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// Copyright 2013, ARM Limited
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of ARM Limited nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef VIXL_UTILS_H
#define VIXL_UTILS_H
#include <math.h>
#include <string.h>
#include "globals.h"
namespace vixl {
// Macros for compile-time format checking.
#if defined(__GNUC__)
#define PRINTF_CHECK(format_index, varargs_index) \
__attribute__((format(printf, format_index, varargs_index)))
#else
#define PRINTF_CHECK(format_index, varargs_index)
#endif
// Check number width.
inline bool is_intn(unsigned n, int64_t x) {
VIXL_ASSERT((0 < n) && (n < 64));
int64_t limit = INT64_C(1) << (n - 1);
return (-limit <= x) && (x < limit);
}
inline bool is_uintn(unsigned n, int64_t x) {
VIXL_ASSERT((0 < n) && (n < 64));
return !(x >> n);
}
inline unsigned truncate_to_intn(unsigned n, int64_t x) {
VIXL_ASSERT((0 < n) && (n < 64));
return (x & ((INT64_C(1) << n) - 1));
}
#define INT_1_TO_63_LIST(V) \
V(1) V(2) V(3) V(4) V(5) V(6) V(7) V(8) \
V(9) V(10) V(11) V(12) V(13) V(14) V(15) V(16) \
V(17) V(18) V(19) V(20) V(21) V(22) V(23) V(24) \
V(25) V(26) V(27) V(28) V(29) V(30) V(31) V(32) \
V(33) V(34) V(35) V(36) V(37) V(38) V(39) V(40) \
V(41) V(42) V(43) V(44) V(45) V(46) V(47) V(48) \
V(49) V(50) V(51) V(52) V(53) V(54) V(55) V(56) \
V(57) V(58) V(59) V(60) V(61) V(62) V(63)
#define DECLARE_IS_INT_N(N) \
inline bool is_int##N(int64_t x) { return is_intn(N, x); }
#define DECLARE_IS_UINT_N(N) \
inline bool is_uint##N(int64_t x) { return is_uintn(N, x); }
#define DECLARE_TRUNCATE_TO_INT_N(N) \
inline int truncate_to_int##N(int x) { return truncate_to_intn(N, x); }
INT_1_TO_63_LIST(DECLARE_IS_INT_N)
INT_1_TO_63_LIST(DECLARE_IS_UINT_N)
INT_1_TO_63_LIST(DECLARE_TRUNCATE_TO_INT_N)
#undef DECLARE_IS_INT_N
#undef DECLARE_IS_UINT_N
#undef DECLARE_TRUNCATE_TO_INT_N
// Bit field extraction.
inline uint32_t unsigned_bitextract_32(int msb, int lsb, uint32_t x) {
return (x >> lsb) & ((1 << (1 + msb - lsb)) - 1);
}
inline uint64_t unsigned_bitextract_64(int msb, int lsb, uint64_t x) {
return (x >> lsb) & ((static_cast<uint64_t>(1) << (1 + msb - lsb)) - 1);
}
inline int32_t signed_bitextract_32(int msb, int lsb, int32_t x) {
return (x << (31 - msb)) >> (lsb + 31 - msb);
}
inline int64_t signed_bitextract_64(int msb, int lsb, int64_t x) {
return (x << (63 - msb)) >> (lsb + 63 - msb);
}
// Floating point representation.
uint32_t float_to_rawbits(float value);
uint64_t double_to_rawbits(double value);
float rawbits_to_float(uint32_t bits);
double rawbits_to_double(uint64_t bits);
// NaN tests.
inline bool IsSignallingNaN(double num) {
const uint64_t kFP64QuietNaNMask = UINT64_C(0x0008000000000000);
uint64_t raw = double_to_rawbits(num);
if (isnan(num) && ((raw & kFP64QuietNaNMask) == 0)) {
return true;
}
return false;
}
inline bool IsSignallingNaN(float num) {
const uint32_t kFP32QuietNaNMask = 0x00400000;
uint32_t raw = float_to_rawbits(num);
if (isnan(num) && ((raw & kFP32QuietNaNMask) == 0)) {
return true;
}
return false;
}
template <typename T>
inline bool IsQuietNaN(T num) {
return isnan(num) && !IsSignallingNaN(num);
}
// Convert the NaN in 'num' to a quiet NaN.
inline double ToQuietNaN(double num) {
const uint64_t kFP64QuietNaNMask = UINT64_C(0x0008000000000000);
VIXL_ASSERT(isnan(num));
return rawbits_to_double(double_to_rawbits(num) | kFP64QuietNaNMask);
}
inline float ToQuietNaN(float num) {
const uint32_t kFP32QuietNaNMask = 0x00400000;
VIXL_ASSERT(isnan(num));
return rawbits_to_float(float_to_rawbits(num) | kFP32QuietNaNMask);
}
// Fused multiply-add.
inline double FusedMultiplyAdd(double op1, double op2, double a) {
return fma(op1, op2, a);
}
inline float FusedMultiplyAdd(float op1, float op2, float a) {
return fmaf(op1, op2, a);
}
// Bit counting.
int CountLeadingZeros(uint64_t value, int width);
int CountLeadingSignBits(int64_t value, int width);
int CountTrailingZeros(uint64_t value, int width);
int CountSetBits(uint64_t value, int width);
uint64_t LowestSetBit(uint64_t value);
bool IsPowerOf2(int64_t value);
// Pointer alignment
// TODO: rename/refactor to make it specific to instructions.
template<typename T>
bool IsWordAligned(T pointer) {
VIXL_ASSERT(sizeof(pointer) == sizeof(intptr_t)); // NOLINT(runtime/sizeof)
return ((intptr_t)(pointer) & 3) == 0;
}
// Increment a pointer until it has the specified alignment.
template<class T>
T AlignUp(T pointer, size_t alignment) {
// Use C-style casts to get static_cast behaviour for integral types (T), and
// reinterpret_cast behaviour for other types.
uintptr_t pointer_raw = (uintptr_t)pointer;
VIXL_STATIC_ASSERT(sizeof(pointer) == sizeof(pointer_raw));
size_t align_step = (alignment - pointer_raw) % alignment;
VIXL_ASSERT((pointer_raw + align_step) % alignment == 0);
return (T)(pointer_raw + align_step);
}
// Decrement a pointer until it has the specified alignment.
template<class T>
T AlignDown(T pointer, size_t alignment) {
// Use C-style casts to get static_cast behaviour for integral types (T), and
// reinterpret_cast behaviour for other types.
uintptr_t pointer_raw = (uintptr_t)pointer;
VIXL_STATIC_ASSERT(sizeof(pointer) == sizeof(pointer_raw));
size_t align_step = pointer_raw % alignment;
VIXL_ASSERT((pointer_raw - align_step) % alignment == 0);
return (T)(pointer_raw - align_step);
}
} // namespace vixl
#endif // VIXL_UTILS_H
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