[flang-commits] [flang] [Flang] Add a Fortran Standards Support doc (PR #132195)
Kiran Chandramohan via flang-commits
flang-commits at lists.llvm.org
Tue Apr 22 14:06:35 PDT 2025
https://github.com/kiranchandramohan updated https://github.com/llvm/llvm-project/pull/132195
>From a0460e711648d6508d6cd628e511b726e4d38fb5 Mon Sep 17 00:00:00 2001
From: Kiran Chandramohan <kiran.chandramohan at arm.com>
Date: Thu, 20 Mar 2025 12:05:40 +0000
Subject: [PATCH 01/11] [Flang] Add a Fortran Standards Support doc
---
flang/docs/FortranStandardsSupport.md | 63 +++++++++++++++++++++++++++
flang/docs/index.md | 1 +
2 files changed, 64 insertions(+)
create mode 100644 flang/docs/FortranStandardsSupport.md
diff --git a/flang/docs/FortranStandardsSupport.md b/flang/docs/FortranStandardsSupport.md
new file mode 100644
index 0000000000000..5261633edc578
--- /dev/null
+++ b/flang/docs/FortranStandardsSupport.md
@@ -0,0 +1,63 @@
+<!--===- 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's Fortran standards support
+
+```{contents}
+---
+local:
+---
+```
+
+This document summarizes Flang's Fortran standards support. The information is only provided as a guideline. The compiler emits
+TODOs/Not Yet Implemented messages for unimplemented features and that should be treated as the authoratative information.
+Standards support is provided upto Fortran 2008 for now. It will be later extended for Fortran 2018 and Fortran 2023.
+
+The standards support information is provided as a table with three columns that are self explanatory. The Status column uses
+the letters **P**, **Y**, **N** for the various implementation status.
+- **P** : When the implementation is incomplete for a few cases
+- **Y** : When the implementation is complete
+- **N** : When the implementation is absent
+
+Note 1 : No distinction is made between the support in the Parser/Semantics and MLIR or Lowering support.
+Note 2 : Besides the features listed below a few intrinsics like MIN/MAX are not supported for a few cases with CHARACTER type.
+
+## Fortran 77
+All features are supported.
+
+## Fortran 90
+All features are supported.
+
+## Fortran 95
+All features are supported.
+
+## Fortran 2003
+All features except those listed in the following table are supported.
+
+| Feature | Status | Comments |
+|------------------------------------------------------------|--------|---------------------------------------------------------|
+| Parameterized Derived Types | P | PDT with length type is not supported. See [Proposal](ParameterizedDerivedTypes.md) |
+| Assignment to allocatable | P | Assignment to whole allocatable in FORALL is not implemented |
+| Pointer Assignment | P | Polymorphic assignment in FORALL is not implemented |
+| The VOLATILE attribute | P | Volatile in procedure interfaces is not implemented |
+| Asynchronous input/output | P | IO will happen synchronously |
+
+## 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 [Proposal](InternalProcedureTrampolines.md) |
+
+## Fortran 2018
+TBD
+
+## Fortran 2023
+TBD
diff --git a/flang/docs/index.md b/flang/docs/index.md
index 1de0ee2e6f0d6..0c92ea9cf7633 100644
--- a/flang/docs/index.md
+++ b/flang/docs/index.md
@@ -26,6 +26,7 @@ on how to get in touch with us and to learn more about the current status.
C++style
DesignGuideline
FortranForCProgrammers
+ FortranStandardsSupport
GettingInvolved
GettingStarted
ImplementingASemanticCheck
>From 8499992cc802c3f5a20b4ead7b401d0fa3f10613 Mon Sep 17 00:00:00 2001
From: Kiran Chandramohan <kiran.chandramohan at arm.com>
Date: Fri, 21 Mar 2025 12:45:35 +0000
Subject: [PATCH 02/11] Address review comments
---
flang/docs/FortranStandardsSupport.md | 57 +++++++++++++--------------
1 file changed, 28 insertions(+), 29 deletions(-)
diff --git a/flang/docs/FortranStandardsSupport.md b/flang/docs/FortranStandardsSupport.md
index 5261633edc578..5c960c8680686 100644
--- a/flang/docs/FortranStandardsSupport.md
+++ b/flang/docs/FortranStandardsSupport.md
@@ -1,12 +1,12 @@
-<!--===- docs/FortranStandardsSupport.md
-
+<!--===- 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's Fortran standards support
+# Flang Fortran Standards Support
```{contents}
---
@@ -14,12 +14,12 @@ local:
---
```
-This document summarizes Flang's Fortran standards support. The information is only provided as a guideline. The compiler emits
-TODOs/Not Yet Implemented messages for unimplemented features and that should be treated as the authoratative information.
