diff options
Diffstat (limited to 'gcc/real.c')
| -rw-r--r-- | gcc/real.c | 15 |
1 files changed, 11 insertions, 4 deletions
@@ -5242,13 +5242,19 @@ real_nextafter (REAL_VALUE_TYPE *r, format_helper fmt, /* Write into BUF the maximum representable finite floating-point number, (1 - b**-p) * b**emax for a given FP format FMT as a hex float string. LEN is the size of BUF, and the buffer must be large - enough to contain the resulting string. */ + enough to contain the resulting string. If NORM_MAX, instead write + the maximum representable finite normalized floating-point number, + defined to be such that all choices of digits for that exponent are + representable in the format (this only makes a difference for IBM + long double). */ void -get_max_float (const struct real_format *fmt, char *buf, size_t len) +get_max_float (const struct real_format *fmt, char *buf, size_t len, + bool norm_max) { int i, n; char *p; + bool is_ibm_extended = fmt->pnan < fmt->p; strcpy (buf, "0x0."); n = fmt->p; @@ -5256,8 +5262,9 @@ get_max_float (const struct real_format *fmt, char *buf, size_t len) *p++ = 'f'; if (i < n) *p++ = "08ce"[n - i]; - sprintf (p, "p%d", fmt->emax); - if (fmt->pnan < fmt->p) + sprintf (p, "p%d", + (is_ibm_extended && norm_max) ? fmt->emax - 1 : fmt->emax); + if (is_ibm_extended && !norm_max) { /* This is an IBM extended double format made up of two IEEE doubles. The value of the long double is the sum of the |