[Opus] Update to v1.2.1

third_party/opus/src/celt/float_cast.h

 /* Copyright (C) 2001 Erik de Castro Lopo <erikd AT mega-nerd DOT com> */
 /*
    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
@@ skipping 43 matching lines @@
 **
 **              long int lrintf (float x) ;
 **              long int lrint  (double x) ;
 */
 
 /*      The presence of the required functions are detected during the configure
 **      process and the values HAVE_LRINT and HAVE_LRINTF are set accordingly in
 **      the config.h file.
 */
 
-#if (HAVE_LRINTF)
+/* With GCC, when SSE is available, the fastest conversion is cvtss2si. */
+#if defined(__GNUC__) && defined(__SSE__)
+
+#include <xmmintrin.h>
+static OPUS_INLINE opus_int32 float2int(float x) {return _mm_cvt_ss2si(_mm_set_ss(x));}
+
+#elif defined(HAVE_LRINTF)
 
 /*      These defines enable functionality introduced with the 1999 ISO C
 **      standard. They must be defined before the inclusion of math.h to
 **      engage them. If optimisation is enabled, these functions will be
 **      inlined. With optimisation switched off, you have to link in the
 **      maths library using -lm.
 */
 
 #define _ISOC9X_SOURCE 1
 #define _ISOC99_SOURCE 1
@@ skipping 56 matching lines @@
 static OPUS_INLINE opus_int16 FLOAT2INT16(float x)
 {
    x = x*CELT_SIG_SCALE;
    x = MAX32(x, -32768);
    x = MIN32(x, 32767);
    return (opus_int16)float2int(x);
 }
 #endif /* DISABLE_FLOAT_API */
 
 #endif /* FLOAT_CAST_H */