From ff4bfb1553cf525d7299bbf7451ac32cfd97ae1b Mon Sep 17 00:00:00 2001
From: Jonathan Wakely <jwakely@redhat.com>
Date: Mon, 9 Nov 2020 14:31:13 +0000
Subject: [PATCH] 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.
---
 libstdc++-v3/include/std/bit | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/libstdc++-v3/include/std/bit b/libstdc++-v3/include/std/bit
index f434482..16f7eba 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;
-- 
2.7.4