[patch] Replace vectorizer cost model macros with target hook

[Ira Rosen]

Hi,

This patch replaces vectorizer cost model macros with target hook.

Since the already existing builtin_vectorization_cost was not used, I
turned it to return costs for different types of statements.

struct processor_costs in config/i386/i386.c does not contain an entry for
vector permutation, so I just return 1 (default) in this case in
ix86_builtin_vectorization_cost().

Bootstrapped and tested on x86_64-suse-linux. I only cross-compiled for
SPU, so SPU testing will be appreciated.
OK to apply?

Thanks,
Ira

ChangeLog:

      * doc/tm.texi (TARGET_VECTORIZE_BUILTIN_VECTORIZATION_COST):
      Update documentation.
      * targhooks.c (default_builtin_vectorization_cost): New
      function.
      * targhooks.h (default_builtin_vectorization_cost): Declare.
      * target.h (enum vect_cost_for_stmt): Define.
      (builtin_vectorization_cost): Change argument and comment.
      * tree-vectorizer.h: Remove cost model macros.
      * tree-vect-loop.c: Include target.h.
      (vect_get_cost): New function.
      (vect_estimate_min_profitable_iters): Replace cost model
      macros with calls to vect_get_cost.
      (vect_model_reduction_cost, vect_model_induction_cost):
      Likewise.
      * target-def.h (TARGET_VECTORIZE_BUILTIN_VECTORIZATION_COST):
      Add default implementation.
      * tree-vect-stmts.c (cost_for_stmt): Replace cost model
      macros with calls to target hook builtin_vectorization_cost.
      (vect_model_simple_cost, vect_model_store_cost,
      vect_model_load_cost): Likewise.
      * Makefile.in (tree-vect-loop.o): Add dependency on
      TARGET_H.
      * config/spu/spu.c (spu_builtin_vectorization_cost): Replace
      with new implementation to return costs.
      * config/i386/i386.c (ix86_builtin_vectorization_cost):
      Likewise.
      * config/spu/spu.h: Remove vectorizer cost model macros.
      * config/i386/i386.h: Likewise.
      * tree-vect-slp.c (vect_build_slp_tree): Replace cost model
      macro with a call to target hook builtin_vectorization_cost.

(See attached file: cost-hook.txt)
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