[trunk<-vta] Re: [vtab] Permit coalescing of user variables

[Alexandre Oliva]

On Jun  4, 2011, Jakub Jelinek <jakub@redhat.com> wrote:

> The following changes all look wrong to me, they make the tests totally
> useless.  If both f and g are used in real code after the asm volatile, then
> the both f and g will likely live in some register or memory.
> The whole point of the construct in the tests is that f has at that spot
> a reg or mem location, but g isn't present anywhere anymore (as the compiler
> doesn't or shouldn't know that asm volatile hasn't changed f), thus it
> should represent them as bswap/clz/ctz/rotate.

I see.  I'll try to figure out why that didn't work.  Maybe the input
operands were clobbered or something, or maybe g used to be saved
elsewhere before and now it no longer is.

-- 
Alexandre Oliva, freedom fighter    http://FSFLA.org/~lxoliva/
You must be the change you wish to see in the world. -- Gandhi
Be Free! -- http://FSFLA.org/   FSF Latin America board member
Free Software Evangelist      Red Hat Brazil Compiler Engineer