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127 lines
3.4 KiB
Plaintext
127 lines
3.4 KiB
Plaintext
# Copyright 2014 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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import("//build/config/v8_target_cpu.gni")
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# These are primarily relevant in current_cpu == "arm" contexts, where
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# ARM code is being compiled. But they can also be relevant in the
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# other contexts when the code will change its behavior based on the
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# cpu it wants to generate code for.
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if (current_cpu == "arm" || v8_current_cpu == "arm") {
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declare_args() {
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# Version of the ARM processor when compiling on ARM. Ignored on non-ARM
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# platforms.
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arm_version = 7
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# The ARM architecture. This will be a string like "armv6" or "armv7-a".
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# An empty string means to use the default for the arm_version.
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arm_arch = ""
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# The ARM floating point hardware. This will be a string like "neon" or
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# "vfpv3". An empty string means to use the default for the arm_version.
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arm_fpu = ""
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# The ARM variant-specific tuning mode. This will be a string like "armv6"
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# or "cortex-a15". An empty string means to use the default for the
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# arm_version.
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arm_tune = ""
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# Whether to use the neon FPU instruction set or not.
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arm_use_neon = ""
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# Whether to enable optional NEON code paths.
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arm_optionally_use_neon = false
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# Thumb is a reduced instruction set available on some ARM processors that
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# has increased code density.
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arm_use_thumb = true
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}
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if (current_os == "android" || target_os == "android") {
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arm_float_abi = "softfp"
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} else {
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declare_args() {
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# The ARM floating point mode. This is either the string "hard", "soft",
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# or "softfp". An empty string means to use the default one for the
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# arm_version.
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arm_float_abi = ""
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}
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}
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assert(arm_float_abi == "" || arm_float_abi == "hard" ||
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arm_float_abi == "soft" || arm_float_abi == "softfp")
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if (arm_use_neon == "") {
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if (current_os == "linux" && target_cpu != v8_target_cpu) {
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# Don't use neon on V8 simulator builds as a default.
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arm_use_neon = false
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} else {
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arm_use_neon = true
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}
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}
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if (arm_version == 6) {
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if (arm_arch == "") {
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arm_arch = "armv6"
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}
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if (arm_tune != "") {
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arm_tune = ""
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}
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if (arm_float_abi == "") {
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arm_float_abi = "softfp"
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}
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if (arm_fpu == "") {
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arm_fpu = "vfp"
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}
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arm_use_thumb = false
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arm_use_neon = false
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} else if (arm_version == 7) {
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if (arm_arch == "") {
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arm_arch = "armv7-a"
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}
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if (arm_tune == "") {
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arm_tune = "generic-armv7-a"
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}
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if (arm_float_abi == "") {
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if (current_os == "linux" && target_cpu != v8_target_cpu) {
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# Default to the same as Android for V8 simulator builds.
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arm_float_abi = "softfp"
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} else {
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arm_float_abi = "hard"
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}
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}
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if (arm_fpu == "") {
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if (arm_use_neon) {
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arm_fpu = "neon"
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} else {
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arm_fpu = "vfpv3-d16"
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}
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}
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} else if (arm_version == 8) {
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if (arm_arch == "") {
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arm_arch = "armv8-a"
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}
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if (arm_tune == "") {
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arm_tune = "generic-armv8-a"
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}
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if (arm_float_abi == "") {
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arm_float_abi = "hard"
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}
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if (arm_fpu == "") {
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if (arm_use_neon) {
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arm_fpu = "neon"
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} else {
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arm_fpu = "vfpv3-d16"
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}
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}
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}
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} else if (current_cpu == "arm64" || v8_current_cpu == "arm64") {
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# arm64 supports only "hard".
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arm_float_abi = "hard"
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arm_use_neon = true
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}
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