aboutsummaryrefslogtreecommitdiff
path: root/vendor/serde_json/src/lexical/rounding.rs
diff options
context:
space:
mode:
authorValentin Popov <valentin@popov.link>2024-07-19 15:37:58 +0300
committerValentin Popov <valentin@popov.link>2024-07-19 15:37:58 +0300
commita990de90fe41456a23e58bd087d2f107d321f3a1 (patch)
tree15afc392522a9e85dc3332235e311b7d39352ea9 /vendor/serde_json/src/lexical/rounding.rs
parent3d48cd3f81164bbfc1a755dc1d4a9a02f98c8ddd (diff)
downloadfparkan-a990de90fe41456a23e58bd087d2f107d321f3a1.tar.xz
fparkan-a990de90fe41456a23e58bd087d2f107d321f3a1.zip
Deleted vendor folder
Diffstat (limited to 'vendor/serde_json/src/lexical/rounding.rs')
-rw-r--r--vendor/serde_json/src/lexical/rounding.rs231
1 files changed, 0 insertions, 231 deletions
diff --git a/vendor/serde_json/src/lexical/rounding.rs b/vendor/serde_json/src/lexical/rounding.rs
deleted file mode 100644
index 6ec1292..0000000
--- a/vendor/serde_json/src/lexical/rounding.rs
+++ /dev/null
@@ -1,231 +0,0 @@
-// Adapted from https://github.com/Alexhuszagh/rust-lexical.
-
-//! Defines rounding schemes for floating-point numbers.
-
-use super::float::ExtendedFloat;
-use super::num::*;
-use super::shift::*;
-use core::mem;
-
-// MASKS
-
-/// Calculate a scalar factor of 2 above the halfway point.
-#[inline]
-pub(crate) fn nth_bit(n: u64) -> u64 {
- let bits: u64 = mem::size_of::<u64>() as u64 * 8;
- debug_assert!(n < bits, "nth_bit() overflow in shl.");
-
- 1 << n
-}
-
-/// Generate a bitwise mask for the lower `n` bits.
-#[inline]
-pub(crate) fn lower_n_mask(n: u64) -> u64 {
- let bits: u64 = mem::size_of::<u64>() as u64 * 8;
- debug_assert!(n <= bits, "lower_n_mask() overflow in shl.");
-
- if n == bits {
- u64::max_value()
- } else {
- (1 << n) - 1
- }
-}
-
-/// Calculate the halfway point for the lower `n` bits.
-#[inline]
-pub(crate) fn lower_n_halfway(n: u64) -> u64 {
- let bits: u64 = mem::size_of::<u64>() as u64 * 8;
- debug_assert!(n <= bits, "lower_n_halfway() overflow in shl.");
-
- if n == 0 {
- 0
- } else {
- nth_bit(n - 1)
- }
-}
-
-/// Calculate a bitwise mask with `n` 1 bits starting at the `bit` position.
-#[inline]
-pub(crate) fn internal_n_mask(bit: u64, n: u64) -> u64 {
- let bits: u64 = mem::size_of::<u64>() as u64 * 8;
- debug_assert!(bit <= bits, "internal_n_halfway() overflow in shl.");
- debug_assert!(n <= bits, "internal_n_halfway() overflow in shl.");
- debug_assert!(bit >= n, "internal_n_halfway() overflow in sub.");
-
- lower_n_mask(bit) ^ lower_n_mask(bit - n)
-}
-
-// NEAREST ROUNDING
-
-// Shift right N-bytes and round to the nearest.
-//
-// Return if we are above halfway and if we are halfway.
-#[inline]
-pub(crate) fn round_nearest(fp: &mut ExtendedFloat, shift: i32) -> (bool, bool) {
- // Extract the truncated bits using mask.
- // Calculate if the value of the truncated bits are either above
- // the mid-way point, or equal to it.
- //
- // For example, for 4 truncated bytes, the mask would be b1111
- // and the midway point would be b1000.
- let mask: u64 = lower_n_mask(shift as u64);
- let halfway: u64 = lower_n_halfway(shift as u64);
-
- let truncated_bits = fp.mant & mask;
- let is_above = truncated_bits > halfway;
- let is_halfway = truncated_bits == halfway;
-
- // Bit shift so the leading bit is in the hidden bit.
- overflowing_shr(fp, shift);
-
- (is_above, is_halfway)
-}
-
-// Tie rounded floating point to event.
-#[inline]
-pub(crate) fn tie_even(fp: &mut ExtendedFloat, is_above: bool, is_halfway: bool) {
- // Extract the last bit after shifting (and determine if it is odd).
- let is_odd = fp.mant & 1 == 1;
-
- // Calculate if we need to roundup.
- // We need to roundup if we are above halfway, or if we are odd
- // and at half-way (need to tie-to-even).
- if is_above || (is_odd && is_halfway) {
- fp.mant += 1;
- }
-}
-
-// Shift right N-bytes and round nearest, tie-to-even.
