diff options
Diffstat (limited to 'tests/tsub.c')
| -rw-r--r-- | tests/tsub.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/tests/tsub.c b/tests/tsub.c index 21c41807b..a9e55a403 100644 --- a/tests/tsub.c +++ b/tests/tsub.c @@ -1213,12 +1213,16 @@ static void test_ubf (void) for (k = -kn; k <= kn; k++) { + /* exponent: e[j] + k, with |k| <= kn */ mpz_set (MPFR_ZEXP (x[1]), MPFR_ZEXP (x[0])); for (neg = 0; neg <= 1; neg++) { RND_LOOP (rnd) { + /* Note: x[0] and x[1] are equal MPFR numbers, but do not + test mpfr_sub with arg2 == arg3 as pointers in order to + skip potentially optimized mpfr_sub code. */ inexact = mpfr_sub (z, p[0], p[1], (mpfr_rnd_t) rnd); if (inexact != 0 || MPFR_NOTZERO (z) || (rnd != MPFR_RNDD ? MPFR_IS_NEG (z) : MPFR_IS_POS (z))) |