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* try to fix precision error on x86 platform step9.

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This commit is contained in:
IRainman 2025-11-08 22:28:40 +03:00
parent 97aa629922
commit 3e498bb3b1
3 changed files with 5 additions and 5 deletions
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2
include/fast_float/ascii_number.h
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@ -439,7 +439,7 @@ parse_number_string(UC const *p, UC const *pend,
} else { } else {
// Now let's parse the explicit exponent. // Now let's parse the explicit exponent.
while ((p != pend) && is_integer(*p)) { while ((p != pend) && is_integer(*p)) {
if (exp_number < 0x10000000) { if (exp_number < 0x10000) {
// check for exponent overflow if we have too many digits. // check for exponent overflow if we have too many digits.
UC const digit = UC(*p - UC('0')); UC const digit = UC(*p - UC('0'));
exp_number = 10 * exp_number + static_cast<am_pow_t>(digit); exp_number = 10 * exp_number + static_cast<am_pow_t>(digit);

6
include/fast_float/decimal_to_binary.h
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@ -139,9 +139,9 @@ compute_float(int64_t q, uint64_t w) noexcept {
// branchless approach: value128 product = compute_product(q, w); but in // branchless approach: value128 product = compute_product(q, w); but in
// practice, we can win big with the compute_product_approximation if its // practice, we can win big with the compute_product_approximation if its
// additional branch is easily predicted. Which is best is data specific. // additional branch is easily predicted. Which is best is data specific.
am_pow_t const upperbit = am_pow_t(product.high >> 63); limb_t const upperbit = limb_t(product.high >> 63);
am_pow_t const shift = limb_t const shift =
am_pow_t(upperbit + 64 - binary::mantissa_explicit_bits() - 3); limb_t(upperbit + 64 - binary::mantissa_explicit_bits() - 3);
answer.mantissa = product.high >> shift; answer.mantissa = product.high >> shift;

2
include/fast_float/float_common.h
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@ -446,7 +446,7 @@ typedef int_fast8_t am_bits_t;
// Power bias is signed for handling a denormal float // Power bias is signed for handling a denormal float
// or an invalid mantissa. // or an invalid mantissa.
typedef int_fast32_t am_pow_t; typedef int_fast16_t am_pow_t;
// Bias so we can get the real exponent with an invalid adjusted_mantissa. // Bias so we can get the real exponent with an invalid adjusted_mantissa.
constexpr static am_pow_t invalid_am_bias = -0x8000; constexpr static am_pow_t invalid_am_bias = -0x8000;