On 17.05.22 12:09, Thomas König wrote:
be might complement to the QP support for POWER in gcc 12, and I have actually thought about doing. The library has its gotchas, though - I do not suppose we can count on fp16 support for trigonometrics and similar, for example,
I think that mostly depends on what the hardware supports and what has been implemented in the target code. For instance nvptx supports tanh and ex2 (ex2(a) := 2**a)) for .f16 – and nvidia.md also contains, e.g. '(define_insn "exp2hf2"' which operates on "HF". And there is also the following in gcc/builtins.def: DEF_C99_BUILTIN (BUILT_IN_ACOSHF, "acoshf", BT_FN_FLOAT_FLOAT, ATTR_MATHFN_FPROUNDING_ERRNO) DEF_C99_BUILTIN (BUILT_IN_ASINHF, "asinhf", BT_FN_FLOAT_FLOAT, ATTR_MATHFN_FPROUNDING) DEF_C99_BUILTIN (BUILT_IN_ATANHF, "atanhf", BT_FN_FLOAT_FLOAT, ATTR_MATHFN_FPROUNDING_ERRNO) DEF_C99_C90RES_BUILTIN (BUILT_IN_COSHF, "coshf", BT_FN_FLOAT_FLOAT, ATTR_MATHFN_FPROUNDING_ERRNO) DEF_C99_C90RES_BUILTIN (BUILT_IN_SINHF, "sinhf", BT_FN_FLOAT_FLOAT, ATTR_MATHFN_FPROUNDING_ERRNO) DEF_C99_C90RES_BUILTIN (BUILT_IN_TANHF, "tanhf", BT_FN_FLOAT_FLOAT, ATTR_MATHFN_FPROUNDING) DEF_C99_COMPL_BUILTIN (BUILT_IN_CACOSHF, "cacoshf", BT_FN_COMPLEX_FLOAT_COMPLEX_FLOAT, ATTR_MATHFN_FPROUNDING) DEF_C99_COMPL_BUILTIN (BUILT_IN_CASINHF, "casinhf", BT_FN_COMPLEX_FLOAT_COMPLEX_FLOAT, ATTR_MATHFN_FPROUNDING) DEF_C99_COMPL_BUILTIN (BUILT_IN_CATANHF, "catanhf", BT_FN_COMPLEX_FLOAT_COMPLEX_FLOAT, ATTR_MATHFN_FPROUNDING) DEF_C99_COMPL_BUILTIN (BUILT_IN_CCOSHF, "ccoshf", BT_FN_COMPLEX_FLOAT_COMPLEX_FLOAT, ATTR_MATHFN_FPROUNDING) DEF_C99_COMPL_BUILTIN (BUILT_IN_CSINHF, "csinhf", BT_FN_COMPLEX_FLOAT_COMPLEX_FLOAT, ATTR_MATHFN_FPROUNDING) DEF_C99_COMPL_BUILTIN (BUILT_IN_CTANHF, "ctanhf", BT_FN_COMPLEX_FLOAT_COMPLEX_FLOAT, ATTR_MATHFN_FPROUNDING) But as said: the basic support for HF-supporting target should be simple, supporting all the library is more difficult. But the question is whether full support is needed or not. For 'acoshf' - if it is not available but used, it is mostly a user problem - which can be fixed by a suitable libm. I assume that on systems where HF is relevant, libm can be compiled such that it works. And in the compiler, you can use '#ifdef HAVE_HFmode' to check whether it exists. Tobias ----------------- Siemens Electronic Design Automation GmbH; Anschrift: Arnulfstraße 201, 80634 München; Gesellschaft mit beschränkter Haftung; Geschäftsführer: Thomas Heurung, Frank Thürauf; Sitz der Gesellschaft: München; Registergericht München, HRB 106955
