static void mmix_file_end (void);
static bool mmix_rtx_costs (rtx, int, int, int *);
static rtx mmix_struct_value_rtx (tree, int);
+static tree mmix_gimplify_va_arg_expr (tree, tree, tree *, tree *);
/* Target structure macros. Listed by node. See `Using and Porting GCC'
#undef TARGET_SETUP_INCOMING_VARARGS
#define TARGET_SETUP_INCOMING_VARARGS mmix_setup_incoming_varargs
+#undef TARGET_GIMPLIFY_VA_ARG_EXPR
+#define TARGET_GIMPLIFY_VA_ARG_EXPR mmix_gimplify_va_arg_expr
struct gcc_target targetm = TARGET_INITIALIZER;
internal_error ("MMIX Internal: Last named vararg would not fit in a register");
}
-/* EXPAND_BUILTIN_VA_ARG. */
+/* Gimplify VA_ARG_EXPR. All we need to do is figure out if TYPE is
+ pass-by-reference and hand off to standard routines. */
-/* This is modified from the "standard" implementation of va_arg: read the
- value from the current (padded) address and increment by the (padded)
- size. The difference for MMIX is that if the type is
- pass-by-reference, then perform an indirection. */
+static tree
+mmix_gimplify_va_arg_expr (tree valist, tree type, tree *pre_p, tree *post_p)
+{
+ CUMULATIVE_ARGS cum;
+ cum.lib = 0;
-rtx
-mmix_expand_builtin_va_arg (tree valist, tree type)
-{
- tree ptr_size = size_int (BITS_PER_WORD / BITS_PER_UNIT);
- tree addr_tree, type_size = NULL;
- tree align, alignm1;
- tree rounded_size;
- rtx addr;
-
- /* Compute the rounded size of the type. */
-
- /* Get AP. */
- addr_tree = valist;
- align = size_int (PARM_BOUNDARY / BITS_PER_UNIT);
- alignm1 = size_int (PARM_BOUNDARY / BITS_PER_UNIT - 1);
- if (type == error_mark_node
- || (type_size = TYPE_SIZE_UNIT (TYPE_MAIN_VARIANT (type))) == NULL
- || TREE_OVERFLOW (type_size))
- /* Presumably an error; the size isn't computable. A message has
- supposedly been emitted elsewhere. */
- rounded_size = size_zero_node;
+ if (mmix_function_arg_pass_by_reference (&cum, TYPE_MODE (type), type, 0))
+ return ind_gimplify_va_arg_expr (valist, type, pre_p, post_p);
else
- rounded_size = fold (build (MULT_EXPR, sizetype,
- fold (build (TRUNC_DIV_EXPR, sizetype,
- fold (build (PLUS_EXPR, sizetype,
- type_size, alignm1)),
- align)),
- align));
-
- if (AGGREGATE_TYPE_P (type)
- && GET_MODE_UNIT_SIZE (TYPE_MODE (type)) < 8
- && GET_MODE_UNIT_SIZE (TYPE_MODE (type)) != 0)
- {
- /* Adjust for big-endian the location of aggregates passed in a
- register, but where the aggregate is accessed in a shorter mode
- than the natural register mode (i.e. it is accessed as SFmode(?),
- SImode, HImode or QImode rather than DImode or DFmode(?)). FIXME:
- Or should we adjust the mode in which the aggregate is read, to be
- a register size mode? (Hum, nah, a small offset is generally
- cheaper than a wider memory access on MMIX.) */
- addr_tree
- = build (PLUS_EXPR, TREE_TYPE (addr_tree), addr_tree,
- size_int ((BITS_PER_WORD / BITS_PER_UNIT)
- - GET_MODE_UNIT_SIZE (TYPE_MODE (type))));
- }
- else if (!integer_zerop (rounded_size))
- {
- if (!really_constant_p (type_size))
- /* Varying-size types come in by reference. */
- addr_tree
- = build1 (INDIRECT_REF, build_pointer_type (type), addr_tree);
- else
- {
- /* If the size is less than a register, then we need to pad the
- address by adding the difference. */
- tree addend
- = fold (build (COND_EXPR, sizetype,
- fold (build (GT_EXPR, sizetype,
- rounded_size,
- align)),
- size_zero_node,
- fold (build (MINUS_EXPR, sizetype,
- rounded_size,
- type_size))));
- tree addr_tree1
- = fold (build (PLUS_EXPR, TREE_TYPE (addr_tree), addr_tree,
- addend));
-
- /* If this type is larger than what fits in a register, then it
- is passed by reference. */
- addr_tree
- = fold (build (COND_EXPR, TREE_TYPE (addr_tree1),
- fold (build (GT_EXPR, sizetype,
- rounded_size,
- ptr_size)),
- build1 (INDIRECT_REF, build_pointer_type (type),
- addr_tree1),
- addr_tree1));
- }
- }
-
- addr = expand_expr (addr_tree, NULL_RTX, Pmode, EXPAND_NORMAL);
- addr = copy_to_reg (addr);
-
- if (!integer_zerop (rounded_size))
- {
- /* Compute new value for AP. For MMIX, it is always advanced by the
- size of a register. */
- tree t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
- build (PLUS_EXPR, TREE_TYPE (valist), valist,
- ptr_size));
- TREE_SIDE_EFFECTS (t) = 1;
- expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
- }
-
- return addr;
+ return std_gimplify_va_arg_expr (valist, type, pre_p, post_p);
}
/* TRAMPOLINE_SIZE. */
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