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Diffstat (limited to 'qemu/disas/libvixl/utils.cc')
| -rw-r--r-- | qemu/disas/libvixl/utils.cc | 151 |
1 files changed, 0 insertions, 151 deletions
diff --git a/qemu/disas/libvixl/utils.cc b/qemu/disas/libvixl/utils.cc deleted file mode 100644 index 80b132a11..000000000 --- a/qemu/disas/libvixl/utils.cc +++ /dev/null @@ -1,151 +0,0 @@ -// 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. - -#include "utils.h" -#include <stdio.h> - -namespace vixl { - -uint32_t float_to_rawbits(float value) { - uint32_t bits = 0; - memcpy(&bits, &value, 4); - return bits; -} - - -uint64_t double_to_rawbits(double value) { - uint64_t bits = 0; - memcpy(&bits, &value, 8); - return bits; -} - - -float rawbits_to_float(uint32_t bits) { - float value = 0.0; - memcpy(&value, &bits, 4); - return value; -} - - -double rawbits_to_double(uint64_t bits) { - double value = 0.0; - memcpy(&value, &bits, 8); - return value; -} - - -int CountLeadingZeros(uint64_t value, int width) { - VIXL_ASSERT((width == 32) || (width == 64)); - int count = 0; - uint64_t bit_test = UINT64_C(1) << (width - 1); - while ((count < width) && ((bit_test & value) == 0)) { - count++; - bit_test >>= 1; - } - return count; -} - - -int CountLeadingSignBits(int64_t value, int width) { - VIXL_ASSERT((width == 32) || (width == 64)); - if (value >= 0) { - return CountLeadingZeros(value, width) - 1; - } else { - return CountLeadingZeros(~value, width) - 1; - } -} - - -int CountTrailingZeros(uint64_t value, int width) { - VIXL_ASSERT((width == 32) || (width == 64)); - int count = 0; - while ((count < width) && (((value >> count) & 1) == 0)) { - count++; - } - return count; -} - - -int CountSetBits(uint64_t value, int width) { - // TODO: Other widths could be added here, as the implementation already - // supports them. - VIXL_ASSERT((width == 32) || (width == 64)); - - // Mask out unused bits to ensure that they are not counted. - value &= (UINT64_C(0xffffffffffffffff) >> (64-width)); - - // Add up the set bits. - // The algorithm works by adding pairs of bit fields together iteratively, - // where the size of each bit field doubles each time. - // An example for an 8-bit value: - // Bits: h g f e d c b a - // \ | \ | \ | \ | - // value = h+g f+e d+c b+a - // \ | \ | - // value = h+g+f+e d+c+b+a - // \ | - // value = h+g+f+e+d+c+b+a - const uint64_t kMasks[] = { - UINT64_C(0x5555555555555555), - UINT64_C(0x3333333333333333), - UINT64_C(0x0f0f0f0f0f0f0f0f), - UINT64_C(0x00ff00ff00ff00ff), - UINT64_C(0x0000ffff0000ffff), - UINT64_C(0x00000000ffffffff), - }; - - for (unsigned i = 0; i < (sizeof(kMasks) / sizeof(kMasks[0])); i++) { - int shift = 1 << i; - value = ((value >> shift) & kMasks[i]) + (value & kMasks[i]); - } - - return value; -} - - -uint64_t LowestSetBit(uint64_t value) { - return value & -value; -} - - -bool IsPowerOf2(int64_t value) { - return (value != 0) && ((value & (value - 1)) == 0); -} - - -unsigned CountClearHalfWords(uint64_t imm, unsigned reg_size) { - VIXL_ASSERT((reg_size % 8) == 0); - int count = 0; - for (unsigned i = 0; i < (reg_size / 16); i++) { - if ((imm & 0xffff) == 0) { - count++; - } - imm >>= 16; - } - return count; -} - -} // namespace vixl |