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gfortran.h: Add bitmasks for different FPE traps.

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* gfortran.h: Add bitmasks for different FPE traps. Add fpe
	member to options_t.
	* invoke.texi: Document the new -ffpe-trap option.
	* lang.opt: Add -ffpe-trap option.
	* options.c (gfc_init_options): Initialize the FPE option.
	(gfc_handle_fpe_trap_option): New function to parse the argument
	of the -ffpe-trap option.
	(gfc_handle_option): Add case for -ffpe-trap.
	* trans-decl.c: Declare a tree for the set_fpe library function.
	(gfc_build_builtin_function_decls): Build this tree.
	(gfc_generate_function_code): Generate a call to set_fpe at
	the beginning of the main program.
	* trans.h: New tree for the set_fpe library function.

	* Makefile.am: Add fpu.c to the build process, and
	target-dependent code as fpu-target.h.
	* Makefile.in: Regenerate.
	* configure.ac: Add call to configure.host to set
	FPU_HOST_HEADER.
	* configure: Regenerate.
	* config.h.in: Regenerate.
	* aclocal.m4: Regenerate.
	* configure.host: New script to determine which host-dependent
	code should go in.
	* libgfortran.h: Add fpe option, remove previous fpu_ options.
	Add bitmasks for different FPE traps. Add prototype for set_fpu.
	* runtime/environ.c: Remove environment variables to control
	fpu behaviour.
	* runtime/fpu.c (set_fpe): New function for the front-end.
	* runtime/main.c (init): Set FPU state.
	* config: New directory to store host-dependent code.
	* config/fpu-387.h: New file with code handling the i387 FPU.
	* config/fpu-glibc.h: New file with code for glibc systems.
	* config/fpu-generic.h: Fallback for the most generic host. Issue
	warnings.

From-SVN: r105328
This commit is contained in:
François-Xavier Coudert 2005-10-12 20:21:31 +00:00
parent f23a977ce5
commit 944b8b35a9
21 changed files with 575 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
gcc/fortran/ChangeLog
View File

@ -1,3 +1,19 @@
2005-10-12 Francois-Xavier Coudert <coudert@clipper.ens.fr>
* gfortran.h: Add bitmasks for different FPE traps. Add fpe
member to options_t.
* invoke.texi: Document the new -ffpe-trap option.
* lang.opt: Add -ffpe-trap option.
* options.c (gfc_init_options): Initialize the FPE option.
(gfc_handle_fpe_trap_option): New function to parse the argument
of the -ffpe-trap option.
(gfc_handle_option): Add case for -ffpe-trap.
* trans-decl.c: Declare a tree for the set_fpe library function.
(gfc_build_builtin_function_decls): Build this tree.
(gfc_generate_function_code): Generate a call to set_fpe at
the beginning of the main program.
* trans.h: New tree for the set_fpe library function.
2005-10-12 Paul Thomas <pault@gcc.gnu.org>
PR fortran/20847
@ -34,7 +50,7 @@
2005-10-07 Erik Edelmann <erik.edelmann@iki.fi>
PR 18568
PR 18568
* resolve.c (find_array_spec): Search through the list of
components in the symbol of the type instead of the symbol of the
variable.

11
gcc/fortran/gfortran.h
View File

@ -103,6 +103,15 @@ mstring;
#define GFC_STD_F95_OBS (1<<1) /* Obsoleted in F95. */
#define GFC_STD_F77 (1<<0) /* Up to and including F77. */
/* Bitmasks for the various FPE that can be enabled. */
#define GFC_FPE_INVALID (1<<0)
#define GFC_FPE_DENORMAL (1<<1)
#define GFC_FPE_ZERO (1<<2)
#define GFC_FPE_OVERFLOW (1<<3)
#define GFC_FPE_UNDERFLOW (1<<4)
#define GFC_FPE_PRECISION (1<<5)
/*************************** Enums *****************************/
/* The author remains confused to this day about the convention of
@ -1453,6 +1462,8 @@ typedef struct
int q_kind;
int fpe;
int warn_std;
int allow_std;
int warn_nonstd_intrinsics;

18
gcc/fortran/invoke.texi
View File

@ -133,7 +133,7 @@ by type. Explanations are in the following sections.
@item Debugging Options
@xref{Debugging Options,,Options for Debugging Your Program or GCC}.
@gccoptlist{
-fdump-parse-tree}
-fdump-parse-tree -ffpe-trap=@var{list}}
@item Directory Options
@xref{Directory Options,,Options for Directory Search}.
@ -464,6 +464,22 @@ Output the internal parse tree before starting code generation. Only
really useful for debugging gfortran itself.
@end table
@table @gcctabopt
@cindex -ffpe-trap=@var{list} option
@cindex option, -ffpe-trap=@var{list}
@item -ffpe-trap=@var{list}
Specify a list of IEEE exceptions when a Floating Point Exception
(FPE) should be raised. On most systems, this will result in a SIGFPE
signal being sent and the program being interrupted, producing a core
file useful for debugging. @var{list} is a (possibly empty) comma-separated
list of the following IEEE exceptions: @samp{invalid} (invalid floating
point operation, such as @code{sqrt(-1.0)}), @samp{zero} (division by
zero), @samp{overflow} (overflow in a floating point operation),
@samp{underflow} (underflow in a floating point operation),
@samp{precision} (loss of precision during operation) and @samp{denormal}
(operation produced a denormal denormal value).
@end table
@xref{Debugging Options,,Options for Debugging Your Program or GCC,
gcc,Using the GNU Compiler Collection (GCC)}, for more information on
debugging options.

