static rtx store_field (rtx, HOST_WIDE_INT, HOST_WIDE_INT, enum machine_mode,
tree, tree, int);
-static unsigned HOST_WIDE_INT highest_pow2_factor (tree);
static unsigned HOST_WIDE_INT highest_pow2_factor_for_target (tree, tree);
static int is_aligning_offset (tree, tree);
/* This array records the insn_code of insns to perform block sets. */
enum insn_code setmem_optab[NUM_MACHINE_MODES];
-/* These arrays record the insn_code of two different kinds of insns
+/* These arrays record the insn_code of three different kinds of insns
to perform block compares. */
enum insn_code cmpstr_optab[NUM_MACHINE_MODES];
+enum insn_code cmpstrn_optab[NUM_MACHINE_MODES];
enum insn_code cmpmem_optab[NUM_MACHINE_MODES];
/* Synchronization primitives. */
adjust_address_nv. Instead of preparing fallback support for an
invalid address, we call adjust_address_nv directly. */
if (MEM_P (cplx))
- emit_move_insn (adjust_address_nv (cplx, imode,
- imag_p ? GET_MODE_SIZE (imode) : 0),
- val);
+ {
+ emit_move_insn (adjust_address_nv (cplx, imode,
+ imag_p ? GET_MODE_SIZE (imode) : 0),
+ val);
+ return;
+ }
/* If the sub-object is at least word sized, then we know that subregging
will work. This special case is important, since store_bit_field
emitted, or NULL if such a move could not be generated. */
static rtx
-emit_move_via_integer (enum machine_mode mode, rtx x, rtx y)
+emit_move_via_integer (enum machine_mode mode, rtx x, rtx y, bool force)
{
enum machine_mode imode;
enum insn_code code;
if (code == CODE_FOR_nothing)
return NULL_RTX;
- x = emit_move_change_mode (imode, mode, x, false);
+ x = emit_move_change_mode (imode, mode, x, force);
if (x == NULL_RTX)
return NULL_RTX;
- y = emit_move_change_mode (imode, mode, y, false);
+ y = emit_move_change_mode (imode, mode, y, force);
if (y == NULL_RTX)
return NULL_RTX;
return emit_insn (GEN_FCN (code) (x, y));
return get_last_insn ();
}
- ret = emit_move_via_integer (mode, x, y);
+ ret = emit_move_via_integer (mode, x, y, true);
if (ret)
return ret;
}
}
/* Otherwise, find the MODE_INT mode of the same width. */
- ret = emit_move_via_integer (mode, x, y);
+ ret = emit_move_via_integer (mode, x, y, false);
gcc_assert (ret != NULL);
return ret;
}
fits within a HOST_WIDE_INT. */
if (!CONSTANT_P (y) || GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT)
{
- rtx ret = emit_move_via_integer (mode, x, y);
+ rtx ret = emit_move_via_integer (mode, x, y, false);
if (ret)
return ret;
}
enum machine_mode orig_srcmode = GET_MODE (y);
enum machine_mode srcmode;
REAL_VALUE_TYPE r;
+ int oldcost, newcost;
REAL_VALUE_FROM_CONST_DOUBLE (r, y);
+ if (LEGITIMATE_CONSTANT_P (y))
+ oldcost = rtx_cost (y, SET);
+ else
+ oldcost = rtx_cost (force_const_mem (dstmode, y), SET);
+
for (srcmode = GET_CLASS_NARROWEST_MODE (GET_MODE_CLASS (orig_srcmode));
srcmode != orig_srcmode;
srcmode = GET_MODE_WIDER_MODE (srcmode))
the extension. */
if (! (*insn_data[ic].operand[1].predicate) (trunc_y, srcmode))
continue;
+ /* This is valid, but may not be cheaper than the original. */
+ newcost = rtx_cost (gen_rtx_FLOAT_EXTEND (dstmode, trunc_y), SET);
+ if (oldcost < newcost)
+ continue;
}
else if (float_extend_from_mem[dstmode][srcmode])
- trunc_y = validize_mem (force_const_mem (srcmode, trunc_y));
+ {
+ trunc_y = force_const_mem (srcmode, trunc_y);
+ /* This is valid, but may not be cheaper than the original. */
+ newcost = rtx_cost (gen_rtx_FLOAT_EXTEND (dstmode, trunc_y), SET);
+ if (oldcost < newcost)
+ continue;
+ trunc_y = validize_mem (trunc_y);
+ }
else
continue;
-
+
emit_unop_insn (ic, x, trunc_y, UNKNOWN);
last_insn = get_last_insn ();
offset = 0;
/* Now NOT_STACK gets the number of words that we don't need to
- allocate on the stack. Convert OFFSET to words too. */
+ allocate on the stack. Convert OFFSET to words too. */
not_stack = (partial - offset) / UNITS_PER_WORD;
offset /= UNITS_PER_WORD;
