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ref: 5c22224e9e43befc414cce2cf163616c9d56b0d3
parent: 26a0721268cfbb921f8b2320ccecab2c3d8982f2
author: Peter de Rivaz <peter.derivaz@gmail.com>
date: Thu Dec 11 10:54:23 EST 2014

Corrected optimization of 8x8 DCT code

The 8x8 DCT uses a fast version whenever possible.
There was a mistake in the checking code which
meant sometimes the fast version was used when it
was not safe to do so.

Change-Id: I154c84c9e2d836764768a11082947ca30f4b5ab7
(cherry picked from commit fd05fb0c21e253b4d6f92d7e0b752850ff8ab188)

--- a/vp9/common/x86/vp9_idct_intrin_sse2.c

+++ b/vp9/common/x86/vp9_idct_intrin_sse2.c

@@ -4260,7 +4260,7 @@

     // N.B. Only first 4 cols contain non-zero coeffs

     max_input = _mm_max_epi16(inptr[0], inptr[1]);

     min_input = _mm_min_epi16(inptr[0], inptr[1]);

-    for (i = 2; i < 4; i++) {

+    for (i = 2; i < 8; i++) {

       max_input = _mm_max_epi16(max_input, inptr[i]);

       min_input = _mm_min_epi16(min_input, inptr[i]);

     }