[LIST_NEXT]], i32 0, i32 128; CHECK-NEXT: [[LOADED_PTR:%.*]] = load ptr, ptr [[GEP_LIST_NEXT_NEXT]], align 429; CHECK-NEXT: ret ptr [[LOADED_PTR]]30;31 br label %loop32 33loop:34 %iv = phi i32 [ 0, %0 ], [ %iv.next, %loop ]35 %list.next = phi ptr [ null, %0 ], [ %list.new.i8.ptr, %loop ]36 %list.new.i8.ptr = tail call align 8 dereferenceable_or_null(8) ptr @malloc(i32 8)37 store i32 42, ptr %list.new.i8.ptr, align 838 %gep.new.next = getelementptr inbounds %struct.ilist, ptr %list.new.i8.ptr, i32 0, i32 139 store ptr %list.next, ptr %gep.new.next, align 440 %iv.next = add nuw nsw i32 %iv, 141 %cond = icmp eq i32 %iv.next, 1042 br i1 %cond, label %exit, label %loop43 44exit:45 %gep.list.last.next = getelementptr inbounds %struct.ilist, ptr %list.new.i8.ptr, i32 0, i32 146 store ptr null, ptr %gep.list.last.next, align 447 %gep.list.next.next = getelementptr inbounds %struct.ilist, ptr %list.next, i32 0, i32 148 %loaded_ptr = load ptr, ptr %gep.list.next.next, align 449 ret ptr %loaded_ptr ; use loaded pointer50}51 52; Function Attrs: inaccessiblememonly nounwind53declare noalias noundef align 8 ptr @malloc(i32 noundef) local_unnamed_addr #054 55attributes #0 = { inaccessiblememonly nounwind}56