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Update multi image support documentation #177

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FortranStandardsSupport: Move incorrectly filed features
bonachea Jul 12, 2026
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FortranStandardsSupport: Update and expand multi-image support status
bonachea Jul 12, 2026
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30 changes: 16 additions & 14 deletions flang/docs/FortranStandardsSupport.md
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Expand Up @@ -50,9 +50,9 @@ status of all important Fortran 2023 features. The table entries are based on th
| 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 | |
| Allow an object of a type with a coarray ultimate component to be an array or allocatable | N | Multi-image/Coarray feature |
| Put with Notify | N | Multi-image/Coarray feature |
| Error conditions in collectives | P | Experimental support via [PRIF](ParallelMultiImageFortranRuntime.md) |
| Simple procedures | N | |
| Using integer arrays to specify subscripts | N | |
| Using integer arrays to specify rank and bound of an array | N | |
Expand All @@ -68,33 +68,35 @@ the multi-image execution. The table entries are based on the document [The new
|------------------------------------------------------------|--------|---------------------------------------------------------|
| 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) |
| Intrinsic function coshape | 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) |
| Change team construct | P | Experimental support via [PRIF](ParallelMultiImageFortranRuntime.md), missing coarray association |
| Sync team statement | 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 |
| Team arguments to other intrinsics | P | Experimental support via [PRIF](ParallelMultiImageFortranRuntime.md) |
| 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 |
| Image failure and stat= specifiers | P | Multi-image/Coarray feature. stat_failed_image is added |

## 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) |
| Intrinsic functions this_image, num_images | P | Experimental support via [PRIF](ParallelMultiImageFortranRuntime.md) |
| Sync all, sync images, sync memory statements | P | Experimental support via [PRIF](ParallelMultiImageFortranRuntime.md) |
| Non-allocatable save coarrays of intrinsic type | P | Experimental support via [PRIF](ParallelMultiImageFortranRuntime.md) |
| Other coarray data objects | N | Multi-image/Coarray feature |
| Intrinsic functions image_index, ucobound, lcobound | P | Experimental support via [PRIF](ParallelMultiImageFortranRuntime.md) |
| Image selectors (coindexed access) | N | Multi-image/Coarray feature |
| Atomic subroutines | N | Multi-image/Coarray feature |
| Lock and unlock statements | N | Multi-image/Coarray feature |

## Fortran 2003
All features except those listed in the following table are supported.
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