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re PR libfortran/32611 (Print sign of negative zero) 

2007-07-15  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
	    Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>

	PR fortran/32611
	* runtime/compile_options.c (set_std): Remove.
	(set_options): New function.
	(init_compile_options): Add initialization for -fsign-zero option.
	* gfortran.map (GFORTRAN_1.0): Rename _gfortran_set_std into
	_gfortran_set_options.
	* libgfortran.h (compile_options_t): Add sign_zero field.
	* io/write.c (output_float): Use the sign bit of the value to determine
	if a negative sign should be emitted for zero values.  Do not emit the
	negative sign for zero if -fno-sign-zero was set during compile.

Co-Authored-By: Francois-Xavier Coudert <fxcoudert@gcc.gnu.org>

From-SVN: r126654
This commit is contained in:
Jerry DeLisle 2007-07-15 16:26:22 +00:00
parent 639d3040d4
commit 2bb6de3a7e
5 changed files with 52 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
libgfortran/ChangeLog
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@ -1,3 +1,17 @@
2007-07-15 Jerry DeLisle <jvdelisle@gcc.gnu.org>
Francois-Xavier Coudert <fxcoudert@gcc.gnu.org>
PR fortran/32611
* runtime/compile_options.c (set_std): Remove.
(set_options): New function.
(init_compile_options): Add initialization for -fsign-zero option.
* gfortran.map (GFORTRAN_1.0): Rename _gfortran_set_std into
_gfortran_set_options.
* libgfortran.h (compile_options_t): Add sign_zero field.
* io/write.c (output_float): Use the sign bit of the value to determine
if a negative sign should be emitted for zero values. Do not emit the
negative sign for zero if -fno-sign-zero was set during compile.
2007-07-14 Jerry DeLisle <jvdelisle@gcc.gnu.org>
PR libgfortran/32752

2
libgfortran/gfortran.map
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@ -590,7 +590,7 @@ GFORTRAN_1.0 {
_gfortran_set_fpe;
_gfortran_set_max_subrecord_length;
_gfortran_set_record_marker;
_gfortran_set_std;
_gfortran_set_options;
_gfortran_shape_16;
_gfortran_shape_4;
_gfortran_shape_8;

22
libgfortran/io/write.c
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@ -465,6 +465,7 @@ output_float (st_parameter_dt *dtp, const fnode *f, GFC_REAL_LARGEST value)
int leadzero;
int nblanks;
int i;
int sign_bit;
sign_t sign;
ft = f->format;
@ -482,6 +483,7 @@ output_float (st_parameter_dt *dtp, const fnode *f, GFC_REAL_LARGEST value)
For an N digit exponent, this gives us (MIN_FIELD_WIDTH-5)-N digits
after the decimal point, plus another one before the decimal point. */
sign = calculate_sign (dtp, value < 0.0);
sign_bit = signbit (value);
if (value < 0)
value = -value;
@ -547,9 +549,15 @@ output_float (st_parameter_dt *dtp, const fnode *f, GFC_REAL_LARGEST value)
/* Read the exponent back in. */
e = atoi (&buffer[ndigits + 3]) + 1;
/* Make sure zero comes out as 0.0e0. */
/* Make sure zero comes out as 0.0e0. */
if (value == 0.0)
e = 0;
{
e = 0;
if (compile_options.sign_zero == 1)
sign = calculate_sign (dtp, sign_bit);
else
sign = calculate_sign (dtp, 0);
}
/* Normalize the fractional component. */
buffer[2] = buffer[1];
@ -751,7 +759,14 @@ output_float (st_parameter_dt *dtp, const fnode *f, GFC_REAL_LARGEST value)
break;
}
if (i == ndigits)
sign = calculate_sign (dtp, 0);
{
/* The output is zero, so set the sign according to the sign bit unless
-fno-sign-zero was specified. */
if (compile_options.sign_zero == 1)
sign = calculate_sign (dtp, sign_bit);
else
sign = calculate_sign (dtp, 0);
}
/* Work out how much padding is needed. */
nblanks = w - (nbefore + nzero + nafter + edigits + 1);
@ -776,7 +791,6 @@ output_float (st_parameter_dt *dtp, const fnode *f, GFC_REAL_LARGEST value)
/* Pad to full field width. */
if ( ( nblanks > 0 ) && !dtp->u.p.no_leading_blank)
{
memset (out, ' ', nblanks);

1
libgfortran/libgfortran.h
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@ -382,6 +382,7 @@ typedef struct
int convert;
int dump_core;
int backtrace;
int sign_zero;
size_t record_marker;
int max_subrecord_length;
}

33
libgfortran/runtime/compile_options.c
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@ -1,5 +1,5 @@
/* Handling of compile-time options that influence the library.
Copyright (C) 2005 Free Software Foundation, Inc.
Copyright (C) 2005, 2007 Free Software Foundation, Inc.
This file is part of the GNU Fortran 95 runtime library (libgfortran).
@ -35,23 +35,25 @@ Boston, MA 02110-1301, USA. */
/* Useful compile-time options will be stored in here. */
compile_options_t compile_options;
/* Prototypes */
extern void set_std (GFC_INTEGER_4, GFC_INTEGER_4, GFC_INTEGER_4,
GFC_INTEGER_4, GFC_INTEGER_4);
export_proto(set_std);
/* Set the usual compile-time options. */
extern void set_options (int , int []);
export_proto(set_options);
void
set_std (GFC_INTEGER_4 warn_std, GFC_INTEGER_4 allow_std,
GFC_INTEGER_4 pedantic, GFC_INTEGER_4 dump_core,
GFC_INTEGER_4 backtrace)
set_options (int num, int options[])
{
compile_options.pedantic = pedantic;
compile_options.warn_std = warn_std;
compile_options.allow_std = allow_std;
compile_options.dump_core = dump_core;
compile_options.backtrace = backtrace;
if (num >= 1)
compile_options.warn_std = options[0];
if (num >= 2)
compile_options.allow_std = options[1];
if (num >= 3)
compile_options.pedantic = options[2];
if (num >= 4)
compile_options.dump_core = options[3];
if (num >= 5)
compile_options.backtrace = options[4];
if (num >= 6)
compile_options.sign_zero = options[5];
}
@ -67,6 +69,7 @@ init_compile_options (void)
compile_options.pedantic = 0;
compile_options.dump_core = 0;
compile_options.backtrace = 0;
compile_options.sign_zero = 1;
}
/* Function called by the front-end to tell us the