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Hi, This patch enhances vectorizer with support of loops with unaligned stores. Both cases are handled: a store which alignment is unknown in compile time and a store with known unalignment. The patch is base on loop transformation introduced in vectorizer patch #2 (http://gcc.gnu.org/ml/gcc-patches/2004-09/msg01104.html, hopefully to be reviewed!) Tested on powerpc-apple-darwin7.0.0. All vectorizer test pass. Testcases 26 and 28 are changed from xfail to pass; additional two loops are vectorized in testcase 31. The diff includes also vectorizer patch #2, while ChangeLog is only for this patch. thanks, olga ChengeLog: * tree-vectorizer.c (vect_get_loop_niters): (vect_gen_niters_for_prolog_loop): (vect_update_niters_after_peeling): (vect_update_inits_of_dr): (vect_update_inits_of_drs): (vect_do_peeling_for_alignment): New functions. (vect_transform_loop): Added unalignment support. (vect_analyze_data_refs_alignment): Allowed one unaligned store. * tree-vectorizer.h (MAX_NUMBER_OF_UNALIGNED_DATA_REFS): New define. (do_peeling_for_alignment): (unaligned_drs): New members of _loop_vec_info. (LOOP_DO_PEELING_FOR_ALIGNMENT): New macro. (See attached file: peeling_main1.txt)
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peeling_main1.txt
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