[Bf-blender-cvs] SVN commit: /data/svn/bf-blender [51136] trunk/blender/source/blender/ blenlib/BLI_endian_switch_inline.h: Optimization for endian switching, but shifting is a lot faster then using a temp char ( approx 18x speedup on my system).
Campbell Barton
ideasman42 at gmail.com
Sun Oct 7 06:21:40 CEST 2012
Revision: 51136
http://projects.blender.org/scm/viewvc.php?view=rev&root=bf-blender&revision=51136
Author: campbellbarton
Date: 2012-10-07 04:21:37 +0000 (Sun, 07 Oct 2012)
Log Message:
-----------
Optimization for endian switching, but shifting is a lot faster then using a temp char (approx 18x speedup on my system).
Modified Paths:
--------------
trunk/blender/source/blender/blenlib/BLI_endian_switch_inline.h
Modified: trunk/blender/source/blender/blenlib/BLI_endian_switch_inline.h
===================================================================
--- trunk/blender/source/blender/blenlib/BLI_endian_switch_inline.h 2012-10-07 03:26:30 UTC (rev 51135)
+++ trunk/blender/source/blender/blenlib/BLI_endian_switch_inline.h 2012-10-07 04:21:37 UTC (rev 51136)
@@ -32,85 +32,63 @@
* \ingroup bli
*/
+/* note: using a temp char to switch endian is a lot slower,
+ * use bit shifting instead. */
+/* *** 16 *** */
BLI_INLINE void BLI_endian_switch_int16(short *val)
{
- char *p_i = (char *)val;
- char s_i;
+ short tval = *val;
+ *val = (tval >> 8) |
+ (tval << 8);
- s_i = p_i[0];
- p_i[0] = p_i[1];
- p_i[1] = s_i;
}
-
BLI_INLINE void BLI_endian_switch_uint16(unsigned short *val)
{
- char *p_i = (char *)val;
- char s_i;
-
- s_i = p_i[0];
- p_i[0] = p_i[1];
- p_i[1] = s_i;
+ BLI_endian_switch_int16((short *)val);
}
+
+/* *** 32 *** */
BLI_INLINE void BLI_endian_switch_int32(int *val)
{
- char *p_i = (char *)val;
- char s_i;
+ int tval = *val;
+ *val = ((tval >> 24)) |
+ ((tval << 8) & 0x00ff0000) |
+ ((tval >> 8) & 0x0000ff00) |
+ ((tval << 24));
- s_i = p_i[0]; p_i[0] = p_i[3]; p_i[3] = s_i;
- s_i = p_i[1]; p_i[1] = p_i[2]; p_i[2] = s_i;
}
-
BLI_INLINE void BLI_endian_switch_uint32(unsigned int *val)
{
- char *p_i = (char *)val;
- char s_i;
-
- s_i = p_i[0]; p_i[0] = p_i[3]; p_i[3] = s_i;
- s_i = p_i[1]; p_i[1] = p_i[2]; p_i[2] = s_i;
+ BLI_endian_switch_int32((int *)val);
}
-
BLI_INLINE void BLI_endian_switch_float(float *val)
{
- char *p_i = (char *)val;
- char s_i;
-
- s_i = p_i[0]; p_i[0] = p_i[3]; p_i[3] = s_i;
- s_i = p_i[1]; p_i[1] = p_i[2]; p_i[2] = s_i;
+ BLI_endian_switch_int32((int *)val);
}
+
+/* *** 64 *** */
BLI_INLINE void BLI_endian_switch_int64(int64_t *val)
{
- char *p_i = (char *)val;
- char s_i;
-
- s_i = p_i[0]; p_i[0] = p_i[7]; p_i[7] = s_i;
- s_i = p_i[1]; p_i[1] = p_i[6]; p_i[6] = s_i;
- s_i = p_i[2]; p_i[2] = p_i[5]; p_i[5] = s_i;
- s_i = p_i[3]; p_i[3] = p_i[4]; p_i[4] = s_i;
+ int64_t tval = *val;
+ *val = ((tval >> 56)) |
+ ((tval << 40) & 0x00ff000000000000) |
+ ((tval << 24) & 0x0000ff0000000000) |
+ ((tval << 8) & 0x000000ff00000000) |
+ ((tval >> 8) & 0x00000000ff000000) |
+ ((tval >> 24) & 0x0000000000ff0000) |
+ ((tval >> 40) & 0x000000000000ff00) |
+ ((tval << 56));
}
-
BLI_INLINE void BLI_endian_switch_uint64(uint64_t *val)
{
- char *p_i = (char *)val;
- char s_i;
-
- s_i = p_i[0]; p_i[0] = p_i[7]; p_i[7] = s_i;
- s_i = p_i[1]; p_i[1] = p_i[6]; p_i[6] = s_i;
- s_i = p_i[2]; p_i[2] = p_i[5]; p_i[5] = s_i;
- s_i = p_i[3]; p_i[3] = p_i[4]; p_i[4] = s_i;
+ BLI_endian_switch_int64((int64_t *)val);
}
-
BLI_INLINE void BLI_endian_switch_double(double *val)
{
- char *p_i = (char *)val;
- char s_i;
-
- s_i = p_i[0]; p_i[0] = p_i[7]; p_i[7] = s_i;
- s_i = p_i[1]; p_i[1] = p_i[6]; p_i[6] = s_i;
- s_i = p_i[2]; p_i[2] = p_i[5]; p_i[5] = s_i;
- s_i = p_i[3]; p_i[3] = p_i[4]; p_i[4] = s_i;
+ BLI_endian_switch_int64((int64_t *)val);
}
#endif /* __BLI_ENDIAN_SWITCH_INLINE_H__ */
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