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author | vlefevre <vlefevre@280ebfd0-de03-0410-8827-d642c229c3f4> | 2017-10-06 15:08:25 +0000 |
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committer | vlefevre <vlefevre@280ebfd0-de03-0410-8827-d642c229c3f4> | 2017-10-06 15:08:25 +0000 |
commit | 77abb495a79dd47f3b52211b67a63b49f703ed5a (patch) | |
tree | 782b5cca93f68ef1416624a40558c3949cb41c6c /src/get_sj.c | |
parent | ae7902db33cc735974eef090ce9a2c35f4dd6c32 (diff) | |
download | mpfr-77abb495a79dd47f3b52211b67a63b49f703ed5a.tar.gz |
[src/{get_si.c,get_sj.c}] Minor improvement, removing an obsolete note
in get_sj.c at the same time.
git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@11775 280ebfd0-de03-0410-8827-d642c229c3f4
Diffstat (limited to 'src/get_sj.c')
-rw-r--r-- | src/get_sj.c | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/src/get_sj.c b/src/get_sj.c index c49206849..b2e04c6c9 100644 --- a/src/get_sj.c +++ b/src/get_sj.c @@ -47,13 +47,11 @@ mpfr_get_sj (mpfr_srcptr f, mpfr_rnd_t rnd) if (MPFR_IS_ZERO (f)) return (intmax_t) 0; - /* determine the precision of intmax_t */ - for (r = MPFR_INTMAX_MIN, prec = 0; r != 0; r /= 2, prec++) + /* Determine the precision of intmax_t. |INTMAX_MIN| may have one + more bit as an integer, but in this case, this is a power of 2, + thus fits in a precision-prec floating-point number. */ + for (r = MPFR_INTMAX_MAX, prec = 0; r != 0; r /= 2, prec++) { } - /* Note: though INTMAX_MAX would have been sufficient for the conversion, - we chose INTMAX_MIN so that INTMAX_MIN - 1 is always representable in - precision prec; this is useful to detect overflows in MPFR_RNDZ (will - be needed later). */ MPFR_ASSERTD (r == 0); @@ -74,15 +72,15 @@ mpfr_get_sj (mpfr_srcptr f, mpfr_rnd_t rnd) xp = MPFR_MANT (x); sh = MPFR_GET_EXP (x); - MPFR_ASSERTN ((mpfr_prec_t) sh <= prec); + MPFR_ASSERTN ((mpfr_prec_t) sh <= prec + 1); if (MPFR_INTMAX_MIN + MPFR_INTMAX_MAX != 0 - && MPFR_UNLIKELY ((mpfr_prec_t) sh == prec)) + && MPFR_UNLIKELY ((mpfr_prec_t) sh > prec)) { /* 2's complement and x <= INTMAX_MIN: in the case mp_limb_t has the same size as intmax_t, we cannot use the code in the for loop since the operations would be performed in unsigned arithmetic. */ - MPFR_ASSERTN (MPFR_IS_NEG (x) && (mpfr_powerof2_raw (x))); + MPFR_ASSERTN (MPFR_IS_NEG (x) && mpfr_powerof2_raw (x)); r = MPFR_INTMAX_MIN; } else if (MPFR_IS_POS (x)) |