4
gcc/fortran/lang.opt
View File

@ -165,6 +165,10 @@ qkind=
Fortran RejectNegative Joined UInteger
-qkind=<n> Set the kind for a real with the 'q' exponent to 'n'
ffpe-trap=
Fortran RejectNegative JoinedOrMissing
-ffpe-trap=[..] Stop on following floating point exceptions
std=f95
Fortran
Conform to the ISO Fortran 95 standard

41
gcc/fortran/options.c
View File

@ -76,6 +76,8 @@ gfc_init_options (unsigned int argc ATTRIBUTE_UNUSED,
gfc_option.q_kind = gfc_default_double_kind;
gfc_option.fpe = 0;
flag_argument_noalias = 2;
flag_errno_math = 0;
@ -278,6 +280,41 @@ gfc_handle_module_path_options (const char *arg)
strcat (gfc_option.module_dir, "/");
}
static void
gfc_handle_fpe_trap_option (const char *arg)
{
int result, pos = 0, n;
static const char * const exception[] = { "invalid", "denormal", "zero",
"overflow", "underflow",
"precision", NULL };
static const int opt_exception[] = { GFC_FPE_INVALID, GFC_FPE_DENORMAL,
GFC_FPE_ZERO, GFC_FPE_OVERFLOW,
GFC_FPE_UNDERFLOW, GFC_FPE_PRECISION,
0 };
while (*arg)
{
while (*arg == ',')
arg++;
while (arg[pos] && arg[pos] != ',')
pos++;
result = 0;
for (n = 0; exception[n] != NULL; n++)
{
if (exception[n] && strncmp (exception[n], arg, pos) == 0)
{
gfc_option.fpe |= opt_exception[n];
arg += pos;
pos = 0;
result = 1;
break;
}
}
if (! result)
gfc_fatal_error ("Argument to -ffpe-trap is not valid: %s", arg);
}
}
/* Handle command-line options. Returns 0 if unrecognized, 1 if
recognized and handled. */
int
@ -440,6 +477,10 @@ gfc_handle_option (size_t scode, const char *arg, int value)
gfc_handle_module_path_options (arg);
break;
case OPT_ffpe_trap_:
gfc_handle_fpe_trap_option (arg);
break;
case OPT_std_f95:
gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95 | GFC_STD_F77;
gfc_option.warn_std = GFC_STD_F95_OBS;

21
gcc/fortran/trans-decl.c
View File

@ -85,6 +85,7 @@ tree gfor_fndecl_stop_numeric;
tree gfor_fndecl_stop_string;
tree gfor_fndecl_select_string;
tree gfor_fndecl_runtime_error;
tree gfor_fndecl_set_fpe;
tree gfor_fndecl_set_std;
tree gfor_fndecl_in_pack;
tree gfor_fndecl_in_unpack;
@ -1934,6 +1935,7 @@ gfc_build_intrinsic_function_decls (void)
void
gfc_build_builtin_function_decls (void)
{
tree gfc_c_int_type_node = gfc_get_int_type (gfc_c_int_kind);
tree gfc_int4_type_node = gfc_get_int_type (4);
tree gfc_int8_type_node = gfc_get_int_type (8);
tree gfc_logical4_type_node = gfc_get_logical_type (4);
@ -2018,6 +2020,10 @@ gfc_build_builtin_function_decls (void)
/* The runtime_error function does not return. */
TREE_THIS_VOLATILE (gfor_fndecl_runtime_error) = 1;
gfor_fndecl_set_fpe =
gfc_build_library_function_decl (get_identifier (PREFIX("set_fpe")),
void_type_node, 1, gfc_c_int_type_node);
gfor_fndecl_set_std =
gfc_build_library_function_decl (get_identifier (PREFIX("set_std")),
void_type_node,
@ -2455,6 +2461,21 @@ gfc_generate_function_code (gfc_namespace * ns)
gfc_add_expr_to_block (&body, tmp);
}
/* If this is the main program and a -ffpe-trap option was provided,
add a call to set_fpe so that the library will raise a FPE when
needed. */
if (sym->attr.is_main_program && gfc_option.fpe != 0)
{
tree arglist, gfc_c_int_type_node;
gfc_c_int_type_node = gfc_get_int_type (gfc_c_int_kind);
arglist = gfc_chainon_list (NULL_TREE,
build_int_cst (gfc_c_int_type_node,
gfc_option.fpe));
tmp = gfc_build_function_call (gfor_fndecl_set_fpe, arglist);
gfc_add_expr_to_block (&body, tmp);
}
if (TREE_TYPE (DECL_RESULT (fndecl)) != void_type_node
&& sym->attr.subroutine)
{

