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tree-ssa-ccp.c (visit_assignment): Verify that result of VIEW_CONVERT_EXPR is_gimple_min_invariant.

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* tree-ssa-ccp.c (visit_assignment): Verify that result of
	VIEW_CONVERT_EXPR is_gimple_min_invariant.

From-SVN: r95510
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Richard Kenner 2005-02-24 18:58:04 +00:00 committed by Richard Kenner
parent ab9b9d2cf3
commit ae95537a89
2 changed files with 15 additions and 6 deletions
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3
gcc/ChangeLog
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@ -1,5 +1,8 @@
2005-02-24 Richard Kenner <kenner@vlsi1.ultra.nyu.edu>
* tree-ssa-ccp.c (visit_assignment): Verify that result of
VIEW_CONVERT_EXPR is_gimple_min_invariant.
* print-tree.c (print_node_brief): Print LABEL_DECL_UID.
(print_node): Likewise.
Print TYPE_SIZES_GIMPLIFIED.

18
gcc/tree-ssa-ccp.c
View File

@ -1060,9 +1060,7 @@ visit_assignment (tree stmt, tree *output_p)
val = evaluate_stmt (stmt);
/* If the original LHS was a VIEW_CONVERT_EXPR, modify the constant
value to be a VIEW_CONVERT_EXPR of the old constant value. This is
valid because a VIEW_CONVERT_EXPR is valid everywhere an operand of
aggregate type is valid.
value to be a VIEW_CONVERT_EXPR of the old constant value.
??? Also, if this was a definition of a bitfield, we need to widen
the constant value into the type of the destination variable. This
@ -1073,10 +1071,18 @@ visit_assignment (tree stmt, tree *output_p)
if (TREE_CODE (orig_lhs) == VIEW_CONVERT_EXPR
&& val.lattice_val == CONSTANT)
{
val.const_val = build1 (VIEW_CONVERT_EXPR,
TREE_TYPE (TREE_OPERAND (orig_lhs, 0)),
val.const_val);
tree w = fold (build1 (VIEW_CONVERT_EXPR,
TREE_TYPE (TREE_OPERAND (orig_lhs, 0)),
val.const_val));
orig_lhs = TREE_OPERAND (orig_lhs, 1);
if (w && is_gimple_min_invariant (w))
val.const_val = w;
else
{
val.lattice_val = VARYING;
val.const_val = NULL;
}
}
if (val.lattice_val == CONSTANT