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NimishMishra 7aed77ef95 [flang][OpenMP] Add implicit casts for omp.atomic.capture (#138163 )

This patch adds support for emitting implicit casts for atomic capture
if its constituent operations have different yet compatible types.

Fixes: https://github.com/llvm/llvm-project/issues/138123 and
https://github.com/llvm/llvm-project/issues/94177

2025-05-09 09:25:21 -07:00

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Flang OpenMP Support

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This document outlines the OpenMP API features supported by Flang. It is intended as a general reference. For the most accurate information on unimplemented features, rely on the compiler’s TODO or “Not Yet Implemented” messages, which are considered authoritative. Flang provides complete implementation of the OpenMP 3.1 specification and partial implementation of OpenMP 4.0, with continued development efforts aimed at extending full support for the latter. The table below outlines the current status of OpenMP 4.0 feature support. Work is ongoing to add support for OpenMP 4.5 and newer versions; a support statement for these will be shared in the future. The table entries are derived from the information provided in the Version Differences subsection of the Features History section in the OpenMP standard.

The feature 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 : Partial. When the implementation is incomplete for a few cases
Y : Yes. When the implementation is complete
N : No. When the implementation is absent

Note : No distinction is made between the support in Parser/Semantics, MLIR, Lowering or the OpenMPIRBuilder.

OpenMP 4.0

Feature	Status	Comments
proc_bind clause	Y
simd construct	P	linear clause is not supported
declare simd construct	N
do simd construct	P	linear clause is not supported
target data construct	P	device clause not supported
target construct	P	device clause not supported
target update construct	P	device clause not supported
declare target directive	P
teams construct	P	reduction clause not supported
distribute construct	P	dist_schedule clause not supported
distribute simd construct	P	dist_schedule and linear clauses are not supported
distribute parallel loop construct	P	dist_schedule clause not supported
distribute parallel loop simd construct	P	dist_schedule and linear clauses are not supported
depend clause	Y
declare reduction construct	N
atomic construct extensions	Y
cancel construct	Y
cancellation point construct	Y
parallel do simd construct	P	linear clause is not supported
target teams construct	P	device and reduction clauses are not supported
teams distribute construct	P	reduction and dist_schedule clauses not supported
teams distribute simd construct	P	reduction, dist_schedule and linear clauses are not supported
target teams distribute construct	P	device, reduction and dist_schedule clauses are not supported
teams distribute parallel loop construct	P	reduction and dist_schedule clauses are not supported
target teams distribute parallel loop construct	P	device, reduction and dist_schedule clauses are not supported
teams distribute parallel loop simd construct	P	reduction, dist_schedule, and linear clauses are not supported
target teams distribute parallel loop simd construct	P	device, reduction, dist_schedule and linear clauses are not supported

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Flang OpenMP Support

OpenMP 4.0

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