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1600 Commits

Author SHA1 Message Date
Vinayak Dev
5ea152033e
[libc]: Implement strfromf() and shared utilities (#85438) 
Fixes #84244.

Implements the function `strfromf()` introduced in C23, and adds shared
utilities for implementation of other `strfrom*()` functions, including
`strfromd()` and `strfroml()`.
 2024-03-20 10:47:35 -07:00
Guillaume Chatelet
2137894a6f
[libc][NFC] Move Sign type to separate header (#85930) 2024-03-20 15:10:19 +01:00
Joseph Huber
3dc1b5044e
[libc] Make 'printf' converter output "(null)" instead of "null" (#85845) 
Summary:
Currently we print `null` for the null pointer in a `%s` expression.
Although it's not defined by the standard, other implementations choose
to use `(null)` to indicate this. We also currently print `(nullptr)` so
I think it's more consistent to use parens in both cases.
 2024-03-19 14:44:59 -05:00
Nick Desaulniers
c63a291c64
[libc][cpp] reverse_iterator support (#85702) 
Towards the goal of implementing __cxa_finalize (#85651) I'd like to be able to
reverse iterate over cpp::arrays such as the one used in FixedVector.

Implement the enough iterator support to be able to iterate a cpp::array in
reverse, and add tests.

Of note, reverse iterator's begin() refers to forward iterator's end() (and
vice versa). When dereferenced (operator*), the reverse iterator returns a copy
that's been pre-decremented (the underlying forward iterator is advanced).
 2024-03-19 09:25:57 -07:00
lntue
a1fb51453d
[libc] Prevent constant propagation for atanf(+-Inf) in gcc. (#85733) 
gcc bot failures with `atanf(+-Inf)`:
https://lab.llvm.org/buildbot/#/builders/250/builds/20331/steps/8/logs/stdio
 2024-03-19 11:15:06 -04:00
lntue
bda05140fb
[libc] Remove constexpr from atan_eval and asin_eval. (#85725) 
Fix aarch64 and gcc full build bots:
https://lab.llvm.org/buildbot/#/builders/223/builds/38235/steps/4/logs/stdio
 2024-03-18 23:43:57 -04:00
lntue
a629621454
[libc][math] Improve atanf performance. (#85463) 
Simplify the range reduction logic and computations. Performance test
using `perf.sh` from CORE-MATH project on Ryzen 5900X:

Before:
```
$ ./perf.sh atanf --rdtsc --path1
LIBC-location: /home/lnt/experiment/llvm-project/build/projects/libc/lib/libllvmlibc.a
GNU libc version: 2.35
GNU libc release: stable
-- CORE-MATH reciprocal throughput --
[####################] 100 %
Ntrial = 20 ; Min = 14.369 + 0.556 clc/call; Median-Min = 0.613 clc/call; Max = 15.061 clc/call;
-- System LIBC reciprocal throughput --
[####################] 100 %
Ntrial = 20 ; Min = 26.180 + 0.015 clc/call; Median-Min = 0.014 clc/call; Max = 26.260 clc/call;
-- LIBC reciprocal throughput --
[####################] 100 %
Ntrial = 20 ; Min = 21.237 + 0.022 clc/call; Median-Min = 0.020 clc/call; Max = 21.272 clc/call;

$ ./perf.sh atanf --rdtsc --path1 --latency
LIBC-location: /home/lnt/experiment/llvm-project/build/projects/libc/lib/libllvmlibc.a
GNU libc version: 2.35
GNU libc release: stable
-- CORE-MATH latency --
[####################] 100 %
Ntrial = 20 ; Min = 50.505 + 0.045 clc/call; Median-Min = 0.037 clc/call; Max = 50.579 clc/call;
-- System LIBC latency --
[####################] 100 %
Ntrial = 20 ; Min = 62.438 + 0.836 clc/call; Median-Min = 0.049 clc/call; Max = 64.498 clc/call;
-- LIBC latency --
[####################] 100 %
Ntrial = 20 ; Min = 67.781 + 0.546 clc/call; Median-Min = 0.028 clc/call; Max = 68.844 clc/call;
```

