procyberian/gcc
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

tree-ssa-pre.c (get_sccvn_value): Create missing VNs via vn_lookup_or_add.

Browse source 
2008-02-29  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-pre.c (get_sccvn_value): Create missing VNs via
	vn_lookup_or_add.
	* tree-ssa-sccnv.c (visit_reference_op_store): Use the rhs
	value for comparing for a store match.
	(simplify_unary_expression): Do nothing for SSA_NAMEs.
	(try_to_simplify): Do not do a full-blown reference lookup.

From-SVN: r132768
This commit is contained in:
Richard Guenther 2008-02-29 14:01:09 +00:00 • committed by Richard Biener
parent 0a5fe1104e
commit 5be891a43c
3 changed files with 22 additions and 14 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
gcc/ChangeLog
View file

@ -1,3 +1,12 @@
2008-02-29 Richard Guenther <rguenther@suse.de>
* tree-ssa-pre.c (get_sccvn_value): Create missing VNs via
vn_lookup_or_add.
* tree-ssa-sccnv.c (visit_reference_op_store): Use the rhs
value for comparing for a store match.
(simplify_unary_expression): Do nothing for SSA_NAMEs.
(try_to_simplify): Do not do a full-blown reference lookup.
2008-02-29 Kaz Kojima <kkojima@gcc.gnu.org>
* config/sh/sh.c (sh_scalar_mode_supported_p): New function.

4
gcc/tree-ssa-pre.c
View file

@ -3256,7 +3256,9 @@ get_sccvn_value (tree name)
!ZERO_SSA_OPERANDS (defstmt2, SSA_OP_ALL_VIRTUALS))
gcc_assert (defstmt);
}
valvh = vn_lookup_or_add_with_stmt (val, defstmt);
/* We lookup with the LHS, so do not use vn_lookup_or_add_with_stmt
here, as that will result in useless reference lookups. */
valvh = vn_lookup_or_add (val);
}
if (dump_file && (dump_flags & TDF_DETAILS))

23
gcc/tree-ssa-sccvn.c
View file

@ -1231,6 +1231,8 @@ visit_reference_op_store (tree lhs, tree op, tree stmt)
{
if (TREE_CODE (result) == SSA_NAME)
result = SSA_VAL (result);
if (TREE_CODE (op) == SSA_NAME)
op = SSA_VAL (op);
resultsame = expressions_equal_p (result, op);
}
@ -1527,13 +1529,10 @@ simplify_unary_expression (tree rhs)
static tree
try_to_simplify (tree stmt, tree rhs)
{
/* For stores we can end up simplifying a SSA_NAME rhs. Just return
in this case, there is no point in doing extra work. */
if (TREE_CODE (rhs) == SSA_NAME)
{
if (is_gimple_min_invariant (SSA_VAL (rhs)))
return SSA_VAL (rhs);
else if (VN_INFO (rhs)->has_constants)
return VN_INFO (rhs)->expr;
}
return rhs;
else
{
switch (TREE_CODE_CLASS (TREE_CODE (rhs)))
@ -1550,13 +1549,11 @@ try_to_simplify (tree stmt, tree rhs)
/* Fallthrough. */
case tcc_reference:
{
tree result = vn_reference_lookup (rhs,
shared_vuses_from_stmt (stmt));
if (result)
return result;
}
/* Fallthrough for some codes. */
/* Do not do full-blown reference lookup here.
??? But like for tcc_declaration, we should simplify
from constant initializers. */
/* Fallthrough for some codes that can operate on registers. */
if (!(TREE_CODE (rhs) == REALPART_EXPR
|| TREE_CODE (rhs) == IMAGPART_EXPR))
break;