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/*
* Copyright (C) 2016 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.
*/
#include "config.h"
#include "AirPadInterference.h"
#if ENABLE(B3_JIT)
#include "AirCode.h"
#include "AirInsertionSet.h"
#include "AirInstInlines.h"
namespace JSC { namespace B3 { namespace Air {
void padInterference(Code& code)
{
InsertionSet insertionSet(code);
for (BasicBlock* block : code) {
bool prevHadLate = false;
for (unsigned instIndex = 0; instIndex < block->size(); ++instIndex) {
Inst& inst = block->at(instIndex);
bool hasEarlyDef = false;
bool hasLate = false;
inst.forEachArg(
[&] (Arg&, Arg::Role role, Arg::Type, Arg::Width) {
switch (role) {
case Arg::EarlyDef:
hasEarlyDef = true;
break;
case Arg::LateUse:
case Arg::Def:
case Arg::ZDef:
case Arg::LateColdUse:
case Arg::UseDef:
case Arg::UseZDef:
hasLate = true;
break;
case Arg::Scratch:
hasEarlyDef = true;
hasLate = true;
break;
case Arg::Use:
case Arg::ColdUse:
case Arg::UseAddr:
break;
}
});
if (inst.kind.opcode == Patch) {
hasEarlyDef |= !inst.extraEarlyClobberedRegs().isEmpty();
hasLate |= !inst.extraClobberedRegs().isEmpty();
}
if (hasEarlyDef && prevHadLate)
insertionSet.insert(instIndex, Nop, inst.origin);
prevHadLate = hasLate;
}
insertionSet.execute(block);
}
}
} } } // namespace JSC::B3::Air
#endif // ENABLE(B3_JIT)
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