On 06/06/2017 04:31 AM, Marek Polacek wrote:
> Another case of extract_muldiv running off the rails. Here it did a wrong
> distribution; turning
>
> ((A * x) - (B * x)) * -6
>
> into
>
> (A' * x) - (B' * x)
>
> incurred an overflow in the subtraction. The fix is essentially the same
> as what I did in sanitizer/80800.
>
> Bootstrapped/regtested on x86_64-linux, ok for trunk/7/6?
>
> 2017-06-06 Marek Polacek <pola...@redhat.com>
>
> PR sanitizer/80932
> * fold-const.c (extract_muldiv_1) <case MINUS_EXPR>: Add
> TYPE_OVERFLOW_WRAPS check.
>
> * c-c++-common/ubsan/pr80932.c: New test.
OK
jeff
