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Re: Question about vec_extract
- From: Paolo Bonzini <paolo dot bonzini at lu dot unisi dot ch>
- To: Andrew Pinski <pinskia at gmail dot com>, GCC Development <gcc at gcc dot gnu dot org>
- Date: Wed, 12 Jul 2006 13:21:43 +0200
- Subject: Re: Question about vec_extract
- References: <de8d50360607120106t4adf5cd7o10f51158ade9776e@mail.gmail.com>
Andrew Pinski wrote:
I have been trying to figure out when the pattern vec_extract is
invoked. I understand it is invoked from extract_bit_field but I
don't see how it can be invoked. For both SSE and altivec I have
tried the following code (which I thought would cause vec_extract
pattern to be called) but on both, it is not.
Does anyone know to get vec_extract working, or is it broken in 4.0.0
and above?
I think it could never be generated -- even on 3.x.
Maybe if SRA could optimize such unions to VIEW_CONVERT_EXPR, you would
get both: a vec_extract pattern being generated, and no need to go from
V4SFmode to SFmode via TImode.
Paolo