-Standards support is provided upto Fortran 2008 for now. It will be later extended for Fortran 2018 and Fortran 2023.
+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.
+Standards support is provided upto Fortran 2008 for now. It will be extended later for Fortran 2018 and Fortran 2023.
The standards support information is provided as a table with three columns that are self explanatory. The Status column uses
-the letters **P**, **Y**, **N** for the various implementation status.
+the letters **P**, **Y**, **N** for the implementation status:
- **P** : When the implementation is incomplete for a few cases
- **Y** : When the implementation is complete
- **N** : When the implementation is absent
@@ -27,37 +27,36 @@ the letters **P**, **Y**, **N** for the various implementation status.
Note 1 : No distinction is made between the support in the Parser/Semantics and MLIR or Lowering support.
Note 2 : Besides the features listed below a few intrinsics like MIN/MAX are not supported for a few cases with CHARACTER type.
-## Fortran 77
-All features are supported.
-
-## Fortran 90
-All features are supported.
+## Fortran 2023
+TBD
-## Fortran 95
-All features are supported.
+## Fortran 2018
+TBD
-## Fortran 2003
+## Fortran 2008
All features except those listed in the following table are supported.
| Feature | Status | Comments |
|------------------------------------------------------------|--------|---------------------------------------------------------|
-| Parameterized Derived Types | P | PDT with length type is not supported. See [Proposal](ParameterizedDerivedTypes.md) |
-| Assignment to allocatable | P | Assignment to whole allocatable in FORALL is not implemented |
-| Pointer Assignment | P | Polymorphic assignment in FORALL is not implemented |
-| The VOLATILE attribute | P | Volatile in procedure interfaces is not implemented |
-| Asynchronous input/output | P | IO will happen synchronously |
+| 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 [Proposal](InternalProcedureTrampolines.md) |
-## Fortran 2008
+## Fortran 2003
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 [Proposal](InternalProcedureTrampolines.md) |
+| 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 |
+| The VOLATILE attribute | P | VOLATILE in procedure interfaces is not implemented |
+| Asynchronous input/output | P | IO will happen synchronously |
-## Fortran 2018
-TBD
+## FORTRAN 77
+All features are supported.
-## Fortran 2023
-TBD
+## Fortran 90
+All features are supported.
+
+## Fortran 95
+All features are supported.
>From 6c4b380e9737f757c469b6d0881083bdc742a306 Mon Sep 17 00:00:00 2001
From: Kiran Chandramohan <kiran.chandramohan at arm.com>
Date: Sun, 23 Mar 2025 02:39:21 +0000
Subject: [PATCH 03/11] Add support tables for Fortran 2023 and Fortran 2018
standards
---
flang/docs/FortranStandardsSupport.md | 62 +++++++++++++++++++++++++--
1 file changed, 58 insertions(+), 4 deletions(-)
diff --git a/flang/docs/FortranStandardsSupport.md b/flang/docs/FortranStandardsSupport.md
index 5c960c8680686..9dbc3096f42de 100644
--- a/flang/docs/FortranStandardsSupport.md
+++ b/flang/docs/FortranStandardsSupport.md
@@ -28,10 +28,64 @@ Note 1 : No distinction is made between the support in the Parser/Semantics and
Note 2 : Besides the features listed below a few intrinsics like MIN/MAX are not supported for a few cases with CHARACTER type.
## Fortran 2023
-TBD
+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.
+
+| 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 | N | |
+| 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 | N | |
+| Intrinsics for Trig functions that work in degrees | N | |
+| Intrinsics for Trig functions that work in half revolutions| N | |
+| 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 | N | |
+| Procedures for converting between fortran and c strings | N | |
+| The at edit descriptor | N | |
+| Control over leading zeros in output of real values | N | |
+| 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 | N | |
+| Reduction specifier for do concurrent | Y | |
+| Enumerations | N | |
## Fortran 2018
-TBD
+All features except those listed in the following table are supported. Almost all of the unsupported features are related to
+coarrays.
