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[qfcc] Rewrite assignment destination addressing

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It now addressing_mode cleaning up store instructions to use ptr+offset
instead of lea;store ptr...

Entity.field addressing has been impelmented as well.

Move instructions still generate sub-optimal code in that they use an
add instruction instead of lea.
This commit is contained in:
Bill Currie 2022-01-28 15:46:29 +09:00
parent d3764c108a
commit 284fcd312d
1 changed files with 22 additions and 31 deletions
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53
tools/qfcc/source/statements.c
View file

@ -792,17 +792,6 @@ operand_address (operand_t *reference, expr_t *e)
op_type_names[reference->op_type]);
}
static __attribute__((pure)) int
is_const_ptr (expr_t *e)
{
if ((e->type != ex_value || e->e.value->lltype != ev_ptr)
|| !(POINTER_VAL (e->e.value->v.pointer) >= 0
&& POINTER_VAL (e->e.value->v.pointer) < 65536)) {
return 0;
}
return 1;
}
static __attribute__((pure)) int
is_indirect (expr_t *e)
{
@ -813,6 +802,10 @@ is_indirect (expr_t *e)
return 0;
}
static sblock_t *addressing_mode (sblock_t *sblock, expr_t *ref,
operand_t **base, operand_t **offset,
pr_ushort_t *mode);
static sblock_t *
expr_assign_copy (sblock_t *sblock, expr_t *e, operand_t **op, operand_t *src)
{
@ -916,6 +909,7 @@ expr_assign (sblock_t *sblock, expr_t *e, operand_t **op)
operand_t *src = 0;
operand_t *dst = 0;
operand_t *ofs = 0;
pr_ushort_t mode = 0; // assign
const char *opcode = "assign";
st_type_t type;
@ -957,26 +951,10 @@ expr_assign (sblock_t *sblock, expr_t *e, operand_t **op)
if (0) {
dereference_dst:
// dst_expr is a dereferenced pointer, so need to un-dereference it
// to get the pointer and switch to storep instructions.
dst_expr = expr_file_line (address_expr (dst_expr, 0), e);
// dst_expr is a dereferenced pointer, so need to get its addressing
// parameters (base and offset) and switch to storep instructions.
sblock = addressing_mode (sblock, dst_expr, &dst, &ofs, &mode);
opcode = "store";
if (dst_expr->type == ex_address && dst_expr->e.address.offset
&& !is_const_ptr (dst_expr->e.address.lvalue)) {
sblock = statement_subexpr (sblock,
dst_expr->e.address.lvalue, &dst);
sblock = statement_subexpr (sblock,
dst_expr->e.address.offset, &ofs);
} else {
sblock = statement_subexpr (sblock, dst_expr, &dst);
if (options.code.progsversion < PROG_VERSION) {
// v6 and v6p stores don't need an index
ofs = 0;
} else {
// ruamoko stores do need an index
ofs = short_operand (0, e);
}
}
type = st_ptrassign;
}
if (op) {
@ -987,6 +965,10 @@ dereference_dst:
}
if (is_entity (dst->type) && ofs && is_field (ofs->type)) {
// need to get a pointer type, entity.field expressions do not provide
// one directly. FIXME it was probably a mistake extracting the operand
// type from the statement expression in dags
dst_expr = expr_file_line (address_expr (dst_expr, 0), dst_expr);
s = new_statement (st_expr, "lea", dst_expr);
s->opa = dst;
s->opb = ofs;
@ -1316,7 +1298,16 @@ addressing_mode (sblock_t *sblock, expr_t *ref,
// ref is known to be either ex_expr or ex_uexpr, with '.' for
// the operator
if (ref->type == ex_expr) {
internal_error (ref, "not implemented");
expr_t *ent_expr = ref->e.expr.e1;
expr_t *fld_expr = ref->e.expr.e2;
if (!is_entity (get_type (ent_expr))
|| !is_field (get_type (fld_expr))) {
print_expr (ref);
internal_error (ref, "expected entity.field");
}
sblock = statement_subexpr (sblock, ent_expr, base);
sblock = statement_subexpr (sblock, fld_expr, offset);
*mode = 1;//entity.field
} else if (ref->type == ex_uexpr) {
sblock = ptr_addressing_mode (sblock, ref->e.expr.e1, base, offset,
mode);