Revision: 24742
Author: [email protected]
Date: Mon Oct 20 12:37:48 2014 UTC
Log: Drop obsolete misc-intrinsics.h file.
[email protected]
Review URL: https://codereview.chromium.org/648643003
https://code.google.com/p/v8/source/detail?r=24742
Deleted:
/branches/bleeding_edge/src/misc-intrinsics.h
Modified:
/branches/bleeding_edge/src/runtime/runtime-numbers.cc
=======================================
--- /branches/bleeding_edge/src/misc-intrinsics.h Tue Jun 3 08:12:43 2014
UTC
+++ /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_
=======================================
--- /branches/bleeding_edge/src/runtime/runtime-numbers.cc Mon Oct 20
12:07:45 2014 UTC
+++ /branches/bleeding_edge/src/runtime/runtime-numbers.cc Mon Oct 20
12:37:48 2014 UTC
@@ -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 @@
// 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];
--
--
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