[flang] Add UNSIGNED (#113504)

Implement the UNSIGNED extension type and operations under control of a
language feature flag (-funsigned).

This is nearly identical to the UNSIGNED feature that h

[flang] Add UNSIGNED (#113504)

Implement the UNSIGNED extension type and operations under control of a
language feature flag (-funsigned).

This is nearly identical to the UNSIGNED feature that has been available
in Sun Fortran for years, and now implemented in GNU Fortran for
gfortran 15, and proposed for ISO standardization in J3/24-116.txt.

See the new documentation for details; but in short, this is C's
unsigned type, with guaranteed modular arithmetic for +, -, and *, and
the related transformational intrinsic functions SUM & al.

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Reland "[flang][runtime] Use cuda::std::complex in F18 runtime CUDA build. (#109078)" (#109207)

`std::complex` operators do not work for the CUDA device compilation
of F18 runtime. This change make

Reland "[flang][runtime] Use cuda::std::complex in F18 runtime CUDA build. (#109078)" (#109207)

`std::complex` operators do not work for the CUDA device compilation
of F18 runtime. This change makes use of `cuda::std::complex` from
`libcudacxx`.
`cuda::std::complex` does not have specializations for `long double`,
so the change is accompanied with a clean-up for `long double` usage.

Additional change on top of #109078 is to use `cuda::std::complex`
only for the device compilation, otherwise the host compilation
fails because `libcudacxx` may not support `long double` specialization
at all (depending on the compiler).

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Revert "[flang][runtime] Use cuda::std::complex in F18 runtime CUDA build." (#109173)

Reverts llvm/llvm-project#109078

[flang][runtime] Use cuda::std::complex in F18 runtime CUDA build. (#109078)

`std::complex` operators do not work for the CUDA device compilation
of F18 runtime. This change makes use of `cuda::std

[flang][runtime] Use cuda::std::complex in F18 runtime CUDA build. (#109078)

`std::complex` operators do not work for the CUDA device compilation
of F18 runtime. This change makes use of `cuda::std::complex` from
`libcudacxx`.
`cuda::std::complex` does not have specializations for `long double`,
so the change is accompanied with a clean-up for `long double` usage.

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[flang][runtime] Correct RANDOM_INIT seed generation (#106250)

The initial seed was generated from a bitwise AND ("&") of two
clock-generated values, instead of an XOR or (best) a truncated integer

[flang][runtime] Correct RANDOM_INIT seed generation (#106250)

The initial seed was generated from a bitwise AND ("&") of two
clock-generated values, instead of an XOR or (best) a truncated integer
multiplication. Maybe I mistyped a shift-7 instead of a shift-6 or
shift-8 when I wrote that line, but it was most likely just stupidity.

Fixes https://github.com/llvm/llvm-project/issues/106221.

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[flang][runtime] Added Fortran::common::optional for use on device.

This is a simplified implementation of std::optional that can be used
in the offload builds for the device code. The methods are p

[flang][runtime] Added Fortran::common::optional for use on device.

This is a simplified implementation of std::optional that can be used
in the offload builds for the device code. The methods are properly
marked with RT_API_ATTRS so that the device compilation succedes.

Reviewers: klausler, jeanPerier

Reviewed By: jeanPerier

Pull Request: https://github.com/llvm/llvm-project/pull/85177

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[flang] Moved REAL(16) RANDOM_NUMBER to Float128Math library. (#85002)

[flang] Cleanup of NYI messages (#73740)

This update makes the user visible messages relating to features that
are not yet implemented be more consistent. I also cleaned up some of
the code.

Fo

[flang] Cleanup of NYI messages (#73740)

This update makes the user visible messages relating to features that
are not yet implemented be more consistent. I also cleaned up some of
the code.

For NYI messages that refer to intrinsics, I made sure the the message
begins with "not yet implemented: intrinsic:" to make them easier to
recognize.

I created some utility functions for NYI reporting that I put into
.../include/Optimizer/Support/Utils.h. These mainly convert MLIR types
to their Fortran equivalents.

I converted the NYI code to use the newly created utility functions.

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[flang][runtime] Better non-repeatable RANDOM_INIT() (#67363)

Use a higher-frequency clock base when initializing the pseudo-random
number generator to implement
CALL RANDOM_INIT(REPEATABLE=.FA

[flang][runtime] Better non-repeatable RANDOM_INIT() (#67363)

Use a higher-frequency clock base when initializing the pseudo-random
number generator to implement
CALL RANDOM_INIT(REPEATABLE=.FALSE.)

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[flang] Quadmath 128 bit floating point intrinsics

This update allows constant folding for many 128 bit floating point intrinsics
through the library quadmath, which is only available on some platfo

[flang] Quadmath 128 bit floating point intrinsics

This update allows constant folding for many 128 bit floating point intrinsics
through the library quadmath, which is only available on some platforms.

