[pypy-commit] pypy vecopt: restricted input size for vectorization to 75 operations max (dont see any chance for it to succeed with more than 20-30 operations)

[plan_rich]

Author: Richard Plangger <r...@pasra.at>
Branch: vecopt
Changeset: r78383:a01f8e4831c4
Date: 2015-07-01 18:05 +0200
http://bitbucket.org/pypy/pypy/changeset/a01f8e4831c4/

Log:    restricted input size for vectorization to 75 operations max (dont
        see any chance for it to succeed with more than 20-30 operations)
        reduce resetting rval at the end of the loop

diff --git a/pypy/module/micronumpy/loop.py b/pypy/module/micronumpy/loop.py
--- a/pypy/module/micronumpy/loop.py
+++ b/pypy/module/micronumpy/loop.py
@@ -220,6 +220,7 @@
             return rval
         cur_value = func(calc_dtype, cur_value, rval)
         obj_state = obj_iter.next(obj_state)
+        rval = None
     return cur_value
 
 reduce_cum_driver = jit.JitDriver(
@@ -346,6 +347,7 @@
             temp_state = temp_iter.next(temp_state)
         else:
             temp_state = out_state
+        w_val = None
     return out
 
 
diff --git a/rpython/jit/metainterp/optimizeopt/vectorize.py 
b/rpython/jit/metainterp/optimizeopt/vectorize.py
--- a/rpython/jit/metainterp/optimizeopt/vectorize.py
+++ b/rpython/jit/metainterp/optimizeopt/vectorize.py
@@ -50,6 +50,11 @@
     optimize_unroll(metainterp_sd, jitdriver_sd, loop, optimizations,
                     inline_short_preamble, start_state, False)
     orig_ops = loop.operations
+    if len(orig_ops) >= 75:
+        # if more than 75 operations are present in this loop,
+        # it won't be possible to vectorize. There are too many
+        # guards that prevent parallel execution of instructions
+        return
     start = -1
     end = -1
     try:
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