1# Copyright 2019 The Chromium Authors. All rights reserved.
2# Use of this source code is governed by a BSD-style license that can be
3# found in the LICENSE file.
4
5declare_args() {
6  # Version of the ARM processor when compiling on ARM. Ignored on non-ARM
7  # platforms.
8  arm_version = 7
9
10  # The ARM architecture. This will be a string like "armv6" or "armv7-a".
11  # An empty string means to use the default for the arm_version. Getting
12  # a proper list of supported architectures is challenging for clang, but
13  # can be found in the triple.h header in the LLVM source, under the
14  # SubArchType enum.
15  arm_arch = "armv7-a"
16
17  # The ARM floating point hardware. This will be a string like "neon" or
18  # "vfpv3".
19  arm_fpu = "vfpv3-d16"
20
21  # The ARM floating point mode. This is either the string "hard", "soft", or
22  # "softfp".
23  arm_float_abi = "hard"
24
25  # The ARM variant-specific tuning mode. This will be a string like "armv6"
26  # or "cortex-a15". Each cpu-type has a different tuning value.
27  arm_tune = "generic-armv7-a"
28}
29
30declare_args() {
31  # Whether to use the neon FPU instruction set or not. Actual value is set
32  # below, based on the arm_fpu argument.
33  arm_use_neon = arm_fpu == "neon"
34}
35
36if (current_cpu == "arm64") {
37  # arm64 supports only "hard".
38  arm_float_abi = "hard"
39  arm_fpu = "neon"
40  arm_use_neon = true
41}
42
43assert(arm_float_abi == "hard" || arm_float_abi == "soft" ||
44       arm_float_abi == "softfp")
45assert(arm_version == 6 || arm_version == 7 || arm_version == 8)
46