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tree-complex.c
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tree-complex.c
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/* Lower complex number operations to scalar operations.
Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010
Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3, or (at your option) any
later version.
GCC is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "tree.h"
#include "flags.h"
#include "tree-flow.h"
#include "gimple.h"
#include "tree-iterator.h"
#include "tree-pass.h"
#include "tree-ssa-propagate.h"
/* For each complex ssa name, a lattice value. We're interested in finding
out whether a complex number is degenerate in some way, having only real
or only complex parts. */
enum
{
UNINITIALIZED = 0,
ONLY_REAL = 1,
ONLY_IMAG = 2,
VARYING = 3
};
/* The type complex_lattice_t holds combinations of the above
constants. */
typedef int complex_lattice_t;
#define PAIR(a, b) ((a) << 2 | (b))
DEF_VEC_I(complex_lattice_t);
DEF_VEC_ALLOC_I(complex_lattice_t, heap);
static VEC(complex_lattice_t, heap) *complex_lattice_values;
/* For each complex variable, a pair of variables for the components exists in
the hashtable. */
static htab_t complex_variable_components;
/* For each complex SSA_NAME, a pair of ssa names for the components. */
static VEC(tree, heap) *complex_ssa_name_components;
/* Lookup UID in the complex_variable_components hashtable and return the
associated tree. */
static tree
cvc_lookup (unsigned int uid)
{
struct int_tree_map *h, in;
in.uid = uid;
h = (struct int_tree_map *) htab_find_with_hash (complex_variable_components, &in, uid);
return h ? h->to : NULL;
}
/* Insert the pair UID, TO into the complex_variable_components hashtable. */
static void
cvc_insert (unsigned int uid, tree to)
{
struct int_tree_map *h;
void **loc;
h = XNEW (struct int_tree_map);
h->uid = uid;
h->to = to;
loc = htab_find_slot_with_hash (complex_variable_components, h,
uid, INSERT);
*(struct int_tree_map **) loc = h;
}
/* Return true if T is not a zero constant. In the case of real values,
we're only interested in +0.0. */
static int
some_nonzerop (tree t)
{
int zerop = false;
/* Operations with real or imaginary part of a complex number zero
cannot be treated the same as operations with a real or imaginary
operand if we care about the signs of zeros in the result. */
if (TREE_CODE (t) == REAL_CST && !flag_signed_zeros)
zerop = REAL_VALUES_IDENTICAL (TREE_REAL_CST (t), dconst0);
else if (TREE_CODE (t) == FIXED_CST)
zerop = fixed_zerop (t);
else if (TREE_CODE (t) == INTEGER_CST)
zerop = integer_zerop (t);
return !zerop;
}
/* Compute a lattice value from the components of a complex type REAL
and IMAG. */
static complex_lattice_t
find_lattice_value_parts (tree real, tree imag)
{
int r, i;
complex_lattice_t ret;
r = some_nonzerop (real);
i = some_nonzerop (imag);
ret = r * ONLY_REAL + i * ONLY_IMAG;
/* ??? On occasion we could do better than mapping 0+0i to real, but we
certainly don't want to leave it UNINITIALIZED, which eventually gets
mapped to VARYING. */
if (ret == UNINITIALIZED)
ret = ONLY_REAL;
return ret;
}
/* Compute a lattice value from gimple_val T. */
static complex_lattice_t
find_lattice_value (tree t)
{
tree real, imag;
switch (TREE_CODE (t))
{
case SSA_NAME:
return VEC_index (complex_lattice_t, complex_lattice_values,
SSA_NAME_VERSION (t));
case COMPLEX_CST:
real = TREE_REALPART (t);
imag = TREE_IMAGPART (t);
break;
default:
gcc_unreachable ();
}
return find_lattice_value_parts (real, imag);
}