+
+| Feature | Status | Comments |
+|------------------------------------------------------------|--------|---------------------------------------------------------|
+| Asynchronous communication | P | Syntax is accepted |
+| Teams | N | |
+| Image failure | P | stat_failed_image is added |
+| Form team statement | N | |
+| Change team construct | N | |
+| Coarrays allocated in teams | N | |
+| Critical construct | N | |
+| Lock and unlock statements | N | |
+| Events | N | |
+| Sync team construct | N | |
+| Image selectors | N | |
+| Intrinsic functions get_team and team_number | N | |
+| Intrinsic function image_index | N | |
+| Intrinsic function num_images | N | |
+| Intrinsic function this_image | N | |
+| Intrinsic move_alloc extensions | P | |
+| Detecting failed and stopped images | N | |
+| Collective subroutines | N | |
+| New and enhanced atomic subroutines | N | |
+| Failed images and stat= specifiers | N | |
+| Intrinsic function coshape | N | |
## Fortran 2008
All features except those listed in the following table are supported.
@@ -52,11 +106,11 @@ All features except those listed in the following table are supported.
| The VOLATILE attribute | P | VOLATILE in procedure interfaces is not implemented |
| Asynchronous input/output | P | IO will happen synchronously |
-## FORTRAN 77
+## Fortran 95
All features are supported.
## Fortran 90
All features are supported.
-## Fortran 95
+## FORTRAN 77
All features are supported.
>From 84165a73fb4f68f6234525cddbf26ad4e0539829 Mon Sep 17 00:00:00 2001
From: Kiran Chandramohan <kiran.chandramohan at arm.com>
Date: Sun, 23 Mar 2025 10:33:48 +0000
Subject: [PATCH 04/11] Move MIN MAX extension to Fortran 2003 table
---
flang/docs/FortranStandardsSupport.md | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/flang/docs/FortranStandardsSupport.md b/flang/docs/FortranStandardsSupport.md
index 9dbc3096f42de..df30f4b7ae493 100644
--- a/flang/docs/FortranStandardsSupport.md
+++ b/flang/docs/FortranStandardsSupport.md
@@ -24,8 +24,7 @@ the letters **P**, **Y**, **N** for the implementation status:
- **Y** : When the implementation is complete
- **N** : When the implementation is absent
-Note 1 : No distinction is made between the support in the Parser/Semantics and MLIR or Lowering support.
-Note 2 : Besides the features listed below a few intrinsics like MIN/MAX are not supported for a few cases with CHARACTER type.
+Note : No distinction is made between the support in the Parser/Semantics and MLIR or Lowering support.
## Fortran 2023
See [document](F202X.md) for a brief discussion about the new features in Fortran 2023. The following table summarizes the
@@ -105,6 +104,7 @@ All features except those listed in the following table are supported.
| Assignment to allocatable | P | Assignment to whole allocatable in FORALL is not implemented |
| The VOLATILE attribute | P | VOLATILE in procedure interfaces 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.
>From 8f9db848117821cbdda0e4138cce5d7ed2da9a03 Mon Sep 17 00:00:00 2001
From: Kiran Chandramohan <kiran.chandramohan at arm.com>
Date: Mon, 24 Mar 2025 10:51:39 +0000
Subject: [PATCH 05/11] Remove line about extending support for Fortran 2018
and Fortran 2023
---
flang/docs/FortranStandardsSupport.md | 1 -
1 file changed, 1 deletion(-)
diff --git a/flang/docs/FortranStandardsSupport.md b/flang/docs/FortranStandardsSupport.md
index df30f4b7ae493..dae7ec5482949 100644
--- a/flang/docs/FortranStandardsSupport.md
+++ b/flang/docs/FortranStandardsSupport.md
@@ -16,7 +16,6 @@ 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.
-Standards support is provided upto Fortran 2008 for now. It will be extended later for Fortran 2018 and Fortran 2023.
