cosmopolitan/libc
Justine Tunney 11ec60d5fc
Use a better sorting algorithm
This change changes qsort() to use the same code as NetBSD and MacOS
because it goes 6x faster than Musl's SmoothSort function. Smoothsort
can still be used if you need something that's provenly linearithmic.
This change also improves GNU Make performance on whole by 7 percent!

netbsd nearly   l:    70,196c    22,673ns   m:    68,428c    22,102ns
musl nearly     l:    53,844c    17,391ns   m:    58,726c    18,968ns
unixv6 nearly   l:    65,885c    21,280ns   m:    63,082c    20,375ns

netbsd reverse  l:   120,290c    38,853ns   m:   122,619c    39,605ns
musl reverse    l:   801,826c   258,985ns   m:   794,689c   256,680ns
unixv6 reverse  l:    58,977c    19,049ns   m:    59,764c    19,303ns

netbsd random   l:   146,745c    47,398ns   m:   145,782c    47,087ns
musl random     l:   855,804c   276,420ns   m:   850,912c   274,840ns
unixv6 random   l:   214,325c    69,226ns   m:   213,906c    69,090ns

netbsd 2n       l:    77,299c    24,967ns   m:    76,773c    24,797ns
musl 2n         l:   818,012c   264,213ns   m:   818,282c   264,301ns
unixv6 2n       l: 3,967,009c 1,281,322ns   m: 3,941,792c 1,273,177ns

https://justine.lol/dox/sort.pdf
2022-09-06 11:06:10 -07:00
..
calls Make more compatibility improvements 2022-09-06 07:04:13 -07:00
crt Work around Rosetta clobbering startup registers on M1 Macs (issue #429) (#453) 2022-06-27 16:28:59 -07:00
dns Fold LIBC_ALG into LIBC_MEM 2022-08-13 08:32:34 -07:00
elf Clean up some code 2022-08-20 12:32:51 -07:00
fmt Make more compatibility improvements 2022-09-06 07:04:13 -07:00
integral Make more compatibility improvements 2022-09-06 07:04:13 -07:00
intrin Improve quality of our ANSI C clock() function 2022-09-05 23:03:49 -07:00
isystem Make more compatibility improvements 2022-09-06 07:04:13 -07:00
linux Add atomics to chibicc 2022-06-20 03:08:00 -07:00
log Fix build 2022-09-03 21:10:37 -07:00
mem Use a better sorting algorithm 2022-09-06 11:06:10 -07:00
nexgen32e Add more missing C / C++ headers 2022-09-04 04:53:52 -07:00
nt Make more compatibility improvements 2022-09-06 07:04:13 -07:00
runtime Make more compatibility improvements 2022-09-06 07:04:13 -07:00
sock Make more compatibility improvements 2022-09-06 07:04:13 -07:00
stdio Improve zipos path handling (#579) 2022-09-03 22:50:23 -07:00
str Use a better sorting algorithm 2022-09-06 11:06:10 -07:00
stubs Make more compatibility improvements 2022-09-06 07:04:13 -07:00
sysv Make more compatibility improvements 2022-09-06 07:04:13 -07:00
testlib Remove testonly keyword 2022-09-05 08:41:43 -07:00
thread Make more compatibility improvements 2022-09-06 07:04:13 -07:00
time Improve quality of our ANSI C clock() function 2022-09-05 23:03:49 -07:00
tinymath Add automatic TMPDIR setup/teardown to GNU Make 2022-08-14 02:03:41 -07:00
x Do some string library work 2022-08-20 22:17:14 -07:00
zipos Improve zipos path handling (#579) 2022-09-03 22:50:23 -07:00
assert.h Make more libc improvements 2022-08-06 17:18:40 -07:00
atomic.h Fold LIBC_BITS into LIBC_INTRIN 2022-08-11 12:13:18 -07:00
complex.h Fix some more reported issues 2022-04-28 20:36:33 -07:00
dce.h Remove plenty of makefile misconfigurations 2022-07-21 09:20:59 -07:00
disclaimer.inc Improve Libc by making Python work even better 2021-08-18 22:16:23 -07:00
dos.h
errno.h Change type of errnos to errno_t 2022-08-05 02:13:10 -07:00
inttypes.h Import C++ Standard Template Library 2022-03-22 06:41:54 -07:00
iso646.internal.h Add more missing C / C++ headers 2022-09-04 04:53:52 -07:00
libc.mk Fold LIBC_UNICODE into LIBC_STR 2022-08-13 08:42:32 -07:00
limits.h Make more compatibility improvements 2022-09-06 07:04:13 -07:00
literal.h Import C++ Standard Template Library 2022-03-22 06:41:54 -07:00
mach.h
macho.internal.h
macros.internal.h Add more missing C / C++ headers 2022-09-04 04:53:52 -07:00
math.h Import C++ Standard Template Library 2022-03-22 06:41:54 -07:00
notice.inc Improve Libc by making Python work even better 2021-08-18 22:16:23 -07:00
notice.internal.h
paths.h
README.md Reformat libc README.md (#437) 2022-06-21 07:50:42 -07:00
stdalign.internal.h Add more missing C / C++ headers 2022-09-04 04:53:52 -07:00
type2str.h Improve synchronization 2022-04-15 15:31:55 -07:00
zip.h Fold LIBC_BITS into LIBC_INTRIN 2022-08-11 12:13:18 -07:00

Cosmopolitan Standard Library

This directory defines static archives defining functions, like printf(), mmap(), win32, etc. Please note that the Cosmopolitan build configuration doesn't link any C/C++ library dependencies by default, so you still have the flexibility to choose the one provided by your system. If you'd prefer Cosmopolitan, just add $(LIBC) and $(CRT) to your linker arguments.

Your library is compromised of many bite-sized static archives. We use the checkdeps tool to guarantee that the contents of the archives are organized in a logical way that's easy to use with or without our makefile infrastructure, since there's no cyclic dependencies.

The Cosmopolitan Library exports only the most stable canonical system calls for all supported operating systems, regardless of which platform is used for compilation. We polyfill many of the APIs, e.g. read(), write() so they work consistently everywhere while other apis, e.g. CreateWindowEx(), might only work on one platform, in which case they become no-op functions on others.

Cosmopolitan polyfill wrappers will usually use the dollar sign naming convention, so they may be bypassed when necessary. This same convention is used when multiple implementations of string library and other performance-critical function are provided to allow Cosmopolitan to go fast on both old and newer computers.

We take an approach to configuration that relies heavily on the compiler's dead code elimination pass (libc/dce.h). Most of the code is written so that, for example, folks not wanting support for OpenBSD can flip a bit in SUPPORT_VECTOR and that code will be omitted from the build. The same is true for builds that are tuned using -march=native which effectively asks the library to not include runtime support hooks for x86 processors older than what you use.

Please note that, unlike Cygwin or MinGW, Cosmopolitan does not achieve broad support by bolting on a POSIX emulation layer. We do nothing more than (in most cases) stateless API translations that get you 90% of the way there in a fast lightweight manner. We therefore can't address some of the subtle differences, such as the nuances of absolute paths on Windows. Our approach could be compared to something more along the lines of, "the Russians just used a pencil to write in space", versus spending millions researching a pen like NASA.