opus: asm MULT16_32_Q15 for arm and cf

Speeds up decoding of a 64kbps opus test file by 34MHz on h300 (cf),
24MHz on c200 (pp) and 13MHz on fuzev1 (amsv1)

Change-Id: I0dce6b3bfe6c81d0a722dfebb13891b9a428c6ba

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/rbcodec/codecs/opus.c b/lib/rbcodec/codecs/opus.c
index 19bdb8daae..cf2d69738f 100644
--- a/lib/rbcodec/codecs/opus.c
+++ b/lib/rbcodec/codecs/opus.c
@@ -332,6 +332,12 @@ enum codec_status codec_run(void)
     }
     global_stack = 0;
 
+#if defined(CPU_COLDFIRE)
+    /* EMAC rounding is disabled because of MULT16_32_Q15, which will be
+       inaccurate with rounding in its current incarnation */
+    coldfire_set_macsr(EMAC_FRACTIONAL | EMAC_SATURATE);
+#endif
+
     /* pre-init the ogg_sync_state buffer, so it won't need many reallocs */
     ogg_sync_init(&oy);
     oy.storage = 64*1024;