After:
```
$ ./perf.sh atanf --rdtsc --path2
LIBC-location: /home/lnt/experiment/llvm/llvm-project/build/projects/libc/lib/libllvmlibc.a
GNU libc version: 2.35
GNU libc release: stable
-- CORE-MATH reciprocal throughput --
[####################] 100 %
Ntrial = 20 ; Min = 14.400 + 0.353 clc/call; Median-Min = 0.404 clc/call; Max = 14.863 clc/call;
-- System LIBC reciprocal throughput --
[####################] 100 %
Ntrial = 20 ; Min = 25.247 + 0.783 clc/call; Median-Min = 0.714 clc/call; Max = 26.238 clc/call;
-- LIBC reciprocal throughput --
[####################] 100 %
Ntrial = 20 ; Min = 13.751 + 0.158 clc/call; Median-Min = 0.140 clc/call; Max = 14.006 clc/call;

$ ./perf.sh atanf --rdtsc --path2 --latency
LIBC-location: /home/lnt/experiment/llvm/llvm-project/build/projects/libc/lib/libllvmlibc.a
GNU libc version: 2.35
GNU libc release: stable
-- CORE-MATH latency --
[####################] 100 %
Ntrial = 20 ; Min = 51.837 + 0.073 clc/call; Median-Min = 0.058 clc/call; Max = 52.000 clc/call;
-- System LIBC latency --
[####################] 100 %
Ntrial = 20 ; Min = 62.487 + 1.878 clc/call; Median-Min = 1.965 clc/call; Max = 64.569 clc/call;
OK
-- LIBC latency --
[####################] 100 %
Ntrial = 20 ; Min = 55.414 + 1.312 clc/call; Median-Min = 0.345 clc/call; Max = 58.362 clc/call;
```
 2024-03-18 21:10:50 -04:00
Michael Jones
5d56b34807
[libc] Remove direct math.h includes (#85324) 
Reland of #84991

A downstream overlay mode user ran into issues with the isnan macro not
working in our sources with a specific libc configuration. This patch
replaces the last direct includes of math.h with our internal
math_macros.h, along with the necessary build system changes.
 2024-03-18 14:19:33 -07:00
Shourya Goel
ca04b56a8b
[libc] Implement fileno (#85628) 
fixes: #85150
 2024-03-18 09:26:30 -07:00
Schrodinger ZHU Yifan
f6f42af06f
[libc] Add shm_open/shm_unlink (#84974) 2024-03-18 11:40:07 -04:00
Petr Hosek
5a4bbaf8c0 [libc] remove.cpp dependency on libc.include.stdio 
This addresses a build error introduced by
5a75242bc898886b9833e328ad5f656246424a81.
 2024-03-17 16:16:20 -07:00
Petr Hosek
5a75242bc8
[libc] Include empty remove in baremetal stdio.h (#85336) 
This is required to avoid compilation error in libc++.

See #85335 for more details.
 2024-03-16 23:17:19 -07:00
OverMighty
a2bad75879
[libc][math][c23] Add nextupl and nextdownl functions (#85484) 
Fixes #85283.

cc @lntue
 2024-03-16 17:21:07 -04:00
OverMighty
8ff96eb100
[libc][math][c23] Add nextup{,f,f128} and nextdown{,f,f128} functions (#85431) 
See https://github.com/llvm/llvm-project/issues/85283.

I had a test for `nextdownl` that was failing and I thought I should add
`nextupl` and `nextdownl` later and first make a PR for the other
functions.

cc @lntue
 2024-03-15 16:46:48 -04:00
Michael Flanders
b43965adac
[libc][math][c23] adds nanf128 (#85201) 
Continuing #84689, this one required more changes than the others, so I
am making it a separate PR.

