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re PR tree-optimization/66726 (missed optimization, factor conversion out of COND_EXPR) 

gcc/ChangeLog:

2016-07-24  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR middle-end/66726
	* tree-ssa-reassoc.c (optimize_vec_cond_expr): Handle tcc_compare stmt
	whose result is used in PHI.
	(final_range_test_p): Likewise.
	(maybe_optimize_range_tests): Likewise.

From-SVN: r238695
This commit is contained in:
Kugan Vivekanandarajah 2016-07-24 12:47:29 +00:00 committed by Kugan Vivekanandarajah
parent bd84e5607e
commit 635c1074be
2 changed files with 88 additions and 18 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2016-07-24 Kugan Vivekanandarajah <kuganv@linaro.org>
PR middle-end/66726
* tree-ssa-reassoc.c (optimize_vec_cond_expr): Handle tcc_compare stmt
whose result is used in PHI.
(final_range_test_p): Likewise.
(maybe_optimize_range_tests): Likewise.
2016-07-22 Michael Meissner <meissner@linux.vnet.ibm.com>
* config/rs6000/rs6000-c.c (altivec_resolve_overloaded_builtin):

98
gcc/tree-ssa-reassoc.c
View File

@ -3027,18 +3027,33 @@ optimize_vec_cond_expr (tree_code opcode, vec<operand_entry *> *ops)
# _345 = PHI <_123(N), 1(...), 1(...)>
where _234 has bool type, _123 has single use and
bb N has a single successor M. This is commonly used in
the last block of a range test.
Also Return true if STMT is tcc_compare like:
<bb N>:
...
_234 = a_2(D) == 2;
<bb M>:
# _345 = PHI <_234(N), 1(...), 1(...)>
_346 = (int) _345;
where _234 has booltype, single use and
bb N has a single successor M. This is commonly used in
the last block of a range test. */
static bool
final_range_test_p (gimple *stmt)
{
basic_block bb, rhs_bb;
basic_block bb, rhs_bb, lhs_bb;
edge e;
tree lhs, rhs;
use_operand_p use_p;
gimple *use_stmt;
if (!gimple_assign_cast_p (stmt))
if (!gimple_assign_cast_p (stmt)
&& (!is_gimple_assign (stmt)
|| (TREE_CODE_CLASS (gimple_assign_rhs_code (stmt))
!= tcc_comparison)))
return false;
bb = gimple_bb (stmt);
if (!single_succ_p (bb))
@ -3049,11 +3064,16 @@ final_range_test_p (gimple *stmt)
lhs = gimple_assign_lhs (stmt);
rhs = gimple_assign_rhs1 (stmt);
if (!INTEGRAL_TYPE_P (TREE_TYPE (lhs))
|| TREE_CODE (rhs) != SSA_NAME
|| TREE_CODE (TREE_TYPE (rhs)) != BOOLEAN_TYPE)
if (gimple_assign_cast_p (stmt)
&& (!INTEGRAL_TYPE_P (TREE_TYPE (lhs))
|| TREE_CODE (rhs) != SSA_NAME
|| TREE_CODE (TREE_TYPE (rhs)) != BOOLEAN_TYPE))
return false;
if (!gimple_assign_cast_p (stmt)
&& (TREE_CODE (TREE_TYPE (lhs)) != BOOLEAN_TYPE))
return false;
/* Test whether lhs is consumed only by a PHI in the only successor bb. */
if (!single_imm_use (lhs, &use_p, &use_stmt))
return false;
@ -3063,10 +3083,20 @@ final_range_test_p (gimple *stmt)
return false;
/* And that the rhs is defined in the same loop. */
rhs_bb = gimple_bb (SSA_NAME_DEF_STMT (rhs));
if (rhs_bb == NULL
|| !flow_bb_inside_loop_p (loop_containing_stmt (stmt), rhs_bb))
return false;
if (gimple_assign_cast_p (stmt))
{
if (TREE_CODE (rhs) != SSA_NAME
