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Fix compilation with TinyCC

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This commit is contained in:
Anton Kochkov 2020-09-27 16:49:17 +08:00
parent 135c630e92
commit 3eee1d5376
2 changed files with 31 additions and 2 deletions
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15
lib/src/bits.h
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@ -7,7 +7,20 @@ static inline uint32_t bitmask_for_index(uint16_t id) {
return (1u << (31 - id));
}
#if defined _WIN32 && !defined __GNUC__
#ifdef __TINYC__
// Algorithm taken from the Hacker's Delight book
// See also https://graphics.stanford.edu/~seander/bithacks.html
static inline uint32_t count_leading_zeros(uint32_t x) {
int count = 0;
if (x == 0) return 32;
x = x - ((x >> 1) & 0x55555555);
x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
count = (((x + (x >> 4)) & 0x0f0f0f0f) * 0x01010101) >> 24;
return count;
}
#elif defined _WIN32 && !defined __GNUC__
#include <intrin.h>