* [committed] libstdc++: Remove redundant check for zero in std::__popcount
@ 2020-11-09 14:54 Jonathan Wakely
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From: Jonathan Wakely @ 2020-11-09 14:54 UTC (permalink / raw)
To: libstdc++, gcc-patches
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The popcount built-ins work fine for zero, so there's no need to check
for it.
libstdc++-v3/ChangeLog:
* include/std/bit (__popcount): Remove redundant check for zero.
Tested x86_64-linux. Committed to trunk.
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commit ff4bfb1553cf525d7299bbf7451ac32cfd97ae1b
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Mon Nov 9 14:31:13 2020
libstdc++: Remove redundant check for zero in std::__popcount
The popcount built-ins work fine for zero, so there's no need to check
for it.
libstdc++-v3/ChangeLog:
* include/std/bit (__popcount): Remove redundant check for zero.
diff --git a/libstdc++-v3/include/std/bit b/libstdc++-v3/include/std/bit
index f4344820d527..16f7eba46d7b 100644
--- a/libstdc++-v3/include/std/bit
+++ b/libstdc++-v3/include/std/bit
@@ -184,9 +184,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
using __gnu_cxx::__int_traits;
constexpr auto _Nd = __int_traits<_Tp>::__digits;
- if (__x == 0)
- return 0;
-
constexpr auto _Nd_ull = __int_traits<unsigned long long>::__digits;
constexpr auto _Nd_ul = __int_traits<unsigned long>::__digits;
constexpr auto _Nd_u = __int_traits<unsigned>::__digits;
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2020-11-09 14:54 [committed] libstdc++: Remove redundant check for zero in std::__popcount Jonathan Wakely
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