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/*
* 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.
*/
#include "cpu/timing_expr.hh"
#include "base/intmath.hh"
TimingExprEvalContext::TimingExprEvalContext(const 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).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);
}