build/config/arm.gni

# Copyright 2019 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

declare_args() {
  # Version of the ARM processor when compiling on ARM. Ignored on non-ARM
  # platforms.
  arm_version = 7

  # The ARM architecture. This will be a string like "armv6" or "armv7-a".
  # An empty string means to use the default for the arm_version. Getting
  # a proper list of supported architectures is challenging for clang, but
  # can be found in the triple.h header in the LLVM source, under the
  # SubArchType enum.
  arm_arch = "armv7-a"

  # The ARM floating point hardware. This will be a string like "neon" or
  # "vfpv3".
  arm_fpu = "vfpv3-d16"

  # The ARM floating point mode. This is either the string "hard", "soft", or
  # "softfp".
  arm_float_abi = "hard"

  # The ARM variant-specific tuning mode. This will be a string like "armv6"
  # or "cortex-a15". Each cpu-type has a different tuning value.
  arm_tune = "generic-armv7-a"
}

declare_args() {
  # Whether to use the neon FPU instruction set or not. Actual value is set
  # below, based on the arm_fpu argument.
  arm_use_neon = arm_fpu == "neon"
}

if (current_cpu == "arm64") {
  # arm64 supports only "hard".
  arm_float_abi = "hard"
  arm_fpu = "neon"
  arm_use_neon = true
}

assert(arm_float_abi == "hard" || arm_float_abi == "soft" ||
       arm_float_abi == "softfp")
assert(arm_version == 6 || arm_version == 7 || arm_version == 8)