| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt < %s -passes=instcombine -S | FileCheck %s |
| |
| ; Memcpy is copying known-undef, and is thus removable |
| define void @test(i8* %dest) { |
| ; CHECK-LABEL: @test( |
| ; CHECK-NEXT: ret void |
| ; |
| %a = alloca [7 x i8] |
| %src = getelementptr inbounds [7 x i8], [7 x i8]* %a, i64 0, i64 0 |
| call void @llvm.memcpy.p0i8.p0i8.i64(i8* %dest, i8* %src, i64 7, i1 false) |
| ret void |
| } |
| |
| ; Some non-undef elements |
| define void @test2(i8* %dest) { |
| ; CHECK-LABEL: @test2( |
| ; CHECK-NEXT: [[A:%.*]] = alloca [7 x i8], align 1 |
| ; CHECK-NEXT: [[SRC:%.*]] = getelementptr inbounds [7 x i8], [7 x i8]* [[A]], i64 0, i64 0 |
| ; CHECK-NEXT: store i8 0, i8* [[SRC]], align 1 |
| ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* noundef nonnull align 1 dereferenceable(7) [[DEST:%.*]], i8* noundef nonnull align 1 dereferenceable(7) [[SRC]], i64 7, i1 false) |
| ; CHECK-NEXT: ret void |
| ; |
| %a = alloca [7 x i8] |
| %src = getelementptr inbounds [7 x i8], [7 x i8]* %a, i64 0, i64 0 |
| store i8 0, i8* %src |
| call void @llvm.memcpy.p0i8.p0i8.i64(i8* %dest, i8* %src, i64 7, i1 false) |
| ret void |
| } |
| |
| ; Volatile write is still required |
| define void @test3(i8* %dest) { |
| ; CHECK-LABEL: @test3( |
| ; CHECK-NEXT: [[A:%.*]] = alloca [7 x i8], align 1 |
| ; CHECK-NEXT: [[SRC:%.*]] = getelementptr inbounds [7 x i8], [7 x i8]* [[A]], i64 0, i64 0 |
| ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* [[DEST:%.*]], i8* [[SRC]], i64 7, i1 true) |
| ; CHECK-NEXT: ret void |
| ; |
| %a = alloca [7 x i8] |
| %src = getelementptr inbounds [7 x i8], [7 x i8]* %a, i64 0, i64 0 |
| call void @llvm.memcpy.p0i8.p0i8.i64(i8* %dest, i8* %src, i64 7, i1 true) |
| ret void |
| } |
| |
| define void @test4(i8* %dest) { |
| ; CHECK-LABEL: @test4( |
| ; CHECK-NEXT: ret void |
| ; |
| %a = alloca [7 x i8] |
| %src = bitcast [7 x i8]* %a to i8* |
| call void @llvm.memcpy.p0i8.p0i8.i64(i8* %dest, i8* %src, i64 7, i1 false) |
| ret void |
| } |
| |
| define void @test5(i8* %dest) { |
| ; CHECK-LABEL: @test5( |
| ; CHECK-NEXT: ret void |
| ; |
| %a = alloca [7 x i8] |
| %p1 = bitcast [7 x i8]* %a to i32* |
| %p2 = getelementptr i32, i32* %p1, i32 1 |
| %src = bitcast i32* %p2 to i8* |
| call void @llvm.memcpy.p0i8.p0i8.i64(i8* %dest, i8* %src, i64 3, i1 false) |
| ret void |
| } |
| |
| define void @test6(i8* %dest) { |
| ; CHECK-LABEL: @test6( |
| ; CHECK-NEXT: [[A:%.*]] = alloca [7 x i8], align 1 |
| ; CHECK-NEXT: [[P2:%.*]] = getelementptr inbounds [7 x i8], [7 x i8]* [[A]], i64 0, i64 2 |
| ; CHECK-NEXT: [[TMP1:%.*]] = bitcast i8* [[P2]] to i16* |
| ; CHECK-NEXT: store i16 42, i16* [[TMP1]], align 2 |
| ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* noundef nonnull align 1 dereferenceable(7) [[DEST:%.*]], i8* noundef nonnull align 1 dereferenceable(7) [[P2]], i64 7, i1 false) |
| ; CHECK-NEXT: ret void |
| ; |
| %a = alloca [7 x i8] |
| %p1 = bitcast [7 x i8]* %a to i16* |
| %p2 = getelementptr i16, i16* %p1, i32 1 |
| store i16 42, i16* %p2 |
| %src = bitcast i16* %p2 to i8* |
| call void @llvm.memcpy.p0i8.p0i8.i64(i8* %dest, i8* %src, i64 7, i1 false) |
| ret void |
| } |
| |
| declare void @llvm.memcpy.p0i8.p0i8.i64(i8*, i8*, i64, i1) |