X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FSupport%2FMathExtras.h;h=11f9e63c9bbcafa849f49177c20d9ecafc4d01d7;hb=b09c146b116359616f6cbd4c8b3328607e00ff42;hp=773fbf954f411c31a6833e5fb5f3aa78055a3445;hpb=7ed47a13356daed2a34cd2209a31f92552e3bdd8;p=oota-llvm.git diff --git a/include/llvm/Support/MathExtras.h b/include/llvm/Support/MathExtras.h index 773fbf954f4..11f9e63c9bb 100644 --- a/include/llvm/Support/MathExtras.h +++ b/include/llvm/Support/MathExtras.h @@ -14,11 +14,11 @@ #ifndef LLVM_SUPPORT_MATHEXTRAS_H #define LLVM_SUPPORT_MATHEXTRAS_H -#include "llvm/Support/DataTypes.h" +#include "llvm/Support/SwapByteOrder.h" namespace llvm { -// NOTE: The following support functions use the _32/_64 extensions instead of +// NOTE: The following support functions use the _32/_64 extensions instead of // type overloading so that signed and unsigned integers can be used without // ambiguity. @@ -32,24 +32,68 @@ inline uint32_t Lo_32(uint64_t Value) { return static_cast(Value); } -/// is?Type - these functions produce optimal testing for integer data types. -inline bool isInt8 (int64_t Value) { - return static_cast(Value) == Value; +/// isInt - Checks if an integer fits into the given bit width. +template +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(Value) == Value; +// Template specializations to get better code for common cases. +template<> +inline bool isInt<8>(int64_t x) { + return static_cast(x) == x; } -inline bool isInt16 (int64_t Value) { - return static_cast(Value) == Value; +template<> +inline bool isInt<16>(int64_t x) { + return static_cast(x) == x; } -inline bool isUInt16(int64_t Value) { - return static_cast(Value) == Value; +template<> +inline bool isInt<32>(int64_t x) { + return static_cast(x) == x; } -inline bool isInt32 (int64_t Value) { - return static_cast(Value) == Value; + +/// isShiftedInt - Checks if a signed integer is an N bit number shifted +/// left by S. +template +inline bool isShiftedInt(int64_t x) { + return isInt(x) && (x % (1< +inline bool isUInt(uint64_t x) { + return N >= 64 || x < (UINT64_C(1)< +inline bool isUInt<8>(uint64_t x) { + return static_cast(x) == x; +} +template<> +inline bool isUInt<16>(uint64_t x) { + return static_cast(x) == x; +} +template<> +inline bool isUInt<32>(uint64_t x) { + return static_cast(x) == x; } -inline bool isUInt32(int64_t Value) { - return static_cast(Value) == Value; + +/// isShiftedUInt - Checks if a unsigned integer is an N bit number shifted +/// left by S. +template +inline bool isShiftedUInt(uint64_t x) { + return isUInt(x) && (x % (1<> (64 - N))); +} + +/// isIntN - Checks if an signed integer fits into the given (dynamic) +/// bit width. +inline bool isIntN(unsigned N, int64_t x) { + return N >= 64 || (-(INT64_C(1)<<(N-1)) <= x && x < (INT64_C(1)<<(N-1))); } /// isMask_32 - This function returns true if the argument is a sequence of ones @@ -66,20 +110,20 @@ inline bool isMask_64(uint64_t Value) { return Value && ((Value + 1) & Value) == 0; } -/// isShiftedMask_32 - This function returns true if the argument contains a +/// isShiftedMask_32 - This function returns true if the argument contains a /// sequence of ones with the remainder zero (32 bit version.) /// Ex. isShiftedMask_32(0x0000FF00U) == true. inline bool isShiftedMask_32(uint32_t Value) { return isMask_32((Value - 1) | Value); } -/// isShiftedMask_64 - This function returns true if the argument contains a +/// isShiftedMask_64 - This function returns true if the argument contains a /// sequence of ones with the remainder zero (64 bit version.) inline bool isShiftedMask_64(uint64_t Value) { return isMask_64((Value - 1) | Value); } -/// isPowerOf2_32 - This function returns true if the argument is a power of +/// isPowerOf2_32 - This function returns true if the argument is a power of /// two > 0. Ex. isPowerOf2_32(0x00100000U) == true (32 bit edition.) inline bool isPowerOf2_32(uint32_t Value) { return Value && !