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[qfcc] Support pointer arithmetic on arrays

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That is, `array + offset`. This actually works around the bug
highlighted by arraylife.r (because the array is explicitly used), but
is not a proper solution, so that test still fails of course. However,
with this, it's no longer necessary to use `&array[index]` instead of
`array + index`.
This commit is contained in:
Bill Currie 2023-05-14 12:39:11 +09:00
parent 8e1883a306
commit 4435db0329
2 changed files with 13 additions and 0 deletions
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8
tools/qfcc/source/expr_binary.c
View file

@ -1119,6 +1119,14 @@ binary_expr (int op, expr_t *e1, expr_t *e2)
t2 = &type_float; t2 = &type_float;
e2 = cast_expr (t2, e2); e2 = cast_expr (t2, e2);
} }
if (is_array (t1) && (is_ptr (t2) || is_integral (t2))) {
t1 = pointer_type (t1->t.array.type);
e1 = cast_expr (t1, e1);
}
if (is_array (t2) && (is_ptr (t1) || is_integral (t1))) {
t2 = pointer_type (t2->t.array.type);
e2 = cast_expr (t2, e2);
}
et1 = low_level_type (t1); et1 = low_level_type (t1);
et2 = low_level_type (t2); et2 = low_level_type (t2);

5
tools/qfcc/source/statements.c
View file

@ -677,6 +677,11 @@ expr_address (sblock_t *sblock, expr_t *e, operand_t **op)
lvalue->e.alias.expr, lvalue->e.alias.expr,
expr_int (offset)); expr_int (offset));
offset = 0; offset = 0;
} else if (offset && is_constant (offset)) {
int o = expr_int (offset);
if (o < 32768 && o >= -32768) {
offset = expr_file_line (new_short_expr (o), offset);
}
} }
s = new_statement (st_address, "lea", e); s = new_statement (st_address, "lea", e);