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| author | Jonathan Wakely <jwakely@redhat.com> | 2022-09-23 13:39:31 +0100 |
|---|---|---|
| committer | Jonathan Wakely <jwakely@redhat.com> | 2022-09-23 15:10:51 +0100 |
| commit | ab98b4c0725eb7c0f03d319ef3e22ae761b2698a (patch) | |
| tree | c1e1d9c403b91572307e00582075fe600192ec16 | |
| parent | af611afe5fcc908a6678b5b205fb5af7d64fbcb2 (diff) | |
| download | gcc-ab98b4c0725eb7c0f03d319ef3e22ae761b2698a.zip gcc-ab98b4c0725eb7c0f03d319ef3e22ae761b2698a.tar.gz gcc-ab98b4c0725eb7c0f03d319ef3e22ae761b2698a.tar.bz2 | |
libstdc++: Micro-optimizaion for std::bitset stream extraction
Don't bother trying to copy any characters for bitset<0>.
libstdc++-v3/ChangeLog:
* include/std/bitset (operator>>): Do not copy for N==0.
* testsuite/20_util/bitset/io/input.cc: Add comment.
| -rw-r--r-- | libstdc++-v3/include/std/bitset | 2 | ||||
| -rw-r--r-- | libstdc++-v3/testsuite/20_util/bitset/io/input.cc | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/libstdc++-v3/include/std/bitset b/libstdc++-v3/include/std/bitset index 83c6416..6dbc58c 100644 --- a/libstdc++-v3/include/std/bitset +++ b/libstdc++-v3/include/std/bitset @@ -1615,7 +1615,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER if (__tmp.empty() && _Nb) __state |= __ios_base::failbit; - else + else if _GLIBCXX17_CONSTEXPR (_Nb) __x._M_copy_from_string(__tmp, static_cast<size_t>(0), _Nb, __zero, __one); if (__state) diff --git a/libstdc++-v3/testsuite/20_util/bitset/io/input.cc b/libstdc++-v3/testsuite/20_util/bitset/io/input.cc index 939861b..0f22cef 100644 --- a/libstdc++-v3/testsuite/20_util/bitset/io/input.cc +++ b/libstdc++-v3/testsuite/20_util/bitset/io/input.cc @@ -39,7 +39,7 @@ void test01() ss.clear(); ss.str("*"); ss >> b0; - VERIFY( ss.rdstate() == ios_base::goodbit ); + VERIFY( ss.rdstate() == ios_base::goodbit ); // LWG 3199 } int main() |