(Value & (Value - 1)); @@ -94,45 +138,19 @@ inline bool isPowerOf2_64(uint64_t Value) { /// 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_16(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_32(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_64(Value); } /// CountLeadingZeros_32 - this function performs the platform optimal form of @@ -150,7 +168,7 @@ inline unsigned CountLeadingZeros_32(uint32_t Value) { #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) { @@ -163,8 +181,16 @@ inline unsigned CountLeadingZeros_32(uint32_t Value) { return Count; } +/// CountLeadingOnes_32 - this function performs the operation of +/// counting the number of ones from the most significant bit to the first zero +/// bit. Ex. CountLeadingOnes_32(0xFF0FFF00) == 8. +/// Returns 32 if the word is all ones. +inline unsigned CountLeadingOnes_32(uint32_t Value) { + return CountLeadingZeros_32(~Value); +} + /// CountLeadingZeros_64 - This function performs the platform optimal form -/// of counting the number of zeros from the most significant bit to the first +/// of counting the number of zeros from the most significant bit to the first /// one bit (64 bit edition.) /// Returns 64 if the word is zero. inline unsigned CountLeadingZeros_64(uint64_t Value) { @@ -179,7 +205,7 @@ inline unsigned CountLeadingZeros_64(uint64_t Value) { 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) { @@ -207,6 +233,14 @@ inline unsigned CountLeadingZeros_64(uint64_t Value) { return Count; } +/// CountLeadingOnes_64 - This function performs the operation +/// of counting the number of ones from the most significant bit to the first +/// zero bit (64 bit edition.) +/// Returns 64 if the word is all ones. +inline unsigned CountLeadingOnes_64(uint64_t Value) { + return CountLeadingZeros_64(~Value); +} + /// CountTrailingZeros_32 - this function performs the platform optimal form of /// counting the number of zeros from the least significant bit to the first one /// bit. Ex. CountTrailingZeros_32(0xFF00FF00) == 8. @@ -224,8 +258,16 @@ inline unsigned CountTrailingZeros_32(uint32_t Value) { #endif } +/// CountTrailingOnes_32 - this function performs the operation of +/// counting the number of ones from the least significant bit to the first zero +/// bit. Ex. CountTrailingOnes_32(0x00FF00FF) == 8. +/// Returns 32 if the word is all ones. +inline unsigned CountTrailingOnes_32(uint32_t Value) { + return CountTrailingZeros_32(~Value); +} + /// CountTrailingZeros_64 - This function performs the platform optimal form -/// of counting the number of zeros from the least significant bit to the first +/// of counting the number of zeros from the least significant bit to the first /// one bit (64 bit edition.) /// Returns 64 if the word is zero. inline unsigned CountTrailingZeros_64(uint64_t Value) { @@ -243,6 +285,14 @@ inline unsigned CountTrailingZeros_64(uint64_t Value) { #endif } +/// CountTrailingOnes_64 - This function performs the operation +/// of counting the number of ones from the least significant bit to the first +/// zero bit (64 bit edition.) +/// Returns 64 if the word is all ones. +inline unsigned CountTrailingOnes_64(uint64_t Value) { + return CountTrailingZeros_64(~Value); +} + /// CountPopulation_32 - this function counts the number of set bits in a value. /// Ex. CountPopulation(0xF000F000) = 8 /// Returns 0 if the word is zero. @@ -269,14 +319,14 @@ inline unsigned CountPopulation_64(uint64_t Value) { #endif } -/// Log2_32 - This function returns the floor log base 2 of the specified value, +/// Log2_32 - This function returns the floor log base 2 of the specified value, /// -1 if the value is zero. (32 bit edition.) /// Ex. Log2_32(32) == 5, Log2_32(1) == 0, Log2_32(0) == -1, Log2_32(6) == 2 inline unsigned Log2_32(uint32_t Value) { return 31 - CountLeadingZeros_32(Value); } -/// Log2_64 - This function returns