[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 headers for fenv types. (#88467)

Fixes #88187

[libc] Start to refactor riscv platform abstraction to support both 32 and 64 bits versions

This patch enables the compilation of libc for rv32 by unifying the
current rv64 and rv32 implementation i

[libc] Start to refactor riscv platform abstraction to support both 32 and 64 bits versions

This patch enables the compilation of libc for rv32 by unifying the
current rv64 and rv32 implementation into a single rv implementation.

We updated the cmake file to match the new riscv32 arch and force
LIBC_TARGET_ARCHITECTURE to be "riscv" whenever we find "riscv32" or
"riscv64". This is required as LIBC_TARGET_ARCHITECTURE is used in the
path for several platform specific implementations.

Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D148797

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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] Add riscv64 fenv implementation and enable the fenv.h functions.

Reviewed By: mikhail.ramalho

Differential Revision: https://reviews.llvm.org/D145560

[libc] Add arm 32 FEnvImpl.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D145347

[libc][NFC] Move architectures.h to properties subfolder

[libc][NFC] Rename macros

[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] Rename architecture macros and move to macros folder

[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] 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] Add more robust compile time architecture detection

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

[libc] Add more robust compile time architecture detection

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

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

This reverts commit a72e2499865b55cb007b63673100c06cc85faf97.

[libc] Add more robust compile time architecture detection

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

[libc] Add more robust compile time architecture detection

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

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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] Skip fenv exception tests on aarch64 if HW doesn't support exceptions.

Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D109538

[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] Move FPExceptMatcher out of TestHelpers.h

TestHelpers.h pulls few pieces from LLVM libc's unittest framework
which aren't available on platforms like Fuchsia which use their own
unittest fram

[libc] Move FPExceptMatcher out of TestHelpers.h

TestHelpers.h pulls few pieces from LLVM libc's unittest framework
which aren't available on platforms like Fuchsia which use their own
unittest framework. So, by moving FPExceptMatcher to a different file
we can exclude LLVM libc specific pieces in a cleaner way.

In a later pass, it might make more sense to rename TestHelpers.h also
to FPMatcher.h. That way, we can make macros like EXPECT_FP_EQ to be
equivalent to EXPECT_EQ on platforms like Fuchsia.

Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D107129

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[libc] Accommodate Fuchsia's death test framework in fenv tests.

Fuchsia's death test framework runs the closure which can die in a
different thread. Hence, the FP exceptions which cause the closure

[libc] Accommodate Fuchsia's death test framework in fenv tests.

Fuchsia's death test framework runs the closure which can die in a
different thread. Hence, the FP exceptions which cause the closure to
die should be enalbed in the closure.

Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D106683

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[libc] Rename FEnv.h and refactor subsequent files

Because Windows's pathnames are not case sensitive,
to avoid include conflicts between our header file FEnv.h and the
one from the C Standard libra

[libc] Rename FEnv.h and refactor subsequent files

Because Windows's pathnames are not case sensitive,
to avoid include conflicts between our header file FEnv.h and the
one from the C Standard library, <fenv.h>, the prior file was renamed.
The motive for the relabel came to fix this include error in
TestHelpers.cpp since a conflict arose with a file in the same
directory when #include <fenv.h> was being used.

Reviewed By: sivachandra, aeubanks

Differential Revision: https://reviews.llvm.org/D106470

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[libc] Add a new test matcher for tests raising floating point exceptions.

This new matcher does not use death tests to check if SIGFPE is raised.
Instead, that a SIGFPE was raised is checked using

[libc] Add a new test matcher for tests raising floating point exceptions.

This new matcher does not use death tests to check if SIGFPE is raised.
Instead, that a SIGFPE was raised is checked using a SIGFPE signal handler.

Reviewed By: mcgrathr

Differential Revision: https://reviews.llvm.org/D106086

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[libc] Add implementations of the remaining fenv functions.

Namely, implementations of fegetexceptfflag, fesetexceptflag,
fegetenv, fesetenv, feholdexcept and feupdateenv have been added.

Reviewed

[libc] Add implementations of the remaining fenv functions.

Namely, implementations of fegetexceptfflag, fesetexceptflag,
fegetenv, fesetenv, feholdexcept and feupdateenv have been added.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D96935

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