Date: Fri, 17 May 2002 01:47:48 -0400 (EDT) From: John Baldwin <jhb@FreeBSD.org> To: John Baldwin <jhb@FreeBSD.org> Cc: cvs-all@FreeBSD.org, cvs-committers@FreeBSD.org Subject: RE: cvs commit: src/sys/alpha/include atomic.h Message-ID: <XFMail.20020517014748.jhb@FreeBSD.org> In-Reply-To: <200205170545.g4H5jdd33910@freefall.freebsd.org>
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On 17-May-2002 John Baldwin wrote: > jhb 2002/05/16 22:45:39 PDT > > Modified files: > sys/alpha/include atomic.h > Log: > - Apparently, the Alpha ABI mandates that arguments be passed sign-extended > regardless of if they are signed or unsigned since it is easier to work > with sign-extended values. Thus, remove the disabled zapnot to > zero-extend the sign-extended value we read from *p in atomic_cmpset_32() > since the cmpval we are comparing against should already be > sign-extended. > - To ensure that the compiler knows to sign-extend the upper 32 bits of > cmpval rather than leaving garbage in there, cast the appropriately in > the constraints section. > > Help from: Richard Henderson <rth@redhat.com> According to Richard, the fact that 2.95 zero-extended the value was a bug. Oops. :-P -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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