[Bug c/85789] New: Signed integer overflow with nonzero optimization in cse.c

[zeccav at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85789

            Bug ID: 85789
           Summary: Signed integer overflow with nonzero optimization in
                    cse.c
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zeccav at gmail dot com
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu

// Signed integer overflow in sanitized version of gcc trunk 260152
// Taken from testcase pr82596.c
// Must be compiled with nonzero optimization 
// ../../gcc/gcc/cse.c:2194:34: runtime error: signed integer overflow: 1 -
-9223372036854775807 cannot be represented in type 'long int'
//
#define SSIZE_MAX __PTRDIFF_MAX__
#define SSIZE_MIN (-SSIZE_MAX - 1)

void s (int, ...);


void test (int i)
{
  s (""[SSIZE_MIN + 1]);                
  s (""[1]);                           
}