-//
-// Floating-point arithmetic uses round to nearest, ties to even,
-// which rounds to the nearest value, if the value is halfway in between,
-// round to an even value.
-#[inline]
-pub(crate) fn round_nearest_tie_even(fp: &mut ExtendedFloat, shift: i32) {
- let (is_above, is_halfway) = round_nearest(fp, shift);
- tie_even(fp, is_above, is_halfway);
-}
-
-// DIRECTED ROUNDING
-
-// Shift right N-bytes and round towards a direction.
-//
-// Return if we have any truncated bytes.
-#[inline]
-fn round_toward(fp: &mut ExtendedFloat, shift: i32) -> bool {
- let mask: u64 = lower_n_mask(shift as u64);
- let truncated_bits = fp.mant & mask;
-
- // Bit shift so the leading bit is in the hidden bit.
- overflowing_shr(fp, shift);
-
- truncated_bits != 0
-}
-
-// Round down.
-#[inline]
-fn downard(_: &mut ExtendedFloat, _: bool) {}
-
-// Shift right N-bytes and round toward zero.
-//
-// Floating-point arithmetic defines round toward zero, which rounds
-// towards positive zero.
-#[inline]
-pub(crate) fn round_downward(fp: &mut ExtendedFloat, shift: i32) {
- // Bit shift so the leading bit is in the hidden bit.
- // No rounding schemes, so we just ignore everything else.
- let is_truncated = round_toward(fp, shift);
- downard(fp, is_truncated);
-}
-
-// ROUND TO FLOAT
-
-// Shift the ExtendedFloat fraction to the fraction bits in a native float.
-//
-// Floating-point arithmetic uses round to nearest, ties to even,
-// which rounds to the nearest value, if the value is halfway in between,
-// round to an even value.
-#[inline]
-pub(crate) fn round_to_float<F, Algorithm>(fp: &mut ExtendedFloat, algorithm: Algorithm)
-where
- F: Float,
- Algorithm: FnOnce(&mut ExtendedFloat, i32),
-{
- // Calculate the difference to allow a single calculation
- // rather than a loop, to minimize the number of ops required.
- // This does underflow detection.
- let final_exp = fp.exp + F::DEFAULT_SHIFT;
- if final_exp < F::DENORMAL_EXPONENT {
- // We would end up with a denormal exponent, try to round to more
- // digits. Only shift right if we can avoid zeroing out the value,
- // which requires the exponent diff to be < M::BITS. The value
- // is already normalized, so we shouldn't have any issue zeroing
- // out the value.
- let diff = F::DENORMAL_EXPONENT - fp.exp;
- if diff <= u64::FULL {
- // We can avoid underflow, can get a valid representation.
- algorithm(fp, diff);
- } else {
- // Certain underflow, assign literal 0s.
- fp.mant = 0;
- fp.exp = 0;
- }
- } else {
- algorithm(fp, F::DEFAULT_SHIFT);
- }
-
- if fp.mant & F::CARRY_MASK == F::CARRY_MASK {
- // Roundup carried over to 1 past the hidden bit.
- shr(fp, 1);
- }
-}
-
-// AVOID OVERFLOW/UNDERFLOW
-
-// Avoid overflow for large values, shift left as needed.
-//
-// Shift until a 1-bit is in the hidden bit, if the mantissa is not 0.
-#[inline]
-pub(crate) fn avoid_overflow<F>(fp: &mut ExtendedFloat)
-where
- F: Float,
-{
- // Calculate the difference to allow a single calculation
- // rather than a loop, minimizing the number of ops required.
- if fp.exp >= F::MAX_EXPONENT {
- let diff = fp.exp - F::MAX_EXPONENT;
- if diff <= F::MANTISSA_SIZE {
- // Our overflow mask needs to start at the hidden bit, or at
- // `F::MANTISSA_SIZE+1`, and needs to have `diff+1` bits set,
- // to see if our value overflows.
- let bit = (F::MANTISSA_SIZE + 1) as u64;
- let n = (diff + 1) as u64;
- let mask = internal_n_mask(bit, n);
- if (fp.mant & mask) == 0 {
- // If we have no 1-bit in the hidden-bit position,
- // which is index 0, we need to shift 1.
- let shift = diff + 1;
- shl(fp, shift);
- }
- }
- }
-}
-
-// ROUND TO NATIVE
-
-// Round an extended-precision float to a native float representation.
-#[inline]
-pub(crate) fn round_to_native<F, Algorithm>(fp: &mut ExtendedFloat, algorithm: Algorithm)
-where
- F: Float,
- Algorithm: FnOnce(&mut ExtendedFloat, i32),
-{
- // Shift all the way left, to ensure a consistent representation.
- // The following right-shifts do not work for a non-normalized number.
- fp.normalize();
-
- // Round so the fraction is in a native mantissa representation,
- // and avoid overflow/underflow.
- round_to_float::<F, _>(fp, algorithm);
- avoid_overflow::<F>(fp);
-}