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Use unordered_map instead of dict for IdString char* to index storage.

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dict is pretty slow when you don't ever need to iterate the container in
order.  And the hashfunction for char* in dict hashes for every single
byte in the string, likely doing significantly more work than std::hash.
This commit is contained in:
Drew Lewis 2025-07-22 19:49:10 +00:00 • committed by Emil J. Tywoniak
parent 8f6d7a3043
commit 2c8b4d7ad1
2 changed files with 5 additions and 2 deletions
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2
kernel/rtlil.cc
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@ -35,7 +35,7 @@ YOSYS_NAMESPACE_BEGIN
bool RTLIL::IdString::destruct_guard_ok = false;
RTLIL::IdString::destruct_guard_t RTLIL::IdString::destruct_guard;
std::vector<char*> RTLIL::IdString::global_id_storage_;
dict<char*, int> RTLIL::IdString::global_id_index_;
std::unordered_map<std::string_view, int> RTLIL::IdString::global_id_index_;
#ifndef YOSYS_NO_IDS_REFCNT
std::vector<int> RTLIL::IdString::global_refcount_storage_;
std::vector<int> RTLIL::IdString::global_free_idx_list_;

5
kernel/rtlil.h
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@ -23,6 +23,9 @@
#include "kernel/yosys_common.h"
#include "kernel/yosys.h"
#include <string_view>
#include <unordered_map>
YOSYS_NAMESPACE_BEGIN
namespace RTLIL
@ -122,7 +125,7 @@ struct RTLIL::IdString
} destruct_guard;
static std::vector<char*> global_id_storage_;
static dict<char*, int> global_id_index_;
static std::unordered_map<std::string_view, int> global_id_index_;
#ifndef YOSYS_NO_IDS_REFCNT
static std::vector<int> global_refcount_storage_;
static std::vector<int> global_free_idx_list_;