mozjs_sys 0.67.1

System crate for the Mozilla SpiderMonkey JavaScript engine.
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: set ts=8 sts=2 et sw=2 tw=80:
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "jit/x86-shared/Architecture-x86-shared.h"
#if !defined(JS_CODEGEN_X86) && !defined(JS_CODEGEN_X64)
#  error "Wrong architecture. Only x86 and x64 should build this file!"
#endif

#include "jit/RegisterSets.h"

const char* js::jit::FloatRegister::name() const {
  static const char* const names[] = {

#ifdef JS_CODEGEN_X64
#  define FLOAT_REGS_(TYPE)                                                   \
    "%xmm0" TYPE, "%xmm1" TYPE, "%xmm2" TYPE, "%xmm3" TYPE, "%xmm4" TYPE,     \
        "%xmm5" TYPE, "%xmm6" TYPE, "%xmm7" TYPE, "%xmm8" TYPE, "%xmm9" TYPE, \
        "%xmm10" TYPE, "%xmm11" TYPE, "%xmm12" TYPE, "%xmm13" TYPE,           \
        "%xmm14" TYPE, "%xmm15" TYPE
#else
#  define FLOAT_REGS_(TYPE)                                               \
    "%xmm0" TYPE, "%xmm1" TYPE, "%xmm2" TYPE, "%xmm3" TYPE, "%xmm4" TYPE, \
        "%xmm5" TYPE, "%xmm6" TYPE, "%xmm7" TYPE
#endif

      // These should be enumerated in the same order as in
      // FloatRegisters::ContentType.
      FLOAT_REGS_(".s"), FLOAT_REGS_(".d"), FLOAT_REGS_(".i4"),
      FLOAT_REGS_(".s4")
#undef FLOAT_REGS_

  };
  MOZ_ASSERT(size_t(code()) < mozilla::ArrayLength(names));
  return names[size_t(code())];
}

js::jit::FloatRegisterSet js::jit::FloatRegister::ReduceSetForPush(
    const FloatRegisterSet& s) {
  SetType bits = s.bits();

  // Ignore all SIMD register, if not supported.
  if (!JitSupportsSimd()) {
    bits &= Codes::AllPhysMask * Codes::SpreadScalar;
  }

  // Exclude registers which are already pushed with a larger type. High bits
  // are associated with larger register types. Thus we keep the set of
  // registers which are not included in larger type.
  bits &= ~(bits >> (1 * Codes::TotalPhys));
  bits &= ~(bits >> (2 * Codes::TotalPhys));
  bits &= ~(bits >> (3 * Codes::TotalPhys));

  return FloatRegisterSet(bits);
}

uint32_t js::jit::FloatRegister::GetPushSizeInBytes(const FloatRegisterSet& s) {
  SetType all = s.bits();
  SetType set128b = (all >> (uint32_t(Codes::Simd128) * Codes::TotalPhys)) &
                    Codes::AllPhysMask;
  SetType doubleSet = (all >> (uint32_t(Codes::Double) * Codes::TotalPhys)) &
                      Codes::AllPhysMask;
  SetType singleSet = (all >> (uint32_t(Codes::Single) * Codes::TotalPhys)) &
                      Codes::AllPhysMask;

  // PushRegsInMask pushes the largest register first, and thus avoids pushing
  // aliased registers. So we have to filter out the physical registers which
  // are already pushed as part of larger registers.
  SetType set64b = doubleSet & ~set128b;
  SetType set32b = singleSet & ~set64b & ~set128b;

  static_assert(Codes::AllPhysMask <= 0xffff,
                "We can safely use CountPopulation32");
  uint32_t count32b = mozilla::CountPopulation32(set32b);

#if defined(JS_CODEGEN_X64)
  // If we have an odd number of 32 bits values, then we increase the size to
  // keep the stack aligned on 8 bytes. Note: Keep in sync with
  // PushRegsInMask, and PopRegsInMaskIgnore.
  count32b += count32b & 1;
#endif

  return mozilla::CountPopulation32(set128b) * (4 * sizeof(int32_t)) +
         mozilla::CountPopulation32(set64b) * sizeof(double) +
         count32b * sizeof(float);
}
uint32_t js::jit::FloatRegister::getRegisterDumpOffsetInBytes() {
  return uint32_t(encoding()) * sizeof(FloatRegisters::RegisterContent);
}