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tree-complex.c (init_dont_simulate_again): Clear DONT_SIMULATE_AGAIN for control-altering statements; set it again for returns.

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* tree-complex.c (init_dont_simulate_again): Clear DONT_SIMULATE_AGAIN
        for control-altering statements; set it again for returns.
        (complex_visit_stmt): Return SSA_PROP_VARYING for stmts that are
        not MODIFY_EXPR.

From-SVN: r101178
This commit is contained in:
Richard Henderson 2005-06-18 23:35:52 -07:00 committed by Richard Henderson
parent aad97b9bdd
commit 99e6bdda90
2 changed files with 20 additions and 6 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2005-06-18 Richard Henderson <rth@redhat.com>
* tree-complex.c (init_dont_simulate_again): Clear DONT_SIMULATE_AGAIN
for control-altering statements; set it again for returns.
(complex_visit_stmt): Return SSA_PROP_VARYING for stmts that are
not MODIFY_EXPR.
2005-06-18 Richard Henderson <rth@redhat.com> 2005-06-18 Richard Henderson <rth@redhat.com>
PR tree-opt/22116 PR tree-opt/22116

19
gcc/tree-complex.c
View File

@ -160,12 +160,20 @@ init_dont_simulate_again (void)
for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi)) for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
{ {
tree orig_stmt, stmt, rhs = NULL; tree orig_stmt, stmt, rhs = NULL;
bool dsa = true; bool dsa;
orig_stmt = stmt = bsi_stmt (bsi); orig_stmt = stmt = bsi_stmt (bsi);
/* Most control-altering statements must be initially
simulated, else we won't cover the entire cfg. */
dsa = !stmt_ends_bb_p (stmt);
switch (TREE_CODE (stmt)) switch (TREE_CODE (stmt))
{ {
case RETURN_EXPR: case RETURN_EXPR:
/* We don't care what the lattice value of <retval> is,
since it's never used as an input to another computation. */
dsa = true;
stmt = TREE_OPERAND (stmt, 0); stmt = TREE_OPERAND (stmt, 0);
if (!stmt || TREE_CODE (stmt) != MODIFY_EXPR) if (!stmt || TREE_CODE (stmt) != MODIFY_EXPR)
break; break;
@ -228,15 +236,14 @@ complex_visit_stmt (tree stmt, edge *taken_edge_p ATTRIBUTE_UNUSED,
unsigned int ver; unsigned int ver;
tree lhs, rhs; tree lhs, rhs;
/* These conditions should be satisfied due to the initial filter if (TREE_CODE (stmt) != MODIFY_EXPR)
set up in init_dont_simulate_again. */ return SSA_PROP_VARYING;
if (TREE_CODE (stmt) == RETURN_EXPR)
stmt = TREE_OPERAND (stmt, 0);
gcc_assert (TREE_CODE (stmt) == MODIFY_EXPR);
lhs = TREE_OPERAND (stmt, 0); lhs = TREE_OPERAND (stmt, 0);
rhs = TREE_OPERAND (stmt, 1); rhs = TREE_OPERAND (stmt, 1);
/* These conditions should be satisfied due to the initial filter
set up in init_dont_simulate_again. */
gcc_assert (TREE_CODE (lhs) == SSA_NAME); gcc_assert (TREE_CODE (lhs) == SSA_NAME);
gcc_assert (TREE_CODE (TREE_TYPE (lhs)) == COMPLEX_TYPE); gcc_assert (TREE_CODE (TREE_TYPE (lhs)) == COMPLEX_TYPE);