[Bug tree-optimization/37194] [4.3/4.4 Regression] Autovectorization of small constant iteration loop degrades performance

[irar at gcc dot gnu dot org]

------- Comment #9 from irar at gcc dot gnu dot org  2009-01-08 07:59 -------
Subject: Bug 37194

Author: irar
Date: Thu Jan  8 07:59:40 2009
New Revision: 143183

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=143183
Log:
        PR tree-optimization/37194
        * tree-vect-transform.c (vect_estimate_min_profitable_iters):
        Don't add the cost of cost model guard in prologue to scalar 
        outside cost in case of known number of iterations.


Added:
    trunk/gcc/testsuite/gcc.dg/vect/costmodel/ppc/costmodel-pr37194.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vect-transform.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37194