1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt -S -passes=memcpyopt < %s | FileCheck %s 3 4; The memcpy here is *not* dead, because it reads memory written in a previous 5; loop iteration. 6 7define void @test(i1 %c, ptr nocapture noundef readonly %path, ptr noundef writeonly %name) { 8; CHECK-LABEL: @test( 9; CHECK-NEXT: entry: 10; CHECK-NEXT: [[TMP:%.*]] = alloca [260 x i8], align 16 11; CHECK-NEXT: br label [[WHILE_BODY:%.*]] 12; CHECK: while.body: 13; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[WHILE_BODY]] ], [ 259, [[ENTRY:%.*]] ] 14; CHECK-NEXT: [[IV_NEXT]] = add nsw i64 [[IV]], -1 15; CHECK-NEXT: [[TMP_IV:%.*]] = getelementptr inbounds [260 x i8], ptr [[TMP]], i64 0, i64 [[IV]] 16; CHECK-NEXT: store i8 42, ptr [[TMP_IV]], align 1 17; CHECK-NEXT: br i1 [[C:%.*]], label [[WHILE_BODY]], label [[EXIT:%.*]] 18; CHECK: exit: 19; CHECK-NEXT: [[TMP_IV_1:%.*]] = getelementptr inbounds i8, ptr [[TMP_IV]], i64 1 20; CHECK-NEXT: [[LEN:%.*]] = sub nsw i64 259, [[IV]] 21; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i64(ptr align 1 [[NAME:%.*]], ptr nonnull align 1 [[TMP_IV_1]], i64 [[LEN]], i1 false) 22; CHECK-NEXT: ret void 23; 24entry: 25 %tmp = alloca [260 x i8], align 16 26 br label %while.body 27 28while.body: 29 %iv = phi i64 [ %iv.next, %while.body ], [ 259, %entry ] 30 %iv.next = add nsw i64 %iv, -1 31 %tmp.iv = getelementptr inbounds [260 x i8], ptr %tmp, i64 0, i64 %iv 32 store i8 42, ptr %tmp.iv, align 1 33 br i1 %c, label %while.body, label %exit 34 35exit: 36 %tmp.iv.1 = getelementptr inbounds i8, ptr %tmp.iv, i64 1 37 %len = sub nsw i64 259, %iv 38 call void @llvm.memcpy.p0.p0.i64(ptr align 1 %name, ptr nonnull align 1 %tmp.iv.1, i64 %len, i1 false) 39 ret void 40} 41 42declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly %0, ptr noalias nocapture readonly %1, i64 %2, i1 immarg %3) 43