diff options
| author | Denys Vlasenko | 2020-12-21 07:22:26 +0100 |
|---|---|---|
| committer | Denys Vlasenko | 2020-12-21 07:22:55 +0100 |
| commit | 3e544d6ec778fd1f9c4e425e279660fa6f66c3ac (patch) | |
| tree | 692668f89c39feb811d65ec750c97d428d2fbda3 /coreutils | |
| parent | f079f913711091c87557a4c7854385c408e4ab7c (diff) | |
| download | busybox-3e544d6ec778fd1f9c4e425e279660fa6f66c3ac.zip busybox-3e544d6ec778fd1f9c4e425e279660fa6f66c3ac.tar.gz | |
factor: code shrink
function old new delta
factor_main 176 171 -5
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'coreutils')
| -rw-r--r-- | coreutils/factor.c | 17 |
1 files changed, 8 insertions, 9 deletions
diff --git a/coreutils/factor.c b/coreutils/factor.c index 30498c7..1f9a13f 100644 --- a/coreutils/factor.c +++ b/coreutils/factor.c @@ -49,12 +49,11 @@ typedef unsigned long half_t; * (adding just one prime, 13, results in 5766 element sieve). */ #define R(a,b,c,d,e,f,g,h,i,j,A,B,C,D,E,F,G,H,I,J) \ - (((uint64_t)(a<<0) | (b<<3) | (c<<6) | (d<<9) | (e<<12) | (f<<15) | (g<<18) | (h<<21) | (i<<24) | (j<<27)) ) | \ - (((uint64_t)(A<<0) | (B<<3) | (C<<6) | (D<<9) | (E<<12) | (F<<15) | (G<<18) | (H<<21) | (I<<24) | (J<<27)) << 30) | \ - (((uint64_t)7 << 60)) + (((uint64_t)(a<<0) | (b<<3) | (c<<6) | (d<<9) | (e<<12) | (f<<15) | (g<<18) | (h<<21) | (i<<24) | (j<<27)) << 1) | \ + (((uint64_t)(A<<0) | (B<<3) | (C<<6) | (D<<9) | (E<<12) | (F<<15) | (G<<18) | (H<<21) | (I<<24) | (J<<27)) << 31) #define P(a,b,c,d,e,f,g,h,i,j,A,B,C,D,E,F,G,H,I,J) \ - R( (a/2-1),(b/2-1),(c/2-1),(d/2-1),(e/2-1),(f/2-1),(g/2-1),(h/2-1),(i/2-1),(j/2-1), \ - (A/2-1),(B/2-1),(C/2-1),(D/2-1),(E/2-1),(F/2-1),(G/2-1),(H/2-1),(I/2-1),(J/2-1) ) + R( (a/2),(b/2),(c/2),(d/2),(e/2),(f/2),(g/2),(h/2),(i/2),(j/2), \ + (A/2),(B/2),(C/2),(D/2),(E/2),(F/2),(G/2),(H/2),(I/2),(J/2) ) static const uint64_t packed_wheel[] = { /*1, 2, 2, 4, 2,*/ P( 4, 2, 4, 6, 2, 6, 4, 2, 4, 6, 6, 2, 6, 4, 2, 6, 4, 6, 8, 4), //01 @@ -94,7 +93,7 @@ static const uint64_t packed_wheel[] = { * wheel_tab - 485 +485 * 3-bit-packed insanity: * packed_wheel - 192 +192 - * factor_main 108 176 +68 + * factor_main 108 176 +63 */ static void unpack_wheel(void) { @@ -110,12 +109,12 @@ static void unpack_wheel(void) p = &wheel_tab[5]; for (i = 0; i < ARRAY_SIZE(packed_wheel); i++) { uint64_t v = packed_wheel[i]; - do { - *p = ((unsigned)(v & 7) + 1) * 2; + while ((v & 0xe) != 0) { + *p = v & 0xe; //printf("%2u,", *p); p++; v >>= 3; - } while ((unsigned)v != 7); + } //printf("\n"); } } |