[libc] Fix fpbits test running 80bit ld everywhere (#115937)

After #115084 the 80 bit long double tests error if sizeof(long double)
isn't 96 or 128 bits. This caused failures in long double is dou

[libc] Fix fpbits test running 80bit ld everywhere (#115937)

After #115084 the 80 bit long double tests error if sizeof(long double)
isn't 96 or 128 bits. This caused failures in long double is double
systems (since long double is 64 bits) so I've disabled the 80 bit long
double tests on systems that don't use them.

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[libc][i386] FPBit support for 96b long double (#115084)

`long double` is haunted on most architectures, but it is especially so on
i386-linux-gnu. While have 80b of significant data, on i386-linux-

[libc][i386] FPBit support for 96b long double (#115084)

`long double` is haunted on most architectures, but it is especially so on
i386-linux-gnu. While have 80b of significant data, on i386-linux-gnu this type
has 96b of storage.

Fixes for supporting printf family of conversions for `long double` on
i386-linux-gnu. This allows the libc-stdlib-tests and libc_stdio_unittests
ninja target tests to pass on i386-linux-gnu.

Fixes: #110894
Link: #93709
Co-authored-by: Michael Jones <michaelrj@google.com>

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[libc] Move struct Sign into LIBC_NAMESPACE (#110709)

The struct Sign should be in the correct namespace. Also update the
various tests that use it.

[libc] Add osutils for Windows and make libc and its tests build on Windows target (#104676)

This PR first adds osutils for Windows, and changes some libc code to
make libc and its tests build on t

[libc] Add osutils for Windows and make libc and its tests build on Windows target (#104676)

This PR first adds osutils for Windows, and changes some libc code to
make libc and its tests build on the Windows target. It then temporarily
disables some libc tests that are currently problematic on Windows.

Specifically, the changes besides the addition of osutils include:

- Macro `LIBC_TYPES_HAS_FLOAT16` is disabled on Windows. `clang-cl`
generates calls to functions in `compiler-rt` to handle float16
arithmetic and these functions are currently not linked in on Windows.
- Macro `LIBC_TYPES_HAS_INT128` is disabled on Windows.
- The invocation to `::aligned_malloc` is changed to an invocation to
`::_aligned_malloc`.
- The following unit tests are temporarily disabled because they
currently fail on Windows:
- `test.src.__support.big_int_test`
- `test.src.__support.arg_list_test`
- `test.src.fenv.getenv_and_setenv_test`
- Tests involving `__m128i`, `__m256i`, and `__m512i` in
`test.src.string.memory_utils.op_tests.cpp`
- `test_range_errors` in `libc/test/src/math/smoke/AddTest.h` and
`libc/test/src/math/smoke/SubTest.h`

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[libc] Fix warnings emitted by GCC (#98751)

Fixes #98709.

[libc][NFC] Move `Sign` type to separate header (#85930)

[libc][NFC] Clean up stray ';' and default enum warning

Summary:
Cleans up two warnings I get locally while building.

[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::

[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.

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[libc][NFC] Rename `LIBC_LONG_DOUBLE_IS_` macros (#83399)

Umbrella bug #83182

[libc][NFC] Rename `LIBC_COMPILER_HAS_FLOAT128` to `LIBC_TYPES_HAS_FLOAT128` (#83395)

Umbrella bug #83182

[libc] add FXBits class (#82065)

The FXBits class is what will be used to modify fixed point numbers on a
bit level. This patch adds a basic implementation as well as basic
tests.

[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] Add user defined literals to initialize `BigInt` and `__uint128_t` constants (#81267)

Adds user defined literal to construct unsigned integer constants. This
is useful when constructing cons

[libc] Add user defined literals to initialize `BigInt` and `__uint128_t` constants (#81267)

Adds user defined literal to construct unsigned integer constants. This
is useful when constructing constants for non native C++ types like
`__uint128_t` or our custom `BigInt` type.

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[libc][NFC] Fix few warnings in tests. (#81262)

```
/usr/local/google/home/lntue/experiment/llvm/llvm-project/libc/test/src/__support/FPUtil/fpbits_test.cpp:268:2: warning: extra ';' outside of a f

[libc][NFC] Fix few warnings in tests. (#81262)

```
/usr/local/google/home/lntue/experiment/llvm/llvm-project/libc/test/src/__support/FPUtil/fpbits_test.cpp:268:2: warning: extra ';' outside of a function is incompatible with C++98 [-Wc++98-compat-extra-semi]
};
^
1 warning generated.
```

```
In file included from /usr/local/google/home/lntue/experiment/llvm/llvm-project/libc/test/src/sys/socket/linux/bind_test.cpp:17:
/usr/local/google/home/lntue/experiment/llvm/llvm-project/libc/test/UnitTest/Test.h:17:9: warning: 'libc_make_test_file_path' macro redefined [-Wmacro-redefined]
#define libc_make_test_file_path(file_name) (file_name)
^
/usr/local/google/home/lntue/experiment/llvm/llvm-project/libc/test/UnitTest/LibcTest.h:20:9: note: previous definition is here
#define libc_make_test_file_path(file_name) \
^
1 warning generated.
```

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[libc] Add `next_toward_inf` fo `FPBits` (#80654)

It is needed to provide correct rounding when building FPRep from
greater precision representations.

[libc][NFC] Make FPRep more testable (#80453)

[libc][NFC] Rename `FPBits` nan functions (#79998)

- [libc][NFC] Rename FPBits nan functions
- rename build_signaling_nan in signaling_nan
- rename build_quiet_nan to quiet_nan

[libc] Add test to check all properties for all FPBit types. (#79851)

This test is platform agnostic, it runs all tests on all architectures.

[libc] Remove specific nan payload in math functions (#79165)

[libc] Remove specific nan payload in math functions (#79133)

[reland][libc] Remove unnecessary `FPBits` functions and properties (#79128)

- reland #79113
- Fix aarch64 RISC-V build