On Wed, Mar 07, 2007 at 00:24:35 +0200, Sami Farin wrote:
> On Tue, Mar 06, 2007 at 23:53:49 +0200, Sami Farin wrote:
> ...
> > And I found bug in gcc-4.1.2, it gave 0 for ncubic results
> > when doing 1000 loops test... gcc-4.0.3 works.
>
> Found it.
>
> --- cbrt-test.c~ 2007-03-07 00:20:54.735248105 +0200
> +++ cbrt-test.c 2007-03-07 00:21:03.964864343 +0200
> @@ -209,7 +209,7 @@
>
> __asm__("bsrl %1,%0\n\t"
> "cmovzl %2,%0"
> - : "=&r" (r) : "rm" (x), "rm" (-1));
> + : "=&r" (r) : "rm" (x), "rm" (-1) : "memory");
> return r+1;
> }
>
> Now Linux 2.6 does not have "memory" in fls, maybe it causes
> some gcc funnies some people are seeing.
It also works without "memory" if I do "__asm__ volatile".
Why some functions have volatile and some have not in include/asm-*/*.h ?
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