From a6379b61b29b38ef55b7f3126c95614d404bd58d Mon Sep 17 00:00:00 2001
From: Joris Van den Bossche <jorisvandenbossche@gmail.com>
Date: Mon, 21 Sep 2015 00:22:48 +0200
Subject: [PATCH] PERF: compare freq strings in extract_ordinals (GH11084)

freq attribute changed to return Offset object instead of string,
making this comparison much slower
---
 pandas/src/period.pyx | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pandas/src/period.pyx b/pandas/src/period.pyx
index 1dbf469a946b5..2a7c2135f8045 100644
--- a/pandas/src/period.pyx
+++ b/pandas/src/period.pyx
@@ -439,10 +439,12 @@ def extract_ordinals(ndarray[object] values, freq):
         ndarray[int64_t] ordinals = np.empty(n, dtype=np.int64)
         object p
 
+    freqstr = Period._maybe_convert_freq(freq).freqstr
+
     for i in range(n):
         p = values[i]
         ordinals[i] = p.ordinal
-        if p.freq != freq:
+        if p.freqstr != freqstr:
             raise ValueError("%s is wrong freq" % p)
 
     return ordinals