Commit Graph

570 Commits

Author SHA1 Message Date
Michael Jones 47d0c83e1f [libc] fix strtof/d/ld NaN parsing
Fix the fact that previously strtof/d/ld would only accept a NaN as
having parentheses if the thing in the parentheses was a valid number,
now it will accept any combination of letters and numbers, but will only
put valid numbers in the mantissa.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D113790
2021-11-17 11:00:54 -08:00
Guillaume Chatelet 649d953716 [libc] Use more consistent if defined syntax 2021-11-17 15:16:28 +00:00
Guillaume Chatelet 5ee5acf7d9 [libc] Fix missing restricts 2021-11-17 15:16:25 +00:00
Guillaume Chatelet 392da6428d [libc] Fix documentation typo 2021-11-17 15:16:05 +00:00
Guillaume Chatelet 13744e3d73 [libc][benchmark] add memmove to size distribution, also update other distributions
Differential Revision: https://reviews.llvm.org/D113260
2021-11-17 09:22:05 +00:00
Mircea Trofin 67de95b8c9 Revert "[libc][NFC][Obvious] Fix the benchmarks after the switch to llvm/third-party"
This reverts commit 39e9f5d368.

Reverting, as we needed to re-revert the benchmarks move because it was
causing a build failure in the Fuchsia bots due to the way they consume
libcxx's CMakeLists. I want to make sure I understand where the fix
should be for that. After that, I'll incorporate the change here in the
re-reland.
2021-11-16 16:59:14 -08:00
Mircea Trofin b2fbd45d23 Revert "Reland "[benchmarks] Move libcxx's fork of google/benchmark and llvm/utils'"""
This reverts commit 1ee32055ea.

We hit additional bot failures; in particular, Fuchsia's seems to be
related to how CMakeLists are ingested, see https://ci.chromium.org/ui/p/fuchsia/builders/toolchain.ci/clang-linux-x64/b8830380874445931681/overview
2021-11-16 16:35:06 -08:00
Siva Chandra Reddy 39e9f5d368 [libc][NFC][Obvious] Fix the benchmarks after the switch to llvm/third-party 2021-11-16 22:24:49 +00:00
Tue Ly 201cc2d885 [libc] Correct rounding for hexadecimalStringToFloat with long inputs.
Update binaryExpTofloat so that it will round correctly for long inputs when converting hexadecimal strings to floating points.

Differential Revision: https://reviews.llvm.org/D113815
2021-11-16 14:29:39 -05:00
Mircea Trofin 1ee32055ea Reland "[benchmarks] Move libcxx's fork of google/benchmark and llvm/utils'""
This reverts commit e7568b68da and relands
c6f7b720ec.

The culprit was: missed that libc also had a dependency on one of the
copies of `google-benchmark`

Also opportunistically fixed indentation from prev. change.

Differential Revision: https://reviews.llvm.org/D112012
2021-11-16 10:33:31 -08:00
Shao-Ce SUN 0c660256eb [NFC] Trim trailing whitespace in *.rst 2021-11-15 09:17:08 +08:00
Tue Ly 499ca806dc [libc] Simplify decimalStringToFloat and hexadecimalStringToFloat and improve their performance.
Combine two loops in decimalStringToFloat and hexadecimalStringToFloat that extract the digits and re-arrange them a little bit.  This slightly improves the performance of strtof and strtod:
Running libc_str_to_float_comparison_test parse-number-fxx-test_data/data/* on my machine (Ryzen 1700)
- with glibc: ~1.92 seconds
- with current implementation: ~1.78 seconds
- with this change: ~1.67 seconds

Differential Revision: https://reviews.llvm.org/D113681
2021-11-11 18:33:24 -05:00
Michael Jones 4cdf9884b6 [libc] tweak strtof errno behavior
When strtof/d/ld return a subnormal number they may set errno to
ERANGE. This change makes this behavior more consistent by making any
decimal number converting to a subnormal set errno to ERANGE. This
brings it in line with hexadecimals, which currently only set errno to
ERANGE if the number is truncated when converting to a subnormal.

Reviewed By: sivachandra, lntue

Differential Revision: https://reviews.llvm.org/D113626
2021-11-11 10:17:38 -08:00
Michael Jones 18da0c0a28 [libc] clean up FPUtil long doubles
Add quietNaNMask consts to FloatProperties and make LongDoubleBitsX86
clear the extra bits that aren't set when initializing with an 80 bit
long double.

Reviewed By: sivachandra, lntue

Differential Revision: https://reviews.llvm.org/D113625
2021-11-11 10:17:36 -08:00
Michael Jones 8298424cae [libc] refactor atof string parsing
Split the code for parsing hexadecimal floating point numbers from the
code for parsing the decimal floating point numbers so that the parsing
can be faster for both of them.

This decreases the time for the benchmark in release mode by about 15%,
which noticeably beats GLibc.

