------- Additional Comments From rth at gcc dot gnu dot org 2005-01-18 11:34
-------
No, Andrew, mainline is not plainly wrong. We are correctly not using the
MMX unit when <mmintrin.h> is not in use. The instruction selection thing
can still be seen with the SSE unit though, if you widen the vectors to 16
bytes.
The problem is that ix86_rtx_costs has no idea about the cost of vector
operations. For what little it's worth, K8 thinks paddw and psllw are
equivalent -- both can be issued to fadd or fmul pipelines.
--
What |Removed |Added
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Target Milestone|--- |4.1.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14552
