diff options
Diffstat (limited to 'gcc/real.c')
| -rw-r--r-- | gcc/real.c | 21 |
1 files changed, 18 insertions, 3 deletions
@@ -3261,8 +3261,23 @@ encode_ibm_extended (fmt, buf, r) u = *r; clear_significand_below (&u, SIGNIFICAND_BITS - 53); - /* v = remainder containing additional 53 bits of significand. */ - do_add (&v, r, &u, 1); + normalize (&u); + /* If the upper double is zero, we have a denormal double, so + move it to the first double and leave the second as zero. */ + if (u.class == rvc_zero) + { + v = u; + u = *r; + normalize (&u); + } + else + { + /* v = remainder containing additional 53 bits of significand. */ + do_add (&v, r, &u, 1); + round_for_format (&ieee_double_format, &v); + } + + round_for_format (&ieee_double_format, &u); encode_ieee_double (&ieee_double_format, &buf[0], &u); encode_ieee_double (&ieee_double_format, &buf[2], &v); @@ -3299,7 +3314,7 @@ const struct real_format ibm_extended_format = 2, 1, 53 + 53, - -1021, + -1021 + 53, 1024, -1, true, |