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tree-scalar-evolution.c (instantiate_parameters_1, [...]): Compute the size of an expression to be instantiated and give up the... 

PR/18595
	* tree-scalar-evolution.c (instantiate_parameters_1,
	instantiate_parameters, resolve_mixers): Compute the size of an
	expression to be instantiated and give up the instantiation if the
	size exceeds PARAM_SCEV_MAX_EXPR_SIZE.

From-SVN: r106501
This commit is contained in:
Sebastian Pop 2005-11-04 20:10:04 +01:00 committed by Sebastian Pop
parent 8d66aecaff
commit 47ae9e4ca3
2 changed files with 35 additions and 20 deletions
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8
gcc/ChangeLog
View File

@ -1,3 +1,11 @@
2005-11-04 Sebastian Pop <pop@cri.ensmp.fr>
PR/18595
* tree-scalar-evolution.c (instantiate_parameters_1,
instantiate_parameters, resolve_mixers): Compute the size of an
expression to be instantiated and give up the instantiation if the
size exceeds PARAM_SCEV_MAX_EXPR_SIZE.
2005-11-04 Richard Guenther <rguenther@suse.de>
* tree-flow.h (ref_contains_indirect_ref): Rename to

47
gcc/tree-scalar-evolution.c
View File

@ -1982,7 +1982,8 @@ loop_closed_phi_def (tree var)
/* Analyze all the parameters of the chrec that were left under a symbolic form,
with respect to LOOP. CHREC is the chrec to instantiate. CACHE is the cache
of already instantiated values. FLAGS modify the way chrecs are
instantiated. */
instantiated. SIZE_EXPR is used for computing the size of the expression to
be instantiated, and to stop if it exceeds some limit. */
/* Values for FLAGS. */
enum
@ -1995,12 +1996,17 @@ enum
};
static tree
instantiate_parameters_1 (struct loop *loop, tree chrec, int flags, htab_t cache)
instantiate_parameters_1 (struct loop *loop, tree chrec, int flags, htab_t cache,
int size_expr)
{
tree res, op0, op1, op2;
basic_block def_bb;
struct loop *def_loop;
/* Give up if the expression is larger than the MAX that we allow. */
if (size_expr++ > PARAM_VALUE (PARAM_SCEV_MAX_EXPR_SIZE))
return chrec_dont_know;
if (automatically_generated_chrec_p (chrec)
|| is_gimple_min_invariant (chrec))
return chrec;
@ -2068,7 +2074,7 @@ instantiate_parameters_1 (struct loop *loop, tree chrec, int flags, htab_t cache
}
else if (res != chrec_dont_know)
res = instantiate_parameters_1 (loop, res, flags, cache);
res = instantiate_parameters_1 (loop, res, flags, cache, size_expr);
bitmap_clear_bit (already_instantiated, SSA_NAME_VERSION (chrec));
@ -2078,12 +2084,12 @@ instantiate_parameters_1 (struct loop *loop, tree chrec, int flags, htab_t cache
case POLYNOMIAL_CHREC:
op0 = instantiate_parameters_1 (loop, CHREC_LEFT (chrec),
flags, cache);
flags, cache, size_expr);
if (op0 == chrec_dont_know)
return chrec_dont_know;
op1 = instantiate_parameters_1 (loop, CHREC_RIGHT (chrec),
flags, cache);
flags, cache, size_expr);
if (op1 == chrec_dont_know)
return chrec_dont_know;
@ -2094,12 +2100,12 @@ instantiate_parameters_1 (struct loop *loop, tree chrec, int flags, htab_t cache
case PLUS_EXPR:
op0 = instantiate_parameters_1 (loop, TREE_OPERAND (chrec, 0),
flags, cache);
flags, cache, size_expr);
if (op0 == chrec_dont_know)
return chrec_dont_know;
op1 = instantiate_parameters_1 (loop, TREE_OPERAND (chrec, 1),
