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Author SHA1 Message Date
Roy Ivy III
a6d7379b97
Merge pull request #1563 from nbraud/factor/faster/gcd 
factor/perf ~ speed up factor::numeric::gcd
 2020-07-25 11:07:57 -05:00
nicoo
6bef6306c0 factor::numeric::gcd: Avoid redundant u64::trailing_zeros and shifts 
7 to 10% faster, according to criterion.
 2020-07-25 15:04:57 +02:00
nicoo
3e55139c13 factor::miller_rabbin::Result: Mark as #[must_use] 
Ignoring a value of that type is a bug: they are only produced by
`miller_rabbin::test`, which is a pure, but expensive, function.

As such, an ignored value is always either a mistake, or an easy
optimisation opportunity (just remove the useless call to `test`).
 2020-07-24 23:06:08 +02:00
nicoo
ecc3e2db24 factor::miller_rabin::test: Minor readability improvement 2020-07-24 23:06:08 +02:00
nicoo
e415b17c01 factor::miller_rabin: Remove duplicated work 
The duplicate work was introduced in 2015.
 2020-07-24 23:06:06 +02:00
nicoo
29d45e472d factor::numeric::gcd: Implement Stein's binary GCD algorithm 
Also add a property-based test against the Euclidean implementation.

numeric::gcd got ~50-65% faster, according to criterion. The effect on the
overall system is small, but later PRs will use a lot more GCD computations.
 2020-07-24 23:00:32 +02:00
nicoo
4f23767b85 factor::numeric::gcd: Add criterion-powered benchmark 
The function had to be made `pub`, this is a [known limitation] of Criterion.

[known limitation]: https://bheisler.github.io/criterion.rs/book/user_guide/known_limitations.html
 2020-07-24 22:58:26 +02:00
nicoo
1b593d94c9 factor: Update rand dependency to v0.7 2020-07-24 22:57:08 +02:00
nicoo
9a80ab7741 factor::numeric::DoubleInt: Document the DoubleWidth associated type 2020-07-24 11:28:26 -05:00
nicoo
17c69674eb factor::numeric::Int: Remove from_u128 method 
It was unused, the debug assertions only need `to_u128`.
 2020-07-24 11:28:26 -05:00
nicoo
1172af09c0 factor::numeric::DoubleInt: Clarify methods and associated types 
- `DoubleInt::Double` renamed to `DoubleWidth`
- `{as,from}_double()` renamed to `{as,from}_double_width()`.

This should hopefully clarify that this is not a “double precision”
floating-point type, but an integer type with a larger range (used
for storing intermediate results, typ. from a multiplication)
 2020-07-24 11:28:26 -05:00
nicoo
86a4749e3a factor::numeric: fix original "Generalise modular inverse computation" 2020-07-24 11:28:12 -05:00
nicoo
6e228d3184 Merge branches 'factor/faster/{centralise_logic, montgomery32}' 2020-07-05 00:20:16 +02:00
nicoo
4cfe754551 factor::miller_rabin::is_prime: Fix bug 
Montgomery only works for odd n, so attempting to construct an instance
for an even number results in a panic!

