On Wed, Feb 25, 2009 at 4:43 PM, Florent DEFAY <spira.inhabit...@gmail.com> wrote: > Hi, > > I would like to know more about REAL_MODE_FORMAT and real_format_for_mode. > > I'm sorry because I already posted this email in gcc-help mailing-list > but there was no answer and maybe its right place is here ? > > I am working on a port of GCC. The new xgcc generated crashes this way : > > Program received signal SIGSEGV, Segmentation fault. > builtin_define_float_constants (name_prefix=0x83fcaf9 "FLT", > fp_suffix=0x8419523 "F", fp_cast=0x84109dd "%s", type=0xb7c0a410) at > ../../gcc-4.3.3/gcc/c-cppbuiltin.c:108 > 108 gcc_assert (fmt->b != 10); > > because fmt = 0. > > This fmt results of > fmt = REAL_MODE_FORMAT (TYPE_MODE (type)); > > and REAL_MODE_FORMAT is defined this way : > > #define REAL_MODE_FORMAT(MODE) \ > (real_format_for_mode[DECIMAL_FLOAT_MODE_P (MODE) \ > ? ((MODE - MIN_MODE_DECIMAL_FLOAT) \ > + (MAX_MODE_FLOAT - MIN_MODE_FLOAT + 1)) \ > : (MODE - MIN_MODE_FLOAT)]) > > But I did not find definition for real_format_for_mode, just an > "extern" in real.h (nothing in real.c) : > > extern const struct real_format * > real_format_for_mode[MAX_MODE_FLOAT - MIN_MODE_FLOAT + 1 > + MAX_MODE_DECIMAL_FLOAT - MIN_MODE_DECIMAL_FLOAT + 1]; > > > Should I include an implementation of real_format_for_mode in my > target.c ? If I should, how can I do that ? If not, how to avoid this > crash ? Any idea ?
It is in the generated file insn-modes.c generated by genmodes.c from machmode.def. Richard. > Thank you. > > Florent >
