[libc][NFC] Rename `UInt.h` to `big_int.h` and `UInt128.h` to `uint128.h` for consistency (#87808)

[libc] fix another build failure from using limits.h (#84827)

My GCC build is failing with issues similar why we added our own. Looks
like
we missed one spot. See also:

commit 72ce62941579 ("[libc]

[libc] fix another build failure from using limits.h (#84827)

My GCC build is failing with issues similar why we added our own. Looks
like
we missed one spot. See also:

commit 72ce62941579 ("[libc] Add C23 limits.h header. (#78887)")

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[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 `c

[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.

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[reland][libc][NFC] Use user defined literals to build 128 and 256 bit constants (#81998)

- #81835
- Fix for platforms where uint64_t is not available

Revert "[reland][libc][NFC] Use user defined literals to build 128 and 256 bit constants" (#81882)

Reverts llvm/llvm-project#81835
This is breaking arm32 which does not support 64 bit types.

[reland][libc][NFC] Use user defined literals to build 128 and 256 bit constants (#81835)

This is a reland of #81746

Revert "[libc][NFC] Use user defined literals to build 128 and 256 bit constants." (#81771)

Reverts llvm/llvm-project#81746

[libc][NFC] Use user defined literals to build 128 and 256 bit constants. (#81746)

[libc] Mass replace enclosing namespace (#67032)

This is step 4 of
https://discourse.llvm.org/t/rfc-customizable-namespace-to-allow-testing-the-libc-when-the-system-libc-is-also-llvms-libc/73079

[libc] Better IntegerToString API

This patch is an alternative to D155902. It provides the following benefits:
- No buffer manual allocation and error handling for the general case
- More flexible

[libc] Better IntegerToString API

This patch is an alternative to D155902. It provides the following benefits:
- No buffer manual allocation and error handling for the general case
- More flexible API : width specifier, sign and prefix handling
- Simpler code

The more flexible API removes the need for manually tweaking the buffer afterwards, and so prevents relying on implementation details of IntegerToString.

Reviewed By: michaelrj, jhuber6

Differential Revision: https://reviews.llvm.org/D156981

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Revert "[libc] Better IntegerToString API"

This reverts commit 910cc05aae85a6b31e2a2ed87d3dd46db46fce04.

[libc] Better IntegerToString API

This patch is an alternative to D155902. It provides the following benefits:
- No buffer manual allocation and error handling for the general case
- More flexible

[libc] Better IntegerToString API

This patch is an alternative to D155902. It provides the following benefits:
- No buffer manual allocation and error handling for the general case
- More flexible API : width specifier, sign and prefix handling
- Simpler code

The more flexible API removes the need for manually tweaking the buffer afterwards, and so prevents relying on implementation details of IntegerToString.

Reviewed By: michaelrj, jhuber6

Differential Revision: https://reviews.llvm.org/D156981

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[libc] Extend IntegerToString to convert UInt* numbers to hex string.

This new functionality will help us avoid duplicated code in various
places in the testing infrastructure. Since the string repr

[libc] Extend IntegerToString to convert UInt* numbers to hex string.

This new functionality will help us avoid duplicated code in various
places in the testing infrastructure. Since the string representation
of the wide numbers is to be used by tests, to keep it simple, we
zero-pad the strings.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D150849

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[libc][NFC] Move UnitTest and IntegrationTest to the 'test' directory.

This part of the effort to make all test related pieces into the `test`
directory. This helps is excluding test related pieces

[libc][NFC] Move UnitTest and IntegrationTest to the 'test' directory.

This part of the effort to make all test related pieces into the `test`
directory. This helps is excluding test related pieces in a straight
forward manner if LLVM_INCLUDE_TESTS is OFF. Future patches will also move
the MPFR wrapper and testutils into the 'test' directory.

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[libc][NFC] Use STL case for string_view

[libc][NFC] Make IntegerToString simpler to use at call-sites.

Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D131943

[libc] add int to string for extended bases

The default IntegerToString class only supports base 10, this patch adds
a version which supports any base between 2 and 36 inclusive. This will
be used i

[libc] add int to string for extended bases

The default IntegerToString class only supports base 10, this patch adds
a version which supports any base between 2 and 36 inclusive. This will
be used in an upcoming patch.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D131301

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[libc] Support StringView equality tests

Previously, the integer_to_string tests used EXPECT_TRUE(.equals)
which doesn't have useful error messages. Now they properly check
equality with the EXPECT_

[libc] Support StringView equality tests

Previously, the integer_to_string tests used EXPECT_TRUE(.equals)
which doesn't have useful error messages. Now they properly check
equality with the EXPECT_EQ macro, which allows for comparing the
strings more naturally.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D131300

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[libc] Add a convenience class and function for integer to string conversion.

Printf's integer converter has been modified to use the new converter. In
future, it will be used to implement other par

[libc] Add a convenience class and function for integer to string conversion.

Printf's integer converter has been modified to use the new converter. In
future, it will be used to implement other parts of the libc.

Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D130227

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