if (offset != 0)
{
- rtx offset_rtx = expand_expr (offset, NULL_RTX, VOIDmode, EXPAND_SUM);
+ rtx offset_rtx;
- gcc_assert (MEM_P (to_rtx));
+ if (!MEM_P (to_rtx))
+ {
+ /* We can get constant negative offsets into arrays with broken
+ user code. Translate this to a trap instead of ICEing. */
+ gcc_assert (TREE_CODE (offset) == INTEGER_CST);
+ expand_builtin_trap ();
+ to_rtx = gen_rtx_MEM (BLKmode, const0_rtx);
+ }
+ offset_rtx = expand_expr (offset, NULL_RTX, VOIDmode, EXPAND_SUM);
#ifdef POINTERS_EXTEND_UNSIGNED
if (GET_MODE (offset_rtx) != Pmode)
offset_rtx = convert_to_mode (Pmode, offset_rtx, 0);
HOST_WIDE_INT *p_elt_count,
bool *p_must_clear)
{
+ unsigned HOST_WIDE_INT idx;
HOST_WIDE_INT nz_elts, nc_elts, elt_count;
- tree list;
+ tree value, purpose;
nz_elts = 0;
nc_elts = 0;
elt_count = 0;
- for (list = CONSTRUCTOR_ELTS (ctor); list; list = TREE_CHAIN (list))
+ FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (ctor), idx, purpose, value)
{
- tree value = TREE_VALUE (list);
- tree purpose = TREE_PURPOSE (list);
HOST_WIDE_INT mult;
mult = 1;
tree init_sub_type;
bool clear_this = true;
- list = CONSTRUCTOR_ELTS (ctor);
- if (list)
+ if (!VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (ctor)))
{
/* We don't expect more than one element of the union to be
initialized. Not sure what we should do otherwise... */
- gcc_assert (TREE_CHAIN (list) == NULL);
+ gcc_assert (VEC_length (constructor_elt, CONSTRUCTOR_ELTS (ctor))
+ == 1);
- init_sub_type = TREE_TYPE (TREE_VALUE (list));
+ init_sub_type = TREE_TYPE (VEC_index (constructor_elt,
+ CONSTRUCTOR_ELTS (ctor),
+ 0)->value);
/* ??? We could look at each element of the union, and find the
largest element. Which would avoid comparing the size of the
/* And now we have to find out if the element itself is fully
constructed. E.g. for union { struct { int a, b; } s; } u
= { .s = { .a = 1 } }. */
- if (elt_count == count_type_elements (init_sub_type))
+ if (elt_count == count_type_elements (init_sub_type, false))
clear_this = false;
}
}
}
/* Count the number of scalars in TYPE. Return -1 on overflow or
- variable-sized. */
+ variable-sized. If ALLOW_FLEXARR is true, don't count flexible
+ array member at the end of the structure. */
HOST_WIDE_INT
-count_type_elements (tree type)
+count_type_elements (tree type, bool allow_flexarr)
{
const HOST_WIDE_INT max = ~((HOST_WIDE_INT)1 << (HOST_BITS_PER_WIDE_INT-1));
switch (TREE_CODE (type))
if (telts && host_integerp (telts, 1))
{
HOST_WIDE_INT n = tree_low_cst (telts, 1) + 1;
- HOST_WIDE_INT m = count_type_elements (TREE_TYPE (type));
+ HOST_WIDE_INT m = count_type_elements (TREE_TYPE (type), false);
if (n == 0)
return 0;
else if (max / n > m)
for (f = TYPE_FIELDS (type); f ; f = TREE_CHAIN (f))
if (TREE_CODE (f) == FIELD_DECL)
{
- t = count_type_elements (TREE_TYPE (f));
+ t = count_type_elements (TREE_TYPE (f), false);
if (t < 0)
- return -1;
+ {
+ /* Check for structures with flexible array member. */
+ tree tf = TREE_TYPE (f);
+ if (allow_flexarr
+ && TREE_CHAIN (f) == NULL
+ && TREE_CODE (tf) == ARRAY_TYPE
+ && TYPE_DOMAIN (tf)
+ && TYPE_MIN_VALUE (TYPE_DOMAIN (tf))
+ && integer_zerop (TYPE_MIN_VALUE (TYPE_DOMAIN (tf)))
+ && !TYPE_MAX_VALUE (TYPE_DOMAIN (tf))
+ && int_size_in_bytes (type) >= 0)
+ break;
+
+ return -1;
+ }
n += t;
}
if (must_clear)
return 1;
- elts = count_type_elements (TREE_TYPE (exp));
+ elts = count_type_elements (TREE_TYPE (exp), false);
return nz_elts < elts / 4;
}
return initializer_zerop (exp);
}
+
+/* Return 1 if EXP contains all zeros. */
+
+static int
+all_zeros_p (tree exp)
+{
+ if (TREE_CODE (exp) == CONSTRUCTOR)
+
+ {
+ HOST_WIDE_INT nz_elts, nc_elts, count;
+ bool must_clear;
+
+ categorize_ctor_elements (exp, &nz_elts, &nc_elts, &count, &must_clear);
+ return nz_elts == 0;
+ }
+
+ return initializer_zerop (exp);
+}
\f
/* Helper function for store_constructor.
