search for: de05bf63

On 10/03/2013 04:15 PM, Michele Scandale wrote: > On 10/03/2013 01:22 AM, Andrew Trick wrote: >> >> I’m not sure how to make sense of an NUW flag coming from a sub. >> >> NSW is just a misnomer for signed overflow. SCEV canonicalizes sub a,b to add a, (-b). Unfortunately, signed overflow is not the same thing for sub and add... >> >> sub nsw %a, %b != add nsw

On 10/03/2013 01:22 AM, Andrew Trick wrote: > > I’m not sure how to make sense of an NUW flag coming from a sub. > > NSW is just a misnomer for signed overflow. SCEV canonicalizes sub a,b to add a, (-b). Unfortunately, signed overflow is not the same thing for sub and add... > > sub nsw %a, %b != add nsw %a, (-1 * %b) > > sub nsw i32, -1, INT_MIN is true. > > add