Add cf asm inline for multiplication commonly used in silk.

Speeds up decoding a 16kbps test file by 4.9MHz on h300.

Change-Id: I8c25431c98dfa9a1c3806a84055e0847eb77a9f1

lib/rbcodec/codecs/libopus/silk/cf/macros_cf.h

@@ -0,0 +1,50 @@
+/***********************************************************************
+Copyright (C) 2013 Xiph.Org Foundation and contributors.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifndef SILK_MACROS_CF_H
+#define SILK_MACROS_CF_H
+
+/* (a32 * (opus_int32)((opus_int16)(b32))) >> 16 output have to be 32bit int */
+#undef silk_SMULWB
+static inline int32_t silk_SMULWB_cf(int32_t a, int16_t b)
+{
+  int32_t r;
+  asm volatile ("mac.l %[a], %[b], %%acc0;"
+                "movclr.l %%acc0, %[r];"
+                : [r] "=r" (r)
+                : [a] "r" (a), [b] "r" (b<<15)
+                : "cc");
+  return r;
+}
+
+#define silk_SMULWB(a, b) (silk_SMULWB_cf(a, b))
+
+/* a32 + (b32 * (opus_int32)((opus_int16)(c32))) >> 16 output have to be 32bit int */
+#undef silk_SMLAWB
+#define silk_SMLAWB(a, b, c) ((a) + silk_SMULWB(b, c))
+
+#endif /* SILK_MACROS_CF_H */

lib/rbcodec/codecs/libopus/silk/macros.h

@@ -108,5 +108,9 @@ static inline opus_int32 silk_CLZ32(opus_int32 in32)
 #include "arm/macros_armv5e.h"
 #endif
 
+#ifdef CF_ASM
+#include "cf/macros_cf.h"
+#endif
+
 #endif /* SILK_MACROS_H */