lower subreg optimization

Joseph S. Myers joseph@codesourcery.com
Tue Apr 6 19:23:00 GMT 2010


On Tue, 6 Apr 2010, Ian Lance Taylor wrote:

> This code is sort of weird, though; why the conversion from DImode to
> DFmode?

See <http://gcc.gnu.org/ml/gcc-patches/2006-12/msg00245.html> for 
discussion of the e500 subregs and their semantics.  I made them work 
reliably (for 4.3 and later, 4.4 and later when decimal floating-point 
modes are involved) - but not necessarily efficiently in all cases.

-- 
Joseph S. Myers
joseph@codesourcery.com



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