This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
Re: optimization/9123: [3.2/3.3/3.4 regression ] Internal compiler error in do_SUBST at combine.c:434
- From: jason at gcc dot gnu dot org
- To: gcc-bugs at gcc dot gnu dot org, gcc-prs at gcc dot gnu dot org, khindenburg at cherrynebula dot net, nobody at gcc dot gnu dot org
- Date: 10 Mar 2003 22:37:43 -0000
- Subject: Re: optimization/9123: [3.2/3.3/3.4 regression ] Internal compiler error in do_SUBST at combine.c:434
- Reply-to: jason at gcc dot gnu dot org, gcc-bugs at gcc dot gnu dot org, gcc-prs at gcc dot gnu dot org, khindenburg at cherrynebula dot net, nobody at gcc dot gnu dot org, gcc-gnats at gcc dot gnu dot 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