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tree-ssa-pre.c (compute_avail): It's okay to have TREE_INVARIANT's here, and value number the resulting expressions.

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2005-04-14  Daniel Berlin <dberlin@dberlin.org>

	* tree-ssa-pre.c (compute_avail): It's okay to have
	TREE_INVARIANT's here, and value number the resulting expressions.
	(create_expression_by_pieces): Make sure operands that were
	min_invariant when we started, stay that way.

From-SVN: r98187
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Daniel Berlin 2005-04-15 15:39:19 +00:00 committed by Daniel Berlin
parent 7cc654b84e
commit f559447165
2 changed files with 22 additions and 4 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2005-04-14 Daniel Berlin <dberlin@dberlin.org>
* tree-ssa-pre.c (compute_avail): It's okay to have
TREE_INVARIANT's here, and value number the resulting expressions.
(create_expression_by_pieces): Make sure operands that were
min_invariant when we started, stay that way.
2005-04-15 David Edelsohn <edelsohn@gnu.org>
* doc/install.texi (*-ibm-aix*): Add comment about system limits.

19
gcc/tree-ssa-pre.c
View File

@ -950,6 +950,10 @@ phi_translate (tree expr, value_set_t set, basic_block pred,
}
}
/* For each expression in SET, translate the value handles through phi nodes
in PHIBLOCK using edge PHIBLOCK->PRED, and store the resulting
expressions in DEST. */
static void
phi_translate_set (value_set_t dest, value_set_t set, basic_block pred,
basic_block phiblock)
@ -1370,7 +1374,7 @@ create_expression_by_pieces (basic_block block, tree expr, tree stmts)
case tcc_unary:
{
tree_stmt_iterator tsi;
tree forced_stmts;
tree forced_stmts = NULL;
tree genop1;
tree temp;
tree folded;
@ -1380,7 +1384,14 @@ create_expression_by_pieces (basic_block block, tree expr, tree stmts)
add_referenced_tmp_var (temp);
folded = fold (build (TREE_CODE (expr), TREE_TYPE (expr),
genop1));
newexpr = force_gimple_operand (folded, &forced_stmts, false, NULL);
/* If the generated operand is already GIMPLE min_invariant
just use it instead of calling force_gimple_operand on it,
since that may make it not invariant by copying it into an
assignment. */
if (!is_gimple_min_invariant (genop1))
newexpr = force_gimple_operand (folded, &forced_stmts, false, NULL);
else
newexpr = genop1;
if (forced_stmts)
{
tsi = tsi_start (forced_stmts);
@ -1963,11 +1974,10 @@ compute_avail (void)
vuse_optype vuses = STMT_VUSE_OPS (stmt);
STRIP_USELESS_TYPE_CONVERSION (rhs);
if ((UNARY_CLASS_P (rhs)
if (UNARY_CLASS_P (rhs)
|| BINARY_CLASS_P (rhs)
|| COMPARISON_CLASS_P (rhs)
|| REFERENCE_CLASS_P (rhs))
&& !TREE_INVARIANT (rhs))
{
/* For binary, unary, and reference expressions,
create a duplicate expression with the operands
@ -1985,6 +1995,7 @@ compute_avail (void)
else if (TREE_CODE (rhs) == SSA_NAME
|| is_gimple_min_invariant (rhs)
|| TREE_CODE (rhs) == ADDR_EXPR
|| TREE_INVARIANT (rhs)
|| DECL_P (rhs))
{
/* Compute a value number for the RHS of the statement