TARGET, BITSIZE, BITPOS, MODE, EXP are as for store_field.
case UNION_TYPE:
case QUAL_UNION_TYPE:
{
- tree elt;
+ unsigned HOST_WIDE_INT idx;
+ tree field, value;
/* If size is zero or the target is already cleared, do nothing. */
if (size == 0 || cleared)
register whose mode size isn't equal to SIZE since
clear_storage can't handle this case. */
else if (size > 0
- && ((list_length (CONSTRUCTOR_ELTS (exp))
+ && (((int)VEC_length (constructor_elt, CONSTRUCTOR_ELTS (exp))
!= fields_length (type))
|| mostly_zeros_p (exp))
&& (!REG_P (target)
/* Store each element of the constructor into the
corresponding field of TARGET. */
-
- for (elt = CONSTRUCTOR_ELTS (exp); elt; elt = TREE_CHAIN (elt))
+ FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), idx, field, value)
{
- tree field = TREE_PURPOSE (elt);
- tree value = TREE_VALUE (elt);
enum machine_mode mode;
HOST_WIDE_INT bitsize;
HOST_WIDE_INT bitpos = 0;
}
case ARRAY_TYPE:
{
- tree elt;
- int i;
+ tree value, index;
+ unsigned HOST_WIDE_INT i;
int need_to_clear;
tree domain;
tree elttype = TREE_TYPE (type);
need_to_clear = 1;
else
{
+ unsigned HOST_WIDE_INT idx;
+ tree index, value;
HOST_WIDE_INT count = 0, zero_count = 0;
need_to_clear = ! const_bounds_p;
/* This loop is a more accurate version of the loop in
mostly_zeros_p (it handles RANGE_EXPR in an index). It
is also needed to check for missing elements. */
- for (elt = CONSTRUCTOR_ELTS (exp);
- elt != NULL_TREE && ! need_to_clear;
- elt = TREE_CHAIN (elt))
+ FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), idx, index, value)
{
- tree index = TREE_PURPOSE (elt);
HOST_WIDE_INT this_node_count;
+
+ if (need_to_clear)
+ break;
if (index != NULL_TREE && TREE_CODE (index) == RANGE_EXPR)
{
this_node_count = 1;
count += this_node_count;
- if (mostly_zeros_p (TREE_VALUE (elt)))
+ if (mostly_zeros_p (value))
zero_count += this_node_count;
}
/* Store each element of the constructor into the
corresponding element of TARGET, determined by counting the
elements. */
- for (elt = CONSTRUCTOR_ELTS (exp), i = 0;
- elt;
- elt = TREE_CHAIN (elt), i++)
+ FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp), i, index, value)
{
enum machine_mode mode;
HOST_WIDE_INT bitsize;
HOST_WIDE_INT bitpos;
int unsignedp;
- tree value = TREE_VALUE (elt);
- tree index = TREE_PURPOSE (elt);
rtx xtarget = target;
if (cleared && initializer_zerop (value))
case VECTOR_TYPE:
{
- tree elt;
+ unsigned HOST_WIDE_INT idx;
+ constructor_elt *ce;
int i;
int need_to_clear;
int icode = 0;
else
{
unsigned HOST_WIDE_INT count = 0, zero_count = 0;
+ tree value;
- for (elt = CONSTRUCTOR_ELTS (exp);
- elt != NULL_TREE;
- elt = TREE_CHAIN (elt))
+ FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value)
{
int n_elts_here = tree_low_cst
(int_const_binop (TRUNC_DIV_EXPR,
- TYPE_SIZE (TREE_TYPE (TREE_VALUE (elt))),
+ TYPE_SIZE (TREE_TYPE (value)),
