[autovect] [patch] more cleanups

[Dorit Naishlos <DORIT at il dot ibm dot com>]

When a pattern is detected  during pattern recognition in the vectorizer,
we mark all the stmts that constitute the pattern (i.e. - set the
STMT_VINFO_IN_APTTERN_P and STMT_VINFO_RELATED_STMT fields for all these
stmts). Turns out this is redundant - nowhere else in the vectorizer do we
look at these fields, except for the last stmt in the pattern - this is the
only stmt that needs to be marked.
This patch cleans away the redundant bookkeeping.

Bootstrapped with vectorization enabled on powerpc-linux, tested on the
vectorizer testcases. Committed to autovect-branch.

Changelog:

        * tree-vectorizer.h (vect_recog_unsigned_subsat_pattern):
        (vect_recog_widen_sum_pattern, vect_recog_widen_mult_pattern):
        (vect_recog_mult_hi_pattern, vect_recog_sad_pattern):
        (vect_recog_dot_prod_pattern, _recog_func_ptr): Last argument
removed.
        * tree-vect-analyze.c (vect_recog_unsigned_subsat_pattern):
        (vect_recog_widen_sum_pattern, vect_recog_widen_mult_pattern):
        (vect_recog_mult_hi_pattern, vect_recog_sad_pattern):
        (vect_recog_dot_prod_pattern): Last argument (stmt_list) removed.
        Documentation updated accordingly. STMT_VINFO_IN_PATTERN_P checks
        removed.
        (vect_pattern_recog_1): Update declaration of pattern_recog_func.
        stmt_list removed. Set STMT_VINFO_RELATED_STMT and
        STMT_VINFO_IN_PATTERN_P only for 'stmt'.
        (vect_pattern_recog): Update documentation. Update declaration of
        pattern_recog_func.

Patch:

(See attached file: cleanup.autovect.dec24)

Attachment: cleanup.autovect.dec24
Description: Binary data