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Speed up interpreter with gcc CLZ intrinsic.

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This commit is contained in:
C. Guy Yarvin 2014-08-22 02:14:37 -04:00
parent 868ed7d758
commit 549ff28b41
1 changed files with 5 additions and 1 deletions
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6
include/c/defs.h
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@ -17,8 +17,11 @@
*/
# define c3_wiseof(x) (((sizeof (x)) + 3) >> 2)
/* Bits in byte.
/* Bit counting.
*/
#if 1
# define c3_bits_word(w) ((w) ? (32 - __builtin_clz(w)) : 0)
#else
#ifdef C3_GLOBAL
c3_y Bts_y[] = {
0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,
@ -50,6 +53,7 @@
: ((w) >> 8) \
? (8 + Bts_y[(w) >> 8]) \
: Bts_y[(w)] )
#endif
/* Min and max.
*/