[libc] Improve the performance of expf.

Reduce the polynomial's degree from 7 down to 4.

Currently we use a degree-7 minimax polynomial on an interval of length 2^-7
around 0 to compute `expf`. Bas

[libc] Improve the performance of expf.

Reduce the polynomial's degree from 7 down to 4.

Currently we use a degree-7 minimax polynomial on an interval of length 2^-7
around 0 to compute `expf`. Based on the suggestion of @santoshn and the RLIBM
project (https://github.com/rutgers-apl/rlibm-all/blob/main/source/float/exp.c)
and the improvement we made with `exp2f` in https://reviews.llvm.org/D122346,
it is possible to have a good polynomial of degree-4 on a subinterval of length
2^(-7) to approximate e^x.

We did try to either reduce the degree of the polynomial down to 3 or increase
the interval size to 2^(-6), but in both cases the number of exceptional values
exploded. So we settle with using a degree-4 polynomial of the interval of
size 2^(-7) around 0.

Reviewed By: sivachandra, zimmermann6, santoshn

Differential Revision: https://reviews.llvm.org/D122418

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[libc] Implement expf function that is correctly rounded for all rounding modes.

Implement expf function that is correctly rounded for all rounding modes.

Reviewed By: sivachandra, zimmermann6

Dif

[libc] Implement expf function that is correctly rounded for all rounding modes.

Implement expf function that is correctly rounded for all rounding modes.

Reviewed By: sivachandra, zimmermann6

Differential Revision: https://reviews.llvm.org/D121440

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[libc] Add testing macros for errno and floating point exceptions.

Add testing macros for errno and floating point exceptions.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.

[libc] Add testing macros for errno and floating point exceptions.

Add testing macros for errno and floating point exceptions.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D121235

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[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

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[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

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[libc][NFC] Move test related pieces from FPUtil to util/UnitTest.

Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D112673

[libc][nfc] move ctype_utils and FPUtils to __support

Some ctype functions are called from other libc functions (e.g. isspace
is used in atoi). By moving ctype_utils.h to __support it becomes easier

[libc][nfc] move ctype_utils and FPUtils to __support

Some ctype functions are called from other libc functions (e.g. isspace
is used in atoi). By moving ctype_utils.h to __support it becomes easier
to include just the implementations of these functions. For these
reasons the implementation for isspace was moved into
ctype_utils as well.

FPUtils was moved to simplify the build order, and to clarify which
files are a part of the actual libc.

Many files were modified to accomodate these changes, mostly changing
the #include paths.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D107600

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[libc][NFC] Remove few deprecated FPUtil header files and test patterns.

Few tests have been converted to the new test patterns to facilitate
this.

[libc] Remove redundant header files included from internal paths.

[libc][NFC] add "LlvmLibc" as a prefix to all test names

Summary:
Having a consistent prefix makes selecting all of the llvm libc tests
easier on any platform that is also using the gtest framework.

[libc][NFC] add "LlvmLibc" as a prefix to all test names

Summary:
Having a consistent prefix makes selecting all of the llvm libc tests
easier on any platform that is also using the gtest framework.
This also modifies the TEST and TEST_F macros to enforce this change
moving forward.

Reviewers: sivachandra

Subscribers:

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[libc] Switch functions to using global headers

This switches all of the files in src/string, src/math, and
test/src/math from using relative paths (e.g. `#include “include/string.h”`)
to global pat

[libc] Switch functions to using global headers

This switches all of the files in src/string, src/math, and
test/src/math from using relative paths (e.g. `#include “include/string.h”`)
to global paths (e.g. `#include <string.h>`) to make bringing up those
functions on other platforms, such as fuchsia, easier.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D91394

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[libc][NFC] Switch math tests to the new ULP based tolerance.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D86267

[lib][NFC] Split the floating point util functions into multiple files.

The grouping now reflects the grouping on cppreference.com.

[libc][NFC][Obvious] Convert the MPFR operations enum to an enum class.

This was suggested in https://reviews.llvm.org/D79149.

[libc] Move implementations of expf and exp2f from the AOR to src/math.

Reviewers: phosek

Differential Revision: https://reviews.llvm.org/D79149