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-rw-r--r--ext/bigdecimal/bigdecimal.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/ext/bigdecimal/bigdecimal.c b/ext/bigdecimal/bigdecimal.c
index f426a45..ffc6613 100644
--- a/ext/bigdecimal/bigdecimal.c
+++ b/ext/bigdecimal/bigdecimal.c
@@ -2874,8 +2874,9 @@ BigMath_s_log(VALUE klass, VALUE x, VALUE vprec)
goto get_vp_value;
case T_BIGNUM:
- zero = RBIGNUM_ZERO_P(x);
- negative = RBIGNUM_NEGATIVE_P(x);
+ i = FIX2INT(rb_big_cmp(x, INT2FIX(0)));
+ zero = i == 0;
+ negative = i < 0;
get_vp_value:
if (zero || negative) break;
vx = GetVpValue(x, 0);