diff --git a/llvm/test/Transforms/LoopIdiom/memcpy.ll b/llvm/test/Transforms/LoopIdiom/memcpy.ll
new file mode 100644
index 0000000000000..af8dc773c19b3
--- /dev/null
+++ b/llvm/test/Transforms/LoopIdiom/memcpy.ll
@@ -0,0 +1,106 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -basic-aa -loop-idiom < %s -S | FileCheck %s
+
+define void @copy_both_noalias(float* noalias nocapture %d, float* noalias nocapture readonly %s, i64 %sz) {
+; CHECK-LABEL: @copy_both_noalias(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[D1:%.*]] = bitcast float* [[D:%.*]] to i8*
+; CHECK-NEXT:    [[S2:%.*]] = bitcast float* [[S:%.*]] to i8*
+; CHECK-NEXT:    [[EXITCOND_NOT1:%.*]] = icmp eq i64 [[SZ:%.*]], 0
+; CHECK-NEXT:    br i1 [[EXITCOND_NOT1]], label [[FOR_END:%.*]], label [[FOR_BODY_PREHEADER:%.*]]
+; CHECK:       for.body.preheader:
+; CHECK-NEXT:    [[TMP0:%.*]] = shl nuw i64 [[SZ]], 2
+; CHECK-NEXT:    call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 [[D1]], i8* align 4 [[S2]], i64 [[TMP0]], i1 false)
+; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
+; CHECK:       for.body:
+; CHECK-NEXT:    [[I_04:%.*]] = phi i64 [ [[INC:%.*]], [[FOR_BODY]] ], [ 0, [[FOR_BODY_PREHEADER]] ]
+; CHECK-NEXT:    [[D_ADDR_03:%.*]] = phi float* [ [[INCDEC_PTR1:%.*]], [[FOR_BODY]] ], [ [[D]], [[FOR_BODY_PREHEADER]] ]
+; CHECK-NEXT:    [[S_ADDR_02:%.*]] = phi float* [ [[INCDEC_PTR:%.*]], [[FOR_BODY]] ], [ [[S]], [[FOR_BODY_PREHEADER]] ]
+; CHECK-NEXT:    [[INCDEC_PTR]] = getelementptr inbounds float, float* [[S_ADDR_02]], i64 1
+; CHECK-NEXT:    [[TMP1:%.*]] = load float, float* [[S_ADDR_02]], align 4
+; CHECK-NEXT:    [[INCDEC_PTR1]] = getelementptr inbounds float, float* [[D_ADDR_03]], i64 1
+; CHECK-NEXT:    [[INC]] = add i64 [[I_04]], 1
+; CHECK-NEXT:    [[EXITCOND_NOT:%.*]] = icmp eq i64 [[INC]], [[SZ]]
+; CHECK-NEXT:    br i1 [[EXITCOND_NOT]], label [[FOR_END_LOOPEXIT:%.*]], label [[FOR_BODY]]
+; CHECK:       for.end.loopexit:
+; CHECK-NEXT:    br label [[FOR_END]]
+; CHECK:       for.end:
+; CHECK-NEXT:    ret void
+;
+entry:
+  %exitcond.not1 = icmp eq i64 %sz, 0
+  br i1 %exitcond.not1, label %for.end, label %for.body.preheader
+
+for.body.preheader:                               ; preds = %entry
+  br label %for.body
+
+for.body:                                         ; preds = %for.body.preheader, %for.body
+  %i.04 = phi i64 [ %inc, %for.body ], [ 0, %for.body.preheader ]
+  %d.addr.03 = phi float* [ %incdec.ptr1, %for.body ], [ %d, %for.body.preheader ]
+  %s.addr.02 = phi float* [ %incdec.ptr, %for.body ], [ %s, %for.body.preheader ]
+  %incdec.ptr = getelementptr inbounds float, float* %s.addr.02, i64 1
+  %0 = load float, float* %s.addr.02, align 4
+  %incdec.ptr1 = getelementptr inbounds float, float* %d.addr.03, i64 1
+  store float %0, float* %d.addr.03, align 4
+  %inc = add i64 %i.04, 1
+  %exitcond.not = icmp eq i64 %inc, %sz
+  br i1 %exitcond.not, label %for.end.loopexit, label %for.body
+
