Hello,

this patch provides an alternate pattern to let combine recognize scalar 
operations that preserve the high part of a vector. If the strategy is all 
right, I could do the same for more operations (mul, div, ...). Something 
similar is also possible for V4SF (different pattern though), but probably 
not as useful.

bootstrap+testsuite ok.

2012-10-13  Marc Glisse  <marc.glisse@inria.fr>

 	PR target/54855

gcc/
 	* config/i386/sse.md (*sse2_vm<plusminus_insn>v2df3): New define_insn.

gcc/testsuite/
 	* gcc.target/i386/pr54855.c: New testcase.

-- 
Marc Glisse