[Bug tree-optimization/119471] (a * b) != 0 then we know that both a!=0 & b != 0

[amacleod at redhat dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119471

Andrew Macleod <amacleod at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2025-03-26
             Status|UNCONFIRMED                 |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |amacleod at redhat dot 
com
                 CC|                            |amacleod at redhat dot com

--- Comment #1 from Andrew Macleod <amacleod at redhat dot com> ---
Created attachment 60889
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=60889&action=edit
Patch

This is pretty trivial to fix.  Range ops just need to have
operator_mult::op1_range tweaked to tell it that if the LHS does not contain
zero, then the operand is non-zero.