The most obvious solution is to special-case even numbers.
 2020-07-05 00:08:49 +02:00
nicoo
9b0f131135 Fix bug in factor::factor::factor (>_>") 
Non-prime numbers, such as 0 or 1, shouldn't be inserted in the factorisation.
 2020-07-05 00:07:38 +02:00
nicoo
e9e263ac66 factor::Factors: Derive Clone and Debug 
Useful for printing out in-progress factorisations when debugging.
 2020-07-05 00:07:33 +02:00
nicoo
7bdc81b882 factor: Add a first property-based test 2020-07-05 00:07:16 +02:00
nicoo
dcc22188ba factor: Fix clippy warnings 2020-07-05 00:05:45 +02:00
nicoo
f1d1cb80e4 factor::Factors: Generalise invariant check (from prime() to add()) 2020-07-05 00:05:45 +02:00
nicoo
2d2b6faab4 factor: Avoid moving data around in main factoring loop 
Instead, the same `Factors` object is passed around through the execution.
~10% faster.
 2020-07-05 00:05:45 +02:00
nicoo
6713d2ad62 factor: Move recursive factoring logic from rho to factor 
No functional change, but prepares a coming optimisation.
 2020-07-05 00:05:45 +02:00
nicoo
bd4d6fcac5 factor: Split the CLI and I/O code off the factoring logic 2020-07-05 00:05:45 +02:00
nicoo
6256750376 factor::miller_rabin: Use a macro to instantiate every test 2020-07-05 00:04:56 +02:00
nicoo
7a1b86c9c2 factor::numeric::tests: Use a macro to instantiate every test 2020-07-05 00:04:53 +02:00
nicoo
cbcc760f83 factor::miller_rabin: Squash another bug! >:3 
Detected by the testsuite improvement just prior.
 2020-07-05 00:04:49 +02:00
nicoo
3d6fdffe14 factor::miller_rabin: Generalise tests to 32 and 64b Montgomery 2020-07-05 00:04:29 +02:00
nicoo
9b149a759b factor::miller_rabin: Hoist edge-cases (even, <2) out of test() 
test() takes a modulus that is known to not be even or <2 (otherwise the
Montgomery value could not be constructed), so those checks can be hoisted
into is_prime() and out of the critical path.
 2020-07-05 00:04:26 +02:00
nicoo
4f08e28167 factor::miller_rabin: Add property-based test 2020-07-05 00:04:08 +02:00
nicoo
d2fa0fe63c factor::miller_rabin::tests: small_composites → small_semiprimes 
This is more descriptive, as semiprime are the products of 2 primes;
all semiprimes are composite, but not all composite numbers are semiprime.
 2020-07-05 00:01:48 +02:00
nicoo
1e4d824829 factor::miller_rabin: Add negative test over all small composites 2020-07-05 00:01:44 +02:00
nicoo
600268c6e4 factor::miller_rabin::tests: Refactor 2020-07-05 00:01:40 +02:00
nicoo
0a1200bdb8 factor::miller_rabin: Add test for the largest 64b composite numbers 2020-07-05 00:01:37 +02:00
nicoo
308290325a factor::miller_rabin::is_prime: Fix bug 
Montgomery<_> only works for odd n, so attempting to construct an instance
for an even number results in a panic!

The most obvious solution is to special-case even numbers.
 2020-07-05 00:01:33 +02:00
nicoo
d2b43f49f9 factor::numeric::OverflowingAdd: Generate impls with a macro 2020-07-05 00:01:21 +02:00
nicoo
b25c77c5f9 factor::numeric: Generate implementations of DoubleInt with a macro 2020-07-05 00:01:21 +02:00
nicoo
f95f977f98 factor::numeric: Generate implementations of Int with a macro 2020-07-05 00:01:21 +02:00
nicoo
53954badd7 factor::numeric: Refactor away the use of {To,From}Primitives 2020-07-05 00:01:21 +02:00
nicoo
19a8231fb2 factor::numeric::Arithmetic: Rename associated type I to ModInt 2020-07-05 00:01:21 +02:00
nicoo
caa79a1261 factor::numeric: Split Int and DoubleInt traits 2020-07-05 00:01:21 +02:00
nicoo
28244413d1 factor::numeric: Document when to remove OverflowingAdd trait 2020-07-05 00:01:21 +02:00
nicoo
3f79be0219 factor::numeric: Use debug_assert! for runtime assertions. 2020-07-05 00:01:21 +02:00
nicoo
774feb0a40 factor::numeric: Generalise tests for Arithmetic trait 2020-07-05 00:01:21 +02:00
Alex Lyon
4d28f48ad9 factor: combine Montgomery and Montgomery32 2020-07-05 00:01:21 +02:00
nicoo
a440807e6c factor::miller_rabin: Use a specialized basis for 32b integers 
~3% faster
 2020-07-05 00:01:21 +02:00
nicoo
e68bb192f2 factor::numeric: Add a 32b Montgomery variant [WiP] 
~32% faster
 2020-07-05 00:01:21 +02:00
nicoo
43ee92c40f factor::numeric: Generalise modular inverse computation 2020-07-05 00:01:21 +02:00
Alex Lyon
9de82d92b0
Merge pull request #1557 from nbraud/factor/issue_1556 
factor::miller_rabin: Fix bug #1556
 2020-06-24 04:53:32 -07:00
Alex Lyon
700d51a92b
Merge pull request #1528 from sylvestre/cp-no-deref 
feature(cp) implement -P/--no-deference
 2020-06-23 23:05:26 -07:00
nicoo
abf579975c factor::miller_rabin: Fix bug in primality test 
Introduced in 6b9585b1 (#1525: Performance improvements for `factor`).
Closes #1556
 2020-06-23 16:19:16 +02:00
nicoo
c5c86b00e9 factor::miller_rabin: Add tests reproducing #1556 2020-06-23 16:14:52 +02:00
nicoo
8e040bbf1a factor::table: Optimise the size of the precomputed table 
A too-large precomputed table actually slows down the program: we spend
time fetching it from disk and from memory (into the CPU's cache), and
larger prime factors are more unlikely to occur in random integers (prime p
occurs with probability ~1/p when sampling 64b numbers uniformly-at-random)

