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trans-const.c (gfc_conv_mpfr_to_tree): Use hexadecimal string as intermediate representation. 

* trans-const.c (gfc_conv_mpfr_to_tree): Use hexadecimal string as
intermediate representation.

From-SVN: r98619
This commit is contained in:
Tobias Schlüter 2005-04-23 17:19:06 +02:00 committed by Tobias Schlüter
parent 906532aaa9
commit 855a145c55
2 changed files with 22 additions and 15 deletions
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5
gcc/fortran/ChangeLog
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@ -1,3 +1,8 @@
2005-04-23 Tobias Schl"uter <tobias.schlueter@physik.uni-muenchen.de>
* trans-const.c (gfc_conv_mpfr_to_tree): Use hexadecimal string as
intermediate representation.
2005-04-21 Steven G. Kargl <kargls@comcast.net>
* trans-const.c (gfc_conv_mpfr_to_tree): Remove unneeded computation;

32
gcc/fortran/trans-const.c
View File

@ -224,27 +224,29 @@ gfc_conv_mpfr_to_tree (mpfr_t f, int kind)
char *p, *q;
int n;
for (n = 0; gfc_real_kinds[n].kind != 0; n++)
{
if (gfc_real_kinds[n].kind == kind)
break;
}
gcc_assert (gfc_real_kinds[n].kind);
n = gfc_validate_kind (BT_REAL, kind, false);
/* A decimal representation is used here, which requires the additional
two characters for rounding. TODO: Use a hexadecimal representation
to avoid rounding issues. */
p = mpfr_get_str (NULL, &exp, 10, gfc_real_kinds[n].precision+2,
gcc_assert (gfc_real_kinds[n].radix == 2);
/* mpfr chooses too small a number of hexadecimal digits if the
number of binary digits is not divisible by four, therefore we
have to explicitly request a sufficient number of digits here. */
p = mpfr_get_str (NULL, &exp, 16, gfc_real_kinds[n].digits / 4 + 1,
f, GFC_RND_MODE);
gcc_assert (p);
/* The additional 10 characters add space for the sprintf below. */
q = (char *) gfc_getmem (strlen (p) + 10);
/* REAL_VALUE_ATOF expects the exponent for mantissae * 2**exp,
mpfr_get_str returns the exponent for mantissa * 16**exp, adjust
for that. */
exp *= 4;
/* The additional 12 characters add space for the sprintf below.
This leaves 6 digits for the exponent which is certainly enough. */
q = (char *) gfc_getmem (strlen (p) + 12);
if (p[0] == '-')
sprintf (q, "-.%se%d", &p[1], (int) exp);
sprintf (q, "-0x.%sp%d", &p[1], (int) exp);
else
sprintf (q, ".%se%d", p, (int) exp);
sprintf (q, "0x.%sp%d", p, (int) exp);
type = gfc_get_real_type (kind);
res = build_real (type, REAL_VALUE_ATOF (q, TYPE_MODE (type)));