/* Determine if LHS is something for which we're interested in seeing
simulation results. */
static bool
is_complex_reg (tree lhs)
{
return TREE_CODE (TREE_TYPE (lhs)) == COMPLEX_TYPE && is_gimple_reg (lhs);
}
/* Mark the incoming parameters to the function as VARYING. */
static void
init_parameter_lattice_values (void)
{
tree parm, ssa_name;
for (parm = DECL_ARGUMENTS (cfun->decl); parm ; parm = DECL_CHAIN (parm))
if (is_complex_reg (parm)
&& var_ann (parm) != NULL
&& (ssa_name = gimple_default_def (cfun, parm)) != NULL_TREE)
VEC_replace (complex_lattice_t, complex_lattice_values,
SSA_NAME_VERSION (ssa_name), VARYING);
}
/* Initialize simulation state for each statement. Return false if we
found no statements we want to simulate, and thus there's nothing
for the entire pass to do. */
static bool
init_dont_simulate_again (void)
{
basic_block bb;
gimple_stmt_iterator gsi;
gimple phi;
bool saw_a_complex_op = false;
FOR_EACH_BB (bb)
{
for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi))
{
phi = gsi_stmt (gsi);
prop_set_simulate_again (phi,
is_complex_reg (gimple_phi_result (phi)));
}
for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
{
gimple stmt;
tree op0, op1;
bool sim_again_p;
stmt = gsi_stmt (gsi);
op0 = op1 = NULL_TREE;
/* Most control-altering statements must be initially
simulated, else we won't cover the entire cfg. */
sim_again_p = stmt_ends_bb_p (stmt);
switch (gimple_code (stmt))
{
case GIMPLE_CALL:
if (gimple_call_lhs (stmt))
sim_again_p = is_complex_reg (gimple_call_lhs (stmt));
break;
case GIMPLE_ASSIGN:
sim_again_p = is_complex_reg (gimple_assign_lhs (stmt));
if (gimple_assign_rhs_code (stmt) == REALPART_EXPR
|| gimple_assign_rhs_code (stmt) == IMAGPART_EXPR)
op0 = TREE_OPERAND (gimple_assign_rhs1 (stmt), 0);
else
op0 = gimple_assign_rhs1 (stmt);
if (gimple_num_ops (stmt) > 2)
op1 = gimple_assign_rhs2 (stmt);
break;
case GIMPLE_COND:
op0 = gimple_cond_lhs (stmt);
op1 = gimple_cond_rhs (stmt);
break;
default:
break;
}
if (op0 || op1)
switch (gimple_expr_code (stmt))
{
case EQ_EXPR:
case NE_EXPR:
case PLUS_EXPR:
case MINUS_EXPR:
case MULT_EXPR:
case TRUNC_DIV_EXPR:
case CEIL_DIV_EXPR:
case FLOOR_DIV_EXPR:
case ROUND_DIV_EXPR:
case RDIV_EXPR:
if (TREE_CODE (TREE_TYPE (op0)) == COMPLEX_TYPE
|| TREE_CODE (TREE_TYPE (op1)) == COMPLEX_TYPE)
saw_a_complex_op = true;
break;
case NEGATE_EXPR:
case CONJ_EXPR:
if (TREE_CODE (TREE_TYPE (op0)) == COMPLEX_TYPE)
saw_a_complex_op = true;
break;
case REALPART_EXPR:
case IMAGPART_EXPR:
/* The total store transformation performed during
gimplification creates such uninitialized loads
and we need to lower the statement to be able
to fix things up. */
if (TREE_CODE (op0) == SSA_NAME
&& ssa_undefined_value_p (op0))
saw_a_complex_op = true;
break;
default:
break;
}
prop_set_simulate_again (stmt, sim_again_p);
}
}
return saw_a_complex_op;
}
/* Evaluate statement STMT against the complex lattice defined above. */
static enum ssa_prop_result
complex_visit_stmt (gimple stmt, edge *taken_edge_p ATTRIBUTE_UNUSED,
tree *result_p)
{
complex_lattice_t new_l, old_l, op1_l, op2_l;
unsigned int ver;
tree lhs;
lhs = gimple_get_lhs (stmt);
/* Skip anything but GIMPLE_ASSIGN and GIMPLE_CALL with a lhs. */
if (!lhs)
return SSA_PROP_VARYING;
/* 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 (TREE_TYPE (lhs)) == COMPLEX_TYPE);
*result_p = lhs;
ver = SSA_NAME_VERSION (lhs);
old_l = VEC_index (complex_lattice_t, complex_lattice_values, ver);
switch (gimple_expr_code (stmt))
{
case SSA_NAME:
case COMPLEX_CST:
new_l = find_lattice_value (gimple_assign_rhs1 (stmt));
break;
case COMPLEX_EXPR:
