math: fix test vectors for logb

[libc-test] / src / math / gen / mp.c

diff --git a/src/math/gen/mp.c b/src/math/gen/mp.c
index 177bc8b..50182e3 100644 (file)
--- a/src/math/gen/mp.c
+++ b/src/math/gen/mp.c
@@ -469,7 +469,7 @@ int mplogb(struct t *t)
        MPFR_DECL_INIT(mx, 53);
 
        mpfr_set_d(mx, t->x, MPFR_RNDN);
-       t->y = mpfr_get_exp(mx) + 1;
+       t->y = mpfr_get_exp(mx) - 1;
        t->dy = 0;
        t->e = 0;
        return 0;
@@ -479,7 +479,7 @@ int mplogbf(struct t *t)
        MPFR_DECL_INIT(mx, 24);
 
        mpfr_set_flt(mx, t->x, MPFR_RNDN);
-       t->y = mpfr_get_exp(mx) + 1;
+       t->y = mpfr_get_exp(mx) - 1;
        t->dy = 0;
        t->e = 0;
        return 0;
@@ -489,7 +489,7 @@ int mplogbl(struct t *t)
        MPFR_DECL_INIT(mx, 64);
 
        mpfr_set_ld(mx, t->x, MPFR_RNDN);
-       t->y = mpfr_get_exp(mx) + 1;
+       t->y = mpfr_get_exp(mx) - 1;
        t->dy = 0;
        t->e = 0;
        return 0;