The standards support information is provided as a table with three columns that are self explanatory. The Status column uses
the letters **P**, **Y**, **N** for the implementation status:
>From 8eb16e412fc402eafe2e84630137d7f27b061de4 Mon Sep 17 00:00:00 2001
From: Kiran Chandramohan <kiran.chandramohan at arm.com>
Date: Mon, 24 Mar 2025 15:53:33 +0000
Subject: [PATCH 06/11] Address review comments
---
flang/docs/FortranStandardsSupport.md | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/flang/docs/FortranStandardsSupport.md b/flang/docs/FortranStandardsSupport.md
index dae7ec5482949..324ebaca4e2d0 100644
--- a/flang/docs/FortranStandardsSupport.md
+++ b/flang/docs/FortranStandardsSupport.md
@@ -54,12 +54,12 @@ status of all important Fortran 2023 features.
| 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 | N | |
-| Reduction specifier for do concurrent | 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
-coarrays.
+the additional parallel features (coarrays/teams/collectives).
| Feature | Status | Comments |
|------------------------------------------------------------|--------|---------------------------------------------------------|
>From 6781534ca5bb4be7b8cf27ed8318f6bfdd0023b9 Mon Sep 17 00:00:00 2001
From: Kiran Chandramohan <kiran.chandramohan at arm.com>
Date: Mon, 24 Mar 2025 23:50:49 +0000
Subject: [PATCH 07/11] Address review comment about multi-image execution
---
flang/docs/FortranStandardsSupport.md | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/flang/docs/FortranStandardsSupport.md b/flang/docs/FortranStandardsSupport.md
index 324ebaca4e2d0..65dc507398688 100644
--- a/flang/docs/FortranStandardsSupport.md
+++ b/flang/docs/FortranStandardsSupport.md
@@ -59,7 +59,7 @@ status of all important Fortran 2023 features.
## Fortran 2018
All features except those listed in the following table are supported. Almost all of the unsupported features are related to
-the additional parallel features (coarrays/teams/collectives).
+the multi-image execution.
| Feature | Status | Comments |
|------------------------------------------------------------|--------|---------------------------------------------------------|
>From 66199ad7e5b32b3b979ed8dd1261dcaaaf5c49db Mon Sep 17 00:00:00 2001
From: Kiran Chandramohan <kiran.chandramohan at arm.com>
Date: Sat, 19 Apr 2025 11:32:05 +0100
Subject: [PATCH 08/11] Partially address comments from Mark
---
flang/docs/FortranStandardsSupport.md | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/flang/docs/FortranStandardsSupport.md b/flang/docs/FortranStandardsSupport.md
index 65dc507398688..08e8a6e021321 100644
--- a/flang/docs/FortranStandardsSupport.md
+++ b/flang/docs/FortranStandardsSupport.md
@@ -27,7 +27,7 @@ Note : No distinction is made between the support in the Parser/Semantics and ML
## 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.
+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 |
|------------------------------------------------------------|--------|---------------------------------------------------------|
@@ -59,7 +59,7 @@ status of all important Fortran 2023 features.
## 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 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 |
|------------------------------------------------------------|--------|---------------------------------------------------------|
>From 04fb498eaca2ff00688906ae5264d81704fe84f9 Mon Sep 17 00:00:00 2001
From: Kiran Chandramohan <kiran.chandramohan at arm.com>
Date: Sun, 20 Apr 2025 17:39:32 +0100
Subject: [PATCH 09/11] Address Steve's comments
---
flang/docs/FortranStandardsSupport.md | 48 +++++++++++++++------------
1 file changed, 26 insertions(+), 22 deletions(-)
diff --git a/flang/docs/FortranStandardsSupport.md b/flang/docs/FortranStandardsSupport.md
index 08e8a6e021321..c913edc7a5eec 100644
--- a/flang/docs/FortranStandardsSupport.md
+++ b/flang/docs/FortranStandardsSupport.md
@@ -17,13 +17,17 @@ 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 standards support information is provided as a table with three columns that are self explanatory. No distinction is
+made between the support in the Parser/Semantics and MLIR or Lowering support. The Status column uses
the letters **P**, **Y**, **N** for the implementation status:
- **P** : When the implementation is incomplete for a few cases
- **Y** : When the implementation is complete
- **N** : When the implementation is absent
-Note : No distinction is made between the support in the Parser/Semantics and MLIR or Lowering support.
