1 files changed, 9 insertions, 22 deletions
diff --git a/numpy/linalg/linalg.py b/numpy/linalg/linalg.py
index 46fb2502e..087156bd0 100644
--- a/numpy/linalg/linalg.py
+++ b/numpy/linalg/linalg.py
@@ -904,34 +904,21 @@ def qr(a, mode='reduced'):
             raise ValueError(f"Unrecognized mode '{mode}'")
 
     a, wrap = _makearray(a)
-    _assert_2d(a)
-    m, n = a.shape
+    _assert_stacked_2d(a)
+    m, n = a.shape[-2:]
     t, result_t = _commonType(a)
-    a = _fastCopyAndTranspose(t, a)
+    a = a.astype(t, copy=True)
     a = _to_native_byte_order(a)
     mn = min(m, n)
-    tau = zeros((mn,), t)
 
-    if isComplexType(t):
-        lapack_routine = lapack_lite.zgeqrf
-        routine_name = 'zgeqrf'
+    if m <= n:
+        gufunc = _umath_linalg.qr_r_raw_e_m
     else:
-        lapack_routine = lapack_lite.dgeqrf
-        routine_name = 'dgeqrf'
+        gufunc = _umath_linalg.qr_r_raw_e_n
 
-    # calculate optimal size of work data 'work'
-    lwork = 1
-    work = zeros((lwork,), t)
-    results = lapack_routine(m, n, a, max(1, m), tau, work, -1, 0)
-    if results['info'] != 0:
-        raise LinAlgError('%s returns %d' % (routine_name, results['info']))
-
-    # do qr decomposition
-    lwork = max(1, n, int(abs(work[0])))
-    work = zeros((lwork,), t)
-    results = lapack_routine(m, n, a, max(1, m), tau, work, lwork, 0)
-    if results['info'] != 0:
-        raise LinAlgError('%s returns %d' % (routine_name, results['info']))
+    signature = 'D->D' if isComplexType(t) else 'd->d'
+    extobj = get_linalg_error_extobj(_raise_linalgerror_lstsq)
+    tau = gufunc(a, signature=signature, extobj=extobj)
 
     # handle modes that don't return q
     if mode == 'r':