[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][math][c23] Add MPFR unit tests for {rint,lrint,llrint,lround,llround}f16 (#94473)

[libc] Make fenv and math tests preserve fenv_t state (#89658)

This adds a new test fixture class FEnvSafeTest (usable as a base
class for other fixtures) that ensures each test doesn't perturb
th

[libc] Make fenv and math tests preserve fenv_t state (#89658)

This adds a new test fixture class FEnvSafeTest (usable as a base
class for other fixtures) that ensures each test doesn't perturb
the `fenv_t` state that the next test will start with. It also
provides types and methods tests can use to explicitly wrap code
under test either to check that it doesn't perturb the state or
to save and restore the state around particular test code.

All the fenv and math tests are updated to use this so that none
can affect another. Expectations that code under test and/or
tests themselves don't perturb state can be added later.

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[libc] Add proxy header for fenv.h macro constants. #87863 (#87896)

Hello, this addresses #87863.

[libc] Add proxy header math_macros.h. (#87598)

Context: https://github.com/llvm/llvm-project/pull/87017

- Add proxy header `libc/hdr/math_macros.h` that will:
- include `<math.h>` in overlay mod

[libc] Add proxy header math_macros.h. (#87598)

Context: https://github.com/llvm/llvm-project/pull/87017

- Add proxy header `libc/hdr/math_macros.h` that will:
- include `<math.h>` in overlay mode,
- include `"include/llvm-libc-macros/math-macros.h"` in full build mode.
- Its corresponding CMake target `libc.hdr.math_macros` will only depend
on `libc.include.math` and `libc.include.llvm-libc-macros.math_macros`
in full build mode.
- Replace all `#include "include/llvm-libc-macros/math-macros.h"` with
`#include "hdr/math_macros.h"`.
- Add dependency to `libc.hdr.math_macros` CMake target when using
`add_fp_unittest`.
- Update the remaining dependency.
- Update bazel overlay: add `libc:hdr_math_macros` target, and replacing
all dependency on `libc:llvm_libc_macros_math_macros` with
`libc:hdr_math_macros`.

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

[libc] Remove direct math.h includes (#85324)

Reland of #84991

A downstream overlay mode user ran into issues with the isnan macro not
working in our sources with a specific libc configuration. Thi

[libc] Remove direct math.h includes (#85324)

Reland of #84991

A downstream overlay mode user ran into issues with the isnan macro not
working in our sources with a specific libc configuration. This patch
replaces the last direct includes of math.h with our internal
math_macros.h, along with the necessary build system changes.

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[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][NFC] Remove `FPBits` cast operator (#79142)

The semantics for casting can range from "bitcast" (same representation)
to "different representation", to "type promotion". Here we remove the
c

[libc][NFC] Remove `FPBits` cast operator (#79142)

The semantics for casting can range from "bitcast" (same representation)
to "different representation", to "type promotion". Here we remove the
cast operator and force usage of `get_val` as the only function to get
the floating point value, making the intent clearer and more consistent.

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[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

Revert "[libc] Remove unnecessary `FPBits` functions and properties" (#79118)

Reverts llvm/llvm-project#79113
It broke aarch64 build bot machines.

[libc] Remove unnecessary `FPBits` functions and properties (#79113)

This patch reduces the surface of `FPBits`.

[libc][NFC] Introduce a Sign type for FPBits (#78500)

Another patch is needed to cover `DyadicFloat` and `NormalFloat`
constructors.

[libc][NFC] Rename `MANTISSA_WIDTH` in `FRACTION_LEN` (#75489)

This one might be a bit controversial since the terminology has been
introduced from the start but I think `FRACTION_LEN` is a better

[libc][NFC] Rename `MANTISSA_WIDTH` in `FRACTION_LEN` (#75489)

This one might be a bit controversial since the terminology has been
introduced from the start but I think `FRACTION_LEN` is a better name
here. AFAICT it really is "the number of bits after the decimal dot when
the number is in normal form."

`MANTISSA_WIDTH` is less precise as it's unclear whether we take the
leading bit into account.
This patch also renames most of the properties to use the `_LEN` suffix
and fixes useless casts or variables.

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[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] Fix libmath test compilation when using UInt<T>

This patch:
(1) adds the add_with_carry_const and sub_with_borrow_const constexpr calls
to add and sub, respectively. Both add and sub are cons

[libc] Fix libmath test compilation when using UInt<T>

This patch:
(1) adds the add_with_carry_const and sub_with_borrow_const constexpr calls
to add and sub, respectively. Both add and sub are constexpr calls and
were call the non-constexpr version of add/sub_with_borrow.
(2) adds explicit UIntType construct calls in some fp tests.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D150223

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[libc] Reduce math tests runtime further

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D151875

[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] Resolve NaN/implementation-defined behavior of floating-point tests

Differential Revision: https://reviews.llvm.org/D134917

Revert "[libc] Resolve NaN/implementation-defined behavior of floating-point tests"

This reverts commit 5470b1fcb5754b45c1233df7759411ff56942d6e.

[libc] Resolve NaN/implementation-defined behavior of floating-point tests

Differential Revision: https://reviews.llvm.org/D134917

[libc] Remove the redundant header FPUtil/FEnvUtils.h

Remove the redundant header FPUtil/FEnvUtils.h, use FPUtil/FEnvImpl.h header instead.

Reviewed By: sivachandra

Differential Revision: https://

[libc] Remove the redundant header FPUtil/FEnvUtils.h

Remove the redundant header FPUtil/FEnvUtils.h, use FPUtil/FEnvImpl.h header instead.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D120965

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[libc][obvious] Fix style of MPFRWrapper.

[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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