re PR middle-end/37221 (Missed early loop-unroll optimization - causes 40% degradation on SPU)
2009-04-02 Richard Guenther <rguenther@suse.de> PR tree-optimization/37221 * tree-flow.h (degenerate_phi_result): Declare. * tree-ssa-dom.c (degenerate_phi_result): Export. * tree-scalar-evolution.c (analyze_initial_condition): If the initial condition is defined by a degenerate PHI node use the degenerate value. * gcc.c-torture/compile/20090331-1.c: New testcase. From-SVN: r145439
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2009-04-02 Richard Guenther <rguenther@suse.de>
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PR tree-optimization/37221
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* tree-flow.h (degenerate_phi_result): Declare.
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* tree-ssa-dom.c (degenerate_phi_result): Export.
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* tree-scalar-evolution.c (analyze_initial_condition): If
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the initial condition is defined by a degenerate PHI node
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use the degenerate value.
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2009-04-01 Eric Botcazou <ebotcazou@adacore.com>
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PR rtl-optimization/39588
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@ -1,3 +1,8 @@
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2009-04-02 Richard Guenther <rguenther@suse.de>
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PR tree-optimization/37221
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* gcc.c-torture/compile/20090331-1.c: New testcase.
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2009-04-01 Eric Botcazou <ebotcazou@adacore.com>
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* gcc.c-torture/compile/20090401-1.c: New test.
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@ -0,0 +1,26 @@
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struct re_pattern_buffer {
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unsigned char *buffer;
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unsigned long int allocated;
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};
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void byte_regex_compile (struct re_pattern_buffer *bufp,
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unsigned char *begalt, unsigned char *b)
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{
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unsigned char *pfrom;
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unsigned char *pto;
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while ((unsigned long) (b - bufp->buffer + 3) > bufp->allocated)
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{
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unsigned char *old_buffer = bufp->buffer;
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bufp->allocated <<= 1;
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if (old_buffer != bufp->buffer)
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{
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int incr = bufp->buffer - old_buffer;
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b += incr;
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}
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}
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pfrom = b;
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pto = b + 3;
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while (pfrom != begalt)
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*--pto = *--pfrom;
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}
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@ -919,6 +919,7 @@ bool simplify_stmt_using_ranges (gimple_stmt_iterator *);
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extern void dump_dominator_optimization_stats (FILE *);
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extern void debug_dominator_optimization_stats (void);
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int loop_depth_of_name (tree);
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tree degenerate_phi_result (gimple);
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/* In tree-ssa-copy.c */
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extern void merge_alias_info (tree, tree);
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@ -1577,6 +1577,20 @@ analyze_initial_condition (gimple loop_phi_node)
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if (init_cond == chrec_not_analyzed_yet)
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init_cond = chrec_dont_know;
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/* During early loop unrolling we do not have fully constant propagated IL.
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Handle degenerate PHIs here to not miss important unrollings. */
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if (TREE_CODE (init_cond) == SSA_NAME)
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{
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gimple def = SSA_NAME_DEF_STMT (init_cond);
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tree res;
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if (gimple_code (def) == GIMPLE_PHI
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&& (res = degenerate_phi_result (def)) != NULL_TREE
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/* Only allow invariants here, otherwise we may break
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loop-closed SSA form. */
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&& is_gimple_min_invariant (res))
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init_cond = res;
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}
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if (dump_file && (dump_flags & TDF_DETAILS))
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{
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fprintf (dump_file, " (init_cond = ");
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@ -2475,7 +2475,7 @@ avail_expr_eq (const void *p1, const void *p2)
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/* Given PHI, return its RHS if the PHI is a degenerate, otherwise return
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NULL. */
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static tree
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tree
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degenerate_phi_result (gimple phi)
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{
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tree lhs = gimple_phi_result (phi);
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