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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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Welcome to Flang's documentation
Flang is LLVM's Fortran frontend that can be found here. It is often referred to as "LLVM Flang" to differentiate itself from "Classic Flang" - these are two separate and independent Fortran compilers. LLVM Flang is under active development. While it is capable of generating executables for a number of examples, some functionality is still missing. See Getting Involved for tips on how to get in touch with us and to learn more about the current status.
.. toctree::
:titlesonly:
ReleaseNotes
Contributing to Flang
.. toctree::
:titlesonly:
C++17
C++style
DesignGuideline
FortranForCProgrammers
GettingInvolved
GettingStarted
ImplementingASemanticCheck
PullRequestChecklist
Design Documents
.. toctree::
:titlesonly:
Aliasing
AliasingAnalysisFIR
ArrayComposition
AssumedRank
BijectiveInternalNameUniquing
Calls
Character
ComplexOperations
ControlFlowGraph
DebugGeneration
Directives
DoConcurrent
Extensions
F202X
FIRArrayOperations
FIRLangRef
FlangCommandLineReference
FlangDriver
FortranFeatureHistory
FortranIR
FortranLLVMTestSuite
HighLevelFIR
IORuntimeInternals
InternalProcedureTrampolines
Intrinsics
IntrinsicTypes
LabelResolution
ModFiles
OpenACC
OpenACC-descriptor-management.md
OpenMP-4.5-grammar.md
OpenMP-declare-target
OpenMP-descriptor-management
OpenMP-semantics
OptionComparison
Overview
ParameterizedDerivedTypes
ParserCombinators
Parsing
PolymorphicEntities
Preprocessing
ProcedurePointer
RuntimeDescriptor
RuntimeEnvironment
RuntimeTypeInfo
Semantics
f2018-grammar.md
fstack-arrays
Real16MathSupport
Unsigned
Indices and tables
* :ref:`genindex`
* :ref:`search`