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/*
* Copyright (C) 2015-2021 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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.
*/
#pragma once
#if ENABLE(B3_JIT)
#include "AirArgInlines.h"
#include "AirBlockWorklist.h"
#include "AirCode.h"
#include "AirInstInlines.h"
#include "AirTmpInlines.h"
#include <wtf/CommaPrinter.h>
#include <wtf/Vector.h>
namespace JSC { namespace B3 { namespace Air {
class Code;
// Computes the number of uses of a tmp based on frequency of execution. The frequency of blocks
// that are only reachable by rare edges is scaled by Options::rareBlockPenalty().
class UseCounts {
public:
UseCounts(Code& code)
{
// Find non-rare blocks.
BlockWorklist fastWorklist;
fastWorklist.push(code[0]);
while (BasicBlock* block = fastWorklist.pop()) {
for (FrequentedBlock& successor : block->successors()) {
if (!successor.isRare())
fastWorklist.push(successor.block());
}
}
unsigned gpArraySize = AbsoluteTmpMapper<GP>::absoluteIndex(code.numTmps(GP));
m_gpNumWarmUsesAndDefs = FixedVector<float>(gpArraySize, 0);
m_gpConstDefs.ensureSize(gpArraySize);
unsigned fpArraySize = AbsoluteTmpMapper<FP>::absoluteIndex(code.numTmps(FP));
m_fpNumWarmUsesAndDefs = FixedVector<float>(fpArraySize, 0);
m_fpConstDefs.ensureSize(fpArraySize);
for (BasicBlock* block : code) {
double frequency = block->frequency();
if (!fastWorklist.saw(block))
frequency *= Options::rareBlockPenalty();
for (Inst& inst : *block) {
inst.forEach<Tmp>(
[&] (Tmp& tmp, Arg::Role role, Bank bank, Width) {
if (Arg::isWarmUse(role) || Arg::isAnyDef(role)) {
if (bank == GP)
m_gpNumWarmUsesAndDefs[AbsoluteTmpMapper<GP>::absoluteIndex(tmp)] += frequency;
else
m_fpNumWarmUsesAndDefs[AbsoluteTmpMapper<FP>::absoluteIndex(tmp)] += frequency;
}
});
if ((inst.kind.opcode == Move || inst.kind.opcode == Move32)
&& inst.args[0].isSomeImm()
&& inst.args[1].is<Tmp>()) {
Tmp tmp = inst.args[1].as<Tmp>();
if (tmp.bank() == GP)
m_gpConstDefs.quickSet(AbsoluteTmpMapper<GP>::absoluteIndex(tmp));
else
m_fpConstDefs.quickSet(AbsoluteTmpMapper<FP>::absoluteIndex(tmp));
}
}
}
}
template<Bank bank>
bool isConstDef(unsigned absoluteIndex) const
{
if (bank == GP)
return m_gpConstDefs.quickGet(absoluteIndex);
return m_fpConstDefs.quickGet(absoluteIndex);
}
template<Bank bank>
float numWarmUsesAndDefs(unsigned absoluteIndex) const
{
if (bank == GP)
return m_gpNumWarmUsesAndDefs[absoluteIndex];
return m_fpNumWarmUsesAndDefs[absoluteIndex];
}
void dump(PrintStream& out) const
{
CommaPrinter comma(", ");
for (unsigned i = 0; i < m_gpNumWarmUsesAndDefs.size(); ++i)
out.print(comma, AbsoluteTmpMapper<GP>::tmpFromAbsoluteIndex(i), "=> {numWarmUsesAndDefs=", m_gpNumWarmUsesAndDefs[i], ", isConstDef=", m_gpConstDefs.quickGet(i), "}");
for (unsigned i = 0; i < m_fpNumWarmUsesAndDefs.size(); ++i)
out.print(comma, AbsoluteTmpMapper<FP>::tmpFromAbsoluteIndex(i), "=> {numWarmUsesAndDefs=", m_fpNumWarmUsesAndDefs[i], ", isConstDef=", m_fpConstDefs.quickGet(i), "}");
}
private:
FixedVector<float> m_gpNumWarmUsesAndDefs;
FixedVector<float> m_fpNumWarmUsesAndDefs;
BitVector m_gpConstDefs;
BitVector m_fpConstDefs;
};
} } } // namespace JSC::B3::Air
#endif // ENABLE(B3_JIT)
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