Extends some stuff in `str_to_float.h`, `str_to_integer.h` to work on
types wider than `unsigned long long` and `uint64_t`.

cc @lntue for review.
 2024-03-15 13:31:50 -04:00
Nick Desaulniers
6503eff6d3
[libc] remove BlockStore from cpp namespace (#85312) 
The cpp namespace should only be used to mirror APIs from C++'s std::
namespace
(at least until we share more code with libc++, see

https://discourse.llvm.org/t/rfc-project-hand-in-hand-llvm-libc-libc-code-sharing/77701)
 2024-03-15 09:12:24 -07:00
Michael Jones
0646bbc42c
Revert "[libc] Remove direct math.h includes from src" (#85314) 
Reverts llvm/llvm-project#84991

Caused build failures
 2024-03-14 14:25:25 -07:00
Michael Jones
caba6d13c8
[libc] Remove direct math.h includes from src (#84991) 
A downstream overlay mode user ran into issues with the isnan macro not
working in our sources with a specific libc configuration. This patch
replaces the last direct includes of math.h with our internal
math_macros.h, along with the necessary build system changes.
 2024-03-14 14:15:43 -07:00
Michael Flanders
15a55486a5
[libc][math] Adds entrypoint and test for nextafterf128 (#84882) 2024-03-12 23:25:05 -04:00
Petr Hosek
c6a93fe80b
[libc] Use __builtin_ffsll for RPC lane mask (#85000) 
src/__support/GPU/utils.h doesn't compile on a 32-bit platforms because
__builtin_ffsl uses long which is a 32-bit number. Use __builtin_ffsll
which uses long long which is guaranteed to be at least 64-bits.
 2024-03-12 18:25:36 -07:00
Nick Desaulniers
0ebf511ad0
[libc] move non <bit> functions to math_extras (#84818) 
As per TODOs added in

48b0bc8370.
 2024-03-12 08:44:06 -07:00
Joseph Huber
261e5648e7
[libc] Add utility functions for warp-level scan and reduction (#84866) 
Summary:
The GPU uses a SIMT execution model. That means that each value actually
belongs to a group of 32 or 64 other lanes executing next to it. These
platforms offer some intrinsic fuctions to actually take elements from
neighboring lanes. With these we can do parallel scans or reductions.
These functions do not have an immediate user, but will be used in the
allocator interface that is in-progress and are generally good to have.
This patch is a precommit for these new utilitly functions.
 2024-03-12 10:40:49 -05:00
Joseph Huber
c167a25887
[libc] Fix lane-id utility function not using built-in (#84902) 
Summary:
Previously we got the lane-id from taking the global thread ID and
taking off the bottom 5 bits. This works but is inefficient compared to
the NVPTX intrinsic simply dedicated to get this value.
 2024-03-12 10:40:35 -05:00
lntue
4d21e75210
[libc][math][c23] Add fmodl and fmodf128 math functions. (#84600) 
- Allow `FMod` template to have different computational types and make
it work for 80-bit long double.
- Switch to use `uint64_t` as the intermediate computational types for
`float`, significantly reduce the latency of `fmodf` when the exponent
difference is large.
 2024-03-11 16:27:42 -04:00
lntue
d99bb01422
[libc][NFC] Clean up test/src/math/differential_testing folder, renaming it to performance_testing. (#84646) 
Removing all the diff tests.
 2024-03-11 11:38:39 -04:00
Joseph Huber
9d30f11b88 [libc] Remove use of __builtin_modf in GPU math 
Summary:
This function was not actually supported, see
https://godbolt.org/z/MP1j5EeWc. Unsure why we only now begun seeing
failures related to it.
 2024-03-11 08:20:06 -05:00
Schrodinger ZHU Yifan
fe1645e25c
[libc][mman] Implement msync (#84700) 
Implement `msync` as specified in:

1. https://www.man7.org/linux/man-pages/man2/msync.2.html
2. https://pubs.opengroup.org/onlinepubs/9699919799/
 2024-03-10 19:01:54 -04:00
Joseph Huber
ea697dcc2a
[libc][NFC] Move GPU allocator implementation to common header (#84690) 
Summary:
This is a NFC move preceding more radical functional changes to the
allocator implementation. We just move it to a common utility so it will
be easier to write these in tandem.
 2024-03-10 15:49:44 -05:00
Michael Flanders
a066f71e70
[libc][stdbit] Fix truncation err in CPP bit_ceil (#84683) 
After #84657 was merged,
[buildbot](https://lab.llvm.org/buildbot/#/builders/250/builds/19808) is
reporting two errors for libc-x86_64-debian-gcc-fullbuild-dbg. This PR
addresses the truncation error for `CPP::bit_ceil<unsigned char>` and
`CPP::bit_ceil<unsigned short>`.

