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improves instruction decoding by avoiding copying, replaces .size()

This commit is contained in:
Eyck-Alexander Jentzsch 2024-07-24 08:54:37 +02:00
parent 0d6bf924ed
commit b1306c3a47
1 changed files with 4 additions and 6 deletions
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10
src/vm/instruction_decoder.cpp
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@ -85,15 +85,13 @@ void decoder::populate_decoding_tree(decoding_tree_node& parent) {
} }
uint32_t decoder::decode_instr(uint32_t word) { return _decode_instr(this->root, word); } uint32_t decoder::decode_instr(uint32_t word) { return _decode_instr(this->root, word); }
uint32_t decoder::_decode_instr(decoding_tree_node const& node, uint32_t word) { uint32_t decoder::_decode_instr(decoding_tree_node const& node, uint32_t word) {
if(!node.children.size()) { if(!node.instrs.empty()) {
if(node.instrs.size() == 1) for(auto& instr : node.instrs) {
return node.instrs[0].index;
for(auto instr : node.instrs) {
if((instr.mask & word) == instr.value) if((instr.mask & word) == instr.value)
return instr.index; return instr.index;
} }
} else { } else if(!node.children.empty()) {
for(auto child : node.children) { for(auto& child : node.children) {
if(child.value == (node.submask & word)) { if(child.value == (node.submask & word)) {
return _decode_instr(child, word); return _decode_instr(child, word);
} }