1
gcc/fortran/trans.h
View File

@ -455,6 +455,7 @@ extern GTY(()) tree gfor_fndecl_stop_numeric;
extern GTY(()) tree gfor_fndecl_stop_string;
extern GTY(()) tree gfor_fndecl_select_string;
extern GTY(()) tree gfor_fndecl_runtime_error;
extern GTY(()) tree gfor_fndecl_set_fpe;
extern GTY(()) tree gfor_fndecl_set_std;
extern GTY(()) tree gfor_fndecl_in_pack;
extern GTY(()) tree gfor_fndecl_in_unpack;

22
libgfortran/ChangeLog
View File

@ -1,3 +1,25 @@
2005-10-12 Francois-Xavier Coudert <coudert@clipper.ens.fr>
* Makefile.am: Add fpu.c to the build process, and
target-dependent code as fpu-target.h.
* Makefile.in: Regenerate.
* configure.ac: Add call to configure.host to set
FPU_HOST_HEADER.
* configure: Regenerate.
* configure.host: New script to determine which host-dependent
code should go in.
* libgfortran.h: Add fpe option, remove previous fpu_ options.
Add bitmasks for different FPE traps. Add prototype for set_fpu.
* runtime/environ.c: Remove environment variables to control
fpu behaviour.
* runtime/fpu.c (set_fpe): New function for the front-end.
* runtime/main.c (init): Set FPU state.
* config: New directory to store host-dependent code.
* config/fpu-387.h: New file with code handling the i387 FPU.
* config/fpu-glibc.h: New file with code for glibc systems.
* config/fpu-generic.h: Fallback for the most generic host. Issue
warnings.
2005-10-12 Janne Blomqvist <jblomqvi@cc.hut.fi>
* io/unix.c: Remove parts of patch of 2005/10/07 that cause

8
libgfortran/Makefile.am
View File

@ -18,8 +18,6 @@ libgfortranbegin_la_LDFLAGS = -static
## use -iquote
AM_CPPFLAGS = -iquote$(srcdir)/io
libgfortranincludedir = $(includedir)/gforio
gfor_io_src= \
io/close.c \
io/file_pos.c \
@ -97,6 +95,7 @@ gfor_src= \
runtime/compile_options.c \
runtime/environ.c \
runtime/error.c \
runtime/fpu.c \
runtime/main.c \
runtime/memory.c \
runtime/pause.c \
@ -433,7 +432,7 @@ gfor_built_src= $(i_all_c) $(i_any_c) $(i_count_c) $(i_maxloc0_c) \
$(i_exponent_c) $(i_fraction_c) $(i_nearest_c) $(i_set_exponent_c) \
$(i_pow_c) \
selected_int_kind.inc selected_real_kind.inc kinds.h \
kinds.inc c99_protos.inc
kinds.inc c99_protos.inc fpu-target.h
# Machine generated specifics
gfor_built_specific_src= \
@ -592,6 +591,9 @@ selected_int_kind.inc: $(srcdir)/mk-sik-inc.sh
selected_real_kind.inc: $(srcdir)/mk-srk-inc.sh
$(SHELL) $(srcdir)/mk-srk-inc.sh '$(FCCOMPILE)' > $@
fpu-target.h: $(srcdir)/$(FPU_HOST_HEADER)
cp $(srcdir)/$(FPU_HOST_HEADER) $@
## A 'normal' build shouldn't need to regenerate these
## so we only include them in maintainer mode

