| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt -S -memcpyopt < %s | FileCheck %s |
| |
| ; The memcpy here is *not* dead, because it reads memory written in a previous |
| ; loop iteration. |
| |
| define void @test(i1 %c, i8* nocapture noundef readonly %path, i8* noundef writeonly %name) { |
| ; CHECK-LABEL: @test( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: [[TMP:%.*]] = alloca [260 x i8], align 16 |
| ; CHECK-NEXT: br label [[WHILE_BODY:%.*]] |
| ; CHECK: while.body: |
| ; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[WHILE_BODY]] ], [ 259, [[ENTRY:%.*]] ] |
| ; CHECK-NEXT: [[IV_NEXT]] = add nsw i64 [[IV]], -1 |
| ; CHECK-NEXT: [[TMP_IV:%.*]] = getelementptr inbounds [260 x i8], [260 x i8]* [[TMP]], i64 0, i64 [[IV]] |
| ; CHECK-NEXT: store i8 42, i8* [[TMP_IV]], align 1 |
| ; CHECK-NEXT: br i1 [[C:%.*]], label [[WHILE_BODY]], label [[EXIT:%.*]] |
| ; CHECK: exit: |
| ; CHECK-NEXT: [[TMP_IV_1:%.*]] = getelementptr inbounds i8, i8* [[TMP_IV]], i64 1 |
| ; CHECK-NEXT: [[LEN:%.*]] = sub nsw i64 259, [[IV]] |
| ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 [[NAME:%.*]], i8* nonnull align 1 [[TMP_IV_1]], i64 [[LEN]], i1 false) |
| ; CHECK-NEXT: ret void |
| ; |
| entry: |
| %tmp = alloca [260 x i8], align 16 |
| br label %while.body |
| |
| while.body: |
| %iv = phi i64 [ %iv.next, %while.body ], [ 259, %entry ] |
| %iv.next = add nsw i64 %iv, -1 |
| %tmp.iv = getelementptr inbounds [260 x i8], [260 x i8]* %tmp, i64 0, i64 %iv |
| store i8 42, i8* %tmp.iv, align 1 |
| br i1 %c, label %while.body, label %exit |
| |
| exit: |
| %tmp.iv.1 = getelementptr inbounds i8, i8* %tmp.iv, i64 1 |
| %len = sub nsw i64 259, %iv |
| call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 %name, i8* nonnull align 1 %tmp.iv.1, i64 %len, i1 false) |
| ret void |
| } |
| |
| declare void @llvm.memcpy.p0i8.p0i8.i64(i8* noalias nocapture writeonly %0, i8* noalias nocapture readonly %1, i64 %2, i1 immarg %3) |
