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[qfcc] Propagate negations above aliases

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No change to the generated code, but this does get negations up as close
to extends (and final sums) as possible.
This commit is contained in:
Bill Currie 2023-09-02 13:43:22 +09:00
parent 4135849903
commit f3a1239095
1 changed files with 37 additions and 22 deletions
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59
tools/qfcc/source/expr_algebra.c
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@ -59,11 +59,44 @@ get_group (type_t *type, algebra_t *algebra)
return BITOP_LOG2 (group_mask);
}
static bool __attribute__((const))
is_neg (const expr_t *e)
{
return e->type == ex_uexpr && e->e.expr.op == '-';
}
static expr_t *
neg_expr (expr_t *e)
{
if (is_neg (e)) {
return e->e.expr.e1;
}
auto type = get_type (e);
e = new_unary_expr ('-', e);
e->e.expr.type = type;
return e;
}
static expr_t *
alias_expr (type_t *type, expr_t *e, int offset)
{
bool neg = false;
if (is_neg (e)) {
neg = true;
e = neg_expr (e);
}
e = new_offset_alias_expr (type, e, offset);
if (neg) {
e = neg_expr (e);
}
return e;
}
static expr_t *
offset_cast (type_t *type, expr_t *expr, int offset)
{
offset *= type_size (base_type (get_type (expr)));
return new_offset_alias_expr (type, expr, offset);
return alias_expr (type, expr, offset);
}
static symbol_t *
@ -295,24 +328,6 @@ sum_expr (type_t *type, expr_t *a, expr_t *b)
return sum;
}
static bool __attribute__((const))
is_neg (const expr_t *e)
{
return e->type == ex_uexpr && e->e.expr.op == '-';
}
static expr_t *
neg_expr (expr_t *e)
{
if (is_neg (e)) {
return e->e.expr.e1;
}
auto type = get_type (e);
e = new_unary_expr ('-', e);
e->e.expr.type = type;
return e;
}
static expr_t *
scale_expr (type_t *type, expr_t *a, expr_t *b)
{
@ -1385,7 +1400,7 @@ pga2_yw_wx_xy_geom_yw_wx_xy (expr_t **c, expr_t *a, expr_t *b, algebra_t *alg)
auto geom_type = algebra_mvec_type (alg, 0x01);
auto sa = offset_cast (stype, a, 2);
auto sb = offset_cast (stype, b, 2);
auto cv = new_offset_alias_expr (ctype, cross_expr (vtype, b, a), 0);
auto cv = alias_expr (ctype, cross_expr (vtype, b, a), 0);
c[0] = new_extend_expr (cv, geom_type, 0, false);
c[1] = neg_expr (scale_expr (algebra_mvec_type (alg, 0x02), sa, sb));
@ -1788,7 +1803,7 @@ algebra_cast_expr (type_t *dstType, expr_t *e)
static void
zero_components (expr_t *block, expr_t *dst, int memset_base, int memset_size)
{
auto base = new_offset_alias_expr (&type_int, dst, memset_base);
auto base = alias_expr (&type_int, dst, memset_base);
auto zero = new_int_expr (0);
auto size = new_int_expr (memset_size);
append_expr (block, new_memset_expr (base, zero, size));
@ -1829,7 +1844,7 @@ algebra_assign_expr (expr_t *dst, expr_t *src)
if (size) {
zero_components (block, dst, memset_base, size);
}
auto dst_alias = new_offset_alias_expr (sym->type, dst, sym->s.offset);
auto dst_alias = alias_expr (sym->type, dst, sym->s.offset);
append_expr (block, new_assign_expr (dst_alias, components[i]));
memset_base = sym->s.offset + type_size (sym->type);
}