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Datei: matcher_arm.hpp Sprache: C

/*
* Copyright (c) 2021, 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/

#ifndef CPU_ARM_MATCHER_ARM_HPP
#define CPU_ARM_MATCHER_ARM_HPP

  // Defined within class Matcher

  // No scaling for the parameter the ClearArray node.
  static const bool init_array_count_is_in_bytes = true;

  // Whether this platform implements the scalable vector feature
  static const bool implements_scalable_vector = false;

  static constexpr bool supports_scalable_vector() {
    return false;
  }

  // ARM doesn't support misaligned vectors store/load.
  static constexpr bool misaligned_vectors_ok() {
    return false;
  }

  // Whether code generation need accurate ConvI2L types.
  static const bool convi2l_type_required = true;

  // Do we need to mask the count passed to shift instructions or does
  // the cpu only look at the lower 5/6 bits anyway?
  // FIXME: does this handle vector shifts as well?
  static const bool need_masked_shift_count = true;

  // Does the CPU require late expand (see block.cpp for description of late expand)?
  static const bool require_postalloc_expand = false;

  // No support for generic vector operands.
  static const bool supports_generic_vector_operands = false;

  static constexpr bool isSimpleConstant64(jlong value) {
    // Will one (StoreL ConL) be cheaper than two (StoreI ConI)?.
    return false;
  }

  // Needs 2 CMOV's for longs.
  static constexpr int long_cmove_cost() { return 2; }

  // CMOVF/CMOVD are expensive on ARM.
  static int float_cmove_cost() { return ConditionalMoveLimit; }

  static bool narrow_oop_use_complex_address() {
    NOT_LP64(ShouldNotCallThis());
    assert(UseCompressedOops, "only for compressed oops code");
    return false;
  }

  static bool narrow_klass_use_complex_address() {
    NOT_LP64(ShouldNotCallThis());
    assert(UseCompressedClassPointers, "only for compressed klass code");
    return false;
  }

  static bool const_oop_prefer_decode() {
    NOT_LP64(ShouldNotCallThis());
    return true;
  }

  static bool const_klass_prefer_decode() {
    NOT_LP64(ShouldNotCallThis());
    return true;
  }

  // Is it better to copy float constants, or load them directly from memory?
  // Intel can load a float constant from a direct address, requiring no
  // extra registers.  Most RISCs will have to materialize an address into a
  // register first, so they would do better to copy the constant from stack.
  static const bool rematerialize_float_constants = false;

  // If CPU can load and store mis-aligned doubles directly then no fixup is
  // needed.  Else we split the double into 2 integer pieces and move it
  // piece-by-piece.  Only happens when passing doubles into C code as the
  // Java calling convention forces doubles to be aligned.
  static const bool misaligned_doubles_ok = false;

  // Advertise here if the CPU requires explicit rounding operations to implement strictfp mode.
  static const bool strict_fp_requires_explicit_rounding = false;

  // Are floats converted to double when stored to stack during deoptimization?
  // ARM does not handle callee-save floats.
  static constexpr bool float_in_double() {
    return false;
  }

  // Do ints take an entire long register or just half?
  // Note that we if-def off of _LP64.
  // The relevant question is how the int is callee-saved.  In _LP64
  // the whole long is written but de-opt'ing will have to extract
  // the relevant 32 bits, in not-_LP64 only the low 32 bits is written.
#ifdef _LP64
  static const bool int_in_long = true;
#else
  static const bool int_in_long = false;
#endif

  // Does the CPU supports vector variable shift instructions?
  static bool supports_vector_variable_shifts(void) {
    return VM_Version::has_simd();
  }

  // Does the CPU supports vector variable rotate instructions?
  static constexpr bool supports_vector_variable_rotates(void) {
    return false; // not supported
  }

  // Does the CPU supports vector constant rotate instructions?
  static constexpr bool supports_vector_constant_rotates(int shift) {
    return false;
  }

  // Does the CPU supports vector unsigned comparison instructions?
  static constexpr bool supports_vector_comparison_unsigned(int vlen, BasicType bt) {
    return false;
  }

  // Some microarchitectures have mask registers used on vectors
  static constexpr bool has_predicated_vectors(void) {
    return false;
  }

  // true means we have fast l2f conversion
  // false means that conversion is done by runtime call
  static constexpr bool convL2FSupported(void) {
      return false;
  }

  // Implements a variant of EncodeISOArrayNode that encode ASCII only
  static const bool supports_encode_ascii_array = false;

  // Returns pre-selection estimated size of a vector operation.
  static int vector_op_pre_select_sz_estimate(int vopc, BasicType ety, int vlen) {
    switch(vopc) {
      default: return 0;
      case Op_RoundVF: // fall through
      case Op_RoundVD: {
        return 30;
      }
    }
  }
  // Returns pre-selection estimated size of a scalar operation.
  static int scalar_op_pre_select_sz_estimate(int vopc, BasicType ety) {
    switch(vopc) {
      default: return 0;
      case Op_RoundF: // fall through
      case Op_RoundD: {
        return 30;
      }
    }
  }

#endif // CPU_ARM_MATCHER_ARM_HPP

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