Hello,

here is a patch. If it is accepted, I'll extend it to other vm patterns 
(mul, div, min, max are likely candidates, but I need to check the doc). 
It passed bootstrap+testsuite on x86_64-linux.


2012-12-01  Marc Glisse  <marc.glisse@inria.fr>

 	PR target/54855
gcc/
 	* config/i386/sse.md (<sse>_vm<plusminus_insn><mode>3): Rewrite
 	pattern.
 	* config/i386/i386-builtin-types.def: New function types.
 	* config/i386/i386.c (ix86_expand_args_builtin): Likewise.
 	(bdesc_args) <__builtin_ia32_addss, __builtin_ia32_subss,
 	__builtin_ia32_addsd, __builtin_ia32_subsd>: Change prototype.
 	* config/i386/xmmintrin.h: Adapt to new builtin prototype.
 	* config/i386/emmintrin.h: Likewise.
 	* doc/extend.texi (X86 Built-in Functions): Document changed prototype.

testsuite/
 	* gcc.target/i386/pr54855-1.c: New testcase.
 	* gcc.target/i386/pr54855-2.c: New testcase.

-- 
Marc Glisse