Nobuhiro Iwamatsu <[EMAIL PROTECTED]> writes:
> +     __asm__ __volatile__(
> +             "tas.b  @%1\n\t"
> +             "movt   %0\n\t"
> +             "xor    #1,%0"
> +:            "=z"(_res)
> +:            "r"(lock)
> +:            "t","memory");

Another question: this asm declaration ignores the advice given at lines
89-107 of s_lock.h, both cosmetic and substantive.  Why?  Are you
entirely certain it's right, and not subject to optimization problems in
versions of gcc other than whatever you tested?

                        regards, tom lane

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