./math/djbsort, Library for sorting arrays of integers

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Branch: CURRENT, Version: 20190516nb1, Package name: djbsort-20190516nb1, Maintainer: schmonz

djbsort is a software library for sorting arrays of integers. It
provides the following features:

- Speed: djbsort holds new speed records for in-memory sorting.

- Security: djbsort is designed to be safe for cryptographic contexts.

- Verification: djbsort includes tools to automatically verify correctness.

These features are not separate options: there is a single sorting
function that is simultaneously fast, secure, and verified.


Required to run:
[lang/python27] [lang/python37]

Required to build:

Master sites:

Filesize: 30.202 KB

Version history: (Expand)

CVS history: (Expand)

   2022-06-30 13:19:02 by Nia Alarie | Files touched by this commit (524)
Log message:
*: Revbump packages that use Python at runtime without a PKGNAME prefix
   2021-10-26 12:56:13 by Nia Alarie | Files touched by this commit (458)
Log message:
math: Replace RMD160 checksums with BLAKE2s checksums

All checksums have been double-checked against existing RMD160 and
SHA512 hashes
   2021-10-07 16:28:36 by Nia Alarie | Files touched by this commit (458)
Log message:
math: Remove SHA1 hashes for distfiles
   2021-02-18 11:08:31 by Amitai Schleier | Files touched by this commit (3) | Package updated
Log message:
Update to 20190516. From the changelog:

- Speed tests now call cpucycles() before setting resource limits. This
  is important on platforms where cpucycles() needs to read files.

- Support for SignExt and several more peephole optimizations, working
  towards support for simpler symbolic-execution backend. Various
  updates to work with angr8 and python3.
   2020-12-04 21:45:51 by Nia Alarie | Files touched by this commit (456)
Log message:
Revbump packages with a runtime Python dep but no version prefix.

For the Python 3.8 default switch.
   2019-04-25 09:33:32 by Maya Rashish | Files touched by this commit (620)
Log message:
PKGREVISION bump for anything using python without a PYPKGPREFIX.

This is a semi-manual PKGREVISION bump.
   2018-08-09 11:14:17 by Amitai Schleier | Files touched by this commit (3)
Log message:
We don't install multiple architectures, so don't build them. Bump
PKGREVISION defensively, since it's hard to be sure the binary package
hasn't changed.
   2018-07-31 08:34:11 by Amitai Schleier | Files touched by this commit (3)
Log message:
Update to 20180729. From the changelog:


Rewrite of the core int32/avx2 implementation for (1) higher speed and
(2) reduced memory consumption. Stack allocation is now at most a few
kilobytes, even for gigantic arrays.

Internally, the sorting algorithm is now mostly bitonic to simplify
indexing, although odd-even speedups are still applied when
convenient. Lanes are complemented to take the down-up decision out of
the inner loops.

As in previous djbsort versions, data is sorted first in vector lanes
and then transposed for final merges, reducing the overall number of
vector permutations. Unlike previous versions, transposition is done
in-place. The transposition in this version is bit-reversal on the outer
6 bits (bottom 3 bits and the top 3 bits), but leaves intermediate bits
alone. Non-power-of-2 array sizes are handled by an extra, more
traditional, merge step.

Sizes 2, 3, 4, 5, 6, 7, 8, 16, 32 are now special-cased. Non-power-of-2
sizes below 256 are padded to the next power of 2.

Portable implementations: The out-of-place int32/portable1 and
int32/portable2 implementations are now gone; the in-place
int32/portable3 and int32/portable4 implementations remain.


float32_sort is now supported. The arithmetic in the reduction from
float32 to int32 is int32 31-bit right shift, uint32 1-bit right shift,
xor; this is slightly more efficient than the reduction from float32 to
uint32 from 2001 Herf.


Tests now have more variation (without much slowdown): the uint32 test
cases now deviate from int32 in more than the sign; float32 uses
floating-point numbers that aren't integers; int32 does more loops for
small cases, and some larger cases.


API for 2-input sorting is now MINMAX macro operating on two
inputs in place.

Better inline assembly from Jason Donenfeld for 2-input sorting: more
flexibility in compiler's register allocation.

The package version number is now automatically copied to version.c as
the implementation version number for implementations that don't provide


minmax now supports more peephole optimizations for complemented bitonic
sorting and for padding: xor(s,xor(s,t)) ⇒ t; xor(-1,s) ⇒ invert(s);
Reverse(Reverse(s)) ⇒ s; signedmin(invert(s),invert(t)) ⇒
invert(signedmax(s,t)); signedmax(invert(s),invert(t)) ⇒
invert(signedmin(s,t)); invert(s)[high:low] ⇒ invert(s[high:low]);
s[bits-1:0] ⇒ s; s[high:low][high2:low2] ⇒ s[high2+low:low2+low];
Concat(...)[high:low] ⇒ ...[high-pos:low-pos] when possible;
Reverse(s)[high:low] ⇒ Reverse(s[...]) when possible; eliminate
signedmin/signedmax when one input is the minimum or maximum constant.

verifymany now includes the implementation version number on
verified lines.