[vlc-devel] commit: Fixed undenormalise for 64 bits. (Laurent Aimar )

[git version control]

vlc | branch: master | Laurent Aimar <fenrir at videolan.org> | Sat Jul 19 22:39:48 2008 +0200| [8400d104d4236612af4b31ea1852383dcfe31c7f]

Fixed undenormalise for 64 bits.

> http://git.videolan.org/gitweb.cgi/vlc.git/?a=commit;h=8400d104d4236612af4b31ea1852383dcfe31c7f
---

 modules/audio_filter/spatializer/allpass.hpp |    3 +--
 modules/audio_filter/spatializer/comb.hpp    |    8 +++-----
 modules/audio_filter/spatializer/denormals.h |   12 ++++++++++--
 3 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/modules/audio_filter/spatializer/allpass.hpp b/modules/audio_filter/spatializer/allpass.hpp
index f907667..5a5a85f 100644
--- a/modules/audio_filter/spatializer/allpass.hpp
+++ b/modules/audio_filter/spatializer/allpass.hpp
@@ -32,8 +32,7 @@ inline float allpass::process(float input)
     float output;
     float bufout;
 
-    bufout = buffer[bufidx];
-    undenormalise(bufout);
+    bufout = undenormalise( buffer[bufidx] );
 
     output = -input + bufout;
     buffer[bufidx] = input + (bufout*feedback);
diff --git a/modules/audio_filter/spatializer/comb.hpp b/modules/audio_filter/spatializer/comb.hpp
index 2da83db..8d35e90 100644
--- a/modules/audio_filter/spatializer/comb.hpp
+++ b/modules/audio_filter/spatializer/comb.hpp
@@ -37,13 +37,11 @@ inline float comb::process(float input)
 {
     float output;
 
-    output = buffer[bufidx];
-    undenormalise(output);
+    output = undenormalise( buffer[bufidx] );
 
-    filterstore = (output*damp2) + (filterstore*damp1);
-    undenormalise(filterstore);
+    filterstore = undenormalise( output*damp2 + filterstore*damp1 );
 
-    buffer[bufidx] = input + (filterstore*feedback);
+    buffer[bufidx] = input + filterstore*feedback;
 
     if(++bufidx>=bufsize) bufidx = 0;
 
diff --git a/modules/audio_filter/spatializer/denormals.h b/modules/audio_filter/spatializer/denormals.h
index f871412..bab45c6 100644
--- a/modules/audio_filter/spatializer/denormals.h
+++ b/modules/audio_filter/spatializer/denormals.h
@@ -8,8 +8,16 @@
 #ifndef _denormals_
 #define _denormals_
 
-#define undenormalise(sample) if(((*(unsigned int*)&sample)&0x7f800000)==0) sample=0.0f
+#include <stdint.h>
+
+static inline float undenormalise( float f )
+{
+    union { float f; uint32_t u; } data;
+    data.f = f;
+    if( (data.u & 0x7f800000) == 0 )
+        return 0.0;
+    return f;
+}
 
 #endif//_denormals_
 
-//ends