13
libgfortran/Makefile.in
View File

@ -66,7 +66,7 @@ am__installdirs = "$(DESTDIR)$(toolexeclibdir)"
toolexeclibLTLIBRARIES_INSTALL = $(INSTALL)
LTLIBRARIES = $(toolexeclib_LTLIBRARIES)
libgfortran_la_LIBADD =
am__objects_1 = compile_options.lo environ.lo error.lo main.lo \
am__objects_1 = compile_options.lo environ.lo error.lo fpu.lo main.lo \
memory.lo pause.lo stop.lo string.lo select.lo
am__objects_2 = all_l4.lo all_l8.lo all_l16.lo
am__objects_3 = any_l4.lo any_l8.lo any_l16.lo
@ -276,6 +276,7 @@ EGREP = @EGREP@
EXEEXT = @EXEEXT@
FC = @FC@
FCFLAGS = @FCFLAGS@
FPU_HOST_HEADER = @FPU_HOST_HEADER@
INSTALL_DATA = @INSTALL_DATA@
INSTALL_PROGRAM = @INSTALL_PROGRAM@
INSTALL_SCRIPT = @INSTALL_SCRIPT@
@ -357,7 +358,6 @@ libgfortran_la_LDFLAGS = -version-info `grep -v '^\#' $(srcdir)/libtool-version`
libgfortranbegin_la_SOURCES = fmain.c
libgfortranbegin_la_LDFLAGS = -static
AM_CPPFLAGS = -iquote$(srcdir)/io
libgfortranincludedir = $(includedir)/gforio
gfor_io_src = \
io/close.c \
io/file_pos.c \
@ -435,6 +435,7 @@ gfor_src = \
runtime/compile_options.c \
runtime/environ.c \
runtime/error.c \
runtime/fpu.c \
runtime/main.c \
runtime/memory.c \
runtime/pause.c \
@ -771,7 +772,7 @@ gfor_built_src = $(i_all_c) $(i_any_c) $(i_count_c) $(i_maxloc0_c) \
$(i_exponent_c) $(i_fraction_c) $(i_nearest_c) $(i_set_exponent_c) \
$(i_pow_c) \
selected_int_kind.inc selected_real_kind.inc kinds.h \
kinds.inc c99_protos.inc
kinds.inc c99_protos.inc fpu-target.h
# Machine generated specifics
@ -1394,6 +1395,9 @@ environ.lo: runtime/environ.c
error.lo: runtime/error.c
$(LIBTOOL) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o error.lo `test -f 'runtime/error.c' || echo '$(srcdir)/'`runtime/error.c
fpu.lo: runtime/fpu.c
$(LIBTOOL) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o fpu.lo `test -f 'runtime/fpu.c' || echo '$(srcdir)/'`runtime/fpu.c
main.lo: runtime/main.c
$(LIBTOOL) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o main.lo `test -f 'runtime/main.c' || echo '$(srcdir)/'`runtime/main.c
@ -2699,6 +2703,9 @@ selected_int_kind.inc: $(srcdir)/mk-sik-inc.sh
selected_real_kind.inc: $(srcdir)/mk-srk-inc.sh
$(SHELL) $(srcdir)/mk-srk-inc.sh '$(FCCOMPILE)' > $@
fpu-target.h: $(srcdir)/$(FPU_HOST_HEADER)
cp $(srcdir)/$(FPU_HOST_HEADER) $@
@MAINTAINER_MODE_TRUE@$(i_all_c): m4/all.m4 $(I_M4_DEPS1)
@MAINTAINER_MODE_TRUE@ m4 -Dfile=$@ -I$(srcdir)/m4 all.m4 > $(srcdir)/$@

6
libgfortran/config.h.in
View File

@ -285,6 +285,12 @@
/* libm includes fabsl */
#undef HAVE_FABSL
/* libm includes feenableexcept */
#undef HAVE_FEENABLEEXCEPT
/* Define to 1 if you have the <fenv.h> header file. */
#undef HAVE_FENV_H
/* libm includes finite */
#undef HAVE_FINITE

103
libgfortran/config/fpu-387.h Normal file
View File

@ -0,0 +1,103 @@
/* FPU-related code for x86 and x86_64 processors.
Copyright 2005 Free Software Foundation, Inc.
Contributed by Francois-Xavier Coudert <coudert@clipper.ens.fr>
This file is part of the GNU Fortran 95 runtime library (libgfortran).
Libgfortran is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
In addition to the permissions in the GNU General Public License, the
Free Software Foundation gives you unlimited permission to link the
compiled version of this file into combinations with other programs,
and to distribute those combinations without any restriction coming
from the use of this file. (The General Public License restrictions
do apply in other respects; for example, they cover modification of
the file, and distribution when not linked into a combine
executable.)
Libgfortran is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public
License along with libgfortran; see the file COPYING. If not,
write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA. */
static int
has_sse (void)
{
#ifdef __x86_64__
return 1;
#else
unsigned int eax, ebx, ecx, edx;
/* See if we can use cpuid. */
asm volatile ("pushfl; pushfl; popl %0; movl %0,%1; xorl %2,%0;"
"pushl %0; popfl; pushfl; popl %0; popfl"
: "=&r" (eax), "=&r" (ebx)
: "i" (0x00200000));
if (((eax ^ ebx) & 0x00200000) == 0)
return 0;
/* Check the highest input value for eax. */
asm volatile ("xchgl %%ebx, %1; cpuid; xchgl %%ebx, %1"
: "=a" (eax), "=r" (ebx), "=c" (ecx), "=d" (edx)
: "0" (0));
if (eax == 0)
return 0;
asm volatile ("xchgl %%ebx, %1; cpuid; xchgl %%ebx, %1"
: "=a" (eax), "=r" (ebx), "=c" (ecx), "=d" (edx)
: "0" (1));
if (edx & (1 << 25))
return 1;
return 0;
#endif
}
void set_fpu (void)
{
short cw;
int cw_sse;
/* i387 -- see linux <fpu_control.h> header file for details. */
#define _FPU_MASK_IM 0x01
#define _FPU_MASK_DM 0x02
#define _FPU_MASK_ZM 0x04
#define _FPU_MASK_OM 0x08
#define _FPU_MASK_UM 0x10
#define _FPU_MASK_PM 0x20
asm volatile ("fnstcw %0" : "=m" (cw));
cw |= _FPU_MASK_IM | _FPU_MASK_DM | _FPU_MASK_ZM | _FPU_MASK_OM | _FPU_MASK_UM | _FPU_MASK_PM;
if (options.fpe & GFC_FPE_INVALID) cw &= ~_FPU_MASK_IM;
if (options.fpe & GFC_FPE_DENORMAL) cw &= ~_FPU_MASK_DM;
if (options.fpe & GFC_FPE_ZERO) cw &= ~_FPU_MASK_ZM;
if (options.fpe & GFC_FPE_OVERFLOW) cw &= ~_FPU_MASK_OM;
if (options.fpe & GFC_FPE_UNDERFLOW) cw &= ~_FPU_MASK_UM;
if (options.fpe & GFC_FPE_PRECISION) cw &= ~_FPU_MASK_PM;
asm volatile ("fldcw %0" : : "m" (cw));
if (has_sse())
{
/* SSE */
asm volatile ("stmxcsr %0" : : "m" (cw_sse));
cw_sse &= 0xFFFF0000;
if (options.fpe & GFC_FPE_INVALID) cw_sse |= 1 << 7;
if (options.fpe & GFC_FPE_DENORMAL) cw_sse |= 1 << 8;
if (options.fpe & GFC_FPE_ZERO) cw_sse |= 1 << 9;
if (options.fpe & GFC_FPE_OVERFLOW) cw_sse |= 1 << 10;
if (options.fpe & GFC_FPE_UNDERFLOW) cw_sse |= 1 << 11;
if (options.fpe & GFC_FPE_PRECISION) cw_sse |= 1 << 12;
asm volatile ("ldmxcsr %0" : : "m" (cw_sse));
}
}

