From mboxrd@z Thu Jan  1 00:00:00 1970
From: Joern Rennecke <amylaar@cambridge.redhat.com>
To: aoliva@redhat.com (Alexandre Oliva)
Cc: wilson@cygnus.com (Jim Wilson), gcc@gcc.gnu.org, gcc-patches@gcc.gnu.org, gdb@sources.redhat.com
Subject: Re: C++ ptrmemfun break if FUNCTION_BOUNDARY < 2 * BITS_PER_UNIT
Date: Mon, 09 Apr 2001 12:29:00 -0000
Message-id: <200104091927.f39JRtw00873@phal.cambridge.redhat.com>
References: <orofu6xfro.fsf@guarana.lsd.ic.unicamp.br>
X-SW-Source: 2001-04/msg00074.html

 Is it safe to use arithmetic SHIFTs instead of letting the compiler
> choose them instead of DIVs and MULTs?  For some reason, on
> mn10300-elf, the div makes it to the generated code, which we
> certainly don't want.

A signed division is not a portable way to extract a bit.  And for
negative values, it just doesn't work.
Why don't you use an unsigned division or a logical shift?