1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt -passes=dse -S %s | FileCheck %s 3 4declare void @use_pointer(ptr) 5 6; Out-of-bounds stores can be considered killing any other stores to the same 7; object in the same BB, because they are UB and guaranteed to execute. Note 8; that cases in which the BB is exited through unwinding are handled separately 9; by DSE and the unwinding call will be considered as clobber. 10define i32 @test_out_of_bounds_store_local(i1 %c) { 11; CHECK-LABEL: @test_out_of_bounds_store_local( 12; CHECK-NEXT: [[D:%.*]] = alloca [1 x i32], align 4 13; CHECK-NEXT: [[ARRAYIDX_1:%.*]] = getelementptr inbounds [1 x i32], ptr [[D]], i64 0, i64 1 14; CHECK-NEXT: store i32 20, ptr [[ARRAYIDX_1]], align 4 15; CHECK-NEXT: call void @use_pointer(ptr [[D]]) 16; CHECK-NEXT: ret i32 0 17; 18 %d = alloca [1 x i32], align 4 19 store i32 10, ptr %d, align 4 20 %arrayidx.1 = getelementptr inbounds [1 x i32], ptr %d, i64 0, i64 1 21 store i32 20, ptr %arrayidx.1, align 4 22 call void @use_pointer(ptr %d) 23 ret i32 0 24} 25 26; Similar to @test_out_of_bounds_store_local, but with multiple in-bounds 27; stores to a larger object, followed by an out-of-bounds store. 28; FIXME: the 2 inbounds stores could be removed by applying the same 29; reasoning as for @test_out_of_bounds_store_local. 30define i32 @test_out_of_bounds_store_local_larger_object(i1 %c) { 31; CHECK-LABEL: @test_out_of_bounds_store_local_larger_object( 32; CHECK-NEXT: [[D:%.*]] = alloca [2 x i32], align 4 33; CHECK-NEXT: store i32 10, ptr [[D]], align 4 34; CHECK-NEXT: [[ARRAYIDX_1:%.*]] = getelementptr inbounds [2 x i32], ptr [[D]], i64 0, i64 1 35; CHECK-NEXT: store i32 20, ptr [[ARRAYIDX_1]], align 4 36; CHECK-NEXT: [[ARRAYIDX_2:%.*]] = getelementptr inbounds [2 x i32], ptr [[D]], i64 0, i64 2 37; CHECK-NEXT: store i32 30, ptr [[ARRAYIDX_2]], align 4 38; CHECK-NEXT: call void @use_pointer(ptr [[D]]) 39; CHECK-NEXT: ret i32 0 40; 41 %d = alloca [2 x i32], align 4 42 store i32 10, ptr %d, align 4 43 %arrayidx.1 = getelementptr inbounds [2 x i32], ptr %d, i64 0, i64 1 44 store i32 20, ptr %arrayidx.1, align 4 45 %arrayidx.2 = getelementptr inbounds [2 x i32], ptr %d, i64 0, i64 2 46 store i32 30, ptr %arrayidx.2, align 4 47 call void @use_pointer(ptr %d) 48 ret i32 0 49} 50 51; Make sure that out-of-bound stores are not considered killing other stores to 52; the same underlying object, if they are in different basic blocks. The 53; out-of-bounds store may not be executed. 54; 55; Test case from PR48279. FIXME. 56define i32 @test_out_of_bounds_store_nonlocal(i1 %c) { 57; CHECK-LABEL: @test_out_of_bounds_store_nonlocal( 58; CHECK-NEXT: [[D:%.*]] = alloca [1 x i32], align 4 59; CHECK-NEXT: br label [[FOR_BODY:%.*]] 60; CHECK: for.body: 61; CHECK-NEXT: store i32 10, ptr [[D]], align 4 62; CHECK-NEXT: br label [[FOR_INC:%.*]] 63; CHECK: for.inc: 64; CHECK-NEXT: br i1 [[C:%.*]], label [[FOR_BODY_1:%.*]], label [[FOR_END:%.*]] 65; CHECK: for.body.1: 66; CHECK-NEXT: ret i32 1 67; CHECK: for.end: 68; CHECK-NEXT: call void @use_pointer(ptr [[D]]) 69; CHECK-NEXT: ret i32 0 70; 71 %d = alloca [1 x i32], align 4 72 br label %for.body 73 74for.body: ; preds = %for.cond 75 store i32 10, ptr %d, align 4 76 br label %for.inc 77 78for.inc: ; preds = %for.body 79 br i1 %c, label %for.body.1, label %for.end 80 81for.body.1: ; preds = %for.inc 82 %arrayidx.1 = getelementptr inbounds [1 x i32], ptr %d, i64 0, i64 1 83 store i32 20, ptr %arrayidx.1, align 4 84 ret i32 1 85 86for.end: ; preds = %for.inc 87 call void @use_pointer(ptr %d) 88 ret i32 0 89} 90