summaryrefslogtreecommitdiff
path: root/attic/muse_qt4_evolution/al/dspXMM.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'attic/muse_qt4_evolution/al/dspXMM.cpp')
-rw-r--r--attic/muse_qt4_evolution/al/dspXMM.cpp115
1 files changed, 115 insertions, 0 deletions
diff --git a/attic/muse_qt4_evolution/al/dspXMM.cpp b/attic/muse_qt4_evolution/al/dspXMM.cpp
new file mode 100644
index 00000000..1943fa7d
--- /dev/null
+++ b/attic/muse_qt4_evolution/al/dspXMM.cpp
@@ -0,0 +1,115 @@
+/*
+ Copyright (C) 2007 Paul sDavis
+ Written by Sampo Savolainen
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include <xmmintrin.h>
+
+void
+x86_sse_find_peaks(float *buf, unsigned nframes, float *min, float *max)
+{
+ __m128 current_max, current_min, work;
+
+ // Load max and min values into all four slots of the XMM registers
+ current_min = _mm_set1_ps(*min);
+ current_max = _mm_set1_ps(*max);
+
+ // Work input until "buf" reaches 16 byte alignment
+ while ( ((unsigned long)buf) % 16 != 0 && nframes > 0) {
+
+ // Load the next float into the work buffer
+ work = _mm_set1_ps(*buf);
+
+ current_min = _mm_min_ps(current_min, work);
+ current_max = _mm_max_ps(current_max, work);
+
+ buf++;
+ nframes--;
+ }
+
+ // use 64 byte prefetch for quadruple quads
+ while (nframes >= 16) {
+ __builtin_prefetch(buf+64,0,0);
+
+ work = _mm_load_ps(buf);
+ current_min = _mm_min_ps(current_min, work);
+ current_max = _mm_max_ps(current_max, work);
+ buf+=4;
+ work = _mm_load_ps(buf);
+ current_min = _mm_min_ps(current_min, work);
+ current_max = _mm_max_ps(current_max, work);
+ buf+=4;
+ work = _mm_load_ps(buf);
+ current_min = _mm_min_ps(current_min, work);
+ current_max = _mm_max_ps(current_max, work);
+ buf+=4;
+ work = _mm_load_ps(buf);
+ current_min = _mm_min_ps(current_min, work);
+ current_max = _mm_max_ps(current_max, work);
+ buf+=4;
+ nframes-=16;
+ }
+
+ // work through aligned buffers
+ while (nframes >= 4) {
+
+ work = _mm_load_ps(buf);
+
+ current_min = _mm_min_ps(current_min, work);
+ current_max = _mm_max_ps(current_max, work);
+
+ buf+=4;
+ nframes-=4;
+ }
+
+ // work through the rest < 4 samples
+ while ( nframes > 0) {
+
+ // Load the next float into the work buffer
+ work = _mm_set1_ps(*buf);
+
+ current_min = _mm_min_ps(current_min, work);
+ current_max = _mm_max_ps(current_max, work);
+
+ buf++;
+ nframes--;
+ }
+
+ // Find min & max value in current_max through shuffle tricks
+
+ work = current_min;
+ work = _mm_shuffle_ps(work, work, _MM_SHUFFLE(2, 3, 0, 1));
+ work = _mm_min_ps (work, current_min);
+ current_min = work;
+ work = _mm_shuffle_ps(work, work, _MM_SHUFFLE(1, 0, 3, 2));
+ work = _mm_min_ps (work, current_min);
+
+ _mm_store_ss(min, work);
+
+ work = current_max;
+ work = _mm_shuffle_ps(work, work, _MM_SHUFFLE(2, 3, 0, 1));
+ work = _mm_max_ps (work, current_max);
+ current_max = work;
+ work = _mm_shuffle_ps(work, work, _MM_SHUFFLE(1, 0, 3, 2));
+ work = _mm_max_ps (work, current_max);
+
+ _mm_store_ss(max, work);
+}
+
+
+