57
libgfortran/config/fpu-generic.h Normal file
View File

@ -0,0 +1,57 @@
/* Fallback FPU-related code (for systems not otherwise supported).
Copyright 2005 Free Software Foundation, Inc.
Contributed by Francois-Xavier Coudert <coudert@clipper.ens.fr>
This file is part of the GNU Fortran 95 runtime library (libgfortran).
Libgfortran is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
In addition to the permissions in the GNU General Public License, the
Free Software Foundation gives you unlimited permission to link the
compiled version of this file into combinations with other programs,
and to distribute those combinations without any restriction coming
from the use of this file. (The General Public License restrictions
do apply in other respects; for example, they cover modification of
the file, and distribution when not linked into a combine
executable.)
Libgfortran is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public
License along with libgfortran; see the file COPYING. If not,
write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA. */
/* Fallback FPU-related code for systems not otherwise supported. This
is mainly telling the user that we will not be able to do what he
requested. */
void
set_fpu (void)
{
if (options.fpe & GFC_FPE_INVALID)
st_printf ("Fortran runtime warning: IEEE 'invalid operation' "
"exception not supported.\n");
if (options.fpe & GFC_FPE_DENORMAL)
st_printf ("Fortran runtime warning: IEEE 'denormal number' "
"exception not supported.\n");
if (options.fpe & GFC_FPE_ZERO)
st_printf ("Fortran runtime warning: IEEE 'division by zero' "
"exception not supported.\n");
if (options.fpe & GFC_FPE_OVERFLOW)
st_printf ("Fortran runtime warning: IEEE 'overflow' "
"exception not supported.\n");
if (options.fpe & GFC_FPE_UNDERFLOW)
st_printf ("Fortran runtime warning: IEEE 'underflow' "
"exception not supported.\n");
if (options.fpe & GFC_FPE_PRECISION)
st_printf ("Fortran runtime warning: IEEE 'loss of precision' "
"exception not supported.\n");
}

