From 67828056ddfcfe089f9b5448839137508e39ac32 Mon Sep 17 00:00:00 2001
From: Aaron Ballman <aaron@aaronballman.com>
Date: Thu, 17 Jan 2013 18:27:30 +0000
Subject: [PATCH] Reverting back to the fallback instead of using popcnt; this
 instruction doesn't exist on all CPU architectures.  Fixes PR14982

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172734 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Support/MathExtras.h | 2 --
 1 file changed, 2 deletions(-)

diff --git a/include/llvm/Support/MathExtras.h b/include/llvm/Support/MathExtras.h
index b8631a56970..340b7741b1b 100644
--- a/include/llvm/Support/MathExtras.h
+++ b/include/llvm/Support/MathExtras.h
@@ -303,8 +303,6 @@ inline unsigned CountTrailingOnes_64(uint64_t Value) {
 inline unsigned CountPopulation_32(uint32_t Value) {
 #if __GNUC__ >= 4
   return __builtin_popcount(Value);
-#elif defined(_MSC_VER)
-  return __popcnt(Value);
 #else
   uint32_t v = Value - ((Value >> 1) & 0x55555555);
   v = (v & 0x33333333) + ((v >> 2) & 0x33333333);