Old version: 2.299s
New version: 1.893s
GLibc: 2.133s

Tests run by running the following command 10 times for each version:
time ~/llvm-project/build/bin/libc_str_to_float_comparison_test ~/parse-number-fxx-test-data/data/*

the parse-number-fxx-test-data-repository is here:
fe94de252c

It's important to build llvm-libc in Release mode for accurate
performance comparisons against glibc (set -DCMAKE_BUILD_TYPE=Release in
your cmake).
You also have to build the libc_str_to_float_comparison_test target.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D113036
2021-11-09 10:12:18 -08:00
Michael Jones 9b6f8b985c [libc] add stpcpy and stpncpy
Adds an implementation for stpcpy and stpncpy, which are posix extension
functions.

Reviewed By: sivachandra, lntue

Differential Revision: https://reviews.llvm.org/D111913
2021-11-04 11:39:26 -07:00
Guillaume Chatelet c02aa15438 [libc][NFC] Allow memset (and bzero) to be inlined
This allows shipping individual functions without also having to provide
memset or bzero at the expense of bigger functions.

Similar to D113097.

Differential Revision: https://reviews.llvm.org/D113108
2021-11-04 13:48:18 +00:00
Guillaume Chatelet 4f3511e28f [libc][NFC] Allow memcmp to be inlined
Similar to D113097 although not strictly necessary for now. It helps
keeping the same structure for all memory functions.

Differential Revision: https://reviews.llvm.org/D113103
2021-11-04 13:47:50 +00:00
Guillaume Chatelet c2ce8f02ed [libc][NFC] Allow memcpy to be inlined
This allows shipping individual functions without also having to provide
`memcpy` at the expense of bigger functions.
Next is to use this `inlined_memcpy` in:
 - loader/linux/x86_64/start.cpp
 - src/string/memmove.cpp
 - src/string/mempcpy.cpp
 - src/string/strcpy.cpp
 - src/string/strdup.cpp
 - src/string/strndup.cpp

Differential Revision: https://reviews.llvm.org/D113097
2021-11-04 13:47:19 +00:00
Michael Jones 31d797f41e [libc][NFC] rename str_conv_utils to str_to_integer
rename str_conv_utils to str_to_integer to be more
in line with str_to_float.

Reviewed By: sivachandra, lntue

Differential Revision: https://reviews.llvm.org/D113061
2021-11-03 15:56:28 -07:00
Guillaume Chatelet 0aea170b97 [libc] Add more robust compile time architecture detection
We may want to restrict the detected platforms to only `x86_64` and `aarch64`.
There are still custom detection in api.td but I don't think we can handle these:
 - config/linux/api.td:205
 - config/linux/api.td:199

Differential Revision: https://reviews.llvm.org/D112818
2021-11-02 11:00:33 +00:00
Michael Jones 3bbbec1ae7 [libc] add strndup
add an implementation of strndup

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D112846
2021-11-01 12:52:51 -07:00
Guillaume Chatelet fe953b15cf Revert "[libc] Add more robust compile time architecture detection"
This reverts commit a72e249986.
2021-10-29 20:25:55 +00:00
Guillaume Chatelet a72e249986 [libc] Add more robust compile time architecture detection
We may want to restrict the detected platforms to only `x86_64` and `aarch64`.
There are still custom detection in api.td but I don't think we can handle these:
 - config/linux/api.td:205
 - config/linux/api.td:199

Differential Revision: https://reviews.llvm.org/D112818
2021-10-29 20:15:12 +00:00
Guillaume Chatelet d7cc760f3b [libc][NFC] Fix typo and unused variable
Differential Revision: https://reviews.llvm.org/D112823
2021-10-29 19:42:51 +00:00
Michael Jones 62c187cb55 [libc] add fast path to string to float conversion
Add the fast path first described by Clinger [1] with additions by Gay [2].
This speeds up conversion by about 10% by handling numbers with fewer digits
more efficiently.

[1] Clinger WD. How to Read Floating Point Numbers Accurately.
SIGPLAN Not 1990 Jun;25(6):92–101. https://doi.org/10.1145/93548.93557.
[2] Gay DM, Correctly rounded binary-decimal and decimal-binary conversions;
1990. AT&T Bell Laboratories Numerical Analysis Manuscript 90-10.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D112580
2021-10-29 10:50:03 -07:00
Siva Chandra Reddy 6c3f53c7ba [libc][NFC] Move test related pieces from FPUtil to util/UnitTest.
Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D112673
2021-10-29 15:37:30 +00:00
Siva Chandra Reddy f362aea42d [libc][NFC] Move utils/CPP to src/__support/CPP.
The idea is to move all pieces related to the actual libc sources to the
"src" directory. This allows downstream users to ship and build just the
"src" directory.

Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D112653
2021-10-28 15:50:00 +00:00
Guillaume Chatelet 00c943a548 [libc] automemcpy 2021-10-28 11:10:15 +00:00
Michael Jones 9830518082 [libc][obvious] fix strdup being listed twice
strdup was being included even if malloc wasn't and that was causing
a build failure.

