Changeset 3574

Timestamp:

07/03/09 03:48:03 (8 months ago)

Author:

sletz

Message:

Another Tim Bechmann memops.c optimization patch.

Files:

• jack2/trunk/jackmp/ChangeLog (modified) (1 diff)
• jack2/trunk/jackmp/common/memops.c (modified) (6 diffs)

jack2/trunk/jackmp/ChangeLog

@@ -26 +26 @@
----------------------------
-
+2009-07-03 Stephane Letz  <letz@grame.fr>
+
+        * Another Tim Bechmann memops.c optimization patch.
+
-2009-07-01 Stephane Letz  <letz@grame.fr>
-

jack2/trunk/jackmp/common/memops.c

@@ -164 +164 @@
-        }
-
+
+#if defined (__SSE2__) && !defined (__sun__)
+
+/* generates same as _mm_set_ps(1.f, 1.f, 1f., 1f) but faster  */
+static inline __m128 gen_one(void)
+{
+    volatile __m128i x;
+    __m128i ones = _mm_cmpeq_epi32(x, x);
+    return (__m128)_mm_slli_epi32 (_mm_srli_epi32(ones, 25), 23);
+}
+
+static inline __m128 clip(__m128 s, __m128 min, __m128 max)
+{
+    return _mm_min_ps(max, _mm_max_ps(s, min));
+}
+
+static inline __m128i float_24_sse(__m128 s)
+{
+    const __m128 upper_bound = gen_one(); /* NORMALIZED_FLOAT_MAX */
+    const __m128 lower_bound = _mm_sub_ps(_mm_setzero_ps(), upper_bound);
+
+    __m128 clipped = clip(s, lower_bound, upper_bound);
+    __m128 scaled = _mm_mul_ps(clipped, _mm_set1_ps(SAMPLE_24BIT_SCALING));
+    return _mm_cvtps_epi32(scaled);
+}
+#endif
-
-/* Linear Congruential noise generator. From the music-dsp list
@@ -255 +281 @@
-                __m128 in = _mm_load_ps(src);
-                __m128 scaled = _mm_mul_ps(in, factor);
-_mm_min_ps(int_max, _mm_max_ps(scaled, int_min)
+clip(scaled, int_min, int_max
-
-                __m128i y = _mm_cvttps_epi32(clipped);
@@ -265 +291 @@
-
-                _mm_store_ss((float*)dst, (__m128)shifted);
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-                src+= 4;
@@ -390 +414 @@
-void sample_move_d24_sS (char *dst, jack_default_audio_sample_t *src, unsigned long nsamples, unsigned long dst_skip, dither_state_t *state)
-{
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-        while (nsamples--) {
-                float_24 (*src, z);
@@ -402 +456 @@
-                src++;
-        }
-      
+
-
-void sample_move_dS_s24s (jack_default_audio_sample_t *dst, char *src, unsigned long nsamples, unsigned long src_skip)
@@ -444 +498 @@
-#if defined (__SSE2__) && !defined (__sun__)
-        const __m128 scaling_block = _mm_set_ps1(scaling);
-
+=
-                int x0, x1, x2, x3;
-