new_l = find_lattice_value_parts (gimple_assign_rhs1 (stmt),
gimple_assign_rhs2 (stmt));
break;
case PLUS_EXPR:
case MINUS_EXPR:
op1_l = find_lattice_value (gimple_assign_rhs1 (stmt));
op2_l = find_lattice_value (gimple_assign_rhs2 (stmt));
/* We've set up the lattice values such that IOR neatly
models addition. */
new_l = op1_l | op2_l;
break;
case MULT_EXPR:
case RDIV_EXPR:
case TRUNC_DIV_EXPR:
case CEIL_DIV_EXPR:
case FLOOR_DIV_EXPR:
case ROUND_DIV_EXPR:
op1_l = find_lattice_value (gimple_assign_rhs1 (stmt));
op2_l = find_lattice_value (gimple_assign_rhs2 (stmt));
/* Obviously, if either varies, so does the result. */
if (op1_l == VARYING || op2_l == VARYING)
new_l = VARYING;
/* Don't prematurely promote variables if we've not yet seen
their inputs. */
else if (op1_l == UNINITIALIZED)
new_l = op2_l;
else if (op2_l == UNINITIALIZED)
new_l = op1_l;
else
{
/* At this point both numbers have only one component. If the
numbers are of opposite kind, the result is imaginary,
otherwise the result is real. The add/subtract translates
the real/imag from/to 0/1; the ^ performs the comparison. */
new_l = ((op1_l - ONLY_REAL) ^ (op2_l - ONLY_REAL)) + ONLY_REAL;
/* Don't allow the lattice value to flip-flop indefinitely. */
new_l |= old_l;
}
break;
case NEGATE_EXPR:
case CONJ_EXPR:
new_l = find_lattice_value (gimple_assign_rhs1 (stmt));
break;
default:
new_l = VARYING;
break;
}
/* If nothing changed this round, let the propagator know. */
if (new_l == old_l)
return SSA_PROP_NOT_INTERESTING;
VEC_replace (complex_lattice_t, complex_lattice_values, ver, new_l);
return new_l == VARYING ? SSA_PROP_VARYING : SSA_PROP_INTERESTING;
}
/* Evaluate a PHI node against the complex lattice defined above. */
static enum ssa_prop_result
complex_visit_phi (gimple phi)
{
complex_lattice_t new_l, old_l;
unsigned int ver;
tree lhs;
int i;
lhs = gimple_phi_result (phi);
/* This condition should be satisfied due to the initial filter
set up in init_dont_simulate_again. */
gcc_assert (TREE_CODE (TREE_TYPE (lhs)) == COMPLEX_TYPE);
/* We've set up the lattice values such that IOR neatly models PHI meet. */
new_l = UNINITIALIZED;
for (i = gimple_phi_num_args (phi) - 1; i >= 0; --i)
new_l |= find_lattice_value (gimple_phi_arg_def (phi, i));
ver = SSA_NAME_VERSION (lhs);
old_l = VEC_index (complex_lattice_t, complex_lattice_values, ver);
if (new_l == old_l)
return SSA_PROP_NOT_INTERESTING;
VEC_replace (complex_lattice_t, complex_lattice_values, ver, new_l);
return new_l == VARYING ? SSA_PROP_VARYING : SSA_PROP_INTERESTING;
}
/* Create one backing variable for a complex component of ORIG. */
static tree
create_one_component_var (tree type, tree orig, const char *prefix,
const char *suffix, enum tree_code code)
{
tree r = create_tmp_var (type, prefix);
add_referenced_var (r);
DECL_SOURCE_LOCATION (r) = DECL_SOURCE_LOCATION (orig);
DECL_ARTIFICIAL (r) = 1;
if (DECL_NAME (orig) && !DECL_IGNORED_P (orig))
{
const char *name = IDENTIFIER_POINTER (DECL_NAME (orig));
DECL_NAME (r) = get_identifier (ACONCAT ((name, suffix, NULL)));
SET_DECL_DEBUG_EXPR (r, build1 (code, type, orig));
DECL_DEBUG_EXPR_IS_FROM (r) = 1;
DECL_IGNORED_P (r) = 0;
TREE_NO_WARNING (r) = TREE_NO_WARNING (orig);
}
else
{
DECL_IGNORED_P (r) = 1;
TREE_NO_WARNING (r) = 1;
}
return r;
}
/* Retrieve a value for a complex component of VAR. */
static tree
get_component_var (tree var, bool imag_p)
{
size_t decl_index = DECL_UID (var) * 2 + imag_p;
tree ret = cvc_lookup (decl_index);
if (ret == NULL)
{
ret = create_one_component_var (TREE_TYPE (TREE_TYPE (var)), var,
imag_p ? "CI" : "CR",