+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
@@ -64,26 +68,26 @@ the multi-image execution. The table entries are based on the document [The new
| Feature | Status | Comments |
|------------------------------------------------------------|--------|---------------------------------------------------------|
| Asynchronous communication | P | Syntax is accepted |
-| Teams | N | |
-| Image failure | P | stat_failed_image is added |
-| Form team statement | N | |
-| Change team construct | N | |
-| Coarrays allocated in teams | N | |
-| Critical construct | N | |
-| Lock and unlock statements | N | |
-| Events | N | |
-| Sync team construct | N | |
-| Image selectors | N | |
-| Intrinsic functions get_team and team_number | N | |
-| Intrinsic function image_index | N | |
-| Intrinsic function num_images | N | |
-| Intrinsic function this_image | N | |
-| Intrinsic move_alloc extensions | P | |
-| Detecting failed and stopped images | N | |
-| Collective subroutines | N | |
-| New and enhanced atomic subroutines | N | |
-| Failed images and stat= specifiers | N | |
-| Intrinsic function coshape | N | |
+| Teams | N | Multi-image/Coarray feature |
+| Image failure | P | Multi-image/Coarray feature. stat_failed_image is added |
+| Form team statement | N | Multi-image/Coarray feature |
+| Change team construct | N | Multi-image/Coarray feature |
+| 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 |
+| Sync team construct | N | Multi-image/Coarray feature |
+| Image selectors | N | Multi-image/Coarray feature |
+| Intrinsic functions get_team and team_number | N | Multi-image/Coarray feature |
+| Intrinsic function image_index | N | Multi-image/Coarray feature |
+| Intrinsic function num_images | N | Multi-image/Coarray feature |
+| Intrinsic function this_image | N | Multi-image/Coarray feature |
+| Intrinsic move_alloc extensions | P | Multi-image/Coarray feature |
+| Detecting failed and stopped images | N | Multi-image/Coarray feature |
+| Collective subroutines | N | Multi-image/Coarray feature |
+| New and enhanced atomic subroutines | N | Multi-image/Coarray feature |
+| Failed images and stat= specifiers | 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.
>From 27260b6c05b46aee7a3086dba60ba93def034af9 Mon Sep 17 00:00:00 2001
From: Kiran Chandramohan <kiran.chandramohan at arm.com>
Date: Mon, 21 Apr 2025 08:58:56 +0100
Subject: [PATCH 10/11] Remove duplicate sentence
---
flang/docs/FortranStandardsSupport.md | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/flang/docs/FortranStandardsSupport.md b/flang/docs/FortranStandardsSupport.md
index c913edc7a5eec..e16863cf2cce4 100644
--- a/flang/docs/FortranStandardsSupport.md
+++ b/flang/docs/FortranStandardsSupport.md
@@ -17,9 +17,8 @@ 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. No distinction is
-made between the support in the Parser/Semantics and MLIR or Lowering support. The Status column uses
-the letters **P**, **Y**, **N** for the implementation status:
+The standards support information is provided as a table with three columns that are self explanatory.
+The Status column uses the letters **P**, **Y**, **N** for the implementation status:
- **P** : When the implementation is incomplete for a few cases
- **Y** : When the implementation is complete
- **N** : When the implementation is absent
>From c36aebcef2d187aba61f8a5606b8e22555b01239 Mon Sep 17 00:00:00 2001
From: Kiran Chandramohan <kiran.chandramohan at arm.com>
Date: Tue, 22 Apr 2025 22:06:15 +0100
Subject: [PATCH 11/11] Address comment from h.vetinari
---
flang/docs/FortranStandardsSupport.md | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/flang/docs/FortranStandardsSupport.md b/flang/docs/FortranStandardsSupport.md
index e16863cf2cce4..78f5aa4f5dd8d 100644
--- a/flang/docs/FortranStandardsSupport.md
+++ b/flang/docs/FortranStandardsSupport.md
@@ -18,10 +18,10 @@ This document summarizes Fortran standards support in Flang. The information is
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 **P**, **Y**, **N** for the implementation status:
-- **P** : When the implementation is incomplete for a few cases
-- **Y** : When the implementation is complete
-- **N** : When the implementation is absent
+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.
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