delta/llvm.git/libc/test/src, branch EmptyLineAfterFunctionDefinition

[libc] fix strtof/d/ld NaN parsing

2021-11-17T19:00:54+00:00

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

[libc] Use more consistent if defined syntax

2021-11-17T15:16:28+00:00

[libc] Correct rounding for hexadecimalStringToFloat with long inputs.

2021-11-16T19:29:39+00:00

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

[libc] tweak strtof errno behavior

2021-11-11T18:17:38+00:00

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

[libc] refactor atof string parsing

2021-11-09T18:12:18+00:00

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:
https://github.com/nigeltao/parse-number-fxx-test-data/tree/fe94de252c691900982050c8e7c503d1efd1299a

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

[libc] add stpcpy and stpncpy

2021-11-04T18:39:26+00:00

Adds an implementation for stpcpy and stpncpy, which are posix extension
functions.

Reviewed By: sivachandra, lntue

Differential Revision: https://reviews.llvm.org/D111913

[libc][NFC] rename str_conv_utils to str_to_integer

2021-11-03T22:56:28+00:00

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

[libc] Add more robust compile time architecture detection

2021-11-02T11:00:33+00:00

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

[libc] add strndup

2021-11-01T19:52:51+00:00

add an implementation of strndup

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D112846

Revert "[libc] Add more robust compile time architecture detection"

2021-10-29T20:25:55+00:00

This reverts commit a72e2499865b55cb007b63673100c06cc85faf97.