#ifndef LLVM_SUPPORT_MATHEXTRAS_H
#define LLVM_SUPPORT_MATHEXTRAS_H
-#include "llvm/Support/DataTypes.h"
+#include "llvm/System/DataTypes.h"
+#include "llvm/System/SwapByteOrder.h"
namespace llvm {
return static_cast<uint32_t>(Value);
}
-/// is?Type - these functions produce optimal testing for integer data types.
-inline bool isInt8 (int64_t Value) {
- return static_cast<int8_t>(Value) == Value;
+/// isInt - Checks if an integer fits into the given bit width.
+template<unsigned N>
+inline bool isInt(int64_t x) {
+ return N >= 64 || (-(INT64_C(1)<<(N-1)) <= x && x < (INT64_C(1)<<(N-1)));
}
-inline bool isUInt8 (int64_t Value) {
- return static_cast<uint8_t>(Value) == Value;
+// Template specializations to get better code for common cases.
+template<>
+inline bool isInt<8>(int64_t x) {
+ return static_cast<int8_t>(x) == x;
}
-inline bool isInt16 (int64_t Value) {
- return static_cast<int16_t>(Value) == Value;
+template<>
+inline bool isInt<16>(int64_t x) {
+ return static_cast<int16_t>(x) == x;
}
-inline bool isUInt16(int64_t Value) {
- return static_cast<uint16_t>(Value) == Value;
+template<>
+inline bool isInt<32>(int64_t x) {
+ return static_cast<int32_t>(x) == x;
}
-inline bool isInt32 (int64_t Value) {
- return static_cast<int32_t>(Value) == Value;
+
+/// isUInt - Checks if an unsigned integer fits into the given bit width.
+template<unsigned N>
+inline bool isUInt(uint64_t x) {
+ return N >= 64 || x < (UINT64_C(1)<<N);
+}
+// Template specializations to get better code for common cases.
+template<>
+inline bool isUInt<8>(uint64_t x) {
+ return static_cast<uint8_t>(x) == x;
}
-inline bool isUInt32(int64_t Value) {
- return static_cast<uint32_t>(Value) == Value;
+template<>
+inline bool isUInt<16>(uint64_t x) {
+ return static_cast<uint16_t>(x) == x;
+}
+template<>
+inline bool isUInt<32>(uint64_t x) {
+ return static_cast<uint32_t>(x) == x;
}
/// isMask_32 - This function returns true if the argument is a sequence of ones
/// ByteSwap_16 - This function returns a byte-swapped representation of the
/// 16-bit argument, Value.
inline uint16_t ByteSwap_16(uint16_t Value) {
-#if defined(_MSC_VER) && !defined(_DEBUG)
- // The DLL version of the runtime lacks these functions (bug!?), but in a
- // release build they're replaced with BSWAP instructions anyway.
- return _byteswap_ushort(Value);
-#else
- uint16_t Hi = Value << 8;
- uint16_t Lo = Value >> 8;
- return Hi | Lo;
-#endif
+ return sys::SwapByteOrder(Value);
}
/// ByteSwap_32 - This function returns a byte-swapped representation of the
/// 32-bit argument, Value.
inline uint32_t ByteSwap_32(uint32_t Value) {
-#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
- return __builtin_bswap32(Value);
-#elif defined(_MSC_VER) && !defined(_DEBUG)
- return _byteswap_ulong(Value);
-#else
- uint32_t Byte0 = Value & 0x000000FF;
- uint32_t Byte1 = Value & 0x0000FF00;
- uint32_t Byte2 = Value & 0x00FF0000;
- uint32_t Byte3 = Value & 0xFF000000;
- return (Byte0 << 24) | (Byte1 << 8) | (Byte2 >> 8) | (Byte3 >> 24);
-#endif
+ return sys::SwapByteOrder(Value);
}
/// ByteSwap_64 - This function returns a byte-swapped representation of the
/// 64-bit argument, Value.
inline uint64_t ByteSwap_64(uint64_t Value) {
-#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
- return __builtin_bswap64(Value);
-#elif defined(_MSC_VER) && !defined(_DEBUG)
- return _byteswap_uint64(Value);
-#else
- uint64_t Hi = ByteSwap_32(uint32_t(Value));
- uint32_t Lo = ByteSwap_32(uint32_t(Value >> 32));
- return (Hi << 32) | Lo;
-#endif
+ return sys::SwapByteOrder(Value);
}
/// CountLeadingZeros_32 - this function performs the platform optimal form of
#else
if (!Value) return 32;
Count = 0;
- // bisecton method for count leading zeros
+ // bisection method for count leading zeros
for (unsigned Shift = 32 >> 1; Shift; Shift >>= 1) {
uint32_t Tmp = Value >> Shift;
if (Tmp) {
if (sizeof(long) == sizeof(int64_t)) {
if (!Value) return 64;
Count = 0;
- // bisecton method for count leading zeros
+ // bisection method for count leading zeros
for (unsigned Shift = 64 >> 1; Shift; Shift >>= 1) {
uint64_t Tmp = Value >> Shift;
if (Tmp) {
return ((Value + Align - 1) / Align) * Align;
}
+/// OffsetToAlignment - Return the offset to the next integer (mod 2**64) that
+/// is greater than or equal to \arg Value and is a multiple of \arg
+/// Align. Align must be non-zero.
+inline uint64_t OffsetToAlignment(uint64_t Value, uint64_t Align) {
+ return RoundUpToAlignment(Value, Align) - Value;
+}
+
/// abs64 - absolute value of a 64-bit int. Not all environments support
/// "abs" on whatever their name for the 64-bit int type is. The absolute
/// value of the largest negative number is undefined, as with "abs".
return (x < 0) ? -x : x;
}
+/// SignExtend32 - Sign extend B-bit number x to 32-bit int.
+/// Usage int32_t r = SignExtend32<5>(x);
+template <unsigned B> inline int32_t SignExtend32(uint32_t x) {
+ return int32_t(x << (32 - B)) >> (32 - B);
+}
+
+/// SignExtend64 - Sign extend B-bit number x to 64-bit int.
+/// Usage int64_t r = SignExtend64<5>(x);
+template <unsigned B> inline int64_t SignExtend64(uint64_t x) {
+ return int64_t(x << (64 - B)) >> (64 - B);
+}
+
} // End llvm namespace
#endif
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