ref: 23f9ebdf1a385e01b365598527c0a59458a4c99d
parent: a5652e854199c29a6c06493515d20b0cb939a173
author: Chris Moeller <kode54@gmail.com>
date: Fri Oct 4 06:15:00 EDT 2013
Implemented automatic detection of SSE support
--- a/dumb/src/it/itrender.c
+++ b/dumb/src/it/itrender.c
@@ -787,11 +787,62 @@
#undef LOG10
-int _dumb_it_use_sse = 0;
+#ifdef _USE_SSE
+#if defined(_M_IX86) || defined(__i386__)
+#ifdef _MSC_VER
+#include <intrin.h>
+#else
+static inline void
+__cpuid(int *data, int selector)
+{
+ asm("cpuid"
+ : "=a" (data[0]),
+ "=b" (data[1]),
+ "=c" (data[2]),
+ "=d" (data[3])
+ : "a"(selector));
+}
+#endif
+
+static int query_cpu_feature_sse() {
+ int buffer[4];
+ __cpuid(buffer,1);
+ if ((buffer[3]&(1<<25)) == 0) return 0;
+ return 1;
+}
+
+static int _dumb_it_use_sse = 0;
+
+void _dumb_init_sse()
+{
+ static int initialized = 0;
+ if (!initialized)
+ {
+ _dumb_it_use_sse = query_cpu_feature_sse();
+ initialized = 1;
+ }
+}
+
+#elif defined(_M_X64) || defined(__amd64__)
+
+static const int _dumb_it_use_sse = 1;
+
+void _dumb_init_sse() { }
+
+#else
+
+static const int _dumb_it_use_sse = 0;
+
+void _dumb_init_sse() { }
+
+#endif
+#endif
+
static void it_filter(DUMB_CLICK_REMOVER *cr, IT_FILTER_STATE *state, sample_t *dst, long pos, sample_t *src, long size, int step, int sampfreq, int cutoff, int resonance)
{
#if defined(_USE_SSE)
+ _dumb_init_sse();
if ( _dumb_it_use_sse ) it_filter_sse( cr, state, dst, pos, src, size, step, sampfreq, cutoff, resonance );
else
#endif