The new value was chosen after measuring the execution time (for all
integers between 2 and 10⁷) for a broad set of values:

| n    | time (s) |
|------|----------|
| 16   | 40.84    |
| 32   | 34.491   |
| 64   | 29.044   |
| 128  | 25.121   |
| 192  | 23.98    |
| 256  | 23.102   |
| 256  | 24.93    |
| 272  | 23.57    |
| 288  | 23.85    |
| 304  | 23.91    |
| 320  | 23.24    |
| 329  | 23.45    |
| 336  | 23.55    |
| 352  | 23.09    |
| 368  | 23.65    |
| 384  | 23.32    |
| 384  | 23.36    |
| 400  | 23.30    |
| 416  | 23.38    |
| 432  | 23.42    |
| 448  | 23.95    |
| 448  | 24.00    |
| 464  | 23.81    |
| 480  | 23.55    |
| 496  | 24.10    |
| 512  | 24.101   |
| 512  | 24.23    |
| 1027 | 29.864   |
 2020-06-20 22:22:55 +02:00
nicoo
9d992b77b2 factor: Keep the primes table size in a single place 2020-06-20 22:22:55 +02:00
nicoo
b956e632e1 factor::table: Coalesce accesses to the factors table 
~5.6% faster
 2020-06-20 22:22:55 +02:00
Sylvestre Ledru
2d62097843 feature(cp): Manage -P & -R 2020-06-20 10:49:15 +02:00
nicoo
0518e06053 factor::rho: Minor refactor for readability 2020-06-20 10:39:56 +02:00
nicoo
dacee413db factor::rho: Refactor to avoid unnecessary allocations 2020-06-20 10:39:56 +02:00
nicoo
71e1c52920 factor::Factors: Rename new() to one() 2020-06-20 10:39:56 +02:00
Sylvestre Ledru
280fafed8a feature(cp) implement -P/--no-deference 2020-06-20 09:38:39 +02:00
nicoo
45a1408fb0 fixup! factor: Add test exhibiting a bug in ρ 2020-06-19 15:28:01 +02:00
nicoo
9fe3de72f2 factor::rho: Fix very-unlikely bug (resulting in assertion failure) 
This bug can only be triggered when:
- the Miller-Rabin test produces a divisor `d` (rare) ;
- n / d is prime.
 2020-06-19 13:51:29 +02:00
nicoo
9eb944b6b9 factor: Add test exhibiting a bug in ρ 
The test is repeated 20 times to make it overwhelmingly-likely to fail
(the bug itself is only triggered rarely)
 2020-06-19 13:48:00 +02:00
nicoo
3a90e31307 factor::numeric::inv_mod_u64: Provide a more-helpful error message 2020-06-19 13:39:42 +02:00
nicoo
ef12991ee7 factors: Avoid repeatedly locking and flushing stdout 
By default, stdout's LineWriter results one syscall per line, i.e. a billion
syscalls when factoring a billion numbers...

Buffering the output yields a ~28% speedup.
 2020-06-18 16:45:40 -07:00
nicoo
2869248318 factor::Factors: Use a tree-based map internally 
This eliminate the need for sorting the prime factors for display.
25% performance improvement after the changes from factor/montgomery.
 2020-06-18 16:44:08 -07:00
nicoo
4b4d11b61a
factor: Add/update copyright notices as necessary (#1546) 2020-06-18 21:38:28 +02:00
Alex Lyon
6105cce69a
Merge pull request #1529 from nbraud/factor/montgomery 
factor: Faster modular arithmetic with the Montgomery transform
 2020-06-18 09:19:12 -07:00
nicoo
fb08d9ff9e factor::numeric::Montgomery::add: Deal with rare overflow case 2020-06-18 14:32:58 +02:00
Alex Lyon
e02b8a60f7
hashsum: switch from getopts to clap (#1542) 
* hashsum: switch from getopts to clap

Additionally, slightly refactor.  This commit will be the first of
a series of commits refactoring (at the very least) `hashsum`.
 2020-06-18 11:46:00 +02:00
Sylvestre Ledru
f17a112781
feature(ln): implement -r (#1540) 
* bump the minimal version of rustc to 1.32