imag_p ? "$imag" : "$real",
imag_p ? IMAGPART_EXPR : REALPART_EXPR);
cvc_insert (decl_index, ret);
}
return ret;
}
/* Retrieve a value for a complex component of SSA_NAME. */
static tree
get_component_ssa_name (tree ssa_name, bool imag_p)
{
complex_lattice_t lattice = find_lattice_value (ssa_name);
size_t ssa_name_index;
tree ret;
if (lattice == (imag_p ? ONLY_REAL : ONLY_IMAG))
{
tree inner_type = TREE_TYPE (TREE_TYPE (ssa_name));
if (SCALAR_FLOAT_TYPE_P (inner_type))
return build_real (inner_type, dconst0);
else
return build_int_cst (inner_type, 0);
}
ssa_name_index = SSA_NAME_VERSION (ssa_name) * 2 + imag_p;
ret = VEC_index (tree, complex_ssa_name_components, ssa_name_index);
if (ret == NULL)
{
ret = get_component_var (SSA_NAME_VAR (ssa_name), imag_p);
ret = make_ssa_name (ret, NULL);
/* Copy some properties from the original. In particular, whether it
is used in an abnormal phi, and whether it's uninitialized. */
SSA_NAME_OCCURS_IN_ABNORMAL_PHI (ret)
= SSA_NAME_OCCURS_IN_ABNORMAL_PHI (ssa_name);
if (TREE_CODE (SSA_NAME_VAR (ssa_name)) == VAR_DECL
&& gimple_nop_p (SSA_NAME_DEF_STMT (ssa_name)))
{
SSA_NAME_DEF_STMT (ret) = SSA_NAME_DEF_STMT (ssa_name);
set_default_def (SSA_NAME_VAR (ret), ret);
}
VEC_replace (tree, complex_ssa_name_components, ssa_name_index, ret);
}
return ret;
}
/* Set a value for a complex component of SSA_NAME, return a
gimple_seq of stuff that needs doing. */
static gimple_seq
set_component_ssa_name (tree ssa_name, bool imag_p, tree value)
{
complex_lattice_t lattice = find_lattice_value (ssa_name);
size_t ssa_name_index;
tree comp;
gimple last;
gimple_seq list;
/* We know the value must be zero, else there's a bug in our lattice
analysis. But the value may well be a variable known to contain
zero. We should be safe ignoring it. */
if (lattice == (imag_p ? ONLY_REAL : ONLY_IMAG))
return NULL;
/* If we've already assigned an SSA_NAME to this component, then this
means that our walk of the basic blocks found a use before the set.
This is fine. Now we should create an initialization for the value
we created earlier. */
ssa_name_index = SSA_NAME_VERSION (ssa_name) * 2 + imag_p;
comp = VEC_index (tree, complex_ssa_name_components, ssa_name_index);
if (comp)
;
/* If we've nothing assigned, and the value we're given is already stable,
then install that as the value for this SSA_NAME. This preemptively
copy-propagates the value, which avoids unnecessary memory allocation. */
else if (is_gimple_min_invariant (value)
&& !SSA_NAME_OCCURS_IN_ABNORMAL_PHI (ssa_name))
{
VEC_replace (tree, complex_ssa_name_components, ssa_name_index, value);
return NULL;
}
else if (TREE_CODE (value) == SSA_NAME
&& !SSA_NAME_OCCURS_IN_ABNORMAL_PHI (ssa_name))
{
/* Replace an anonymous base value with the variable from cvc_lookup.
This should result in better debug info. */
if (DECL_IGNORED_P (SSA_NAME_VAR (value))
&& !DECL_IGNORED_P (SSA_NAME_VAR (ssa_name)))
{
comp = get_component_var (SSA_NAME_VAR (ssa_name), imag_p);
replace_ssa_name_symbol (value, comp);
}
VEC_replace (tree, complex_ssa_name_components, ssa_name_index, value);
return NULL;
}
/* Finally, we need to stabilize the result by installing the value into
a new ssa name. */
else
comp = get_component_ssa_name (ssa_name, imag_p);
/* Do all the work to assign VALUE to COMP. */
list = NULL;
value = force_gimple_operand (value, &list, false, NULL);
last = gimple_build_assign (comp, value);
gimple_seq_add_stmt (&list, last);
gcc_assert (SSA_NAME_DEF_STMT (comp) == last);
return list;
}
/* Extract the real or imaginary part of a complex variable or constant.
