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Diffstat (limited to 'vendor/ryu/src/f2s_intrinsics.rs')
-rw-r--r-- | vendor/ryu/src/f2s_intrinsics.rs | 113 |
1 files changed, 0 insertions, 113 deletions
diff --git a/vendor/ryu/src/f2s_intrinsics.rs b/vendor/ryu/src/f2s_intrinsics.rs deleted file mode 100644 index 1a35218..0000000 --- a/vendor/ryu/src/f2s_intrinsics.rs +++ /dev/null @@ -1,113 +0,0 @@ -// Translated from C to Rust. The original C code can be found at -// https://github.com/ulfjack/ryu and carries the following license: -// -// Copyright 2018 Ulf Adams -// -// The contents of this file may be used under the terms of the Apache License, -// Version 2.0. -// -// (See accompanying file LICENSE-Apache or copy at -// http://www.apache.org/licenses/LICENSE-2.0) -// -// Alternatively, the contents of this file may be used under the terms of -// the Boost Software License, Version 1.0. -// (See accompanying file LICENSE-Boost or copy at -// https://www.boost.org/LICENSE_1_0.txt) -// -// Unless required by applicable law or agreed to in writing, this software -// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY -// KIND, either express or implied. - -use crate::d2s; - -pub const FLOAT_POW5_INV_BITCOUNT: i32 = d2s::DOUBLE_POW5_INV_BITCOUNT - 64; -pub const FLOAT_POW5_BITCOUNT: i32 = d2s::DOUBLE_POW5_BITCOUNT - 64; - -#[cfg_attr(feature = "no-panic", inline)] -fn pow5factor_32(mut value: u32) -> u32 { - let mut count = 0u32; - loop { - debug_assert!(value != 0); - let q = value / 5; - let r = value % 5; - if r != 0 { - break; - } - value = q; - count += 1; - } - count -} - -// Returns true if value is divisible by 5^p. -#[cfg_attr(feature = "no-panic", inline)] -pub fn multiple_of_power_of_5_32(value: u32, p: u32) -> bool { - pow5factor_32(value) >= p -} - -// Returns true if value is divisible by 2^p. -#[cfg_attr(feature = "no-panic", inline)] -pub fn multiple_of_power_of_2_32(value: u32, p: u32) -> bool { - // __builtin_ctz doesn't appear to be faster here. - (value & ((1u32 << p) - 1)) == 0 -} - -// It seems to be slightly faster to avoid uint128_t here, although the -// generated code for uint128_t looks slightly nicer. -#[cfg_attr(feature = "no-panic", inline)] -fn mul_shift_32(m: u32, factor: u64, shift: i32) -> u32 { - debug_assert!(shift > 32); - - // The casts here help MSVC to avoid calls to the __allmul library - // function. - let factor_lo = factor as u32; - let factor_hi = (factor >> 32) as u32; - let bits0 = m as u64 * factor_lo as u64; - let bits1 = m as u64 * factor_hi as u64; - - let sum = (bits0 >> 32) + bits1; - let shifted_sum = sum >> (shift - 32); - debug_assert!(shifted_sum <= u32::max_value() as u64); - shifted_sum as u32 -} - -#[cfg_attr(feature = "no-panic", inline)] -pub fn mul_pow5_inv_div_pow2(m: u32, q: u32, j: i32) -> u32 { - #[cfg(feature = "small")] - { - // The inverse multipliers are defined as [2^x / 5^y] + 1; the upper 64 - // bits from the double lookup table are the correct bits for [2^x / - // 5^y], so we have to add 1 here. Note that we rely on the fact that - // the added 1 that's already stored in the table never overflows into - // the upper 64 bits. - let pow5 = unsafe { d2s::compute_inv_pow5(q) }; - mul_shift_32(m, pow5.1 + 1, j) - } - - #[cfg(not(feature = "small"))] - { - debug_assert!(q < d2s::DOUBLE_POW5_INV_SPLIT.len() as u32); - unsafe { - mul_shift_32( - m, - d2s::DOUBLE_POW5_INV_SPLIT.get_unchecked(q as usize).1 + 1, - j, - ) - } - } -} - -#[cfg_attr(feature = "no-panic", inline)] -pub fn mul_pow5_div_pow2(m: u32, i: u32, j: i32) -> u32 { - #[cfg(feature = "small")] - { - let pow5 = unsafe { d2s::compute_pow5(i) }; - mul_shift_32(m, pow5.1, j) - } - - #[cfg(not(feature = "small"))] - { - debug_assert!(i < d2s::DOUBLE_POW5_SPLIT.len() as u32); - unsafe { mul_shift_32(m, d2s::DOUBLE_POW5_SPLIT.get_unchecked(i as usize).1, j) } - } -} |