The errors are:

```
FAILED: projects/libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_bit_ceil_uc.dir/stdc_bit_ceil_uc.cpp.o
/usr/bin/g++ -DLIBC_NAMESPACE=__llvm_libc_19_0_0_git -D_DEBUG -I/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-gcc-fullbuild-dbg/build/projects/libc/src/stdbit -I/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-gcc-fullbuild-dbg/llvm-project/libc/src/stdbit -I/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-gcc-fullbuild-dbg/llvm-project/libc -isystem /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-gcc-fullbuild-dbg/build/projects/libc/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -fno-lifetime-dse -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-maybe-uninitialized -Wno-nonnull -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wdelete-non-vir!
 tual-dtor
  -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -g -fpie -ffreestanding -fno-builtin -fno-exceptions -fno-lax-vector-conversions -fno-unwind-tables -fno-asynchronous-unwind-tables -fno-rtti -ftrivial-auto-var-init=pattern -Wall -Wextra -Werror -Wconversion -Wno-sign-conversion -Wimplicit-fallthrough -Wwrite-strings -Wextra-semi -DLIBC_COPT_PUBLIC_PACKAGING -std=c++17 -MD -MT projects/libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_bit_ceil_uc.dir/stdc_bit_ceil_uc.cpp.o -MF projects/libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_bit_ceil_uc.dir/stdc_bit_ceil_uc.cpp.o.d -o projects/libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_bit_ceil_uc.dir/stdc_bit_ceil_uc.cpp.o -c /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-gcc-fullbuild-dbg/llvm-project/libc/src/stdbit/stdc_bit_ceil_uc.cpp
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-gcc-fullbuild-dbg/llvm-project/libc/src/stdbit/stdc_bit_ceil_uc.cpp:11:
/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-gcc-fullbuild-dbg/llvm-project/libc/src/__support/CPP/bit.h: In instantiation of ‘constexpr __llvm_libc_19_0_0_git::cpp::enable_if_t<is_unsigned_v<T>, T> __llvm_libc_19_0_0_git::cpp::bit_ceil(T) [with T = unsigned char; enable_if_t<is_unsigned_v<T>, T> = unsigned char]’:
/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-gcc-fullbuild-dbg/llvm-project/libc/src/stdbit/stdc_bit_ceil_uc.cpp:17:23:   required from here
/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-gcc-fullbuild-dbg/llvm-project/libc/src/__support/CPP/bit.h:196:57: error: conversion from ‘unsigned int’ to ‘unsigned char’ may change value [-Werror=conversion]
  196 |   return static_cast<T>(T(1) << cpp::bit_width<T>(value - 1u));
      |                                                   ~~~~~~^~~~
cc1plus: all warnings being treated as errors
[138/466] Building CXX object projects/libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_bit_ceil_us.dir/stdc_bit_ceil_us.cpp.o
FAILED: projects/libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_bit_ceil_us.dir/stdc_bit_ceil_us.cpp.o
/usr/bin/g++ -DLIBC_NAMESPACE=__llvm_libc_19_0_0_git -D_DEBUG -I/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-gcc-fullbuild-dbg/build/projects/libc/src/stdbit -I/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-gcc-fullbuild-dbg/llvm-project/libc/src/stdbit -I/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-gcc-fullbuild-dbg/llvm-project/libc -isystem /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-gcc-fullbuild-dbg/build/projects/libc/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -fno-lifetime-dse -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-maybe-uninitialized -Wno-nonnull -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wdelete-non-vir!
 tual-dtor
  -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -g -fpie -ffreestanding -fno-builtin -fno-exceptions -fno-lax-vector-conversions -fno-unwind-tables -fno-asynchronous-unwind-tables -fno-rtti -ftrivial-auto-var-init=pattern -Wall -Wextra -Werror -Wconversion -Wno-sign-conversion -Wimplicit-fallthrough -Wwrite-strings -Wextra-semi -DLIBC_COPT_PUBLIC_PACKAGING -std=c++17 -MD -MT projects/libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_bit_ceil_us.dir/stdc_bit_ceil_us.cpp.o -MF projects/libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_bit_ceil_us.dir/stdc_bit_ceil_us.cpp.o.d -o projects/libc/src/stdbit/CMakeFiles/libc.src.stdbit.stdc_bit_ceil_us.dir/stdc_bit_ceil_us.cpp.o -c /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-gcc-fullbuild-dbg/llvm-project/libc/src/stdbit/stdc_bit_ceil_us.cpp
In file included from /home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-gcc-fullbuild-dbg/llvm-project/libc/src/stdbit/stdc_bit_ceil_us.cpp:11:
/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-gcc-fullbuild-dbg/llvm-project/libc/src/__support/CPP/bit.h: In instantiation of ‘constexpr __llvm_libc_19_0_0_git::cpp::enable_if_t<is_unsigned_v<T>, T> __llvm_libc_19_0_0_git::cpp::bit_ceil(T) [with T = short unsigned int; enable_if_t<is_unsigned_v<T>, T> = short unsigned int]’:
/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-gcc-fullbuild-dbg/llvm-project/libc/src/stdbit/stdc_bit_ceil_us.cpp:17:23:   required from here
/home/llvm-libc-buildbot/buildbot-worker/libc-x86_64-debian-fullbuild/libc-x86_64-debian-gcc-fullbuild-dbg/llvm-project/libc/src/__support/CPP/bit.h:196:57: error: conversion from ‘unsigned int’ to ‘short unsigned int’ may change value [-Werror=conversion]
  196 |   return static_cast<T>(T(1) << cpp::bit_width<T>(value - 1u));
      |                                                   ~~~~~~^~~~
cc1plus: all warnings being treated as errors
```
 2024-03-10 14:44:06 -04:00
Michael Flanders
75b0d384fb
[libc][stdbit][c23] adds implementation of stdc_bit_ceil functions (#84657) 
Closes #84652.

