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[qfcc] Aggressively cancel terms

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While it currently doesn't have any effect on generated code, it proved
to be necessary when experimenting with optimizing the operand of extend
expressions (which proved to produce worse code).

Along with some 0 -> nullptr changes.
This commit is contained in:
Bill Currie 2024-04-07 01:10:54 +09:00
parent 4daa84ed2a
commit 95a50fefa2
2 changed files with 29 additions and 7 deletions
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2
tools/qfcc/source/expr_algebra.c
View file

@ -135,7 +135,7 @@ const expr_t *
ext_expr (const expr_t *src, const type_t *type, int extend, bool reverse)
{
if (!src) {
return 0;
return nullptr;
}
bool neg = false;
if (is_neg (src)) {

34
tools/qfcc/source/expr_optimize.c
View file

@ -53,7 +53,7 @@ clean_skips (const expr_t **expr_list)
*dst++ = *src;
}
}
*dst = 0;
*dst = nullptr;
}
static const expr_t *
@ -149,7 +149,7 @@ optimize_cross (const expr_t *expr, const expr_t **adds, const expr_t **subs)
for (auto search = adds; *search; search++) {
if (*search != &skip) {
auto c = traverse_scale (*search);
const expr_t *scale = 0;
const expr_t *scale = nullptr;
bool neg = false;
if (is_cross (c)) {
if (c->expr.e1 == com) {
@ -173,7 +173,7 @@ optimize_cross (const expr_t *expr, const expr_t **adds, const expr_t **subs)
for (auto search = subs; *search; search++) {
if (*search != &skip) {
auto c = traverse_scale (*search);
const expr_t *scale = 0;
const expr_t *scale = nullptr;
bool neg = false;
if (is_cross (c)) {
if (c->expr.e1 == com) {
@ -282,7 +282,7 @@ optimize_scale (const expr_t *expr, const expr_t **adds, const expr_t **subs)
return expr;
}
const expr_t *common = 0;
const expr_t *common = nullptr;
int count = 0;
for (auto f = factors; *f; f++) {
if (fac_counts[f - factors] > count
@ -357,7 +357,7 @@ optimize_mult (const expr_t *expr, const expr_t **adds, const expr_t **subs)
return expr;
}
const expr_t *common = 0;
const expr_t *common = nullptr;
int count = 0;
for (auto f = factors; *f; f++) {
if (fac_counts[f - factors] > count
@ -387,7 +387,9 @@ optimize_mult (const expr_t *expr, const expr_t **adds, const expr_t **subs)
auto type = get_type (expr);
auto col = gather_terms (type, com_adds, com_subs);
col = optimize_core (col);
if (!(col = optimize_core (col))) {
return nullptr;
}
auto mult = typed_binary_expr (type, expr->expr.op, col, common);
mult = edag_add_expr (mult);
@ -537,6 +539,25 @@ optimize_adds (const expr_t **expr_list)
clean_skips (expr_list);
}
static void
cancel_terms (const expr_t **adds, const expr_t **subs)
{
for (auto a = adds; *a; a++) {
if (*a == &skip) {
continue;
}
for (auto s = subs; *s; s++) {
if (*s == *a) {
*a = &skip;
*s = &skip;
break;
}
}
}
clean_skips (adds);
clean_skips (subs);
}
static const expr_t *
optimize_core (const expr_t *expr)
{
@ -553,6 +574,7 @@ optimize_core (const expr_t *expr)
if (expr->expr.commutative) {
optimize_adds (adds);
optimize_adds (subs);
cancel_terms (adds, subs);
}
optimize_cross_products (adds, subs);