From 2ff3eb454d180c24cd6675acad4bc7b8b1b4262f Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Fri, 21 Jan 2022 23:53:44 +0100
Subject: [PATCH] bpo-29882: _Py_popcount32() doesn't need 64x64 multiply

32x32 bits multiply is enough for _Py_popcount32().
---
 Include/internal/pycore_bitutils.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Include/internal/pycore_bitutils.h b/Include/internal/pycore_bitutils.h
index e4aa7a3d0d0567..3fd70b0e417c19 100644
--- a/Include/internal/pycore_bitutils.h
+++ b/Include/internal/pycore_bitutils.h
@@ -125,7 +125,7 @@ _Py_popcount32(uint32_t x)
     // Put count of each 8 bits into those 8 bits
     x = (x + (x >> 4)) & M4;
     // Sum of the 4 byte counts
-    return (uint32_t)((uint64_t)x * (uint64_t)SUM) >> 24;
+    return (x * SUM) >> 24;
 #endif
 }