From 55bdf90f60d72b2c3278edcc693b2e12425ba421 Mon Sep 17 00:00:00 2001
From: "bmeurer@chromium.org" <bmeurer@chromium.org>
Date: Mon, 20 Oct 2014 12:37:48 +0000
Subject: [PATCH] Drop obsolete misc-intrinsics.h file.

R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/648643003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24742 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
---
 src/misc-intrinsics.h          | 66 ------------------------------------------
 src/runtime/runtime-numbers.cc |  6 ++--
 2 files changed, 3 insertions(+), 69 deletions(-)
 delete mode 100644 src/misc-intrinsics.h

diff --git a/src/misc-intrinsics.h b/src/misc-intrinsics.h
deleted file mode 100644
index 5256a29..0000000
--- a/src/misc-intrinsics.h
+++ /dev/null
@@ -1,66 +0,0 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef V8_MISC_INTRINSICS_H_
-#define V8_MISC_INTRINSICS_H_
-
-#include "include/v8.h"
-#include "src/globals.h"
-
-namespace v8 {
-namespace internal {
-
-// Returns the index of the leading 1 bit, counting the least significant bit at
-// index 0.  (1 << IntegerLog2(x)) is a mask for the most significant bit of x.
-// Result is undefined if input is zero.
-int IntegerLog2(uint32_t value);
-
-#if defined(__GNUC__)
-
-inline int IntegerLog2(uint32_t value) {
-  return 31 - __builtin_clz(value);
-}
-
-#elif defined(_MSC_VER)
-
-#pragma intrinsic(_BitScanReverse)
-
-inline int IntegerLog2(uint32_t value) {
-  unsigned long result;             // NOLINT: MSVC intrinsic demands this type.
-  _BitScanReverse(&result, value);
-  return result;
-}
-
-#else
-
-// Default version using regular operations. Code taken from:
-// http://graphics.stanford.edu/~seander/bithacks.html#IntegerLog
-inline int IntegerLog2(uint32_t value) {
-  int result, shift;
-
-  shift = (value > 0xFFFF) << 4;
-  value >>= shift;
-  result = shift;
-
-  shift = (value > 0xFF) << 3;
-  value >>= shift;
-  result |= shift;
-
-  shift = (value > 0xF) << 2;
-  value >>= shift;
-  result |= shift;
-
-  shift = (value > 0x3) << 1;
-  value >>= shift;
-  result |= shift;
-
-  result |= (value >> 1);
-
-  return result;
-}
-#endif
-
-} }  // namespace v8::internal
-
-#endif  // V8_MISC_INTRINSICS_H_
diff --git a/src/runtime/runtime-numbers.cc b/src/runtime/runtime-numbers.cc
index 7953dac..5e645be 100644
--- a/src/runtime/runtime-numbers.cc
+++ b/src/runtime/runtime-numbers.cc
@@ -5,9 +5,9 @@
 #include "src/v8.h"
 
 #include "src/arguments.h"
+#include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
-#include "src/misc-intrinsics.h"
 #include "src/runtime/runtime-utils.h"
 
 
@@ -525,11 +525,11 @@ RUNTIME_FUNCTION(Runtime_SmiLexicographicCompare) {
   // integer comes first in the lexicographic order.
 
   // From http://graphics.stanford.edu/~seander/bithacks.html#IntegerLog10
-  int x_log2 = IntegerLog2(x_scaled);
+  int x_log2 = 31 - base::bits::CountLeadingZeros32(x_scaled);
   int x_log10 = ((x_log2 + 1) * 1233) >> 12;
   x_log10 -= x_scaled < kPowersOf10[x_log10];
 
-  int y_log2 = IntegerLog2(y_scaled);
+  int y_log2 = 31 - base::bits::CountLeadingZeros32(y_scaled);
   int y_log10 = ((y_log2 + 1) * 1233) >> 12;
   y_log10 -= y_scaled < kPowersOf10[y_log10];
 
-- 
2.7.4