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Default struct member reordering for minimal size

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Rule: largest members to smallest; if same size, order in source order
This commit is contained in:
Ginger Bill
2016-09-10 11:24:50 +01:00
parent 6979678ff9
commit 7509cdceb8
7 changed files with 66 additions and 35 deletions
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src/codegen/ssa.cpp
+7 -4
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@@ -1875,26 +1875,29 @@ ssaValue *ssa_build_single_expr(ssaProcedure *proc, AstNode *expr, TypeAndValue
auto *st = &base_type->Record;
if (cl->elems != NULL && gb_array_count(cl->elems) > 0) {
gb_for_array(field_index, cl->elems) {
AstNode *elem = cl->elems[field_index];
isize index = field_index;
AstNode *elem = cl->elems[index];
ssaValue *field_expr = NULL;
Entity *field = NULL;
if (elem->kind == AstNode_FieldValue) {
ast_node(kv, FieldValue, elem);
Selection sel = lookup_field(base_type, kv->field->Ident.string, false);
field_index = sel.index[0];
index = sel.index[0];
field_expr = ssa_build_expr(proc, kv->value);
} else {
Selection sel = lookup_field(base_type, st->fields_in_src_order[field_index]->token.string, false);
index = sel.index[0];
field_expr = ssa_build_expr(proc, elem);
}
GB_ASSERT(ssa_type(field_expr)->kind != Type_Tuple);
field = st->fields[field_index];
field = st->fields[index];
Type *ft = field->type;
ssaValue *fv = ssa_emit_conv(proc, field_expr, ft);
ssaValue *gep = ssa_emit_struct_gep(proc, v, field_index, ft);
ssaValue *gep = ssa_emit_struct_gep(proc, v, index, ft);
ssa_emit_store(proc, gep, fv);
}
}