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Diffstat (limited to 'src/cpu/timing_expr.cc')
-rw-r--r-- | src/cpu/timing_expr.cc | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/src/cpu/timing_expr.cc b/src/cpu/timing_expr.cc new file mode 100644 index 000000000..d6d904956 --- /dev/null +++ b/src/cpu/timing_expr.cc @@ -0,0 +1,248 @@ +/* + * Copyright (c) 2013-2014 ARM Limited + * All rights reserved. + * + * The license below extends only to copyright in the software and shall + * not be construed as granting a license to any other intellectual + * property including but not limited to intellectual property relating + * to a hardware implementation of the functionality of the software + * licensed hereunder. You may use the software subject to the license + * terms below provided that you ensure that this notice is replicated + * unmodified and in its entirety in all distributions of the software, + * modified or unmodified, in source code or in binary form. + * + * 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 the copyright holders 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 AND 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. + * + * Authors: Andrew Bardsley + */ + +#include "base/intmath.hh" +#include "cpu/timing_expr.hh" + +TimingExprEvalContext::TimingExprEvalContext (StaticInstPtr inst_, + ThreadContext *thread_, + TimingExprLet *let_) : + inst(inst_), thread(thread_), let(let_) +{ + /* Reserve space to hold the results of evaluating the + * let expressions */ + if (let) { + unsigned int num_defns = let->defns.size(); + + results.resize(num_defns, 0); + resultAvailable.resize(num_defns, false); + } +} + +uint64_t TimingExprSrcReg::eval(TimingExprEvalContext &context) +{ + return context.inst->srcRegIdx(index); +} + +uint64_t TimingExprReadIntReg::eval(TimingExprEvalContext &context) +{ + return context.thread->readIntReg(reg->eval(context)); +} + +uint64_t TimingExprLet::eval(TimingExprEvalContext &context) +{ + TimingExprEvalContext new_context(context.inst, + context.thread, this); + + return expr->eval(new_context); +} + +uint64_t TimingExprRef::eval(TimingExprEvalContext &context) +{ + /* Lookup the result, evaluating if necessary. @todo, this + * should have more error checking */ + if (!context.resultAvailable[index]) { + context.results[index] = context.let->defns[index]->eval(context); + context.resultAvailable[index] = true; + } + + return context.results[index]; +} + +uint64_t TimingExprUn::eval(TimingExprEvalContext &context) +{ + uint64_t arg_value = arg->eval(context); + uint64_t ret = 0; + + switch (op) { + case Enums::timingExprSizeInBits: + if (arg_value == 0) + ret = 0; + else + ret = ceilLog2(arg_value); + break; + case Enums::timingExprNot: + ret = arg_value != 0; + break; + case Enums::timingExprInvert: + ret = ~arg_value; + break; + case Enums::timingExprSignExtend32To64: + ret = static_cast<int64_t>( + static_cast<int32_t>(arg_value)); + break; + case Enums::timingExprAbs: + if (static_cast<int64_t>(arg_value) < 0) + ret = -arg_value; + else + ret = arg_value; + break; + default: + break; + } + + return ret; +} + +uint64_t TimingExprBin::eval(TimingExprEvalContext &context) +{ + uint64_t left_value = left->eval(context); + uint64_t right_value = right->eval(context); + uint64_t ret = 0; + + switch (op) { + case Enums::timingExprAdd: + ret = left_value + right_value; + break; + case Enums::timingExprSub: + ret = left_value - right_value; + break; + case Enums::timingExprUMul: + ret = left_value * right_value; + break; + case Enums::timingExprUDiv: + if (right_value != 0) { + ret = left_value / right_value; + } + break; + case Enums::timingExprUCeilDiv: + if (right_value != 0) { + ret = (left_value + (right_value - 1)) / right_value; + } + break; + case Enums::timingExprSMul: + ret = static_cast<int64_t>(left_value) * + static_cast<int64_t>(right_value); + break; + case Enums::timingExprSDiv: + if (right_value != 0) { + ret = static_cast<int64_t>(left_value) / + static_cast<int64_t>(right_value); + } + break; + case Enums::timingExprEqual: + ret = left_value == right_value; + break; + case Enums::timingExprNotEqual: + ret = left_value != right_value; + break; + case Enums::timingExprULessThan: + ret = left_value < right_value; + break; + case Enums::timingExprUGreaterThan: + ret = left_value > right_value; + break; + case Enums::timingExprSLessThan: + ret = static_cast<int64_t>(left_value) < + static_cast<int64_t>(right_value); + break; + case Enums::timingExprSGreaterThan: + ret = static_cast<int64_t>(left_value) > + static_cast<int64_t>(right_value); + break; + case Enums::timingExprAnd: + ret = (left_value != 0) && (right_value != 0); + break; + case Enums::timingExprOr: + ret = (left_value != 0) || (right_value != 0); + break; + default: + break; + } + + return ret; +} + +uint64_t TimingExprIf::eval(TimingExprEvalContext &context) +{ + uint64_t cond_value = cond->eval(context); + + if (cond_value != 0) + return trueExpr->eval(context); + else + return falseExpr->eval(context); +} + +TimingExprLiteral * +TimingExprLiteralParams::create() +{ + return new TimingExprLiteral(this); +} + +TimingExprSrcReg * +TimingExprSrcRegParams::create() +{ + return new TimingExprSrcReg(this); +} + +TimingExprReadIntReg * +TimingExprReadIntRegParams::create() +{ + return new TimingExprReadIntReg(this); +} + +TimingExprLet * +TimingExprLetParams::create() +{ + return new TimingExprLet(this); +} + +TimingExprRef * +TimingExprRefParams::create() +{ + return new TimingExprRef(this); +} + +TimingExprUn * +TimingExprUnParams::create() +{ + return new TimingExprUn(this); +} + +TimingExprBin * +TimingExprBinParams::create() +{ + return new TimingExprBin(this); +} + +TimingExprIf * +TimingExprIfParams::create() +{ + return new TimingExprIf(this); +} |