TYPE_SIZE (elttype), 0), 1);
count += n_elts_here;
- if (mostly_zeros_p (TREE_VALUE (elt)))
+ if (mostly_zeros_p (value))
zero_count += n_elts_here;
}
/* Store each element of the constructor into the corresponding
element of TARGET, determined by counting the elements. */
- for (elt = CONSTRUCTOR_ELTS (exp), i = 0;
- elt;
- elt = TREE_CHAIN (elt), i += bitsize / elt_size)
+ for (idx = 0, i = 0;
+ VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (exp), idx, ce);
+ idx++, i += bitsize / elt_size)
{
- tree value = TREE_VALUE (elt);
- tree index = TREE_PURPOSE (elt);
HOST_WIDE_INT eltpos;
+ tree value = ce->value;
bitsize = tree_low_cst (TYPE_SIZE (TREE_TYPE (value)), 1);
if (cleared && initializer_zerop (value))
continue;
- if (index != 0)
- eltpos = tree_low_cst (index, 1);
+ if (ce->index)
+ eltpos = tree_low_cst (ce->index, 1);
else
eltpos = i;
/* Return the highest power of two that EXP is known to be a multiple of.
This is used in updating alignment of MEMs in array references. */
-static unsigned HOST_WIDE_INT
+unsigned HOST_WIDE_INT
highest_pow2_factor (tree exp)
{
unsigned HOST_WIDE_INT c0, c1;
result = convert_memory_address (tmode, result);
tmp = convert_memory_address (tmode, tmp);
- if (modifier == EXPAND_SUM)
+ if (modifier == EXPAND_SUM || modifier == EXPAND_INITIALIZER)
result = gen_rtx_PLUS (tmode, result, tmp);
else
{
target = 0;
}
- /* If will do cse, generate all results into pseudo registers
- since 1) that allows cse to find more things
- and 2) otherwise cse could produce an insn the machine
- cannot support. An exception is a CONSTRUCTOR into a multi-word
- MEM: that's much more likely to be most efficient into the MEM.
- Another is a CALL_EXPR which must return in memory. */
-
- if (! cse_not_expected && mode != BLKmode && target
- && (!REG_P (target) || REGNO (target) < FIRST_PSEUDO_REGISTER)
- && ! (code == CONSTRUCTOR && GET_MODE_SIZE (mode) > UNITS_PER_WORD)
- && ! (code == CALL_EXPR && aggregate_value_p (exp, exp)))
- target = 0;
switch (code)
{
|| GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (exp))) == MODE_VECTOR_FLOAT)
return const_vector_from_tree (exp);
else
- return expand_expr (build1 (CONSTRUCTOR, TREE_TYPE (exp),
- TREE_VECTOR_CST_ELTS (exp)),
+ return expand_expr (build_constructor_from_list
+ (TREE_TYPE (exp),
+ TREE_VECTOR_CST_ELTS (exp)),
ignore ? const0_rtx : target, tmode, modifier);
case CONST_DECL:
subexpressions. */
if (ignore)
{
- tree elt;
+ unsigned HOST_WIDE_INT idx;
+ tree value;
- for (elt = CONSTRUCTOR_ELTS (exp); elt; elt = TREE_CHAIN (elt))
- expand_expr (TREE_VALUE (elt), const0_rtx, VOIDmode, 0);
+ FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value)
+ expand_expr (value, const0_rtx, VOIDmode, 0);
return const0_rtx;
}
+ /* Try to avoid creating a temporary at all. This is possible
+ if all of the initializer is zero.
