Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame^] | 1 | # Copyright 2014 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 | |
| 5 | # These are primarily relevant in current_cpu == "arm" contexts, where |
| 6 | # ARM code is being compiled. But they can also be relevant in the |
| 7 | # host toolchain context when target_cpu == "arm", where a host-side |
| 8 | # build tool being built will change its behavior depending on the |
| 9 | # details of the target configuration. |
| 10 | if (target_cpu == "arm" || current_cpu == "arm") { |
| 11 | declare_args() { |
| 12 | # Version of the ARM processor when compiling on ARM. Ignored on non-ARM |
| 13 | # platforms. |
| 14 | arm_version = 7 |
| 15 | |
| 16 | # The ARM floating point mode. This is either the string "hard", "soft", or |
| 17 | # "softfp". An empty string means to use the default one for the |
| 18 | # arm_version. |
| 19 | arm_float_abi = "" |
| 20 | |
| 21 | # The ARM variant-specific tuning mode. This will be a string like "armv6" |
| 22 | # or "cortex-a15". An empty string means to use the default for the |
| 23 | # arm_version. |
| 24 | arm_tune = "" |
| 25 | |
| 26 | # Whether to use the neon FPU instruction set or not. |
| 27 | arm_use_neon = true |
| 28 | |
| 29 | # Whether to enable optional NEON code paths. |
| 30 | arm_optionally_use_neon = false |
| 31 | |
| 32 | # Thumb is a reduced instruction set available on some ARM processors that |
| 33 | # has increased code density. |
| 34 | arm_use_thumb = true |
| 35 | } |
| 36 | |
| 37 | assert(arm_float_abi == "" || arm_float_abi == "hard" || |
| 38 | arm_float_abi == "soft" || arm_float_abi == "softfp") |
| 39 | |
| 40 | if (arm_version == 6) { |
| 41 | arm_arch = "armv6" |
| 42 | if (arm_tune != "") { |
| 43 | arm_tune = "" |
| 44 | } |
| 45 | if (arm_float_abi == "") { |
| 46 | arm_float_abi = "softfp" |
| 47 | } |
| 48 | arm_fpu = "vfp" |
| 49 | arm_use_thumb = false |
| 50 | } else if (arm_version == 7) { |
| 51 | arm_arch = "armv7-a" |
| 52 | if (arm_tune == "") { |
| 53 | arm_tune = "generic-armv7-a" |
| 54 | } |
| 55 | |
| 56 | if (arm_float_abi == "") { |
| 57 | if (current_os == "android" || target_os == "android") { |
| 58 | arm_float_abi = "softfp" |
| 59 | } else { |
| 60 | arm_float_abi = "hard" |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | if (arm_use_neon) { |
| 65 | arm_fpu = "neon" |
| 66 | } else { |
| 67 | arm_fpu = "vfpv3-d16" |
| 68 | } |
| 69 | } else if (arm_version == 8) { |
| 70 | arm_arch = "armv8-a" |
| 71 | if (arm_tune == "") { |
| 72 | arm_tune = "generic-armv8-a" |
| 73 | } |
| 74 | |
| 75 | if (arm_float_abi == "") { |
| 76 | if (current_os == "android" || target_os == "android") { |
| 77 | arm_float_abi = "softfp" |
| 78 | } else { |
| 79 | arm_float_abi = "hard" |
| 80 | } |
| 81 | } |
| 82 | |
| 83 | if (arm_use_neon) { |
| 84 | arm_fpu = "neon" |
| 85 | } else { |
| 86 | arm_fpu = "vfpv3-d16" |
| 87 | } |
| 88 | } |
| 89 | } else if (current_cpu == "arm64" || target_cpu == "arm64") { |
| 90 | # arm64 supports only "hard". |
| 91 | arm_float_abi = "hard" |
| 92 | arm_use_neon = true |
| 93 | arm_fpu = "cortex-a57+simd+crypto+fp+crc" |
| 94 | } |