From bf883e6428a545d091319c8b71fcfb35e7dd7084 Mon Sep 17 00:00:00 2001 From: Jonathan Wakely Date: Thu, 8 Feb 2024 15:47:19 +0000 Subject: [PATCH] libstdc++: Remove redundant zeroing in std::bitset::operator>>= [PR113806] The unused bits in the high word are already zero before this operation. Shifting the used bits to the right cannot affect the unused bits, so we don't need to sanitize them. libstdc++-v3/ChangeLog: PR libstdc++/113806 * include/std/bitset (bitset::operator>>=): Remove redundant call to _M_do_sanitize. --- libstdc++-v3/include/std/bitset | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/libstdc++-v3/include/std/bitset b/libstdc++-v3/include/std/bitset index 16c4040f532f..ccd6d19f7a40 100644 --- a/libstdc++-v3/include/std/bitset +++ b/libstdc++-v3/include/std/bitset @@ -1094,10 +1094,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER operator>>=(size_t __position) _GLIBCXX_NOEXCEPT { if (__builtin_expect(__position < _Nb, 1)) - { - this->_M_do_right_shift(__position); - this->_M_do_sanitize(); - } + this->_M_do_right_shift(__position); else this->_M_do_reset(); return *this; -- 2.47.2