the floor log base 2 of the specified value, +/// Log2_64 - This function returns the floor log base 2 of the specified value, /// -1 if the value is zero. (64 bit edition.) inline unsigned Log2_64(uint64_t Value) { return 63 - CountLeadingZeros_64(Value); @@ -289,8 +339,8 @@ inline unsigned Log2_32_Ceil(uint32_t Value) { return 32-CountLeadingZeros_32(Value-1); } -/// Log2_64 - This function returns the ceil log base 2 of the specified value, -/// 64 if the value is zero. (64 bit edition.) +/// Log2_64_Ceil - This function returns the ceil log base 2 of the specified +/// value, 64 if the value is zero. (64 bit edition.) inline unsigned Log2_64_Ceil(uint64_t Value) { return 64-CountLeadingZeros_64(Value-1); } @@ -305,7 +355,7 @@ inline uint64_t GreatestCommonDivisor64(uint64_t A, uint64_t B) { } return A; } - + /// BitsToDouble - This function takes a 64-bit integer and returns the bit /// equivalent double. inline double BitsToDouble(uint64_t Bits) { @@ -329,7 +379,9 @@ inline float BitsToFloat(uint32_t Bits) { } /// DoubleToBits - This function takes a double and returns the bit -/// equivalent 64-bit integer. +/// equivalent 64-bit integer. Note that copying doubles around +/// changes the bits of NaNs on some hosts, notably x86, so this +/// routine cannot be used if these bits are needed. inline uint64_t DoubleToBits(double Double) { union { uint64_t L; @@ -340,7 +392,9 @@ inline uint64_t DoubleToBits(double Double) { } /// FloatToBits - This function takes a float and returns the bit -/// equivalent 32-bit integer. +/// equivalent 32-bit integer. Note that copying floats around +/// changes the bits of NaNs on some hosts, notably x86, so this +/// routine cannot be used if these bits are needed. inline uint32_t FloatToBits(float Float) { union { uint32_t I; @@ -360,11 +414,74 @@ int IsInf(double d); /// MinAlign - A and B are either alignments or offsets. Return the minimum /// alignment that may be assumed after adding the two together. -static inline unsigned MinAlign(unsigned A, unsigned B) { +inline uint64_t MinAlign(uint64_t A, uint64_t B) { // The largest power of 2 that divides both A and B. return (A | B) & -(A | B); } +/// NextPowerOf2 - Returns the next power of two (in 64-bits) +/// that is strictly greater than A. Returns zero on overflow. +inline uint64_t NextPowerOf2(uint64_t A) { + A |= (A >> 1); + A |= (A >> 2); + A |= (A >> 4); + A |= (A >> 8); + A |= (A >> 16); + A |= (A >> 32); + return A + 1; +} + +/// Returns the next integer (mod 2**64) that is greater than or equal to +/// \p Value and is a multiple of \p Align. \p Align must be non-zero. +/// +/// Examples: +/// \code +/// RoundUpToAlignment(5, 8) = 8 +/// RoundUpToAlignment(17, 8) = 24 +/// RoundUpToAlignment(~0LL, 8) = 0 +/// \endcode +inline uint64_t RoundUpToAlignment(uint64_t Value, uint64_t Align) { + return ((Value + Align - 1) / Align) * Align; +} + +/// Returns the offset to the next integer (mod 2**64) that is greater than +/// or equal to \p Value and is a multiple of \p Align. \p 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". +inline int64_t abs64(int64_t x) { + return (x < 0) ? -x : x; +} + +/// SignExtend32 - Sign extend B-bit number x to 32-bit int. +/// Usage int32_t r = SignExtend32<5>(x); +template inline int32_t SignExtend32(uint32_t x) { + return int32_t(x << (32 - B)) >> (32 - B); +} + +/// \brief Sign extend number in the bottom B bits of X to a 32-bit int. +/// Requires 0 < B <= 32. +inline int32_t SignExtend32(uint32_t X, unsigned B) { + 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 inline int64_t SignExtend64(uint64_t x) { + return int64_t(x << (64 - B)) >> (64 - B); +} + +/// \brief Sign extend number in the bottom B bits of X to a 64-bit int. +/// Requires 0 < B <= 64. +inline int64_t SignExtend64(uint64_t X, unsigned B) { + return int64_t(X << (64 - B)) >> (64 - B); +} + } // End llvm namespace #endif