+ FIXME: try to handle all [0..255] initializers we can handle
+ with memset. */
+ else if (TREE_STATIC (exp)
+ && !TREE_ADDRESSABLE (exp)
+ && target != 0 && mode == BLKmode
+ && all_zeros_p (exp))
+ {
+ clear_storage (target, expr_size (exp), BLOCK_OP_NORMAL);
+ return target;
+ }
+
/* All elts simple constants => refer to a constant in memory. But
if this is a non-BLKmode mode, let it store a field at a time
since that should make a CONST_INT or CONST_DOUBLE when we
int icode;
rtx reg, insn;
- gcc_assert (modifier == EXPAND_NORMAL);
+ gcc_assert (modifier == EXPAND_NORMAL
+ || modifier == EXPAND_STACK_PARM);
/* The vectorizer should have already checked the mode. */
icode = movmisalign_optab->handlers[mode].insn_code;
&& ! TREE_SIDE_EFFECTS (array)
&& TREE_CODE (index) == INTEGER_CST)
{
- tree elem;
-
- for (elem = CONSTRUCTOR_ELTS (array);
- (elem && !tree_int_cst_equal (TREE_PURPOSE (elem), index));
- elem = TREE_CHAIN (elem))
- ;
+ unsigned HOST_WIDE_INT ix;
+ tree field, value;
- if (elem && !TREE_SIDE_EFFECTS (TREE_VALUE (elem)))
- return expand_expr (fold (TREE_VALUE (elem)), target, tmode,
- modifier);
+ FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (array), ix,
+ field, value)
+ if (tree_int_cst_equal (field, index))
+ {
+ if (!TREE_SIDE_EFFECTS (value))
+ return expand_expr (fold (value), target, tmode, modifier);
+ break;
+ }
}
else if (optimize >= 1
if (TREE_CODE (init) == CONSTRUCTOR)
{
- tree elem;
-
- for (elem = CONSTRUCTOR_ELTS (init);
- (elem
- && !tree_int_cst_equal (TREE_PURPOSE (elem), index));
- elem = TREE_CHAIN (elem))
- ;
-
- if (elem && !TREE_SIDE_EFFECTS (TREE_VALUE (elem)))
- return expand_expr (fold (TREE_VALUE (elem)), target,
- tmode, modifier);
+ unsigned HOST_WIDE_INT ix;
+ tree field, value;
+
+ FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (init), ix,
+ field, value)
+ if (tree_int_cst_equal (field, index))
+ {
+ if (!TREE_SIDE_EFFECTS (value))
+ return expand_expr (fold (value), target, tmode,
+ modifier);
+ break;
+ }
}
else if (TREE_CODE (init) == STRING_CST
&& 0 > compare_tree_int (index,
appropriate field if it is present. */
if (TREE_CODE (TREE_OPERAND (exp, 0)) == CONSTRUCTOR)
{
- tree elt;
+ unsigned HOST_WIDE_INT idx;
+ tree field, value;
- for (elt = CONSTRUCTOR_ELTS (TREE_OPERAND (exp, 0)); elt;
- elt = TREE_CHAIN (elt))
- if (TREE_PURPOSE (elt) == TREE_OPERAND (exp, 1)
+ FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (TREE_OPERAND (exp, 0)),
+ idx, field, value)
+ if (field == TREE_OPERAND (exp, 1)
/* We can normally use the value of the field in the
CONSTRUCTOR. However, if this is a bitfield in
an integral mode that we can fit in a HOST_WIDE_INT,
since this is done implicitly by the constructor. If
the bitfield does not meet either of those conditions,
we can't do this optimization. */
- && (! DECL_BIT_FIELD (TREE_PURPOSE (elt))
- || ((GET_MODE_CLASS (DECL_MODE (TREE_PURPOSE (elt)))
- == MODE_INT)
- && (GET_MODE_BITSIZE (DECL_MODE (TREE_PURPOSE (elt)))
+ && (! DECL_BIT_FIELD (field)
+ || ((GET_MODE_CLASS (DECL_MODE (field)) == MODE_INT)
+ && (GET_MODE_BITSIZE (DECL_MODE (field))
<= HOST_BITS_PER_WIDE_INT))))
{
- if (DECL_BIT_FIELD (TREE_PURPOSE (elt))
+ if (DECL_BIT_FIELD (field)
&& modifier == EXPAND_STACK_PARM)
target = 0;
- op0 = expand_expr (TREE_VALUE (elt), target, tmode, modifier);
- if (DECL_BIT_FIELD (TREE_PURPOSE (elt)))
+ op0 = expand_expr (value, target, tmode, modifier);
+ if (DECL_BIT_FIELD (field))
{
- HOST_WIDE_INT bitsize
- = TREE_INT_CST_LOW (DECL_SIZE (TREE_PURPOSE (elt)));
- enum machine_mode imode
- = TYPE_MODE (TREE_TYPE (TREE_PURPOSE (elt)));
+ HOST_WIDE_INT bitsize = TREE_INT_CST_LOW (DECL_SIZE (field));
