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authorPeter Maydell <peter.maydell@linaro.org>2016-01-11 16:09:50 +0000
committerPeter Maydell <peter.maydell@linaro.org>2016-01-11 16:09:50 +0000
commit7b8a354d4716ab2c201fad04c22b8d4a16a1b8c6 (patch)
tree8b3d2f11cfbcf8c3ae5d8350829a341556f2679d /disas/libvixl/vixl/utils.cc
parentac0d9dbf33608d0b178e0bd414ec7397ada17834 (diff)
parentfea9b3ca9cc4685f89e0b929a61e51098fbb4f49 (diff)
downloadqemu-arm-7b8a354d4716ab2c201fad04c22b8d4a16a1b8c6.tar.gz
Merge remote-tracking branch 'remotes/pmaydell/tags/pull-target-arm-20160111-1' into staging
target-arm queue: * i.MX: move i.MX31 CCM object to register array * xilinx_axidma: remove dead code * disas/libvixl: Update to upstream VIXL 1.12 * virt: Support legacy -nic command line syntax # gpg: Signature made Mon 11 Jan 2016 16:05:58 GMT using RSA key ID 14360CDE # gpg: Good signature from "Peter Maydell <peter.maydell@linaro.org>" # gpg: aka "Peter Maydell <pmaydell@gmail.com>" # gpg: aka "Peter Maydell <pmaydell@chiark.greenend.org.uk>" * remotes/pmaydell/tags/pull-target-arm-20160111-1: hw/arm/virt: Support legacy -nic command line syntax disas/libvixl: Update to upstream VIXL 1.12 hw/dma/xilinx_axidma: remove dead code i.MX: move i.MX31 CCM object to register array Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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+// 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