1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt < %s -passes=dse -S | FileCheck %s 3 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 8 19; CHECK-NEXT: [[GEP_NEW_NEXT:%.*]] = getelementptr inbounds [[STRUCT_ILIST:%.*]], ptr [[LIST_NEW_I8_PTR]], i32 0, i32 1 20; CHECK-NEXT: store ptr [[LIST_NEXT]], ptr [[GEP_NEW_NEXT]], align 4 21; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1 22; CHECK-NEXT: [[COND:%.*]] = icmp eq i32 [[IV_NEXT]], 10 23; 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 1 26; CHECK-NEXT: store ptr null, ptr [[GEP_LIST_LAST_NEXT]], align 4 27; CHECK-NEXT: [[GEP_LIST_NEXT_NEXT:%.*]] = getelementptr inbounds [[STRUCT_ILIST]], ptr [[LIST_NEXT]], i32 0, i32 1 28; CHECK-NEXT: [[LOADED_PTR:%.*]] = load ptr, ptr [[GEP_LIST_NEXT_NEXT]], align 4 29; CHECK-NEXT: ret ptr [[LOADED_PTR]] 30; 31 br label %loop 32 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 8 38 %gep.new.next = getelementptr inbounds %struct.ilist, ptr %list.new.i8.ptr, i32 0, i32 1 39 store ptr %list.next, ptr %gep.new.next, align 4 40 %iv.next = add nuw nsw i32 %iv, 1 41 %cond = icmp eq i32 %iv.next, 10 42 br i1 %cond, label %exit, label %loop 43 44exit: 45 %gep.list.last.next = getelementptr inbounds %struct.ilist, ptr %list.new.i8.ptr, i32 0, i32 1 46 store ptr null, ptr %gep.list.last.next, align 4 47 %gep.list.next.next = getelementptr inbounds %struct.ilist, ptr %list.next, i32 0, i32 1 48 %loaded_ptr = load ptr, ptr %gep.list.next.next, align 4 49 ret ptr %loaded_ptr ; use loaded pointer 50} 51 52; Function Attrs: inaccessiblememonly nounwind 53declare noalias noundef align 8 ptr @malloc(i32 noundef) local_unnamed_addr #0 54 55attributes #0 = { inaccessiblememonly nounwind} 56