[Bug libfortran/38199] missed optimization: I/O performance

["jb at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38199

--- Comment #15 from Janne Blomqvist <jb at gcc dot gnu.org> 2012-03-15 15:14:51 UTC ---
Author: jb
Date: Thu Mar 15 15:14:43 2012
New Revision: 185433

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=185433
Log:
2012-03-15  Janne Blomqvist  <jb@gcc.gnu.org>

        PR libfortran/52434
        PR libfortran/48878
        PR libfortran/38199
        * io/unit.c (get_internal_unit): Default to ROUND_UNSPECIFIED.
        (init_units): Likewise.
        * io/write_float.def (determine_precision): New function.
        (output_float): Take into account buffer with %f format, no need
        for our own rounding if unspecified or processor specified
        rounding.
        (DTOA): Simplify format string, add parameters.
        (FDTOA): New macros similar to DTOA, but using %f format.
        (OUTPUT_FLOAT_FMT_G): Stack allocate newf, determine correct
        precision and fill buffer.
        (EN_PREC): New macro.
        (determine_en_precision): New function.
        (WRITE_FLOAT): For G format, move buffer filling into
        output_float_FMT_G, use FDTOA for F format.
        (write_float): Increase buffer due to F format.

testsuite ChangeLog:

2012-03-15  Janne Blomqvist  <jb@gcc.gnu.org>

        PR libfortran/52434
        PR libfortran/48878
        PR libfortran/38199
        * gfortran.dg/edit_real_1.f90: Don't assume roundTiesToAway.
        * gfortran.dg/round_1.f03: Likewise.


Modified:
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gfortran.dg/edit_real_1.f90
    trunk/gcc/testsuite/gfortran.dg/round_1.f03
    trunk/libgfortran/ChangeLog
    trunk/libgfortran/io/unit.c
    trunk/libgfortran/io/write_float.def