diff options
Diffstat (limited to 'gcc/real.c')
| -rw-r--r-- | gcc/real.c | 26 |
1 files changed, 17 insertions, 9 deletions
@@ -1552,20 +1552,28 @@ real_to_decimal (str, r_orig, buf_size, digits, crop_trailing_zeros) /* Find power of 10. Do this by dividing out 10**2**M when this is larger than the current remainder. Fill PTEN with the power of 10 that we compute. */ - m = floor_log2 ((int)(r.exp * M_LOG10_2)) + 1; - do + if (r.exp > 0) { - const REAL_VALUE_TYPE *ptentwo = ten_to_ptwo (m); - if (do_compare (&u, ptentwo, 0) >= 0) + m = floor_log2 ((int)(r.exp * M_LOG10_2)) + 1; + do { - do_divide (&u, &u, ptentwo); - do_multiply (&pten, &pten, ptentwo); - dec_exp += 1 << m; + const REAL_VALUE_TYPE *ptentwo = ten_to_ptwo (m); + if (do_compare (&u, ptentwo, 0) >= 0) + { + do_divide (&u, &u, ptentwo); + do_multiply (&pten, &pten, ptentwo); + dec_exp += 1 << m; + } } + while (--m >= 0); } - while (--m >= 0); + else + /* We managed to divide off enough tens in the above reduction + loop that we've now got a negative exponent. Fall into the + less-than-one code to compute the proper value for PTEN. */ + cmp_one = -1; } - else if (cmp_one < 0) + if (cmp_one < 0) { int m; |