93
libgfortran/config/fpu-glibc.h Normal file
View File

@ -0,0 +1,93 @@
/* FPU-related code for systems with GNU libc.
Copyright 2005 Free Software Foundation, Inc.
Contributed by Francois-Xavier Coudert <coudert@clipper.ens.fr>
This file is part of the GNU Fortran 95 runtime library (libgfortran).
Libgfortran is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
In addition to the permissions in the GNU General Public License, the
Free Software Foundation gives you unlimited permission to link the
compiled version of this file into combinations with other programs,
and to distribute those combinations without any restriction coming
from the use of this file. (The General Public License restrictions
do apply in other respects; for example, they cover modification of
the file, and distribution when not linked into a combine
executable.)
Libgfortran is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public
License along with libgfortran; see the file COPYING. If not,
write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA. */
/* FPU-related code for systems with the GNU libc, providing the
feenableexcept function in fenv.h to set individual exceptions
(there's nothing to do that in C99). */
#define __USE_GNU
#ifdef HAVE_FENV_H
#include <fenv.h>
#endif
void set_fpu (void)
{
fedisableexcept (FE_ALL_EXCEPT);
if (options.fpe & GFC_FPE_INVALID)
#ifdef FE_INVALID
feenableexcept (FE_INVALID);
#else
st_printf ("Fortran runtime warning: IEEE 'invalid operation' "
"exception not supported.\n");
#endif
/* glibc does never have a FE_DENORMAL. */
if (options.fpe & GFC_FPE_DENORMAL)
#ifdef FE_DENORMAL
feenableexcept (FE_DENORMAL);
#else
st_printf ("Fortran runtime warning: IEEE 'denormal number' "
"exception not supported.\n");
#endif
if (options.fpe & GFC_FPE_ZERO)
#ifdef FE_DIVBYZERO
feenableexcept (FE_DIVBYZERO);
#else
st_printf ("Fortran runtime warning: IEEE 'division by zero' "
"exception not supported.\n");
#endif
if (options.fpe & GFC_FPE_OVERFLOW)
#ifdef FE_OVERFLOW
feenableexcept (FE_OVERFLOW);
#else
st_printf ("Fortran runtime warning: IEEE 'overflow' "
"exception not supported.\n");
#endif
if (options.fpe & GFC_FPE_UNDERFLOW)
#ifdef FE_UNDERFLOW
feenableexcept (FE_UNDERFLOW);
#else
st_printf ("Fortran runtime warning: IEEE 'underflow' "
"exception not supported.\n");
#endif
if (options.fpe & GFC_FPE_PRECISION)
#ifdef FE_INEXACT
feenableexcept (FE_INEXACT);
#else
st_printf ("Fortran runtime warning: IEEE 'loss of precision' "
"exception not supported.\n");
#endif
}