Differential Revision: https://reviews.llvm.org/D156435

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[flang] Intrinsic RANDOM_SEED calls with dynamically absent/present arguments

[flang][runtime] Use __float128 where possible & needed in runtime

On targets with __float128 available and distinct from long double,
use it to support more kind=16 entry points. This affects most

[flang][runtime] Use __float128 where possible & needed in runtime

On targets with __float128 available and distinct from long double,
use it to support more kind=16 entry points. This affects mostly
x86-64 targets. This means that more runtime entry points are
defined for lowering to call.

Delete Common/long-double.h and its LONG_DOUBLE macro in favor of
testing the standard macro LDBL_MANT_DIG.

Differential Revision: https://reviews.llvm.org/D127025

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[flang][runtime] Don't let random seed queries change the sequence

When the current seed of the pseudo-random generator is queried
with CALL RANDOM_SEED(GET=n), that query should not change the
stre

[flang][runtime] Don't let random seed queries change the sequence

When the current seed of the pseudo-random generator is queried
with CALL RANDOM_SEED(GET=n), that query should not change the
stream of pseudo-random numbers produced by CALL RANDOM_NUMBER().

Differential Revision: https://reviews.llvm.org/D127023

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[flang][runtime] Ensure that 0. <= RANDOM_NUMBER() < 1.

It was possible for RANDOM_NUMBER() to return 1.0.

Differential Revision: https://reviews.llvm.org/D127020

[flang] Change "bad kind" messages in the runtime to "not yet implemented"

Similar to change D125046.

If a programmer is able to compile and link a program that contains types that
are not yet supp

[flang] Change "bad kind" messages in the runtime to "not yet implemented"

Similar to change D125046.

If a programmer is able to compile and link a program that contains types that
are not yet supported by the runtime, it must be because they're not yet
implemented.

This change will make it easier to find unimplemented code in tests.

Differential Revision: https://reviews.llvm.org/D125267

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[flang] Improve runtime crash messages

Where possible, I added additional information to the messages to help
programmers figure out what went wrong. I also removed all uses of the word
"bad" from

[flang] Improve runtime crash messages

Where possible, I added additional information to the messages to help
programmers figure out what went wrong. I also removed all uses of the word
"bad" from the messages since (to me) that implies a moral judgement rather
than a programming error. I replaced it with either "invalid" or "unsupported"
where appropriate.

Differential Revision: https://reviews.llvm.org/D121493

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[flang] Move runtime API headers to flang/include/flang/Runtime

Move the closure of the subset of flang/runtime/*.h header files that
are referenced by source files outside flang/runtime (apart from

[flang] Move runtime API headers to flang/include/flang/Runtime

Move the closure of the subset of flang/runtime/*.h header files that
are referenced by source files outside flang/runtime (apart from unit tests)
into a new directory (flang/include/flang/Runtime) so that relative
include paths into ../runtime need not be used.

flang/runtime/pgmath.h.inc is moved to flang/include/flang/Evaluate;
it's not used by the runtime.

Differential Revision: https://reviews.llvm.org/D109107

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[flang] Fixed simple typo in runtime code

Reviewed By: klausler

Differential Revision: https://reviews.llvm.org/D104034

[flang] Fix narrowing warning on macos

With clang 11 on macos we were getting this warning:
```
flang/runtime/random.cpp:61:30: error: non-constant-expression cannot be narrowed from type 'unsigned

[flang] Fix narrowing warning on macos

With clang 11 on macos we were getting this warning:
```
flang/runtime/random.cpp:61:30: error: non-constant-expression cannot be narrowed from type 'unsigned long long' to 'runtime::GeneratedWord' (aka 'unsigned int') in initializer list [-Wc++11-narrowing]
GeneratedWord word{(generator() - generator.min()) & rangeMask};
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
flang/runtime/random.cpp:99:5: note: in instantiation of function template specialization 'runtime::Generate<double, 53>' requested here
Generate<CppTypeFor<TypeCategory::Real, 8>, 53>(harvest);
^
```

Changing the type of `rangeMask` fixes it.

Differential Revision: https://reviews.llvm.org/D100320

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[flang] RANDOM_NUMBER, RANDOM_SEED, RANDOM_INIT in runtime

Add APIs, initial non-coarray implementations, and unit
tests for the intrinsic subroutines for pseudo-random
number generation.

Different

[flang] RANDOM_NUMBER, RANDOM_SEED, RANDOM_INIT in runtime

Add APIs, initial non-coarray implementations, and unit
tests for the intrinsic subroutines for pseudo-random
number generation.

Differential Revision: https://reviews.llvm.org/D100064

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