derek.holloway
7502bf64a4
CodeQL / Analyze (actions) (push) Canceled after 0s
CodeQL / Analyze (python) (push) Canceled after 0s
pre-commit / pre-commit (push) Canceled after 0s
Multi-Arch CI / setup (push) Canceled after 0s
Publish build_manylinux_x86_64 images / publish_build_manylinux_x86_64 (push) Canceled after 0s
Setup (Multi-Arch) / setup (push) Canceled after 0s
Multi-Arch CI / Linux::${{ fromJSON(needs.setup.outputs.linux_build_config || '{}').build_variant_label || 'skip' }} (push) Canceled after 0s
Publish TheRock Docker image / build-and-push-image (push) Canceled after 0s
Publish no_rocm_image_ubi10 image / publish_no_rocm_image_ubi10 (push) Canceled after 0s
Multi-Arch CI / Windows::${{ fromJSON(needs.setup.outputs.windows_build_config || '{}').build_variant_label || 'skip' }} (push) Canceled after 0s
Publish TheRock Docker image / build-and-push-image (push) Canceled after 0s
Multi-Arch CI / Manifest Diff (push) Canceled after 0s
TheRock Manifest Diff Report / Generate Manifest Diff Report (push) Canceled after 0s
Multi-Arch CI / CI Summary (push) Canceled after 0s
Publish no_rocm_image_ubuntu24_04 images / publish_no_rocm_image_ubuntu24_04 (push) Canceled after 0s
Publish no_rocm_image_ubuntu24_04_ocl_rt images / publish_no_rocm_image_ubuntu24_04_ocl_rt (push) Canceled after 0s
Publish TheRock Docker image / build-and-push-image (push) Canceled after 0s
Publish TheRock Docker image / build-and-push-image (push) Canceled after 0s
Publish no_rocm_image_ubuntu24_04 images / publish_no_rocm_image_ubuntu24_04_rocgdb (push) Canceled after 0s
Publish no_rocm_image_ubuntu24_04_rocgdb images / publish_no_rocm_image_ubuntu24_04_rocgdb (push) Canceled after 0s
Publish no_rocm_image_ubuntu24_04 images / publish_no_rocm_image_ubuntu24_04_ocl_rt (push) Canceled after 0s
Publish TheRock Docker image / build-and-push-image (push) Canceled after 0s
Unit Tests / Unit Tests :: ubuntu-24.04 (push) Canceled after 0s
Unit Tests / Unit Tests :: windows-2022 (push) Canceled after 0s
Publish no_rocm_image_ubuntu24_04 images / publish_no_rocm_image_ubuntu24_04_media (push) Canceled after 0s
Unit Tests / Unit Tests Summary (push) Canceled after 0s
Publish no_rocm_image_ubuntu24_04 images / publish_no_rocm_image_ubuntu24_04_openmpi (push) Canceled after 0s
117 lines
8.4 KiB
Markdown
117 lines
8.4 KiB
Markdown
<!--===- docs/FortranStandardsSupport.md
|
|
|
|
Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
See https://llvm.org/LICENSE.txt for license information.
|
|
SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
|
|
-->
|
|
|
|
# Flang Fortran Standards Support
|
|
|
|
```{contents}
|
|
---
|
|
local:
|
|
---
|
|
```
|
|
|
|
This document summarizes Fortran standards support in Flang. The information is only provided as a guideline. The
|
|
TODOs/Not Yet Implemented messages emitted by the compiler for unimplemented features should be treated as authoritative.
|
|
|
|
The standards support information is provided as a table with three columns that are self explanatory.
|
|
The Status column uses the letters **Y**, **P**, **N** for the implementation status:
|
|
- **Y** : Yes. When the implementation is complete
|
|
- **P** : Partial. When the implementation is incomplete for a few cases
|
|
- **N** : No. When the implementation is absent
|
|
|
|
There is no distinction made between support in the Parser/Semantics and the MLIR or Lowering stages.
|
|
|
|
Note: The two major missing features in Flang at present are coarrays and parameterized derived types (PDTs) with length type parameters.
|
|
|
|
|
|
## Fortran 2023
|
|
See [document](F202X.md) for a brief discussion about the new features in Fortran 2023. The following table summarizes the
|
|
status of all important Fortran 2023 features. The table entries are based on the document [The new features in Fortran 2023](https://wg5-fortran.org/N2201-N2250/N2212.pdf).
