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Optimization for endian switching, but shifting is a lot faster then using a temp char (approx 18x speedup on my system).

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This commit is contained in:
Campbell Barton
2012-10-07 04:21:37 +00:00
parent d5de816a15
commit a17e39476c
1 changed files with 29 additions and 51 deletions
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80
source/blender/blenlib/BLI_endian_switch_inline.h
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@@ -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__ */