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Tweak for 32-bit Windows

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This commit is contained in:
Daniel Lemire 2021-06-07 09:14:09 -04:00
parent 496fd4cf49
commit f54b41c09e
1 changed files with 5 additions and 7 deletions
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12
include/fast_float/float_common.h
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@ -129,23 +129,21 @@ fastfloat_really_inline int leading_zeroes(uint64_t input_num) {
#ifdef FASTFLOAT_32BIT
#if (!defined(_WIN32)) || defined(__MINGW32__)
// slow emulation routine for 32-bit
fastfloat_really_inline uint64_t __emulu(uint32_t x, uint32_t y) {
fastfloat_really_inline uint64_t emulu(uint32_t x, uint32_t y) {
return x * (uint64_t)y;
}
#endif
// slow emulation routine for 32-bit
#if !defined(__MINGW64__)
fastfloat_really_inline uint64_t _umul128(uint64_t ab, uint64_t cd,
uint64_t *hi) {
uint64_t ad = __emulu((uint32_t)(ab >> 32), (uint32_t)cd);
uint64_t bd = __emulu((uint32_t)ab, (uint32_t)cd);
uint64_t adbc = ad + __emulu((uint32_t)ab, (uint32_t)(cd >> 32));
uint64_t ad = emulu((uint32_t)(ab >> 32), (uint32_t)cd);
uint64_t bd = emulu((uint32_t)ab, (uint32_t)cd);
uint64_t adbc = ad + emulu((uint32_t)ab, (uint32_t)(cd >> 32));
uint64_t adbc_carry = !!(adbc < ad);
uint64_t lo = bd + (adbc << 32);
*hi = __emulu((uint32_t)(ab >> 32), (uint32_t)(cd >> 32)) + (adbc >> 32) +
*hi = emulu((uint32_t)(ab >> 32), (uint32_t)(cd >> 32)) + (adbc >> 32) +
(adbc_carry << 32) + !!(lo < bd);
return lo;
}