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 if (cpu_arch == "arm") { 6 declare_args() { 7 # Version of the ARM processor when compiling on ARM. Ignored on non-ARM 8 # platforms. 9 arm_version = 7 10 11 # The ARM floating point mode. This is either the string "hard", "soft", or 12 # "softfp". An empty string means to use the default one for the 13 # arm_version. 14 arm_float_abi = "" 15 16 # The ARM variant-specific tuning mode. This will be a string like "armv6" 17 # or "cortex-a15". An empty string means to use the default for the 18 # arm_version. 19 arm_tune = "" 20 21 # Whether to use the neon FPU instruction set or not. 22 arm_use_neon = true 23 } 24 25 assert(arm_float_abi == "" || 26 arm_float_abi == "hard" || 27 arm_float_abi == "soft" || 28 arm_float_abi == "softfp") 29 30 if (is_android) { 31 arm_use_neon = false 32 } 33 arm_optionally_use_neon = true 34 35 if (arm_version == 6) { 36 arm_arch = "armv6" 37 if (arm_tune != "") { 38 arm_tune = "" 39 } 40 if (arm_float_abi == "") { 41 arm_float_abi = "softfp" 42 } 43 arm_fpu = "vfp" 44 # Thumb is a reduced instruction set available on some ARM processors that 45 # has increased code density. 46 arm_use_thumb = false 47 48 } else if (arm_version == 7) { 49 arm_arch = "armv7-a" 50 if (arm_tune == "") { 51 arm_tune = "generic-armv7-a" 52 } 53 54 if (arm_float_abi == "") { 55 arm_float_abi = "softfp" 56 } 57 58 arm_use_thumb = true 59 60 if (arm_use_neon) { 61 arm_fpu = "neon" 62 } else { 63 arm_fpu = "vfpv3-d16" 64 } 65 } 66 } 67
