[Bug inline-asm/11925] New: segment violation due to incorrect operand constraints

[jbeulich at novell dot com]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11925

           Summary: segment violation due to incorrect operand constraints
           Product: gcc
           Version: 3.3.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: inline-asm
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jbeulich at novell dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu

(i386 specific) Accessing an operand with constraint "r" through "%h0" causes a
segment violation (or other misbehavior) because print_reg() does not range
check REGNO(x) prior to indexing into the (only 4 elements long)
qi_high_reg_name array.
Interestingly the x86-64 specific code dealing with the REX registers does some
validation is that certain combinations result in error() being called.