+ enum machine_mode imode = TYPE_MODE (TREE_TYPE (field));
- if (TYPE_UNSIGNED (TREE_TYPE (TREE_PURPOSE (elt))))
+ if (TYPE_UNSIGNED (TREE_TYPE (field)))
{
op1 = GEN_INT (((HOST_WIDE_INT) 1 << bitsize) - 1);
op0 = expand_and (imode, op0, op1, target);
|| modifier == EXPAND_STACK_PARM)
? modifier : EXPAND_NORMAL);
- /* If this is a constant, put it into a register if it is a
- legitimate constant and OFFSET is 0 and memory if it isn't. */
+ /* If this is a constant, put it into a register if it is a legitimate
+ constant, OFFSET is 0, and we won't try to extract outside the
+ register (in case we were passed a partially uninitialized object
+ or a view_conversion to a larger size). Force the constant to
+ memory otherwise. */
if (CONSTANT_P (op0))
{
enum machine_mode mode = TYPE_MODE (TREE_TYPE (tem));
if (mode != BLKmode && LEGITIMATE_CONSTANT_P (op0)
- && offset == 0)
+ && offset == 0
+ && bitpos + bitsize <= GET_MODE_BITSIZE (mode))
op0 = force_reg (mode, op0);
else
op0 = validize_mem (force_const_mem (mode, op0));
}
- /* Otherwise, if this object not in memory and we either have an
- offset or a BLKmode result, put it there. This case can't occur in
- C, but can in Ada if we have unchecked conversion of an expression
- from a scalar type to an array or record type or for an
- ARRAY_RANGE_REF whose type is BLKmode. */
+ /* Otherwise, if this object not in memory and we either have an
+ offset, a BLKmode result, or a reference outside the object, put it
+ there. Such cases can occur in Ada if we have unchecked conversion
+ of an expression from a scalar type to an array or record type or
+ for an ARRAY_RANGE_REF whose type is BLKmode. */
else if (!MEM_P (op0)
&& (offset != 0
+ || (bitpos + bitsize > GET_MODE_BITSIZE (GET_MODE (op0)))
|| (code == ARRAY_RANGE_REF && mode == BLKmode)))
{
tree nt = build_qualified_type (TREE_TYPE (tem),
case VIEW_CONVERT_EXPR:
op0 = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, mode, modifier);
- /* If the input and output modes are both the same, we are done.
- Otherwise, if neither mode is BLKmode and both are integral and within
- a word, we can use gen_lowpart. If neither is true, make sure the
- operand is in memory and convert the MEM to the new mode. */
+ /* If the input and output modes are both the same, we are done. */
if (TYPE_MODE (type) == GET_MODE (op0))
;
+ /* If neither mode is BLKmode, and both modes are the same size
+ then we can use gen_lowpart. */
else if (TYPE_MODE (type) != BLKmode && GET_MODE (op0) != BLKmode
- && GET_MODE_CLASS (GET_MODE (op0)) == MODE_INT
- && GET_MODE_CLASS (TYPE_MODE (type)) == MODE_INT
- && GET_MODE_SIZE (TYPE_MODE (type)) <= UNITS_PER_WORD
- && GET_MODE_SIZE (GET_MODE (op0)) <= UNITS_PER_WORD)
- op0 = gen_lowpart (TYPE_MODE (type), op0);
+ && GET_MODE_SIZE (TYPE_MODE (type))
+ == GET_MODE_SIZE (GET_MODE (op0)))
+ {
+ if (GET_CODE (op0) == SUBREG)
+ op0 = force_reg (GET_MODE (op0), op0);
+ op0 = gen_lowpart (TYPE_MODE (type), op0);
+ }
+ /* If both modes are integral, then we can convert from one to the
+ other. */
+ else if (SCALAR_INT_MODE_P (GET_MODE (op0))
+ && SCALAR_INT_MODE_P (TYPE_MODE (type)))
+ op0 = convert_modes (TYPE_MODE (type), GET_MODE (op0), op0,
+ TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (exp, 0))));
+ /* As a last resort, spill op0 to memory, and reload it in a
+ different mode. */
else if (!MEM_P (op0))
{
/* If the operand is not a MEM, force it into memory. Since we
}
else if (TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST
- && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_INT
+ && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT
&& TREE_CONSTANT (TREE_OPERAND (exp, 0)))
{
rtx constant_part;
OSDN Git Service
