ftl/FTLInlineCacheSize.cpp

   1 /*
   2  * Copyright (C) 2013-2015 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 "DFGNode.h"
  32 #include "JITInlineCacheGenerator.h"
  33 #include "MacroAssembler.h"
  34
  35 namespace JSC { namespace FTL {
  36
  37 using namespace DFG;
  38
  39 // The default sizes are x86-64-specific, and were found empirically. They have to cover the worst
  40 // possible combination of registers leading to the largest possible encoding of each instruction in
  41 // the IC.
  42 //
  43 // FIXME: The ARM64 sizes are overestimates; if there is any branch compaction then we should be able
  44 // to get away with less. The branch compaction code currently validates the size of the IC before
  45 // doing any compaction, so we need to overestimate and give the uncompacted size. This would be
  46 // relatively easy to fix.
  47 // https://bugs.webkit.org/show_bug.cgi?id=129335
  48
  49 size_t sizeOfGetById()
  50 {
  51 #if CPU(ARM64)
  52     return 36;
  53 #else
  54     return 30;
  55 #endif
  56 }
  57
  58 size_t sizeOfPutById()
  59 {
  60 #if CPU(ARM64)
  61     return 44;
  62 #else
  63     return 32;
  64 #endif
  65 }
  66
  67 size_t sizeOfCall()
  68 {
  69 #if CPU(ARM64)
  70     return 56;
  71 #else
  72     return 53;
  73 #endif
  74 }
  75
  76 size_t sizeOfCallVarargs()
  77 {
  78 #if CPU(ARM64)
  79     return 332;
  80 #else
  81     return 275;
  82 #endif
  83 }
  84
  85 size_t sizeOfCallForwardVarargs()
  86 {
  87 #if CPU(ARM64)
  88     return 312;
  89 #else
  90     return 262;
  91 #endif
  92 }
  93
  94 size_t sizeOfConstructVarargs()
  95 {
  96     return sizeOfCallVarargs(); // Should be the same size.
  97 }
  98
  99 size_t sizeOfConstructForwardVarargs()
 100 {
 101     return sizeOfCallForwardVarargs(); // Should be the same size.
 102 }
 103
 104 size_t sizeOfIn()
 105 {
 106 #if CPU(ARM64)
 107     return 4;
 108 #else
 109     return 5;
 110 #endif
 111 }
 112
 113 size_t sizeOfICFor(Node* node)
 114 {
 115     switch (node->op()) {
 116     case GetById:
 117         return sizeOfGetById();
 118     case PutById:
 119         return sizeOfPutById();
 120     case Call:
 121     case Construct:
 122         return sizeOfCall();
 123     case CallVarargs:
 124         return sizeOfCallVarargs();
 125     case CallForwardVarargs:
 126         return sizeOfCallForwardVarargs();
 127     case ConstructVarargs:
 128         return sizeOfConstructVarargs();
 129     case ConstructForwardVarargs:
 130         return sizeOfConstructForwardVarargs();
 131     case In:
 132         return sizeOfIn();
 133     default:
 134         return 0;
 135     }
 136 }
 137
 138 } } // namespace JSC::FTL
 139
 140 #endif // ENABLE(FTL_JIT)
 141