libgcc: strange optimization

[Ulrich Weigand]

Richard Earnshaw wrote:

> Better still would be to change the specification and implementation of
> local register variables to only guarantee them at the beginning of ASM
> statements.  At other times they are simply the same as other local
> variables.  Now we have a problem that the register allocator knows how
> to solve.

This seems to be pretty much the same as my proposal here:
http://gcc.gnu.org/ml/gcc/2011-08/msg00064.html

But there was some push-back on requiring additional semantics
by some users ...

Bye,
Ulrich

-- 
  Dr. Ulrich Weigand
  GNU Toolchain for Linux on System z and Cell BE
  Ulrich.Weigand@de.ibm.com