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(eval4): Detect overflow properly when multiplying INTMAX_MIN * -1.

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Paul Eggert
2006-06-08 02:53:25 +00:00
parent 0eef2e1e8b
commit cad27cdc2e
2 changed files with 9 additions and 2 deletions
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4
src/expr.c
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@@ -640,7 +640,9 @@ eval4 (bool evaluate)
if (fxn == multiply)
{
val = l->u.i * r->u.i;
if (! (l->u.i == 0 || val / l->u.i == r->u.i))
if (! (l->u.i == 0 || r->u.i == 0
|| ((val < 0) == ((l->u.i < 0) ^ (r->u.i < 0))
&& val / l->u.i == r->u.i)))
integer_overflow ('*');
}
else