Make sure that it's a proper gimple_val and gimplify it if not.
Emit any new code before gsi. */
static tree
extract_component (gimple_stmt_iterator *gsi, tree t, bool imagpart_p,
bool gimple_p)
{
switch (TREE_CODE (t))
{
case COMPLEX_CST:
return imagpart_p ? TREE_IMAGPART (t) : TREE_REALPART (t);
case COMPLEX_EXPR:
gcc_unreachable ();
case VAR_DECL:
case RESULT_DECL:
case PARM_DECL:
case COMPONENT_REF:
case ARRAY_REF:
case VIEW_CONVERT_EXPR:
case MEM_REF:
{
tree inner_type = TREE_TYPE (TREE_TYPE (t));
t = build1 ((imagpart_p ? IMAGPART_EXPR : REALPART_EXPR),
inner_type, unshare_expr (t));
if (gimple_p)
t = force_gimple_operand_gsi (gsi, t, true, NULL, true,
GSI_SAME_STMT);
return t;
}
case SSA_NAME:
return get_component_ssa_name (t, imagpart_p);
default:
gcc_unreachable ();
}
}
/* Update the complex components of the ssa name on the lhs of STMT. */
static void
update_complex_components (gimple_stmt_iterator *gsi, gimple stmt, tree r,
tree i)
{
tree lhs;
gimple_seq list;
lhs = gimple_get_lhs (stmt);
list = set_component_ssa_name (lhs, false, r);
if (list)
gsi_insert_seq_after (gsi, list, GSI_CONTINUE_LINKING);
list = set_component_ssa_name (lhs, true, i);
if (list)
gsi_insert_seq_after (gsi, list, GSI_CONTINUE_LINKING);
}
static void
update_complex_components_on_edge (edge e, tree lhs, tree r, tree i)
{
gimple_seq list;
list = set_component_ssa_name (lhs, false, r);
if (list)
gsi_insert_seq_on_edge (e, list);
list = set_component_ssa_name (lhs, true, i);
if (list)
gsi_insert_seq_on_edge (e, list);
}
/* Update an assignment to a complex variable in place. */
static void
update_complex_assignment (gimple_stmt_iterator *gsi, tree r, tree i)
{
gimple_stmt_iterator orig_si = *gsi;
gimple stmt;
if (gimple_in_ssa_p (cfun))
update_complex_components (gsi, gsi_stmt (*gsi), r, i);
gimple_assign_set_rhs_with_ops (&orig_si, COMPLEX_EXPR, r, i);
stmt = gsi_stmt (orig_si);
update_stmt (stmt);
if (maybe_clean_eh_stmt (stmt))
gimple_purge_dead_eh_edges (gimple_bb (stmt));
}
/* Generate code at the entry point of the function to initialize the
component variables for a complex parameter. */
static void
update_parameter_components (void)
{
edge entry_edge = single_succ_edge (ENTRY_BLOCK_PTR);
tree parm;
for (parm = DECL_ARGUMENTS (cfun->decl); parm ; parm = DECL_CHAIN (parm))
{
tree type = TREE_TYPE (parm);
tree ssa_name, r, i;
if (TREE_CODE (type) != COMPLEX_TYPE || !is_gimple_reg (parm))
continue;
type = TREE_TYPE (type);
ssa_name = gimple_default_def (cfun, parm);
if (!ssa_name)
continue;
r = build1 (REALPART_EXPR, type, ssa_name);
i = build1 (IMAGPART_EXPR, type, ssa_name);
update_complex_components_on_edge (entry_edge, ssa_name, r, i);
}
}
/* Generate code to set the component variables of a complex variable
to match the PHI statements in block BB. */
static void
update_phi_components (basic_block bb)
{
gimple_stmt_iterator gsi;
for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi))
{
gimple phi = gsi_stmt (gsi);
if (is_complex_reg (gimple_phi_result (phi)))
{
tree lr, li;
