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wip: use epoch with 512bit chunks

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daanx 2024-12-02 00:31:08 -08:00
parent 1d7a9f62a5
commit 69ac69abac
8 changed files with 574 additions and 256 deletions
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10
src/libc.c
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@ -280,7 +280,7 @@ void _mi_snprintf(char* buf, size_t buflen, const char* fmt, ...) {
// generic trailing and leading zero count
// --------------------------------------------------------
static inline size_t mi_ctz_generic32(uint32_t x) {
uint32_t _mi_ctz_generic32(uint32_t x) {
// de Bruijn multiplication, see <http://supertech.csail.mit.edu/papers/debruijn.pdf>
static const uint8_t debruijn[32] = {
0, 1, 28, 2, 29, 14, 24, 3, 30, 22, 20, 15, 25, 17, 4, 8,
@ -290,7 +290,7 @@ static inline size_t mi_ctz_generic32(uint32_t x) {
return debruijn[((x & -(int32_t)x) * 0x077CB531UL) >> 27];
}
static inline size_t mi_clz_generic32(uint32_t x) {
static size_t mi_clz_generic32(uint32_t x) {
// de Bruijn multiplication, see <http://supertech.csail.mit.edu/papers/debruijn.pdf>
static const uint8_t debruijn[32] = {
31, 22, 30, 21, 18, 10, 29, 2, 20, 17, 15, 13, 9, 6, 28, 1,
@ -319,10 +319,10 @@ size_t _mi_clz_generic(size_t x) {
size_t _mi_ctz_generic(size_t x) {
if (x==0) return MI_SIZE_BITS;
#if (MI_SIZE_BITS <= 32)
return mi_ctz_generic32((uint32_t)x);
return _mi_ctz_generic32((uint32_t)x);
#else
const size_t count = mi_ctz_generic32((uint32_t)x);
const size_t count = _mi_ctz_generic32((uint32_t)x);
if (count < 32) return count;
return (32 + mi_ctz_generic32((uint32_t)(x>>32)));
return (32 + _mi_ctz_generic32((uint32_t)(x>>32)));
#endif
}