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Diffstat (limited to 'vendor/ryu/src/common.rs')
-rw-r--r-- | vendor/ryu/src/common.rs | 95 |
1 files changed, 0 insertions, 95 deletions
diff --git a/vendor/ryu/src/common.rs b/vendor/ryu/src/common.rs deleted file mode 100644 index 9613036..0000000 --- a/vendor/ryu/src/common.rs +++ /dev/null @@ -1,95 +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. - -// Returns the number of decimal digits in v, which must not contain more than 9 -// digits. -#[cfg_attr(feature = "no-panic", inline)] -pub fn decimal_length9(v: u32) -> u32 { - // Function precondition: v is not a 10-digit number. - // (f2s: 9 digits are sufficient for round-tripping.) - debug_assert!(v < 1000000000); - - if v >= 100000000 { - 9 - } else if v >= 10000000 { - 8 - } else if v >= 1000000 { - 7 - } else if v >= 100000 { - 6 - } else if v >= 10000 { - 5 - } else if v >= 1000 { - 4 - } else if v >= 100 { - 3 - } else if v >= 10 { - 2 - } else { - 1 - } -} - -// Returns e == 0 ? 1 : [log_2(5^e)]; requires 0 <= e <= 3528. -#[cfg_attr(feature = "no-panic", inline)] -#[allow(dead_code)] -pub fn log2_pow5(e: i32) -> i32 /* or u32 -> u32 */ { - // This approximation works up to the point that the multiplication - // overflows at e = 3529. If the multiplication were done in 64 bits, it - // would fail at 5^4004 which is just greater than 2^9297. - debug_assert!(e >= 0); - debug_assert!(e <= 3528); - ((e as u32 * 1217359) >> 19) as i32 -} - -// Returns e == 0 ? 1 : ceil(log_2(5^e)); requires 0 <= e <= 3528. -#[cfg_attr(feature = "no-panic", inline)] -pub fn pow5bits(e: i32) -> i32 /* or u32 -> u32 */ { - // This approximation works up to the point that the multiplication - // overflows at e = 3529. If the multiplication were done in 64 bits, it - // would fail at 5^4004 which is just greater than 2^9297. - debug_assert!(e >= 0); - debug_assert!(e <= 3528); - (((e as u32 * 1217359) >> 19) + 1) as i32 -} - -#[cfg_attr(feature = "no-panic", inline)] -#[allow(dead_code)] -pub fn ceil_log2_pow5(e: i32) -> i32 /* or u32 -> u32 */ { - log2_pow5(e) + 1 -} - -// Returns floor(log_10(2^e)); requires 0 <= e <= 1650. -#[cfg_attr(feature = "no-panic", inline)] -pub fn log10_pow2(e: i32) -> u32 /* or u32 -> u32 */ { - // The first value this approximation fails for is 2^1651 which is just greater than 10^297. - debug_assert!(e >= 0); - debug_assert!(e <= 1650); - (e as u32 * 78913) >> 18 -} - -// Returns floor(log_10(5^e)); requires 0 <= e <= 2620. -#[cfg_attr(feature = "no-panic", inline)] -pub fn log10_pow5(e: i32) -> u32 /* or u32 -> u32 */ { - // The first value this approximation fails for is 5^2621 which is just greater than 10^1832. - debug_assert!(e >= 0); - debug_assert!(e <= 2620); - (e as u32 * 732923) >> 20 -} |