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Minor optimisations in select.cc's match_ids function

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- Pass a string argument by reference

  - Avoid multiple calls to IdString::str and IdString::c_str

  - Avoid combining checks for size > 0 and first char (C strings are
    null terminated, so foo[0] != '\0' implies that foo has positive
    length)
This commit is contained in:
Rupert Swarbrick 2020-05-27 09:36:33 +01:00
parent 0d9beb5b2e
commit 061d1f0c07
1 changed files with 11 additions and 9 deletions
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20
passes/cmds/select.cc
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@ -30,22 +30,24 @@ using RTLIL::id2cstr;
static std::vector<RTLIL::Selection> work_stack;
static bool match_ids(RTLIL::IdString id, std::string pattern)
static bool match_ids(RTLIL::IdString id, const std::string &pattern)
{
if (id == pattern)
return true;
const char *id_c = id.c_str();
if (*id_c == '\\' &&
id.size() == 1 + pattern.size() &&
memcmp(id_c + 1, pattern.c_str(), pattern.size()) == 0)
const char *pat_c = pattern.c_str();
size_t id_size = strlen(id_c);
size_t pat_size = pattern.size();
if (*id_c == '\\' && id_size == 1 + pat_size && memcmp(id_c + 1, pat_c, pat_size) == 0)
return true;
if (patmatch(pattern.c_str(), id.c_str()))
if (patmatch(pat_c, id_c))
return true;
if (id.size() > 0 && id[0] == '\\' && patmatch(pattern.c_str(), id.substr(1).c_str()))
if (*id_c == '\\' && patmatch(pat_c, id_c + 1))
return true;
if (id.size() > 0 && id[0] == '$' && pattern.size() > 0 && pattern[0] == '$') {
const char *p = id.c_str();
const char *q = strrchr(p, '$');
if (*id_c == '$' && *pat_c == '$') {
const char *q = strrchr(id_c, '$');
if (pattern == q)
return true;
}