[all-commits] [llvm/llvm-project] d9c4c3: [CLANG] Full support of complex multiplication and...
Zahira Ammarguellat via All-commits
all-commits at lists.llvm.org
Wed Mar 20 12:14:31 PDT 2024
Branch: refs/heads/main
Home: https://github.com/llvm/llvm-project
Commit: d9c4c312d81b4a2059d0ca2bb454c3452e52042e
https://github.com/llvm/llvm-project/commit/d9c4c312d81b4a2059d0ca2bb454c3452e52042e
Author: Zahira Ammarguellat <zahira.ammarguellat at intel.com>
Date: 2024-03-20 (Wed, 20 Mar 2024)
Changed paths:
M clang/docs/UsersManual.rst
M clang/include/clang/Basic/DiagnosticCommonKinds.td
M clang/include/clang/Basic/LangOptions.h
M clang/include/clang/Driver/Options.td
M clang/lib/CodeGen/CGExprComplex.cpp
M clang/lib/Driver/ToolChains/Clang.cpp
M clang/lib/Parse/ParsePragma.cpp
A clang/test/CodeGen/X86/cx-complex-range.c
M clang/test/CodeGen/complex-math.c
M clang/test/CodeGen/cx-complex-range.c
M clang/test/CodeGen/pragma-cx-limited-range.c
M clang/test/CodeGen/smiths-complex-div.c
M clang/test/Driver/range.c
Log Message:
-----------
[CLANG] Full support of complex multiplication and division. (#81514)
In clang there are two options `-f[no]cx-limited-range` and
`-f[no]cx-fortran-rules` that control the range of complex
multiplication and division. However, it is unclear how these options
interact with one another. For instance, what should happen when the
users compile with `-fcx-fortran-rules -fno-cx-limited-range` or
`-fcx-limited-range -fno-cx-fortran-rules`?
In this patch we are introducing a new option to solve the issue and
give a greater flexibility to the user to control the behavior of the
compiler when performing multiplication and division of complex
floating-point values.
`-fcomplex-arihmetic=[full|improved|promoted|basic]`
`full`: Implementation of complex division and multiplication using a
call to runtime library functions (generally the case, but the BE might
sometimes replace the library call if it knows enough about the
potential range of the inputs). Overflow and non-finite values are
handled by the library implementation. For the case of multiplication
overflow will occur in accordance with normal floating-point rules. This
is the default value.
`improved`: Implementation of complex division using the Smith algorithm
at source precision. Smith's algorithm for complex division. See SMITH,
R. L. Algorithm 116: Complex division. Commun. ACM 5, 8 (1962). This
value offers improved handling for overflow in intermediate
calculations, but overflow may occur. NaN and infinite values are not
handled in some cases.
`promoted`: Implementation of complex division using algebraic formulas
at higher precision. Overflow is handled. Non-finite values are handled
in some cases. If the target does not have native support for a higher
precision data type, the implementation for the complex operation using
the Smith algorithm will be used. Overflow may still occur in some
cases. NaN and infinite values are not handled.
`basic`: Implementation of complex division and multiplication using
algebraic formulas at source precision. No special handling to avoid
overflow. NaN and infinite values are not handled.
`fcx-limited-range` will alias `-fcomplex-arithmetic=basic`
`-fcx-fortran-rules` will alias `-fcomplex-arithmetic=improved`
`-fno-cx-limited-range` and `-fno-cx-fortran-rules` will alias
`-fcomplex-arithmetic=full`
The complex division and multiplication will be implemented as follows
depending on the option used.
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<!--StartFragment-->
-fcomplex-arithmetic | div | mul
-- | -- | --
basic | algebraic form | algebraic form
improved | smith's algorithm | algebraic form
full | libcall | libcall + nan processing
promoted | algebraic form + higher precision | algebraic form
<!--EndFragment-->
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