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/*
* Copyright (C) 2015-2016 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 "AirReportUsedRegisters.h"
#if ENABLE(B3_JIT)
#include "AirCode.h"
#include "AirInstInlines.h"
#include "AirLiveness.h"
#include "AirPhaseScope.h"
namespace JSC { namespace B3 { namespace Air {
void reportUsedRegisters(Code& code)
{
PhaseScope phaseScope(code, "reportUsedRegisters");
RegLiveness liveness(code);
for (BasicBlock* block : code) {
RegLiveness::LocalCalc localCalc(liveness, block);
for (unsigned instIndex = block->size(); instIndex--;) {
Inst& inst = block->at(instIndex);
// Kill dead assignments to registers. For simplicity we say that a store is killable if
// it has only late defs and those late defs are to registers that are dead right now.
if (!inst.hasNonArgEffects()) {
bool canDelete = true;
inst.forEachArg(
[&] (Arg& arg, Arg::Role role, Arg::Type, Arg::Width) {
if (Arg::isEarlyDef(role)) {
canDelete = false;
return;
}
if (!Arg::isLateDef(role))
return;
if (!arg.isReg()) {
canDelete = false;
return;
}
if (localCalc.isLive(arg.reg())) {
canDelete = false;
return;
}
});
if (canDelete)
inst = Inst();
}
if (inst.opcode == Patch) {
RegisterSet registerSet;
for (Reg reg : localCalc.live())
registerSet.set(reg);
inst.reportUsedRegisters(registerSet);
}
localCalc.execute(instIndex);
}
block->insts().removeAllMatching(
[&] (const Inst& inst) -> bool {
return !inst;
});
}
}
} } } // namespace JSC::B3::Air
#endif // ENABLE(B3_JIT)
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