flags, cache);
flags, cache, size_expr);
if (op1 == chrec_dont_know)
return chrec_dont_know;
@ -2110,12 +2116,12 @@ instantiate_parameters_1 (struct loop *loop, tree chrec, int flags, htab_t cache
case MINUS_EXPR:
op0 = instantiate_parameters_1 (loop, TREE_OPERAND (chrec, 0),
flags, cache);
flags, cache, size_expr);
if (op0 == chrec_dont_know)
return chrec_dont_know;
op1 = instantiate_parameters_1 (loop, TREE_OPERAND (chrec, 1),
flags, cache);
flags, cache, size_expr);
if (op1 == chrec_dont_know)
return chrec_dont_know;
@ -2126,12 +2132,12 @@ instantiate_parameters_1 (struct loop *loop, tree chrec, int flags, htab_t cache
case MULT_EXPR:
op0 = instantiate_parameters_1 (loop, TREE_OPERAND (chrec, 0),
flags, cache);
flags, cache, size_expr);
if (op0 == chrec_dont_know)
return chrec_dont_know;
op1 = instantiate_parameters_1 (loop, TREE_OPERAND (chrec, 1),
flags, cache);
flags, cache, size_expr);
if (op1 == chrec_dont_know)
return chrec_dont_know;
@ -2144,7 +2150,7 @@ instantiate_parameters_1 (struct loop *loop, tree chrec, int flags, htab_t cache
case CONVERT_EXPR:
case NON_LVALUE_EXPR:
op0 = instantiate_parameters_1 (loop, TREE_OPERAND (chrec, 0),
flags, cache);
flags, cache, size_expr);
if (op0 == chrec_dont_know)
return chrec_dont_know;
@ -2174,17 +2180,17 @@ instantiate_parameters_1 (struct loop *loop, tree chrec, int flags, htab_t cache
{
case 3:
op0 = instantiate_parameters_1 (loop, TREE_OPERAND (chrec, 0),
flags, cache);
flags, cache, size_expr);
if (op0 == chrec_dont_know)
return chrec_dont_know;
op1 = instantiate_parameters_1 (loop, TREE_OPERAND (chrec, 1),
flags, cache);
flags, cache, size_expr);
if (op1 == chrec_dont_know)
return chrec_dont_know;
op2 = instantiate_parameters_1 (loop, TREE_OPERAND (chrec, 2),
flags, cache);
flags, cache, size_expr);
if (op2 == chrec_dont_know)
return chrec_dont_know;
@ -2198,12 +2204,12 @@ instantiate_parameters_1 (struct loop *loop, tree chrec, int flags, htab_t cache
case 2:
op0 = instantiate_parameters_1 (loop, TREE_OPERAND (chrec, 0),
flags, cache);
flags, cache, size_expr);
if (op0 == chrec_dont_know)
return chrec_dont_know;
op1 = instantiate_parameters_1 (loop, TREE_OPERAND (chrec, 1),
flags, cache);
flags, cache, size_expr);
if (op1 == chrec_dont_know)
return chrec_dont_know;
@ -2214,7 +2220,7 @@ instantiate_parameters_1 (struct loop *loop, tree chrec, int flags, htab_t cache
case 1:
op0 = instantiate_parameters_1 (loop, TREE_OPERAND (chrec, 0),
flags, cache);
flags, cache, size_expr);
if (op0 == chrec_dont_know)
return chrec_dont_know;
if (op0 == TREE_OPERAND (chrec, 0))
@ -2252,7 +2258,8 @@ instantiate_parameters (struct loop *loop,
fprintf (dump_file, ")\n");
}
res = instantiate_parameters_1 (loop, chrec, INSERT_SUPERLOOP_CHRECS, cache);
res = instantiate_parameters_1 (loop, chrec, INSERT_SUPERLOOP_CHRECS, cache,
0);
if (dump_file && (dump_flags & TDF_DETAILS))
{
@ -2275,7 +2282,7 @@ static tree
resolve_mixers (struct loop *loop, tree chrec)
{
htab_t cache = htab_create (10, hash_scev_info, eq_scev_info, del_scev_info);
tree ret = instantiate_parameters_1 (loop, chrec, FOLD_CONVERSIONS, cache);
tree ret = instantiate_parameters_1 (loop, chrec, FOLD_CONVERSIONS, cache, 0);
htab_delete (cache);
return ret;
}