[libc] Add Uint128 type as a fallback when __uint128_t is not available.

Also, the unused specializations of __int128_t have been removed.

Differential Revision: https://reviews.llvm.org/D128304

[libc] Support 32-bit ARM platform tests

Set LONG_DOUBLE_IS_DOUBLE, add ifdefs for 128-bit integer types

Differential Revision: https://reviews.llvm.org/D124204

[libc][NFC] remove completed TODOs

There were some "TODO" messages that were for things that I have already
completed. This patch removes those.

Reviewed By: michaelrj

Differential Revision: https

[libc][NFC] remove completed TODOs

There were some "TODO" messages that were for things that I have already
completed. This patch removes those.

Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D121232

show more ...

[libc] Fix mixed-sign comparison warnings and an out-of-bound access in high_precision_decimal.h

Fix mixed-sign comparison warnings and an out-of-bound access in high_precision_decimal.h

Reviewed B

[libc] Fix mixed-sign comparison warnings and an out-of-bound access in high_precision_decimal.h

Fix mixed-sign comparison warnings and an out-of-bound access in high_precision_decimal.h

Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D119156

show more ...

[libc] add modified Eisel-Lemire for long doubles

The Eisel-Lemire algorithm is an effecient way to handle converting to
floating point numbers from strings, but in its base form it only
supports up

[libc] add modified Eisel-Lemire for long doubles

The Eisel-Lemire algorithm is an effecient way to handle converting to
floating point numbers from strings, but in its base form it only
supports up to 64 bit floating point numbers. This adds an
implementation to handle long doubles.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D115280

show more ...

[libc] apply formatting to tests

Apply the formatting rules that were applied to the libc/src directory
to the libc/test directory, as well as the files in libc/utils that are
included by the tests.

[libc] apply formatting to tests

Apply the formatting rules that were applied to the libc/src directory
to the libc/test directory, as well as the files in libc/utils that are
included by the tests. This does not include automated enforcement.

Reviewed By: sivachandra, lntue

Differential Revision: https://reviews.llvm.org/D116127

show more ...

[libc] apply new lint rules

This patch applies the lint rules described in the previous patch. There
was also a significant amount of effort put into manually fixing things,
since all of the templat

[libc] apply new lint rules

This patch applies the lint rules described in the previous patch. There
was also a significant amount of effort put into manually fixing things,
since all of the templated functions, or structs defined in /spec, were
not updated and had to be handled manually.

Reviewed By: sivachandra, lntue

Differential Revision: https://reviews.llvm.org/D114302

show more ...

[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

[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

show more ...

[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 d

[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

show more ...

[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-Lemir

[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

show more ...