Push version 2.1.3 to trunk.
Added API method for context-disposal notifications.
Added API method for accessing elements by integer index.
Added missing implementation of Uint32::Value and Value::IsUint32 API methods.
Added IsExecutionTerminating API method.
Disabled strict aliasing for GCC 4.4.
Fixed string-concatenation bug (issue 636).
Performance improvements on all platforms.
git-svn-id: http://v8.googlecode.com/svn/trunk@4079 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
diff --git a/src/utils.h b/src/utils.h
index 2fcd241..deab09f 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -528,11 +528,11 @@
sinkchar* limit = dest + chars;
#ifdef V8_HOST_CAN_READ_UNALIGNED
if (sizeof(*dest) == sizeof(*src)) {
- // Number of characters in a uint32_t.
- static const int kStepSize = sizeof(uint32_t) / sizeof(*dest); // NOLINT
+ // Number of characters in a uintptr_t.
+ static const int kStepSize = sizeof(uintptr_t) / sizeof(*dest); // NOLINT
while (dest <= limit - kStepSize) {
- *reinterpret_cast<uint32_t*>(dest) =
- *reinterpret_cast<const uint32_t*>(src);
+ *reinterpret_cast<uintptr_t*>(dest) =
+ *reinterpret_cast<const uintptr_t*>(src);
dest += kStepSize;
src += kStepSize;
}
@@ -544,6 +544,58 @@
}
+// Compare ASCII/16bit chars to ASCII/16bit chars.
+template <typename lchar, typename rchar>
+static inline int CompareChars(const lchar* lhs, const rchar* rhs, int chars) {
+ const lchar* limit = lhs + chars;
+#ifdef V8_HOST_CAN_READ_UNALIGNED
+ if (sizeof(*lhs) == sizeof(*rhs)) {
+ // Number of characters in a uintptr_t.
+ static const int kStepSize = sizeof(uintptr_t) / sizeof(*lhs); // NOLINT
+ while (lhs <= limit - kStepSize) {
+ if (*reinterpret_cast<const uintptr_t*>(lhs) !=
+ *reinterpret_cast<const uintptr_t*>(rhs)) {
+ break;
+ }
+ lhs += kStepSize;
+ rhs += kStepSize;
+ }
+ }
+#endif
+ while (lhs < limit) {
+ int r = static_cast<int>(*lhs) - static_cast<int>(*rhs);
+ if (r != 0) return r;
+ ++lhs;
+ ++rhs;
+ }
+ return 0;
+}
+
+
+template <typename T>
+static inline void MemsetPointer(T** dest, T* value, int counter) {
+#if defined(V8_HOST_ARCH_IA32)
+#define STOS "stosl"
+#elif defined(V8_HOST_ARCH_X64)
+#define STOS "stosq"
+#endif
+
+#if defined(__GNUC__) && defined(STOS)
+ asm("cld;"
+ "rep ; " STOS
+ : /* no output */
+ : "c" (counter), "a" (value), "D" (dest)
+ : /* no clobbered list as all inputs are considered clobbered */);
+#else
+ for (int i = 0; i < counter; i++) {
+ dest[i] = value;
+ }
+#endif
+
+#undef STOS
+}
+
+
// Calculate 10^exponent.
int TenToThe(int exponent);