gimple pr = NULL, pi = NULL;
unsigned int i, n;
lr = get_component_ssa_name (gimple_phi_result (phi), false);
if (TREE_CODE (lr) == SSA_NAME)
{
pr = create_phi_node (lr, bb);
SSA_NAME_DEF_STMT (lr) = pr;
}
li = get_component_ssa_name (gimple_phi_result (phi), true);
if (TREE_CODE (li) == SSA_NAME)
{
pi = create_phi_node (li, bb);
SSA_NAME_DEF_STMT (li) = pi;
}
for (i = 0, n = gimple_phi_num_args (phi); i < n; ++i)
{
tree comp, arg = gimple_phi_arg_def (phi, i);
if (pr)
{
comp = extract_component (NULL, arg, false, false);
SET_PHI_ARG_DEF (pr, i, comp);
}
if (pi)
{
comp = extract_component (NULL, arg, true, false);
SET_PHI_ARG_DEF (pi, i, comp);
}
}
}
}
}
/* Expand a complex move to scalars. */
static void
expand_complex_move (gimple_stmt_iterator *gsi, tree type)
{
tree inner_type = TREE_TYPE (type);
tree r, i, lhs, rhs;
gimple stmt = gsi_stmt (*gsi);
if (is_gimple_assign (stmt))
{
lhs = gimple_assign_lhs (stmt);
if (gimple_num_ops (stmt) == 2)
rhs = gimple_assign_rhs1 (stmt);
else
rhs = NULL_TREE;
}
else if (is_gimple_call (stmt))
{
lhs = gimple_call_lhs (stmt);
rhs = NULL_TREE;
}
else
gcc_unreachable ();
if (TREE_CODE (lhs) == SSA_NAME)
{
if (is_ctrl_altering_stmt (stmt))
{
edge e;
/* The value is not assigned on the exception edges, so we need not
concern ourselves there. We do need to update on the fallthru
edge. Find it. */
e = find_fallthru_edge (gsi_bb (*gsi)->succs);
if (!e)
gcc_unreachable ();
r = build1 (REALPART_EXPR, inner_type, lhs);
i = build1 (IMAGPART_EXPR, inner_type, lhs);
update_complex_components_on_edge (e, lhs, r, i);
}
else if (is_gimple_call (stmt)
|| gimple_has_side_effects (stmt)
|| gimple_assign_rhs_code (stmt) == PAREN_EXPR)
{
r = build1 (REALPART_EXPR, inner_type, lhs);
i = build1 (IMAGPART_EXPR, inner_type, lhs);
update_complex_components (gsi, stmt, r, i);
}
else
{
if (gimple_assign_rhs_code (stmt) != COMPLEX_EXPR)
{
r = extract_component (gsi, rhs, 0, true);
i = extract_component (gsi, rhs, 1, true);
}
else
{
r = gimple_assign_rhs1 (stmt);
i = gimple_assign_rhs2 (stmt);
}
update_complex_assignment (gsi, r, i);
}
}
else if (rhs && TREE_CODE (rhs) == SSA_NAME && !TREE_SIDE_EFFECTS (lhs))
{
tree x;
gimple t;
r = extract_component (gsi, rhs, 0, false);
i = extract_component (gsi, rhs, 1, false);
x = build1 (REALPART_EXPR, inner_type, unshare_expr (lhs));
t = gimple_build_assign (x, r);
gsi_insert_before (gsi, t, GSI_SAME_STMT);
if (stmt == gsi_stmt (*gsi))
{
x = build1 (IMAGPART_EXPR, inner_type, unshare_expr (lhs));
gimple_assign_set_lhs (stmt, x);
gimple_assign_set_rhs1 (stmt, i);
}
else
{
x = build1 (IMAGPART_EXPR, inner_type, unshare_expr (lhs));
t = gimple_build_assign (x, i);
gsi_insert_before (gsi, t, GSI_SAME_STMT);
stmt = gsi_stmt (*gsi);
gcc_assert (gimple_code (stmt) == GIMPLE_RETURN);
gimple_return_set_retval (stmt, lhs);
}
update_stmt (stmt);
}
}
/* Expand complex addition to scalars:
a + b = (ar + br) + i(ai + bi)
a - b = (ar - br) + i(ai + bi)
*/
static void
expand_complex_addition (gimple_stmt_iterator *gsi, tree inner_type,
