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re PR tree-optimization/35085 (gcc.dg/vect/vect-iv-9.c fails) 

PR tree-optimization/35085
	* tree-ssa-reassoc.c (rewrite_expr_tree): Enable destructive update
	for operand entry oe2 in addition to operand entry oe3 in order to
	expose more opportunities for vectorizer sum reduction.

From-SVN: r132168
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Uros Bizjak 2008-02-07 15:11:26 +01:00 committed by Uros Bizjak
parent 0d566d211a
commit c4ae80d945
2 changed files with 19 additions and 0 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2008-02-07 Uros Bizjak <ubizjak@gmail.com>
PR tree-optimization/35085
* tree-ssa-reassoc.c (rewrite_expr_tree): Enable destructive update
for operand entry oe2 in addition to operand entry oe3 in order to
expose more opportunities for vectorizer sum reduction.
2008-02-06 Kaveh R. Ghazi <ghazi@caip.rutgers.edu>
PR other/35107

12
gcc/tree-ssa-reassoc.c
View File

@ -857,6 +857,18 @@ rewrite_expr_tree (tree stmt, unsigned int opindex,
oe1->op = temp.op;
oe1->rank= temp.rank;
}
else if ((oe1->rank == oe3->rank
&& oe2->rank != oe3->rank)
|| (is_phi_for_stmt (stmt, oe2->op)
&& !is_phi_for_stmt (stmt, oe1->op)
&& !is_phi_for_stmt (stmt, oe3->op)))
{
struct operand_entry temp = *oe2;
oe2->op = oe1->op;
oe2->rank = oe1->rank;
oe1->op = temp.op;
oe1->rank= temp.rank;
}
}
/* The final recursion case for this function is that you have