+for.end.loopexit:                                 ; preds = %for.body
+  br label %for.end
+
+for.end:                                          ; preds = %for.end.loopexit, %entry
+  ret void
+}
+
+define void @copy_one_noalias(float* nocapture %d, float* noalias nocapture readonly %s, i64 %sz) {
+; CHECK-LABEL: @copy_one_noalias(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[D1:%.*]] = bitcast float* [[D:%.*]] to i8*
+; CHECK-NEXT:    [[S2:%.*]] = bitcast float* [[S:%.*]] to i8*
+; CHECK-NEXT:    [[EXITCOND_NOT1:%.*]] = icmp eq i64 [[SZ:%.*]], 0
+; CHECK-NEXT:    br i1 [[EXITCOND_NOT1]], label [[FOR_END:%.*]], label [[FOR_BODY_PREHEADER:%.*]]
+; CHECK:       for.body.preheader:
+; CHECK-NEXT:    [[TMP0:%.*]] = shl nuw i64 [[SZ]], 2
+; CHECK-NEXT:    call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 [[D1]], i8* align 4 [[S2]], i64 [[TMP0]], i1 false)
+; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
+; CHECK:       for.body:
+; CHECK-NEXT:    [[I_04:%.*]] = phi i64 [ [[INC:%.*]], [[FOR_BODY]] ], [ 0, [[FOR_BODY_PREHEADER]] ]
+; CHECK-NEXT:    [[D_ADDR_03:%.*]] = phi float* [ [[INCDEC_PTR1:%.*]], [[FOR_BODY]] ], [ [[D]], [[FOR_BODY_PREHEADER]] ]
+; CHECK-NEXT:    [[S_ADDR_02:%.*]] = phi float* [ [[INCDEC_PTR:%.*]], [[FOR_BODY]] ], [ [[S]], [[FOR_BODY_PREHEADER]] ]
+; CHECK-NEXT:    [[INCDEC_PTR]] = getelementptr inbounds float, float* [[S_ADDR_02]], i64 1
+; CHECK-NEXT:    [[TMP1:%.*]] = load float, float* [[S_ADDR_02]], align 4
+; CHECK-NEXT:    [[INCDEC_PTR1]] = getelementptr inbounds float, float* [[D_ADDR_03]], i64 1
+; CHECK-NEXT:    [[INC]] = add i64 [[I_04]], 1
+; CHECK-NEXT:    [[EXITCOND_NOT:%.*]] = icmp eq i64 [[INC]], [[SZ]]
+; CHECK-NEXT:    br i1 [[EXITCOND_NOT]], label [[FOR_END_LOOPEXIT:%.*]], label [[FOR_BODY]]
+; CHECK:       for.end.loopexit:
+; CHECK-NEXT:    br label [[FOR_END]]
+; CHECK:       for.end:
+; CHECK-NEXT:    ret void
+;
+entry:
+  %exitcond.not1 = icmp eq i64 %sz, 0
+  br i1 %exitcond.not1, label %for.end, label %for.body.preheader
+
+for.body.preheader:                               ; preds = %entry
+  br label %for.body
+
+for.body:                                         ; preds = %for.body.preheader, %for.body
+  %i.04 = phi i64 [ %inc, %for.body ], [ 0, %for.body.preheader ]
+  %d.addr.03 = phi float* [ %incdec.ptr1, %for.body ], [ %d, %for.body.preheader ]
+  %s.addr.02 = phi float* [ %incdec.ptr, %for.body ], [ %s, %for.body.preheader ]
+  %incdec.ptr = getelementptr inbounds float, float* %s.addr.02, i64 1
+  %0 = load float, float* %s.addr.02, align 4
+  %incdec.ptr1 = getelementptr inbounds float, float* %d.addr.03, i64 1
+  store float %0, float* %d.addr.03, align 4
+  %inc = add i64 %i.04, 1
+  %exitcond.not = icmp eq i64 %inc, %sz
+  br i1 %exitcond.not, label %for.end.loopexit, label %for.body
+
+for.end.loopexit:                                 ; preds = %for.body
+  br label %for.end
+
+for.end:                                          ; preds = %for.end.loopexit, %entry
+  ret void
+}