SRA bit-field optimization

[Alexandre Oliva]

On Oct  3, 2007, Richard Sandiford <rsandifo@nildram.co.uk> wrote:

> For the record, it also causes many failures on mips-linux-gnu,
> such as the following execute.exp ones:

> FWIW, the gcc.c-torture/execute/20000113-1.c failures can easily be
> reproduced with a cross-compiler, because after the patch, foobar is
> optimised to a call to abort.

This patch appears to fix at least the first one.  I haven't given it
a full round of testing yet, FWIW.

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-- 
Alexandre Oliva         http://www.lsd.ic.unicamp.br/~oliva/
FSF Latin America Board Member         http://www.fsfla.org/
Red Hat Compiler Engineer   aoliva@{redhat.com, gcc.gnu.org}
Free Software Evangelist  oliva@{lsd.ic.unicamp.br, gnu.org}