ref: cd159fd1ec8ae64e6cd1b69854034560b5f1c419
parent: 9f7e502e0683bfbf8bfe9ba48220df27c258bf9e
author: Jean-Marc Valin <[email protected]>
date: Fri Aug 12 22:53:12 EDT 2016
Making gcc use SSE directly for float->int conversion when available
--- a/celt/float_cast.h
+++ b/celt/float_cast.h
@@ -61,7 +61,13 @@
** 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