[FFmpeg-cvslog] tests/checkasm/vp9dsp: Revert first hunk of bddcf758d3a68ac0bcc3bc4fc4aa7156e05245d4

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Thu Sep 24 18:33:11 2015 +0200| [5ba40c3c712fdd44b6eecd5499799fe96225a01b] | committer: Michael Niedermayer

tests/checkasm/vp9dsp: Revert first hunk of bddcf758d3a68ac0bcc3bc4fc4aa7156e05245d4

The change was wrong, also add a comment explaining it

Found-by: BBB
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=5ba40c3c712fdd44b6eecd5499799fe96225a01b
---

 tests/checkasm/vp9dsp.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tests/checkasm/vp9dsp.c b/tests/checkasm/vp9dsp.c
index e94daf3..eb9228a 100644
--- a/tests/checkasm/vp9dsp.c
+++ b/tests/checkasm/vp9dsp.c
@@ -102,7 +102,9 @@ static void check_ipred(void)
             ((uint16_t *)buf0)[(a) + (b) * jstride] = c; \
         } \
     } while (0)
-#define setdx(a,b,c,d) setpx(a,b,(c)-(d)+(rnd()%((d)*2+1)))
+
+// c can be an assignment and must not be put under ()
+#define setdx(a,b,c,d) setpx(a,b,c-(d)+(rnd()%((d)*2+1)))
 #define setsx(a,b,c,d) setdx(a,b,c,(d) << (bit_depth - 8))
 #define randomize_buffers(bidx, lineoff, str) \
     do { \