94
libgfortran/configure vendored
View File

@ -308,7 +308,7 @@ ac_includes_default="\
# include <unistd.h>
#endif"
ac_subst_vars='SHELL PATH_SEPARATOR PACKAGE_NAME PACKAGE_TARNAME PACKAGE_VERSION PACKAGE_STRING PACKAGE_BUGREPORT exec_prefix prefix program_transform_name bindir sbindir libexecdir datadir sysconfdir sharedstatedir localstatedir libdir includedir oldincludedir infodir mandir build_alias host_alias target_alias DEFS ECHO_C ECHO_N ECHO_T LIBS build build_cpu build_vendor build_os host host_cpu host_vendor host_os target target_cpu target_vendor target_os INSTALL_PROGRAM INSTALL_SCRIPT INSTALL_DATA CYGPATH_W PACKAGE VERSION ACLOCAL AUTOCONF AUTOMAKE AUTOHEADER MAKEINFO install_sh STRIP ac_ct_STRIP INSTALL_STRIP_PROGRAM mkdir_p AWK SET_MAKE am__leading_dot AMTAR am__tar am__untar MAINTAINER_MODE_TRUE MAINTAINER_MODE_FALSE MAINT multi_basedir toolexecdir toolexeclibdir CC ac_ct_CC EXEEXT OBJEXT AM_FCFLAGS AM_CFLAGS AS ac_ct_AS AR ac_ct_AR RANLIB ac_ct_RANLIB LN_S LIBTOOL enable_shared enable_static FC FCFLAGS LDFLAGS ac_ct_FC extra_ldflags_libgfortran CPP CPPFLAGS EGREP LIBOBJS LTLIBOBJS'
ac_subst_vars='SHELL PATH_SEPARATOR PACKAGE_NAME PACKAGE_TARNAME PACKAGE_VERSION PACKAGE_STRING PACKAGE_BUGREPORT exec_prefix prefix program_transform_name bindir sbindir libexecdir datadir sysconfdir sharedstatedir localstatedir libdir includedir oldincludedir infodir mandir build_alias host_alias target_alias DEFS ECHO_C ECHO_N ECHO_T LIBS build build_cpu build_vendor build_os host host_cpu host_vendor host_os target target_cpu target_vendor target_os INSTALL_PROGRAM INSTALL_SCRIPT INSTALL_DATA CYGPATH_W PACKAGE VERSION ACLOCAL AUTOCONF AUTOMAKE AUTOHEADER MAKEINFO install_sh STRIP ac_ct_STRIP INSTALL_STRIP_PROGRAM mkdir_p AWK SET_MAKE am__leading_dot AMTAR am__tar am__untar MAINTAINER_MODE_TRUE MAINTAINER_MODE_FALSE MAINT multi_basedir toolexecdir toolexeclibdir CC ac_ct_CC EXEEXT OBJEXT AM_FCFLAGS AM_CFLAGS AS ac_ct_AS AR ac_ct_AR RANLIB ac_ct_RANLIB LN_S LIBTOOL enable_shared enable_static FC FCFLAGS LDFLAGS ac_ct_FC extra_ldflags_libgfortran CPP CPPFLAGS EGREP FPU_HOST_HEADER LIBOBJS LTLIBOBJS'
ac_subst_files=''
# Initialize some variables set by options.
@ -6507,7 +6507,8 @@ done
for ac_header in sys/mman.h sys/types.h sys/stat.h ieeefp.h
for ac_header in sys/mman.h sys/types.h sys/stat.h ieeefp.h fenv.h
do
as_ac_Header=`echo "ac_cv_header_$ac_header" | $as_tr_sh`
if eval "test \"\${$as_ac_Header+set}\" = set"; then
@ -19431,6 +19432,94 @@ _ACEOF
fi
# Check for GNU libc feenableexcept
echo "$as_me:$LINENO: checking for feenableexcept in -lm" >&5
echo $ECHO_N "checking for feenableexcept in -lm... $ECHO_C" >&6
if test "${ac_cv_lib_m_feenableexcept+set}" = set; then
echo $ECHO_N "(cached) $ECHO_C" >&6
else
ac_check_lib_save_LIBS=$LIBS
LIBS="-lm $LIBS"
if test x$gcc_no_link = xyes; then
{ { echo "$as_me:$LINENO: error: Link tests are not allowed after GCC_NO_EXECUTABLES." >&5
echo "$as_me: error: Link tests are not allowed after GCC_NO_EXECUTABLES." >&2;}
{ (exit 1); exit 1; }; }
fi
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h. */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h. */
/* Override any gcc2 internal prototype to avoid an error. */
#ifdef __cplusplus
extern "C"
#endif
/* We use char because int might match the return type of a gcc2
builtin and then its argument prototype would still apply. */
char feenableexcept ();
int
main ()
{
feenableexcept ();
;
return 0;
}
_ACEOF
rm -f conftest.$ac_objext conftest$ac_exeext
if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
(eval $ac_link) 2>conftest.er1
ac_status=$?
grep -v '^ *+' conftest.er1 >conftest.err
rm -f conftest.er1
cat conftest.err >&5
echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); } &&
{ ac_try='test -z "$ac_c_werror_flag"
|| test ! -s conftest.err'
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
(eval $ac_try) 2>&5
ac_status=$?
echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); }; } &&
{ ac_try='test -s conftest$ac_exeext'
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
(eval $ac_try) 2>&5
ac_status=$?
echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); }; }; then
ac_cv_lib_m_feenableexcept=yes
else
echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5
ac_cv_lib_m_feenableexcept=no
fi
rm -f conftest.err conftest.$ac_objext \
conftest$ac_exeext conftest.$ac_ext
LIBS=$ac_check_lib_save_LIBS
fi
echo "$as_me:$LINENO: result: $ac_cv_lib_m_feenableexcept" >&5
echo "${ECHO_T}$ac_cv_lib_m_feenableexcept" >&6
if test $ac_cv_lib_m_feenableexcept = yes; then
have_feenableexcept=yes
cat >>confdefs.h <<\_ACEOF
#define HAVE_FEENABLEEXCEPT 1
_ACEOF
fi
# Runs configure.host to set up necessary host-dependent shell variables.
# We then display a message about it, and propagate them through the
# build chain.
. ${srcdir}/configure.host
{ echo "$as_me:$LINENO: FPU dependent file will be ${fpu_host}.h" >&5
echo "$as_me: FPU dependent file will be ${fpu_host}.h" >&6;}
FPU_HOST_HEADER=config/${fpu_host}.h
# The standard autoconf HAVE_STRUCT_TIMEZONE doesn't actually check
# for struct timezone, as you might think. We also need to check how
# to call gettimeofday if we have it.
@ -21031,6 +21120,7 @@ s,@extra_ldflags_libgfortran@,$extra_ldflags_libgfortran,;t t
s,@CPP@,$CPP,;t t
s,@CPPFLAGS@,$CPPFLAGS,;t t
s,@EGREP@,$EGREP,;t t
s,@FPU_HOST_HEADER@,$FPU_HOST_HEADER,;t t
s,@LIBOBJS@,$LIBOBJS,;t t
s,@LTLIBOBJS@,$LTLIBOBJS,;t t
CEOF

13
libgfortran/configure.ac
View File

@ -158,7 +158,7 @@ AC_TYPE_OFF_T
AC_STDC_HEADERS
AC_HAVE_HEADERS(stdlib.h stdio.h string.h stddef.h math.h unistd.h signal.h)
AC_CHECK_HEADERS(time.h sys/params.h sys/time.h sys/times.h sys/resource.h)
AC_CHECK_HEADERS(sys/mman.h sys/types.h sys/stat.h ieeefp.h)
AC_CHECK_HEADERS(sys/mman.h sys/types.h sys/stat.h ieeefp.h fenv.h)
AC_CHECK_HEADER([complex.h],[AC_DEFINE([HAVE_COMPLEX_H], [1], [complex.h exists])])
AC_CHECK_MEMBERS([struct stat.st_blksize])
@ -340,6 +340,17 @@ LIBGFOR_CHECK_FOR_BROKEN_FPCLASSIFY
# Fallback in case isfinite is not available.
AC_CHECK_LIB([m],[finite],[AC_DEFINE([HAVE_FINITE],[1],[libm includes finite])])
# Check for GNU libc feenableexcept
AC_CHECK_LIB([m],[feenableexcept],[have_feenableexcept=yes AC_DEFINE([HAVE_FEENABLEEXCEPT],[1],[libm includes feenableexcept])])
# Runs configure.host to set up necessary host-dependent shell variables.
# We then display a message about it, and propagate them through the
# build chain.
. ${srcdir}/configure.host
AC_MSG_NOTICE([FPU dependent file will be ${fpu_host}.h])
FPU_HOST_HEADER=config/${fpu_host}.h
AC_SUBST(FPU_HOST_HEADER)
# The standard autoconf HAVE_STRUCT_TIMEZONE doesn't actually check
# for struct timezone, as you might think. We also need to check how
# to call gettimeofday if we have it.

