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authorDon Dugger <n0ano@n0ano.com>2016-06-03 03:33:22 +0000
committerGerrit Code Review <gerrit@172.30.200.206>2016-06-03 03:33:23 +0000
commitda27230f80795d0028333713f036d44c53cb0e68 (patch)
treeb3d379eaf000adf72b36cb01cdf4d79c3e3f064c /qemu/disas/libvixl/vixl/utils.cc
parent0e68cb048bb8aadb14675f5d4286d8ab2fc35449 (diff)
parent437fd90c0250dee670290f9b714253671a990160 (diff)
Merge "These changes are the raw update to qemu-2.6."
Diffstat (limited to 'qemu/disas/libvixl/vixl/utils.cc')
-rw-r--r--qemu/disas/libvixl/vixl/utils.cc142
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