From: Richard Earnshaw <rearnsha@arm.com>
To: Alexandre Oliva <aoliva@redhat.com>
Cc: Joern Rennecke <amylaar@redhat.com>,
wilson@cygnus.com (Jim Wilson),
gcc@gcc.gnu.org, gcc-patches@gcc.gnu.org, gdb@sources.redhat.com,
Richard.Earnshaw@arm.com
Subject: Re: C++ ptrmemfun break if FUNCTION_BOUNDARY < 2 * BITS_PER_UNIT
Date: Wed, 18 Apr 2001 05:48:00 -0000 [thread overview]
Message-ID: <200104181247.NAA23421@cam-mail2.cambridge.arm.com> (raw)
In-Reply-To: <orn19pu921.fsf@guarana.lsd.ic.unicamp.br>
aoliva@redhat.com said:
> I don't want to extract a bit. I want to extract the remaining bits.
> The delta was shifted left (or multiplied by 2) to make room for the
> vbit; now I want the delta back. It's a signed offset.
This is OK, provided that you can guarantee that the left shift won't
cause the "sign" bit to change value. That is
((X << 1) MOD size) >> 1 == X
for all interesting values of X.
R.
next prev parent reply other threads:[~2001-04-18 5:48 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200104062005.NAA13684@wilson.cygnus.com>
2001-04-09 8:19 ` Alexandre Oliva
2001-04-09 12:29 ` Joern Rennecke
2001-04-09 13:12 ` Alexandre Oliva
2001-04-09 13:42 ` Joern Rennecke
2001-04-18 5:48 ` Richard Earnshaw [this message]
2001-04-18 12:11 ` Alexandre Oliva
2001-04-10 9:27 ` C++ ptrmemfun break if FUNCTION_BOUNDARY < 2 *BITS_PER_UNIT Mark Mitchell
2001-04-17 10:38 ` C++ ptrmemfun break if FUNCTION_BOUNDARY < 2 * BITS_PER_UNIT Andrew Cagney
2001-04-17 13:02 ` Daniel Berlin
2001-05-16 4:53 ` Jason Merrill
2001-05-16 7:18 ` Daniel Berlin
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