* feature(ln): implement -r

* fix two issues

* Use cow

* rustfmt the change

* with cargo.lock 1.31

* try to unbreak windows
 2020-06-18 00:54:18 -07:00
nicoo
d1470dadf8 factor::numeric::gcd: Silence the (erroneous) dead code lint 2020-06-16 15:45:10 +02:00
nicoo
334e02786d factor: Run cargo fmt 2020-06-16 15:43:25 +02:00
Alex Lyon
8377abadb6
Fix to build on Rust 1.32.0 and formatting 2020-06-16 04:08:17 -05:00
Alex Lyon
110d6844ad
Use an iterator over OsString for uumain() 
Additionally, restructure `uname` so that we don't need to find the
iterator's length.
 2020-06-16 03:28:02 -05:00
nicoo
f1788d9e70 fixup! factor::numeric::Montgomery: Fix overflow bug 2020-06-16 01:17:16 +02:00
nicoo
4851619d62 factor::miller_rabin: Avoid repeatedly transforming 1 and -1 
Approx. 25% speedup
 2020-06-15 23:05:31 +02:00
nicoo
cb6051c580 factor::numeric::Montgomery: Fix overflow bug 2020-06-15 22:40:57 +02:00
nicoo
2238065c9d factor::numeric: Simplify Montgomery (remove superfluous Wrapping) 2020-06-15 19:18:34 +02:00
nicoo
19a0645a0a factor::numeric: Simplify inv_mod_u64 
Just call `u64::wrapping_{mul,sub}` instead of (de)constructing Wrapping<u64>
values.
 2020-06-15 19:18:34 +02:00
nicoo
918035e01e factor: Fix for old Rust 2020-06-15 19:18:34 +02:00
nicoo
f84d0f9398 factor::Factors::add: Make the precondition check a debug_assert 2020-06-15 19:18:34 +02:00
nicoo
33e18b4cd3 factor::numeric::Montgomery: Add debug assertions 
In debug mode, checks that all arithmetic operations coincide with the
plain-u64 versions, as long as the latter does not overflow.
 2020-06-15 19:18:34 +02:00
nicoo
8a4d0d30ad factor::numeric: Implement Montgomery's transform 
This is a facter way to perform arithmetic mod n, when n is odd and a 64b
number.
 2020-06-15 19:18:29 +02:00
nicoo
e91155519a factor::factor: Add integration tests 2020-06-15 19:10:16 +02:00
nicoo
bada7530fb factor::miller_rabin: Add tests 2020-06-15 19:10:16 +02:00
Roy Ivy III
813e57d225 fix cargo clippy complaint (redundant_clone) 2020-06-14 23:38:30 -05:00
Roy Ivy III
39e3c57198 fix cargo clippy complaint (clone_on_copy) 2020-06-14 23:38:30 -05:00
Sylvestre Ledru
7b452f3bfe style(nproc): reformat with rustfmt 2020-06-09 13:38:29 +02:00
Sylvestre Ledru
ac34d136f2 refactor(global): Move from tempdir to tempfile: 
* the crate has been deprecated
 2020-06-09 11:30:19 +02:00
Alex Lyon
80987250d2
Merge pull request #1521 from sylvestre/nproc 
Add tests for nproc + clap migration
 2020-06-08 19:18:00 -07:00
Alex Lyon
49771d4fda
Merge pull request #1535 from sylvestre/1.32 
Move to 1.32 as minimal supported version
 2020-06-08 14:31:02 -07:00
Sylvestre Ledru
5926315507 bump the minimal version of rustc to 1.32 2020-06-08 22:54:28 +02:00
Sylvestre Ledru
d0890b72cd
Merge pull request #1522 from sylvestre/groups 
groups: clap migration
 2020-06-08 22:19:08 +02:00
Sylvestre Ledru
851e25d134 refactor(logname): simplify the code 2020-06-07 17:54:30 +02:00
Sylvestre Ledru
5963b15746 refactor(nproc): fix some bugs and use clap 2020-06-02 23:29:21 +02:00
Sylvestre Ledru
ed1ebe09ff refactor(groups): move to clap 2020-06-02 23:16:18 +02:00
Sylvestre Ledru
78c04a254e refactor ~ rename MinSRV => MinRustV 2020-06-02 12:23:48 -05:00
Roy Ivy III
fbbd881ca9 docs ~ reduce sub-crate meta-information keywords to the maximum of five 2020-05-31 15:48:54 -05:00
Roy Ivy III
b2a566d50d fix/mknod ~ correct uucore feature dependency 2020-05-30 02:21:05 -05:00
Roy Ivy III
2fd7e15d63 fix/install ~ correct uucore feature dependency 2020-05-30 02:21:05 -05:00
Roy Ivy III
4b0dd73adb fix/chmod ~ correct uucore feature dependency 2020-05-30 02:21:05 -05:00