tree ar, tree ai, tree br, tree bi,
enum tree_code code,
complex_lattice_t al, complex_lattice_t bl)
{
tree rr, ri;
switch (PAIR (al, bl))
{
case PAIR (ONLY_REAL, ONLY_REAL):
rr = gimplify_build2 (gsi, code, inner_type, ar, br);
ri = ai;
break;
case PAIR (ONLY_REAL, ONLY_IMAG):
rr = ar;
if (code == MINUS_EXPR)
ri = gimplify_build2 (gsi, MINUS_EXPR, inner_type, ai, bi);
else
ri = bi;
break;
case PAIR (ONLY_IMAG, ONLY_REAL):
if (code == MINUS_EXPR)
rr = gimplify_build2 (gsi, MINUS_EXPR, inner_type, ar, br);
else
rr = br;
ri = ai;
break;
case PAIR (ONLY_IMAG, ONLY_IMAG):
rr = ar;
ri = gimplify_build2 (gsi, code, inner_type, ai, bi);
break;
case PAIR (VARYING, ONLY_REAL):
rr = gimplify_build2 (gsi, code, inner_type, ar, br);
ri = ai;
break;
case PAIR (VARYING, ONLY_IMAG):
rr = ar;
ri = gimplify_build2 (gsi, code, inner_type, ai, bi);
break;
case PAIR (ONLY_REAL, VARYING):
if (code == MINUS_EXPR)
goto general;
rr = gimplify_build2 (gsi, code, inner_type, ar, br);
ri = bi;
break;
case PAIR (ONLY_IMAG, VARYING):
if (code == MINUS_EXPR)
goto general;
rr = br;
ri = gimplify_build2 (gsi, code, inner_type, ai, bi);
break;
case PAIR (VARYING, VARYING):
general:
rr = gimplify_build2 (gsi, code, inner_type, ar, br);
ri = gimplify_build2 (gsi, code, inner_type, ai, bi);
break;
default:
gcc_unreachable ();
}
update_complex_assignment (gsi, rr, ri);
}
/* Expand a complex multiplication or division to a libcall to the c99
compliant routines. */
static void
expand_complex_libcall (gimple_stmt_iterator *gsi, tree ar, tree ai,
tree br, tree bi, enum tree_code code)
{
enum machine_mode mode;
enum built_in_function bcode;
tree fn, type, lhs;
gimple old_stmt, stmt;
old_stmt = gsi_stmt (*gsi);
lhs = gimple_assign_lhs (old_stmt);
type = TREE_TYPE (lhs);
mode = TYPE_MODE (type);
gcc_assert (GET_MODE_CLASS (mode) == MODE_COMPLEX_FLOAT);
if (code == MULT_EXPR)
bcode = ((enum built_in_function)
(BUILT_IN_COMPLEX_MUL_MIN + mode - MIN_MODE_COMPLEX_FLOAT));
else if (code == RDIV_EXPR)
bcode = ((enum built_in_function)
(BUILT_IN_COMPLEX_DIV_MIN + mode - MIN_MODE_COMPLEX_FLOAT));
else
gcc_unreachable ();
fn = builtin_decl_explicit (bcode);
stmt = gimple_build_call (fn, 4, ar, ai, br, bi);
gimple_call_set_lhs (stmt, lhs);
update_stmt (stmt);
gsi_replace (gsi, stmt, false);
if (maybe_clean_or_replace_eh_stmt (old_stmt, stmt))
gimple_purge_dead_eh_edges (gsi_bb (*gsi));
if (gimple_in_ssa_p (cfun))
{
type = TREE_TYPE (type);
update_complex_components (gsi, stmt,
build1 (REALPART_EXPR, type, lhs),
build1 (IMAGPART_EXPR, type, lhs));
SSA_NAME_DEF_STMT (lhs) = stmt;
}
}
/* Expand complex multiplication to scalars:
a * b = (ar*br - ai*bi) + i(ar*bi + br*ai)
*/
static void
expand_complex_multiplication (gimple_stmt_iterator *gsi, tree inner_type,
tree ar, tree ai, tree br, tree bi,
complex_lattice_t al, complex_lattice_t bl)
{
tree rr, ri;
if (al < bl)
{
complex_lattice_t tl;
rr = ar, ar = br, br = rr;
ri = ai, ai = bi, bi = ri;
tl = al, al = bl, bl = tl;
}
switch (PAIR (al, bl))
{
case PAIR (ONLY_REAL, ONLY_REAL):