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Re: [PATCH] define WIDEST_HARDWARE_FP_SIZE on mips
On Wed, 4 Mar 2009, Geert Bosch wrote:
> Yes, a-numaux has to go. Still, a problem when interfacing to a C math
> library is that there is no widely recognized way to identify functions for
> different types. For example, IA-64 supports 32, 64 and 80-bit float types
> in hardware. There also is some support for emulating 128-bit float types.
> What functions am I going to call to get accurate implementations of the
> sine function for all 4 floating-point types?
C90 defines the functions for double; C99 adds functions for float and
long double (whose names were reserved in C90, but the functions weren't
required) and a lot more functions for all the types. So for types
matching FLOAT_TYPE_SIZE, DOUBLE_TYPE_SIZE or LONG_DOUBLE_TYPE_SIZE you
know what functions to use (subject to per-multilib autoconf checks for
availability of the C99 functions, as used by libgfortran and libstdc++);
it's only types that aren't standard C types (such as __float128) for
which the functions may not be available and don't have standard names.
--
Joseph S. Myers
joseph@codesourcery.com