Based on #84233.
 2024-03-10 12:53:28 -04:00
lntue
99f5e9634b
[libc][math][c23] Add modff128 C23 math function. (#84532) 2024-03-09 11:47:22 -05:00
Guillaume Chatelet
a84e66a92d
[libc] Provide LIBC_TYPES_HAS_INT64 (#83441) 
Umbrella bug #83182
 2024-03-09 09:43:07 +01:00
Joseph Huber
29762e3722
[libc][NFCI] Remove lane size template argument on RPC server (#84557) 
Summary:
We previously changed the data layout for the RPC buffer to make it lane
size agnostic. I put off changing the size for the server case to make
the patch smaller. This patch simply reorganizes code by making the lane
size an argument to the port rather than a templtae size. Heavily
simplifies a lot of code, no more `std::variant`.
 2024-03-08 15:02:19 -06:00
lntue
60d7bf3dbe
[libc][math][c23] Add (l|ll)rintf128 and (l|ll)roundf128 math functions. (#84504) 2024-03-08 12:15:02 -05:00
Guillaume Chatelet
23c397c7c9
[libc] Provide LIBC_TYPES_HAS_INT128 (#84149) 
Umbrella bug #83182
 2024-03-08 16:06:56 +01:00
Guillaume Chatelet
aa6e7a61c5
[libc][NFC] Remove integer_utils.h (#84466) 
Its sole user is `BigInt` so moving `full_mul` inside UInt.h.
 2024-03-08 14:16:42 +01:00
Guillaume Chatelet
9baa4140f2
[libc][NFC] Simplify BigInt::mul (#84468) 2024-03-08 14:16:07 +01:00
Guillaume Chatelet
6a8e6c9a31
[libc][NFC] Move BigInt out of the cpp namespace (#84445) 
As noted in
https://github.com/llvm/llvm-project/pull/84035#discussion_r1516817755
only files under the CPP folder should be in the `cpp` namespace.
 2024-03-08 09:41:23 +01:00
Nick Desaulniers
293ec4865b
[libc] rename cpp::count_ones to cpp::popcount to better mirror std:: (#84388) 
libc/src/__support/CPP/bit.h and cpp:: is meant to mirror std::. Fix the
TODO.
 2024-03-07 15:38:16 -08:00
lntue
14171b87a3
[libc][stdfix] Add exp function for short _Accum and _Accum types. (#84391) 2024-03-07 17:58:28 -05:00
Schrodinger ZHU Yifan
57a337378f
[libc][c23] add memset_explicit (#83577) 2024-03-07 14:57:35 -05:00
Guillaume Chatelet
c103d573e7
[libc] Fix forward missing BigInt specialization of mask_leading_ones / mask_trailing_ones (#84325) 
#84299 broke the arm32 build, this patch fixes it forward.
 2024-03-07 20:00:05 +01:00
Nick Desaulniers
101a13df71
[libc][stdbit] implement stdc_bit_floor (C23) (#84233) 2024-03-07 08:38:04 -08:00
Guillaume Chatelet
245d669f1d
[reland][libc] Remove UB specializations of type traits for BigInt (#84299) 
Note: This is a reland of #84035.

