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stormy-abi: Updates to varargs descriptions.

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* config/stormy16/stormy-abi:  Updates to varargs descriptions.
        * config/stormy16/stormy16.c (stormy16_build_va_list):  Reverse
        base and count fields.
        (stormy16_expand_builtin_va_start):  last_reg_count changed to
        size_of_reg_args.  Use count + size in first comparison.

From-SVN: r46365
This commit is contained in:
Catherine Moore 2001-10-19 21:23:29 +00:00 • committed by Catherine Moore
parent 16f7dac7f5
commit cf4c092e87
3 changed files with 29 additions and 13 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2001-10-19 Catherine Moore <clm@redhat.com>
* config/stormy16/stormy-abi: Updates to varargs descriptions.
* config/stormy16/stormy16.c (stormy16_build_va_list): Reverse
base and count fields.
(stormy16_expand_builtin_va_start): last_reg_count changed to
size_of_reg_args. Use count + size in first comparison.
Fri Oct 19 15:24:39 2001 Richard Kenner <kenner@vlsi1.ultra.nyu.edu>
* langhooks.h (LANG_HOOKS_HONOR_READONLY): New macro.

14
gcc/config/stormy16/stormy-abi
View file

@ -70,11 +70,13 @@ Both fields are 16 bits. An argument of size N bytes
(N will be even) is accessed as if by the following code:
char *result;
if (count + N > 16)
/* count = #bytes non-variable arguments */
/* 12 = #bytes for register arguments */
if (count + N > 12)
{
if (count < 16)
count = 16;
result = base - (count + N - 16 + 4);
if (count < 12)
count = 12;
result = base - (count + N - 12 + 4);
}
else
{
@ -98,8 +100,8 @@ SP ->
r3
count-> r2
Return address (two words)
9th procedure parameter word
10th procedure parameter word
7th procedure parameter word
8th procedure parameter word
...
last procedure parameter word

20
gcc/config/stormy16/stormy16.c
View file

@ -1131,9 +1131,9 @@ stormy16_build_va_list ()
record = make_lang_type (RECORD_TYPE);
type_decl = build_decl (TYPE_DECL, get_identifier ("__va_list_tag"), record);
f_2 = build_decl (FIELD_DECL, get_identifier ("base"),
f_1 = build_decl (FIELD_DECL, get_identifier ("base"),
ptr_type_node);
f_1 = build_decl (FIELD_DECL, get_identifier ("count"),
f_2 = build_decl (FIELD_DECL, get_identifier ("count"),
unsigned_type_node);
DECL_FIELD_CONTEXT (f_1) = record;
@ -1186,7 +1186,9 @@ stormy16_expand_builtin_va_start (stdarg_p, valist, nextarg)
}
/* Implement the stdarg/varargs va_arg macro. VALIST is the variable
of type va_list as a tree, TYPE is the type passed to va_arg. */
of type va_list as a tree, TYPE is the type passed to va_arg.
Note: This algorithm is documented in stormy-abi. */
rtx
stormy16_expand_builtin_va_arg (valist, type)
tree valist;
@ -1197,8 +1199,9 @@ stormy16_expand_builtin_va_arg (valist, type)
rtx count_rtx, addr_rtx, r;
rtx lab_gotaddr, lab_fromstack;
tree t;
int size, last_reg_count;
int size, size_of_reg_args;
tree size_tree, count_plus_size;
rtx count_plus_size_rtx;
f_base = TYPE_FIELDS (va_list_type_node);
f_count = TREE_CHAIN (f_base);
@ -1209,14 +1212,17 @@ stormy16_expand_builtin_va_arg (valist, type)
size = PUSH_ROUNDING (int_size_in_bytes (type));
size_tree = round_up (size_in_bytes (type), UNITS_PER_WORD);
last_reg_count = NUM_ARGUMENT_REGISTERS * UNITS_PER_WORD - size;
size_of_reg_args = NUM_ARGUMENT_REGISTERS * UNITS_PER_WORD;
count_rtx = expand_expr (count, NULL_RTX, HImode, EXPAND_NORMAL);
lab_gotaddr = gen_label_rtx ();
lab_fromstack = gen_label_rtx ();
addr_rtx = gen_reg_rtx (Pmode);
emit_cmp_and_jump_insns (count_rtx, GEN_INT (last_reg_count),
GTU, const1_rtx, HImode, 1, 1, lab_fromstack);
count_plus_size = build (PLUS_EXPR, TREE_TYPE (count), count, size_tree);
count_plus_size_rtx = expand_expr (count_plus_size, NULL_RTX, HImode, EXPAND_NORMAL);
emit_cmp_and_jump_insns (count_plus_size_rtx, GEN_INT (size_of_reg_args),
GTU, const1_rtx, HImode, 1, 1, lab_fromstack);
t = build (PLUS_EXPR, ptr_type_node, base, count);
r = expand_expr (t, addr_rtx, Pmode, EXPAND_NORMAL);