[lldb] Remove SetCount/ClearCount from Flags

Summary:
These functions are only used in tests where we should test the actual flag values instead of counting all bits for an approximate check.
Also these popcount implementation aren't very efficient and doesn't seem to be optimised to anything fast.

Reviewers: davide, JDevlieghere

Reviewed By: davide, JDevlieghere

Subscribers: abidh, JDevlieghere, lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D67540

llvm-svn: 372018

Author: Teemperor

lldb/include/lldb/Utility/Flags.h

@@ -121,32 +121,6 @@ class Flags {
   ///     \b true if \a bit is 0, \b false otherwise.
   bool IsClear(ValueType bit) const { return (m_flags & bit) == 0; }
 
-  /// Get the number of zero bits in \a m_flags.
-  ///
-  /// \return
-  ///     The number of bits that are set to 0 in the current flags.
-  size_t ClearCount() const {
-    size_t count = 0;
-    for (ValueType shift = 0; shift < sizeof(ValueType) * 8; ++shift) {
-      if ((m_flags & (1u << shift)) == 0)
-        ++count;
-    }
-    return count;
-  }
-
-  /// Get the number of one bits in \a m_flags.
-  ///
-  /// \return
-  ///     The number of bits that are set to 1 in the current flags.
-  size_t SetCount() const {
-    size_t count = 0;
-    for (ValueType mask = m_flags; mask; mask >>= 1) {
-      if (mask & 1u)
-        ++count;
-    }
-    return count;
-  }
-
 protected:
   ValueType m_flags; ///< The flags.
 };

lldb/unittests/Utility/FlagsTest.cpp

@@ -30,19 +30,18 @@ TEST(Flags, Reset) {
   Flags f;
   f.Reset(0x3);
   EXPECT_EQ(0x3U, f.Get());
-  EXPECT_EQ(2U, f.SetCount());
 }
 
 TEST(Flags, Clear) {
   Flags f;
   f.Reset(0x3);
-  EXPECT_EQ(2U, f.SetCount());
+  EXPECT_EQ(0x3U, f.Get());
 
   f.Clear(0x5);
-  EXPECT_EQ(1U, f.SetCount());
+  EXPECT_EQ(0x2U, f.Get());
 
   f.Clear();
-  EXPECT_EQ(0U, f.SetCount());
+  EXPECT_EQ(0x0U, f.Get());
 }
 
 TEST(Flags, AllSet) {
@@ -162,37 +161,3 @@ TEST(Flags, IsClear) {
   EXPECT_TRUE(f.IsClear(eFlag0));
   EXPECT_TRUE(f.IsClear(eFlag1));
 }
-
-TEST(Flags, ClearCount) {
-  Flags f;
-  EXPECT_EQ(32U, f.ClearCount());
-
-  f.Set(eFlag0);
-  EXPECT_EQ(31U, f.ClearCount());
-
-  f.Set(eFlag0);
-  EXPECT_EQ(31U, f.ClearCount());
-
-  f.Set(eFlag1);
-  EXPECT_EQ(30U, f.ClearCount());
-
-  f.Set(eAllFlags);
-  EXPECT_EQ(29U, f.ClearCount());
-}
-
-TEST(Flags, SetCount) {
-  Flags f;
-  EXPECT_EQ(0U, f.SetCount());
-
-  f.Set(eFlag0);
-  EXPECT_EQ(1U, f.SetCount());
-
-  f.Set(eFlag0);
-  EXPECT_EQ(1U, f.SetCount());
-
-  f.Set(eFlag1);
-  EXPECT_EQ(2U, f.SetCount());
-
-  f.Set(eAllFlags);
-  EXPECT_EQ(3U, f.SetCount());
-}