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re PR tree-optimization/34244 (VRP/SCEV miscompiles Firefox)
2008-05-31 Richard Guenther <rguenther@suse.de>
PR tree-optimization/34244
* fold-const.c (tree_expr_nonnegative_warnv_p): Do not ask VRP.
(tree_expr_nonzero_warnv_p): Likewise.
* tree-vrp.c (vrp_expr_computes_nonnegative): Call
ssa_name_nonnegative_p.
(vrp_expr_computes_nonzero): Call ssa_name_nonzero_p.
(extract_range_from_unary_expr): Use vrp_expr_computes_nonzero,
not tree_expr_nonzero_warnv_p.
PR tree-optimization/36262
Revert
2007-11-29 Zdenek Dvorak <ook@ucw.cz>
PR tree-optimization/34244
* tree-vrp.c (adjust_range_with_scev): Clear scev cache.
(record_numbers_of_iterations): New function.
(execute_vrp): Cache the numbers of iterations of loops.
* tree-scalar-evolution.c (scev_reset_except_niters):
New function.
(scev_reset): Use scev_reset_except_niters.
* tree-scalar-evolution.h (scev_reset_except_niters): Declare.
From-SVN: r136237
This commit is contained in:
Richard Guenther
Richard Biener
parent
2643f14e44
commit
39f8a3b00c
@ -1,3 +1,27 @@
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2008-05-31 Richard Guenther <rguenther@suse.de>
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PR tree-optimization/34244
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* fold-const.c (tree_expr_nonnegative_warnv_p): Do not ask VRP.
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(tree_expr_nonzero_warnv_p): Likewise.
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* tree-vrp.c (vrp_expr_computes_nonnegative): Call
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ssa_name_nonnegative_p.
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(vrp_expr_computes_nonzero): Call ssa_name_nonzero_p.
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(extract_range_from_unary_expr): Use vrp_expr_computes_nonzero,
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not tree_expr_nonzero_warnv_p.
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PR tree-optimization/36262
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Revert
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2007-11-29 Zdenek Dvorak <ook@ucw.cz>
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PR tree-optimization/34244
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* tree-vrp.c (adjust_range_with_scev): Clear scev cache.
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(record_numbers_of_iterations): New function.
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(execute_vrp): Cache the numbers of iterations of loops.
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* tree-scalar-evolution.c (scev_reset_except_niters):
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New function.
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(scev_reset): Use scev_reset_except_niters.
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* tree-scalar-evolution.h (scev_reset_except_niters): Declare.
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2008-05-31 Bernd Schmidt <bernd.schmidt@analog.com>
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* config/bfin/bfin.h (TARGET_CPU_CPP_BUILTINS): Define
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@ -14074,11 +14074,6 @@ tree_single_nonnegative_warnv_p (tree t, bool *strict_overflow_p)
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switch (TREE_CODE (t))
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{
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case SSA_NAME:
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/* Query VRP to see if it has recorded any information about
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the range of this object. */
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return ssa_name_nonnegative_p (t);
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case INTEGER_CST:
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return tree_int_cst_sgn (t) >= 0;
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@ -14563,11 +14558,6 @@ tree_single_nonzero_warnv_p (tree t, bool *strict_overflow_p)
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bool sub_strict_overflow_p;
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switch (TREE_CODE (t))
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{
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case SSA_NAME:
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/* Query VRP to see if it has recorded any information about
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the range of this object. */
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return ssa_name_nonzero_p (t);
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case INTEGER_CST:
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return !integer_zerop (t);
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@ -2645,16 +2645,6 @@ scev_initialize (void)
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}
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}
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/* Clean the scalar evolution analysis cache, but preserve the cached
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numbers of iterations for the loops. */
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void
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scev_reset_except_niters (void)
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{
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if (scalar_evolution_info)
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htab_empty (scalar_evolution_info);
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}
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/* Cleans up the information cached by the scalar evolutions analysis. */
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void
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@ -2666,8 +2656,7 @@ scev_reset (void)
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if (!scalar_evolution_info || !current_loops)
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return;
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scev_reset_except_niters ();
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htab_empty (scalar_evolution_info);
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FOR_EACH_LOOP (li, loop, 0)
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{
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loop->nb_iterations = NULL_TREE;
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@ -27,7 +27,6 @@ extern tree get_loop_exit_condition (const struct loop *);
