WebKit/Source/JavaScriptCore/b3/air/AirPadInterference.cpp at main · WebKit/WebKit · GitHub

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* 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

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#include "config.h"

#include "AirPadInterference.h"

#if ENABLE(B3_JIT)

#include "AirCode.h"

#include "AirInsertionSet.h"

#include "AirInstInlines.h"

#include "Options.h"

namespace JSC { namespace B3 { namespace Air {

void padInterference(Code& code)

{

InsertionSet insertionSet(code);

for (BasicBlock* block : code) {

if (block->size() < 2)

continue;

bool prevHasLateUseOrDef = block->at(0).paddingSummary().hasLateUseOrDef;

for (unsigned instIndex = 1; instIndex < block->size(); ++instIndex) {

Inst& inst = block->at(instIndex);

Inst::PaddingSummary summary = inst.paddingSummary();

if (prevHasLateUseOrDef && summary.hasEarlyDef)

insertionSet.insert(instIndex, Padding, inst.origin);

prevHasLateUseOrDef = summary.hasLateUseOrDef;

}

insertionSet.execute(block);

}

} } } // namespace JSC::B3::Air

#endif // ENABLE(B3_JIT)

WebKit/Source/JavaScriptCore/b3/air/AirPadInterference.cpp at main · WebKit/WebKit · GitHub

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