optimization/9123: [3.2/3.3/3.4 regression ] Internal compiler error in do_SUBST at combine.c:434

[jason@gcc.gnu.org]

Synopsis: [3.2/3.3/3.4 regression ] Internal compiler error in do_SUBST at combine.c:434

State-Changed-From-To: analyzed->open
State-Changed-By: jason
State-Changed-When: Mon Mar 10 22:37:43 2003
State-Changed-Why:
    Not a c++-specific bug; it's dying because it's trying to substitute (unsigned char)-1 for a QI reg, but combine doesn't like that because (HOST_WIDE_INT)255 != (HOST_WIDE_INT)-1.  Here's a C testcase:
    
    typedef unsigned char T;
    inline T clamp (T in, T min, T max)
    {
      return in <= min ? min : in >= max ? max : in;
    }
    unsigned char f (int i)
    {
      return clamp (i, 0, 255);
    }

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9123