ftl/FTLInlineCacheSize.cpp

   1 /*
   2  * Copyright (C) 2013, 2014 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "FTLInlineCacheSize.h"
  28
  29 #if ENABLE(FTL_JIT)
  30
  31 #include "JITInlineCacheGenerator.h"
  32 #include "MacroAssembler.h"
  33
  34 namespace JSC { namespace FTL {
  35
  36 // The default sizes are x86-64-specific, and were found empirically. They have to cover the worst
  37 // possible combination of registers leading to the largest possible encoding of each instruction in
  38 // the IC.
  39 //
  40 // FIXME: The ARM64 sizes are overestimates; if there is any branch compaction then we should be able
  41 // to get away with less. The branch compaction code currently validates the size of the IC before
  42 // doing any compaction, so we need to overestimate and give the uncompacted size. This would be
  43 // relatively easy to fix.
  44 // https://bugs.webkit.org/show_bug.cgi?id=129335
  45
  46 size_t sizeOfGetById()
  47 {
  48 #if CPU(ARM64)
  49     return 36;
  50 #else
  51     return 30;
  52 #endif
  53 }
  54
  55 size_t sizeOfPutById()
  56 {
  57 #if CPU(ARM64)
  58     return 44;
  59 #else
  60     return 32;
  61 #endif
  62 }
  63
  64 size_t sizeOfCall()
  65 {
  66 #if CPU(ARM64)
  67     return 56;
  68 #else
  69     return 53;
  70 #endif
  71 }
  72
  73 } } // namespace JSC::FTL
  74
  75 #endif // ENABLE(FTL_JIT)
  76