[Xtensa] fix long long multiplication bug

[Bob Wilson]

While testing a patch for IRA, I noticed a problem in one of the tests when 
multiplying long long values with the "Multiply 32 High" Xtensa processor 
option.  The define_expand had an "early clobber" problem when the destination 
was the same as one of the inputs.  I've committed this patch to fix it.  I 
reran the testsuite for an xtensa-elf build to verify that this fixes the 
problem without introducing any regressions.

2008-08-28  Bob Wilson  <bob.wilson@acm.org>

         * config/xtensa/xtensa.md (<u>mulsidi3): Use a temporary register.
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: gcc-mul.patch
URL: <http://gcc.gnu.org/pipermail/gcc-patches/attachments/20080830/5e1377bd/attachment.ksh>