32
libgfortran/configure.host Normal file
View File

@ -0,0 +1,32 @@
# configure.host
#
# This shell script handles all host based configuration for libgfortran.
# It sets various shell variables based on the the host triplet.
# You can modify this shell script without rerunning autoconf/aclocal/etc.
# This file is "sourced", not executed.
#
#
# It uses the following shell variables as set by config.guess:
# host The configuration host (full CPU-vendor-OS triplet)
# host_cpu The configuration host CPU
# host_os The configuration host OS
#
#
# It sets the following shell variables:
#
# fpu_host FPU-specific code file, defaults to fpu-generic.
# DEFAULTS
fpu_host=fpu-generic
# HOST-SPECIFIC OVERRIDES
case "${host_cpu}" in
i?86 | x86_64)
fpu_host='fpu-387' ;;
esac
# CONFIGURATION-SPECIFIC OVERRIDES
if test "x${have_feenableexcept}" = "xyes"; then
fpu_host='fpu-glibc'
fi

16
libgfortran/libgfortran.h
View File

@ -337,8 +337,7 @@ typedef struct
int mem_check;
int use_stderr, all_unbuffered, default_recl;
int fpu_round, fpu_precision, fpu_invalid, fpu_denormal, fpu_zerodiv,
fpu_overflow, fpu_underflow, fpu_precision_loss;
int fpu_round, fpu_precision, fpe;
int sighup, sigint;
}
@ -410,6 +409,14 @@ error_codes;
#define GFC_STD_F95_OBS (1<<1) /* Obsoleted in F95. */
#define GFC_STD_F77 (1<<0) /* Up to and including F77. */
/* Bitmasks for the various FPE that can be enabled.
Keep them in sync with their counterparts in gcc/fortran/gfortran.h. */
#define GFC_FPE_INVALID (1<<0)
#define GFC_FPE_DENORMAL (1<<1)
#define GFC_FPE_ZERO (1<<2)
#define GFC_FPE_OVERFLOW (1<<3)
#define GFC_FPE_UNDERFLOW (1<<4)
#define GFC_FPE_PRECISION (1<<5)
/* The filename and line number don't go inside the globals structure.
They are set by the rest of the program and must be linked to. */
@ -485,6 +492,11 @@ internal_proto(translate_error);
extern void generate_error (int, const char *);
internal_proto(generate_error);
/* fpu.c */
extern void set_fpu (void);
internal_proto(set_fpu);
/* memory.c */
extern void *get_mem (size_t) __attribute__ ((malloc));

24
libgfortran/runtime/environ.c
View File

@ -533,30 +533,6 @@ static variable variable_table[] = {
show_precision,
"Precision of intermediate results. Values are 24, 53 and 64.", 0},
{"GFORTRAN_FPU_INVALID", 1, &options.fpu_invalid, init_boolean,
show_boolean,
"Raise a floating point exception on invalid FP operation.", 0},
{"GFORTRAN_FPU_DENORMAL", 1, &options.fpu_denormal, init_boolean,
show_boolean,
"Raise a floating point exception when denormal numbers are encountered.",
0},
{"GFORTRAN_FPU_ZERO", 0, &options.fpu_zerodiv, init_boolean, show_boolean,
"Raise a floating point exception when dividing by zero.", 0},
{"GFORTRAN_FPU_OVERFLOW", 0, &options.fpu_overflow, init_boolean,
show_boolean,
"Raise a floating point exception on overflow.", 0},
{"GFORTRAN_FPU_UNDERFLOW", 0, &options.fpu_underflow, init_boolean,
show_boolean,
"Raise a floating point exception on underflow.", 0},
{"GFORTRAN_FPU_PRECISION", 0, &options.fpu_precision_loss, init_boolean,
show_boolean,
"Raise a floating point exception on precision loss.", 0},
{NULL, 0, NULL, NULL, NULL, NULL, 0}
};

16
libgfortran/runtime/fpu.c Normal file
View File

@ -0,0 +1,16 @@
#include "libgfortran.h"
/* We include the platform-dependent code. */
#include "fpu-target.h"
/* Function called by the front-end to tell us
when a FPE should be raised. */
extern void set_fpe (int);
export_proto(set_fpe);
void
set_fpe (int exceptions)
{
options.fpe = exceptions;
set_fpu ();
}

1
libgfortran/runtime/main.c
View File

@ -96,6 +96,7 @@ init (void)
init_variables ();
init_units ();
set_fpu ();
init_compile_options ();
#ifdef DEBUG