diff options
author | 2016-05-18 13:18:31 +0300 | |
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committer | 2016-05-18 13:42:15 +0300 | |
commit | 437fd90c0250dee670290f9b714253671a990160 (patch) | |
tree | b871786c360704244a07411c69fb58da9ead4a06 /qemu/disas/libvixl/vixl/utils.cc | |
parent | 5bbd6fe9b8bab2a93e548c5a53b032d1939eec05 (diff) |
These changes are the raw update to qemu-2.6.
Collission happened in the following patches:
migration: do cleanup operation after completion(738df5b9)
Bug fix.(1750c932f86)
kvmclock: add a new function to update env->tsc.(b52baab2)
The code provided by the patches was already in the upstreamed
version.
Change-Id: I3cc11841a6a76ae20887b2e245710199e1ea7f9a
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
Diffstat (limited to 'qemu/disas/libvixl/vixl/utils.cc')
-rw-r--r-- | qemu/disas/libvixl/vixl/utils.cc | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/qemu/disas/libvixl/vixl/utils.cc b/qemu/disas/libvixl/vixl/utils.cc new file mode 100644 index 000000000..3b8bd75fb --- /dev/null +++ b/qemu/disas/libvixl/vixl/utils.cc @@ -0,0 +1,142 @@ +// Copyright 2015, 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 "vixl/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; +} + + +uint32_t float_sign(float val) { + uint32_t rawbits = float_to_rawbits(val); + return unsigned_bitextract_32(31, 31, rawbits); +} + + +uint32_t float_exp(float val) { + uint32_t rawbits = float_to_rawbits(val); + return unsigned_bitextract_32(30, 23, rawbits); +} + + +uint32_t float_mantissa(float val) { + uint32_t rawbits = float_to_rawbits(val); + return unsigned_bitextract_32(22, 0, rawbits); +} + + +uint32_t double_sign(double val) { + uint64_t rawbits = double_to_rawbits(val); + return static_cast<uint32_t>(unsigned_bitextract_64(63, 63, rawbits)); +} + + +uint32_t double_exp(double val) { + uint64_t rawbits = double_to_rawbits(val); + return static_cast<uint32_t>(unsigned_bitextract_64(62, 52, rawbits)); +} + + +uint64_t double_mantissa(double val) { + uint64_t rawbits = double_to_rawbits(val); + return unsigned_bitextract_64(51, 0, rawbits); +} + + +float float_pack(uint32_t sign, uint32_t exp, uint32_t mantissa) { + uint32_t bits = (sign << 31) | (exp << 23) | mantissa; + return rawbits_to_float(bits); +} + + +double double_pack(uint64_t sign, uint64_t exp, uint64_t mantissa) { + uint64_t bits = (sign << 63) | (exp << 52) | mantissa; + return rawbits_to_double(bits); +} + + +int float16classify(float16 value) { + uint16_t exponent_max = (1 << 5) - 1; + uint16_t exponent_mask = exponent_max << 10; + uint16_t mantissa_mask = (1 << 10) - 1; + + uint16_t exponent = (value & exponent_mask) >> 10; + uint16_t mantissa = value & mantissa_mask; + if (exponent == 0) { + if (mantissa == 0) { + return FP_ZERO; + } + return FP_SUBNORMAL; + } else if (exponent == exponent_max) { + if (mantissa == 0) { + return FP_INFINITE; + } + return FP_NAN; + } + return FP_NORMAL; +} + + +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 |