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Force block enders to be simulated once.

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From-SVN: r151273
This commit is contained in:
Richard Henderson 2009-09-01 07:37:52 -07:00 • committed by Richard Henderson
parent fd58da50fd
commit cd6ea7a2df
3 changed files with 26 additions and 6 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2009-09-01 Richard Henderson <rth@redhat.com>
* tree-ssa-ccp.c (ccp_initialize): Make sure to simulate
stmt_ends_pp_p statements at least once.
* tree-vrp.c (vrp_initialize): Likewise.
(vrp_visit_stmt): Be prepared for non-interesting stmts.
2009-09-01 Dodji Seketeli <dodji@redhat.com>
PR bootstrap/41205

10
gcc/tree-ssa-ccp.c
View file

@ -650,7 +650,15 @@ ccp_initialize (void)
for (i = gsi_start_bb (bb); !gsi_end_p (i); gsi_next (&i))
{
gimple stmt = gsi_stmt (i);
bool is_varying = surely_varying_stmt_p (stmt);
bool is_varying;
/* If the statement is a control insn, then we do not
want to avoid simulating the statement once. Failure
to do so means that those edges will never get added. */
if (stmt_ends_bb_p (stmt))
is_varying = false;
else
is_varying = surely_varying_stmt_p (stmt);
if (is_varying)
{

15
gcc/tree-vrp.c
View file

@ -5317,7 +5317,12 @@ vrp_initialize (void)
{
gimple stmt = gsi_stmt (si);
if (!stmt_interesting_for_vrp (stmt))
/* If the statement is a control insn, then we do not
want to avoid simulating the statement once. Failure
to do so means that those edges will never get added. */
if (stmt_ends_bb_p (stmt))
prop_set_simulate_again (stmt, true);
else if (!stmt_interesting_for_vrp (stmt))
{
ssa_op_iter i;
tree def;
@ -5326,9 +5331,7 @@ vrp_initialize (void)
prop_set_simulate_again (stmt, false);
}
else
{
prop_set_simulate_again (stmt, true);
}
prop_set_simulate_again (stmt, true);
}
}
}
@ -6087,7 +6090,9 @@ vrp_visit_stmt (gimple stmt, edge *taken_edge_p, tree *output_p)
fprintf (dump_file, "\n");
}
if (is_gimple_assign (stmt) || is_gimple_call (stmt))
if (!stmt_interesting_for_vrp (stmt))
gcc_assert (stmt_ends_bb_p (stmt));
else if (is_gimple_assign (stmt) || is_gimple_call (stmt))
{
/* In general, assignments with virtual operands are not useful
for deriving ranges, with the obvious exception of calls to