|| !(rhs_bb = gimple_bb (SSA_NAME_DEF_STMT (rhs)))
|| !flow_bb_inside_loop_p (loop_containing_stmt (stmt), rhs_bb))
return false;
}
else
{
if (TREE_CODE (lhs) != SSA_NAME
|| !(lhs_bb = gimple_bb (SSA_NAME_DEF_STMT (lhs)))
|| !flow_bb_inside_loop_p (loop_containing_stmt (stmt), lhs_bb))
return false;
}
return true;
}
@ -3460,6 +3490,8 @@ maybe_optimize_range_tests (gimple *stmt)
/* stmt is
_123 = (int) _234;
OR
_234 = a_2(D) == 2;
followed by:
<bb M>:
@ -3489,6 +3521,8 @@ maybe_optimize_range_tests (gimple *stmt)
of the bitwise or resp. and, recursively. */
if (!get_ops (rhs, code, &ops,
loop_containing_stmt (stmt))
&& (TREE_CODE_CLASS (gimple_assign_rhs_code (stmt))
!= tcc_comparison)
&& has_single_use (rhs))
{
/* Otherwise, push the _234 range test itself. */
@ -3501,10 +3535,29 @@ maybe_optimize_range_tests (gimple *stmt)
oe->stmt_to_insert = NULL;
ops.safe_push (oe);
bb_ent.last_idx++;
bb_ent.op = rhs;
}
else if (is_gimple_assign (stmt)
&& (TREE_CODE_CLASS (gimple_assign_rhs_code (stmt))
== tcc_comparison)
&&!get_ops (lhs, code, &ops,
loop_containing_stmt (stmt))
&& has_single_use (lhs))
{
operand_entry *oe = operand_entry_pool.allocate ();
oe->op = lhs;
oe->rank = code;
oe->id = 0;
oe->count = 1;
ops.safe_push (oe);
bb_ent.last_idx++;
bb_ent.op = lhs;
}
else
bb_ent.last_idx = ops.length ();
bb_ent.op = rhs;
{
bb_ent.last_idx = ops.length ();
bb_ent.op = rhs;
}
bbinfo.safe_push (bb_ent);
continue;
}
@ -3586,7 +3639,7 @@ maybe_optimize_range_tests (gimple *stmt)
{
imm_use_iterator iter;
use_operand_p use_p;
gimple *use_stmt, *cast_stmt = NULL;
gimple *use_stmt, *cast_or_tcc_cmp_stmt = NULL;
FOR_EACH_IMM_USE_STMT (use_stmt, iter, bbinfo[idx].op)
if (is_gimple_debug (use_stmt))
@ -3595,17 +3648,25 @@ maybe_optimize_range_tests (gimple *stmt)
|| gimple_code (use_stmt) == GIMPLE_PHI)
FOR_EACH_IMM_USE_ON_STMT (use_p, iter)
SET_USE (use_p, new_op);
else if ((is_gimple_assign (use_stmt)
&& (TREE_CODE_CLASS
(gimple_assign_rhs_code (use_stmt))
== tcc_comparison)))
cast_or_tcc_cmp_stmt = use_stmt;
else if (gimple_assign_cast_p (use_stmt))
cast_stmt = use_stmt;
cast_or_tcc_cmp_stmt = use_stmt;
else
gcc_unreachable ();
if (cast_stmt)
if (cast_or_tcc_cmp_stmt)
{
gcc_assert (bb == last_bb);
tree lhs = gimple_assign_lhs (cast_stmt);
tree lhs = gimple_assign_lhs (cast_or_tcc_cmp_stmt);
tree new_lhs = make_ssa_name (TREE_TYPE (lhs));
enum tree_code rhs_code
= gimple_assign_rhs_code (cast_stmt);
= gimple_assign_cast_p (cast_or_tcc_cmp_stmt)
? gimple_assign_rhs_code (cast_or_tcc_cmp_stmt)
: CONVERT_EXPR;
gassign *g;
if (is_gimple_min_invariant (new_op))
{
@ -3614,8 +3675,9 @@ maybe_optimize_range_tests (gimple *stmt)
}
else
g = gimple_build_assign (new_lhs, rhs_code, new_op);
gimple_stmt_iterator gsi = gsi_for_stmt (cast_stmt);
gimple_set_uid (g, gimple_uid (cast_stmt));
gimple_stmt_iterator gsi
= gsi_for_stmt (cast_or_tcc_cmp_stmt);
gimple_set_uid (g, gimple_uid (cast_or_tcc_cmp_stmt));
gimple_set_visited (g, true);
gsi_insert_before (&gsi, g, GSI_SAME_STMT);
FOR_EACH_IMM_USE_STMT (use_stmt, iter, lhs)