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[qfcc] Convert summed extends to simple assignments

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This knocked off another 6 instructions total :) The remaining
optimizations require better detection of products that unconditionally
produce 0.
This commit is contained in:
Bill Currie 2023-09-02 20:35:10 +09:00
parent b514bbdb44
commit 5af1bf54f0
1 changed files with 26 additions and 5 deletions
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31
tools/qfcc/source/expr_algebra.c
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@ -1930,6 +1930,12 @@ zero_components (expr_t *block, expr_t *dst, int memset_base, int memset_size)
append_expr (block, new_memset_expr (base, zero, size));
}
static int __attribute__((const))
find_offset (const type_t *t1, const type_t *t2)
{
return type_width (t1) - type_width (t2);
}
expr_t *
algebra_assign_expr (expr_t *dst, expr_t *src)
{
@ -1947,18 +1953,18 @@ algebra_assign_expr (expr_t *dst, expr_t *src)
}
auto algebra = algebra_get (dstType);
auto layout = &algebra->layout;
expr_t *components[layout->count] = {};
expr_t *c[layout->count] = {};
src = mvec_expr (src, algebra);
mvec_scatter (components, src, algebra);
mvec_scatter (c, src, algebra);
auto sym = get_mvec_sym (dstType);
auto block = new_block_expr ();
int memset_base = 0;
for (int i = 0; i < layout->count; i++) {
if (!components[i]) {
if (!c[i]) {
continue;
}
while (sym->type != get_type (components[i])) {
while (sym->type != get_type (c[i])) {
sym = sym->next;
}
int size = sym->s.offset - memset_base;
@ -1966,7 +1972,22 @@ algebra_assign_expr (expr_t *dst, expr_t *src)
zero_components (block, dst, memset_base, size);
}
auto dst_alias = new_offset_alias_expr (sym->type, dst, sym->s.offset);
append_expr (block, new_assign_expr (dst_alias, components[i]));
if (c[i]->type == ex_expr && c[i]->e.expr.op == '+'
&& c[i]->e.expr.e1->type == ex_extend
&& c[i]->e.expr.e2->type == ex_extend) {
auto ext1 = c[i]->e.expr.e1->e.extend;
auto ext2 = c[i]->e.expr.e2->e.extend;
auto type1 = get_type (ext1.src);
auto type2 = get_type (ext2.src);
int offs1 = ext1.reverse ? find_offset (ext1.type, type1) : 0;
int offs2 = ext2.reverse ? find_offset (ext2.type, type2) : 0;
auto dst1 = offset_cast (type1, dst_alias, offs1);
auto dst2 = offset_cast (type2, dst_alias, offs2);
append_expr (block, new_assign_expr (dst1, ext1.src));
append_expr (block, new_assign_expr (dst2, ext2.src));
} else {
append_expr (block, new_assign_expr (dst_alias, c[i]));
}
memset_base = sym->s.offset + type_size (sym->type);
}
if (type_size (dstType) - memset_base) {