Differential Revision: https://reviews.llvm.org/D112641
2021-10-27 11:13:08 -07:00
Michael Jones 65bb6593e5 [libc] add strdup implementation
Add an implementation for strdup.

Reviewed By: lntue, sivachandra

Differential Revision: https://reviews.llvm.org/D111584
2021-10-27 10:21:04 -07:00
Michael Jones 7dcdbabb3b [libc] add malloc funcs as external entrypoints
malloc, calloc, realloc, and free are all functions that other libc
functions depend on, but are pulled from external sources, instead of
having an internal implementation. This patch adds a way to include
functions like that as entrypoints in the list of external entrypoints,
and includes the malloc functions using this new path.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D112104
2021-10-27 10:21:01 -07:00
Michael Jones 53804d4eb2 [libc] fix strtol returning the wrong length
Previously, strtol/ll/ul/ull would return a pointer to the end of its
parsing, regardless of if it detected a number. Now it will return a
length of 0 when it doesn't find a number.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D112176
2021-10-25 15:00:45 -07:00
Joe Loser 59cf6a7403
[libc][NFC] Remove extra space in libc/CMakeLists.txt 2021-10-25 16:29:14 -04:00
Joe Loser 46c82753f6
[libc][NFC] Remove extra slash in path in libc/CMakeLists.txt
Remove extra `/` in path to match the include filepath from the previous
line.

Differential Revision: https://reviews.llvm.org/D112476
2021-10-25 16:26:49 -04:00
Kazu Hirata d8e4170b0a Ensure newlines at the end of files (NFC) 2021-10-23 08:45:29 -07:00
Michael Jones 87c016078a [libc] add atof, strtof and strtod
Add the string to floating point conversion functions.
Long doubles aren't supported yet, but floats and doubles are. The
primary algorithm used is the Eisel-Lemire ParseNumberF64 algorithm,
with the Simple Decimal Conversion algorithm as backup.

Links for more information on the algorithms:

Number Parsing at a Gigabyte per Second, Software: Practice and
Experience 51 (8), 2021 (https://arxiv.org/abs/2101.11408)
https://nigeltao.github.io/blog/2020/eisel-lemire.html
https://nigeltao.github.io/blog/2020/parse-number-f64-simple.html

Differential Revision: https://reviews.llvm.org/D109261
2021-10-18 16:10:03 -07:00
Guillaume Chatelet 4a9bcb605b [libc] Memory function benchmarks: rename MemcmpConfiguration in MemcmpOrBcmpConfiguration
This will help make sense of the double use of the same type in https://reviews.llvm.org/D111622#inline-1065560.

Differential Revision: https://reviews.llvm.org/D111868
2021-10-15 13:42:29 +00:00
Michael Jones db8a88fef8 [libc] add memccpy and mempcpy
Add an implementation for memccpy and mempcpy. These functions are
posix extensions for the moment.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D111762
2021-10-14 16:38:00 -07:00
Michael Jones 9e9803bf82 [libc] Add strncat and fix strcat
This adds strncat to llvm libc. In addition, an error was found with
strcat and that was fixed.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D111583
2021-10-12 18:18:18 +00:00
Guillaume Chatelet ad82fe7b28 [libc] Add rep;movsb as an accelerator under x86 2021-10-08 14:31:55 +00:00
Guillaume Chatelet f256c39541 [libc] ifdef guard element architecture implementations 2021-10-08 14:25:26 +00:00
Guillaume Chatelet d01ae990e1 Revert "[libc] Add rep;movsb as an accelerator under x86"
This reverts commit 1c7160300d.
2021-10-08 13:44:37 +00:00
Guillaume Chatelet 1c7160300d [libc] Add rep;movsb as an accelerator under x86 2021-10-08 13:34:59 +00:00
Michael Jones 6f80339b18 [libc][NFC] Add supporting class for atof implementation
This change adds the High Precision Decimal described here:
https://nigeltao.github.io/blog/2020/parse-number-f64-simple.html
It will be used for the atof implementation later, but is complete and
tested now.

The code is inspired by the golang implmentation of the HPD class, which
can be found here: https://github.com/golang/go/blob/release-branch.go1.16/src/strconv/decimal.go

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D110454
2021-10-04 21:08:02 +00:00
Guillaume Chatelet adc18ad6ac [libc] move benchmark function registration to a different file 2021-09-30 13:11:33 +00:00
Michael Jones b62d72f3c5 [libc] Add support for 128 bit ints in limits.h
Also, this adds unit tests to check that limits.h complies with the C
standard.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D110643
2021-09-28 23:50:16 +00:00
Siva Chandra Reddy 8379fc4a53 [libc] Add implementations of the C standard condition variable functions.
Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D108948
2021-09-28 21:18:45 +00:00
Siva Chandra Reddy 5c3c716bb1 [libc] Add FE_DFL_ENV and handle it in fesetenv.
Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D110611
2021-09-28 18:09:52 +00:00
Michael Jones 43c543aab7 [libc][NFC] Make strchr and strrchr more consistent
Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D110581
2021-09-28 17:42:03 +00:00