[Mesa-dev] [PATCH 7/8] RFC: llvmpipe: Add byte-swap construct calls

[Adhemerval Zanella]

This patch adds two more functions in type conversions header:
* lp_build_bswap: construct a call to llvm.bswap intrinsic for an
  element
* lp_build_bswap_vec: byte swap every element in a vector base on the
  input and output types.

Currently my approach for vectors is naive: it recreates a vector
by byte-swapping each element on the source vector. Right now I'm
aiming for correctness, but I plan to create a better approach by
using vector shuffles with a correct mask.

Any tips, advices, comments?

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