The standard specifies that it it UB to specialize the following traits:
 - `std::is_integral`
 - `std::is_unsigned`
 - `std::make_unsigned`
 - `std::make_signed`

This patch:
 - Removes specializations for `BigInt`
 - Transforms SFINAE for `bit.h` functions from template parameter to
   return type (This makes specialization easier).
 - Adds `BigInt` specialization for `bit.h` functions.
 - Fixes code depending on previous specializations.
 2024-03-07 11:41:35 +01:00
Guillaume Chatelet
27844cb2fa
Revert "[libc] Remove UB specializations of type traits for BigInt" (#84297) 
Reverts llvm/llvm-project#84035

Several bots are failing:
 - https://lab.llvm.org/buildbot/#/builders/223/builds/37522
 - https://lab.llvm.org/buildbot/#/builders/162/builds/51978
 - https://lab.llvm.org/buildbot/#/builders/163/builds/52560
 - https://lab.llvm.org/buildbot/#/builders/250/builds/19619
 2024-03-07 11:06:50 +01:00
Guillaume Chatelet
84f483dbee
[libc] Remove UB specializations of type traits for BigInt (#84035) 
The standard specifies that it it UB to specialize the following traits:
 - `std::is_integral`
 - `std::is_unsigned`
 - `std::make_unsigned`
 - `std::make_signed`

This patch:
 - Removes specializations for `BigInt`
 - Transforms SFINAE for `bit.h` functions from template parameter to
   return type (This makes specialization easier).
 - Adds `BigInt` specialization for `bit.h` functions.
 - Fixes code depending on previous specializations.
 2024-03-07 11:01:09 +01:00
lntue
ad33fe1281
[libc][stdfix] Add integer square root with fixed point output functions. (#83959) 
Fix https://github.com/llvm/llvm-project/issues/83924.
 2024-03-06 18:35:44 -05:00
Michael Jones
d34b3c9c5a
[libc] Add max length argument to decimal to float (#84091) 
The implementation for from_chars in libcxx is possibly going to use our
decimal to float utilities, but to do that we need to support limiting
the length of the string to be parsed. This patch adds support for that
length limiting to decimal_exp_to_float, as well as the functions it
calls (high precision decimal, str to integer).
 2024-03-06 14:30:05 -08:00
Nick Desaulniers
041638c429
[libc][stdbit] implement stdc_bit_width (C23) (#83892) 2024-03-05 09:49:41 -08:00
Nick Desaulniers
2aa22ca2ca
[libc] suppress readability-identifier-naming for std::numeric_limits interfaces (#83921) 
These templates are made to match the ergonomics of std::numeric_limits.
Because our style for constexpr variables is ALL_CAPS, we must silence the
linter for these manually.

Link:
https://clang.llvm.org/extra/clang-tidy/#suppressing-undesired-diagnostics
 2024-03-05 08:17:27 -08:00