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extern void scev_initialize (void);
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extern void scev_reset (void);
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extern void scev_reset_except_niters (void);
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extern void scev_finalize (void);
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extern tree analyze_scalar_evolution (struct loop *, tree);
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extern tree instantiate_scev (struct loop *, struct loop *, tree);
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@ -772,7 +772,9 @@ usable_range_p (value_range_t *vr, bool *strict_overflow_p)
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static bool
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vrp_expr_computes_nonnegative (tree expr, bool *strict_overflow_p)
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{
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return tree_expr_nonnegative_warnv_p (expr, strict_overflow_p);
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return (tree_expr_nonnegative_warnv_p (expr, strict_overflow_p)
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|| (TREE_CODE (expr) == SSA_NAME
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&& ssa_name_nonnegative_p (expr)));
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}
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/* Like tree_expr_nonzero_warnv_p, but this function uses value ranges
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@ -781,7 +783,9 @@ vrp_expr_computes_nonnegative (tree expr, bool *strict_overflow_p)
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static bool
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vrp_expr_computes_nonzero (tree expr, bool *strict_overflow_p)
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{
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if (tree_expr_nonzero_warnv_p (expr, strict_overflow_p))
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if (tree_expr_nonzero_warnv_p (expr, strict_overflow_p)
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|| (TREE_CODE (expr) == SSA_NAME
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&& ssa_name_nonzero_p (expr)))
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return true;
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/* If we have an expression of the form &X->a, then the expression
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@ -2799,13 +2803,6 @@ adjust_range_with_scev (value_range_t *vr, struct loop *loop, tree stmt,
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if (vr->type == VR_ANTI_RANGE)
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return;
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/* Ensure that there are not values in the scev cache based on assumptions
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on ranges of ssa names that were changed
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(in set_value_range/set_value_range_to_varying). Preserve cached numbers
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of iterations, that were computed before the start of VRP (we do not
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recompute these each time to save the compile time). */
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scev_reset_except_niters ();
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chrec = instantiate_parameters (loop, analyze_scalar_evolution (loop, var));
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/* Like in PR19590, scev can return a constant function. */
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@ -6636,20 +6633,6 @@ vrp_finalize (void)
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vr_phi_edge_counts = NULL;
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}
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/* Calculates number of iterations for all loops, to ensure that they are
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cached. */
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static void
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record_numbers_of_iterations (void)
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{
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loop_iterator li;
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struct loop *loop;
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FOR_EACH_LOOP (li, loop, 0)
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{
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number_of_latch_executions (loop);
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}
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}
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/* Main entry point to VRP (Value Range Propagation). This pass is
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loosely based on J. R. C. Patterson, ``Accurate Static Branch
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@ -6708,17 +6691,6 @@ execute_vrp (void)
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insert_range_assertions ();
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/* Compute the # of iterations for each loop before we start the VRP
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analysis. The value ranges determined by VRP are used in expression
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simplification, that is also used by the # of iterations analysis.
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However, in the middle of the VRP analysis, the value ranges do not take
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all the possible paths in CFG into account, so they do not have to be
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correct, and the # of iterations analysis can obtain wrong results.
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This is a problem, since the results of the # of iterations analysis
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are cached, so these mistakes would not be corrected when the value
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ranges are corrected. */
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record_numbers_of_iterations ();
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to_remove_edges = VEC_alloc (edge, heap, 10);
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to_update_switch_stmts = VEC_alloc (switch_update, heap, 5);
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