|
|
|
|
| Feature | Status | Comments |
|
|
|------------------------------------------------------------|--------|---------------------------------------------------------|
|
|
| Allow longer statement lines and overall statement length | Y | |
|
|
| Automatic allocation of lengths of character variables | N | |
|
|
| The specifiers typeof and classof | Y | |
|
|
| Conditional expressions and arguments | N | |
|
|
| More use of boz constants | P | All usages other than enum are supported |
|
|
| Intrinsics for extracting tokens from a string | Y | |
|
|
| Intrinsics for Trig functions that work in degrees | Y | |
|
|
| Intrinsics for Trig functions that work in half revolutions| Y | |
|
|
| Changes to system_clock | N | |
|
|
| Changes for conformance with the new IEEE standard | Y | |
|
|
| Additional named constants to specify kinds | Y | |
|
|
| Extensions for c_f_pointer intrinsic | Y | |
|
|
| Procedures for converting between fortran and c strings | N | |
|
|
| The at edit descriptor | N | |
|
|
| Control over leading zeros in output of real values | Y | |
|
|
| Extensions for Namelist | N | |
|
|
| Allow an object of a type with a coarray ultimate component to be an array or allocatable | N | |
|
|
| Put with Notify | N | |
|
|
| Error conditions in collectives | N | |
|
|
| Simple procedures | N | |
|
|
| Using integer arrays to specify subscripts | N | |
|
|
| Using integer arrays to specify rank and bound of an array | N | |
|
|
| Using an integer constant to specify rank | Y | |
|
|
| Reduction specifier for do concurrent | P | Syntax is accepted |
|
|
| Enumerations | N | |
|
|
|
|
## Fortran 2018
|
|
All features except those listed in the following table are supported. Almost all of the unsupported features are related to
|
|
the multi-image execution. The table entries are based on the document [The new features in Fortran 2018](https://wg5-fortran.org/N2151-N2200/ISO-IECJTC1-SC22-WG5_N2161_The_New_Features_of_Fortran_2018.pdf).
|
|
|
|
| Feature | Status | Comments |
|
|
|------------------------------------------------------------|--------|---------------------------------------------------------|
|
|
| Asynchronous communication | P | Syntax is accepted |
|
|
| Collective subroutines | P | Experimental support via [PRIF](ParallelMultiImageFortranRuntime.md), missing co_reduce |
|
|
| Teams | P | Experimental support via [PRIF](ParallelMultiImageFortranRuntime.md) |
|
|
| Form team statement | P | Experimental support via [PRIF](ParallelMultiImageFortranRuntime.md) |
|
|
| Change team construct | P | Experimental support via [PRIF](ParallelMultiImageFortranRuntime.md) |
|
|
| Sync team construct | P | Experimental support via [PRIF](ParallelMultiImageFortranRuntime.md) |
|
|
| Intrinsic functions get_team and team_number | P | Experimental support via [PRIF](ParallelMultiImageFortranRuntime.md) |
|
|
| Intrinsic function image_index | P | Experimental support via [PRIF](ParallelMultiImageFortranRuntime.md) |
|
|
| Intrinsic function num_images | P | Experimental support via [PRIF](ParallelMultiImageFortranRuntime.md) |
|
|
| Intrinsic function this_image | P | Experimental support via [PRIF](ParallelMultiImageFortranRuntime.md) |
|
|
| Image failure and stat= specifiers | P | Multi-image/Coarray feature. stat_failed_image is added |
|
|
| Coarrays allocated in teams | N | Multi-image/Coarray feature |
|
|
| Critical construct | N | Multi-image/Coarray feature |
|
|
| Lock and unlock statements | N | Multi-image/Coarray feature |
|
|
| Events | N | Multi-image/Coarray feature |
|
|
| Image selectors | N | Multi-image/Coarray feature |
|
|
| Intrinsic move_alloc extensions | P | Multi-image/Coarray feature |
|
|
| Detecting failed and stopped images | N | Multi-image/Coarray feature |
|
|
| New and enhanced atomic subroutines | N | Multi-image/Coarray feature |
|
|
| Intrinsic function coshape | N | Multi-image/Coarray feature |
|
|
|
|
## Fortran 2008
|
|
All features except those listed in the following table are supported.
|
|
|
|
| Feature | Status | Comments |
|
|
|------------------------------------------------------------|--------|---------------------------------------------------------|
|
|
| Coarrays | N | Lowering and runtime support is not implemented |
|
|
| do concurrent | P | Sequential execution works. Parallel support in progress|
|
|
| Internal procedure as an actual argument or pointer target | Y | Current implementation requires stack to be executable. See [FAQ](FAQ.md#why-do-i-get-a-warning-or-an-error-about-an-executable-stack) and [Proposal](InternalProcedureTrampolines.md) |
|
|
|
|
## Fortran 2003
|
|
All features except those listed in the following table are supported.
|
|
|
|
| Feature | Status | Comments |
|
|
|------------------------------------------------------------|--------|---------------------------------------------------------|
|
|
| Parameterized Derived Types | P | PDT with length type parameters is not supported. See [Proposal](ParameterizedDerivedTypes.md) |
|
|
| Assignment to allocatable | P | Assignment to whole allocatable in FORALL is not implemented |
|
|
| Asynchronous input/output | P | IO will happen synchronously |
|
|
| MIN/MAX extensions for CHARACTER | P | Some variants are not supported |
|
|
|
|
## Fortran 95
|
|
All features are supported.
|
|
|
|
## Fortran 90
|
|
All features are supported.
|
|
|
|
## FORTRAN 77
|
|
All features are supported.
|