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Commit 7f429e62 authored by rmcilroy@chromium.org's avatar rmcilroy@chromium.org
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[Arm]: Simplify compile-time Arm feature detection. 

Simplify the compile time feature detection on Arm:
 - Define CAN_USE_XXX definitions unconditionally for all target/host
   toolchain combinations
 - Rename arm_test / ARM_TEST to arm_test_noprob / ARM_TEST_NO_FEATURE_PROBE
 - Don't set ARM_TEST_NO_FEATURE_PROBE implicitly on the simulator to make
   make simulator / native more consistent
 - Unify CpuFeatures::PrintTarget for simulator and native builds
 - Remove unecessary CAN_USE_VFP_INSTRUCTIONS definition for android (this is
   the default for arm_fpu=default)
 - Add a CpuFeatures::Probe() before calling CpuFeatures::PrintFeatures() in PrintHelp
    to ensure we have probed features before printing them.

BUG=384474
LOG=N
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/340373002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21935 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
parent a818a3e7
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Showing with 65 additions and 139 deletions
Makefile
View file @ 7f429e62
......@@ -191,15 +191,14 @@ ifeq ($(armthumb), on)
GYPFLAGS += -Darm_thumb=1
endif
endif
# armtest=on
# arm_test_noprobe=on
# With this flag set, by default v8 will only use features implied
# by the compiler (no probe). This is done by modifying the default
# values of enable_armv7, enable_vfp3, enable_32dregs and enable_neon.
# Modifying these flags when launching v8 will enable the probing for
# the specified values.
# When using the simulator, this flag is implied.
ifeq ($(armtest), on)
GYPFLAGS += -Darm_test=on
ifeq ($(arm_test_noprobe), on)
GYPFLAGS += -Darm_test_noprobe=on
endif
# ----------------- available targets: --------------------
......
build/toolchain.gypi
View file @ 7f429e62
......@@ -47,7 +47,7 @@
# these registers in the snapshot and use CPU feature probing when running
# on the target.
'v8_can_use_vfp32dregs%': 'false',
'arm_test%': 'off',
'arm_test_noprobe%': 'off',
# Similar to vfp but on MIPS.
'v8_can_use_fpu_instructions%': 'true',
......@@ -89,6 +89,36 @@
'defines': [
'V8_TARGET_ARCH_ARM',
],
'conditions': [
[ 'arm_version==7 or arm_version=="default"', {
'defines': [
'CAN_USE_ARMV7_INSTRUCTIONS',
],
}],
[ 'arm_fpu=="vfpv3-d16" or arm_fpu=="default"', {
'defines': [
'CAN_USE_VFP3_INSTRUCTIONS',
],
}],
[ 'arm_fpu=="vfpv3"', {
'defines': [
'CAN_USE_VFP3_INSTRUCTIONS',
'CAN_USE_VFP32DREGS',
],
}],
[ 'arm_fpu=="neon"', {
'defines': [
'CAN_USE_VFP3_INSTRUCTIONS',
'CAN_USE_VFP32DREGS',
'CAN_USE_NEON',
],
}],
[ 'arm_test_noprobe=="on"', {
'defines': [
'ARM_TEST_NO_FEATURE_PROBE',
],
}],
],
'target_conditions': [
['_toolset=="host"', {
'variables': {
......@@ -116,45 +146,10 @@
[ 'arm_thumb==0', {
'cflags': ['-marm',],
}],
[ 'arm_test=="on"', {
'defines': [
'ARM_TEST',
],
}],
],
}, {
# armcompiler=="no"
'conditions': [
[ 'arm_version==7 or arm_version=="default"', {
'defines': [
'CAN_USE_ARMV7_INSTRUCTIONS=1',
],
'conditions': [
[ 'arm_fpu=="default"', {
'defines': [
'CAN_USE_VFP3_INSTRUCTIONS',
],
}],
[ 'arm_fpu=="vfpv3-d16"', {
'defines': [
'CAN_USE_VFP3_INSTRUCTIONS',
],
}],
[ 'arm_fpu=="vfpv3"', {
'defines': [
'CAN_USE_VFP3_INSTRUCTIONS',
'CAN_USE_VFP32DREGS',
],
}],
[ 'arm_fpu=="neon"', {
'defines': [
'CAN_USE_VFP3_INSTRUCTIONS',
'CAN_USE_VFP32DREGS',
'CAN_USE_NEON',
],
}],
],
}],
[ 'arm_float_abi=="hard"', {
'defines': [
'USE_EABI_HARDFLOAT=1',
......@@ -166,9 +161,6 @@
],
}],
],
'defines': [
'ARM_TEST',
],
}],
],
}], # _toolset=="host"
......@@ -198,67 +190,10 @@
[ 'arm_thumb==0', {
'cflags': ['-marm',],
}],
[ 'arm_test=="on"', {
'defines': [
'ARM_TEST',
],
'conditions': [
[ 'arm_fpu=="vfpv3-d16"', {
'defines': [
'CAN_USE_VFP3_INSTRUCTIONS',
],
}],
[ 'arm_fpu=="vfpv3"', {
'defines': [
'CAN_USE_VFP3_INSTRUCTIONS',
'CAN_USE_VFP32DREGS',
],
}],
[ 'arm_fpu=="neon"', {
'defines': [
'CAN_USE_VFP3_INSTRUCTIONS',
'CAN_USE_VFP32DREGS',
'CAN_USE_NEON',
],
}],
],
}],
],
}, {
# armcompiler=="no"
'conditions': [
[ 'arm_version==7 or arm_version=="default"', {
'defines': [
'CAN_USE_ARMV7_INSTRUCTIONS=1',
],
'conditions': [
[ 'arm_fpu=="default"', {
'defines': [
'CAN_USE_VFP3_INSTRUCTIONS',
'CAN_USE_VFP32DREGS',
'CAN_USE_NEON',
],
}],
[ 'arm_fpu=="vfpv3-d16"', {
'defines': [
'CAN_USE_VFP3_INSTRUCTIONS',
],
}],
[ 'arm_fpu=="vfpv3"', {
'defines': [
'CAN_USE_VFP3_INSTRUCTIONS',
'CAN_USE_VFP32DREGS',
],
}],
[ 'arm_fpu=="neon"', {
'defines': [
'CAN_USE_VFP3_INSTRUCTIONS',
'CAN_USE_VFP32DREGS',
'CAN_USE_NEON',
],
}],
],
}],
[ 'arm_float_abi=="hard"', {
'defines': [
'USE_EABI_HARDFLOAT=1',
......@@ -270,9 +205,6 @@
],
}],
],
'defines': [
'ARM_TEST',
],
}],
],
}], # _toolset=="target"
......
src/arm/assembler-arm.cc
View file @ 7f429e62
......@@ -129,56 +129,53 @@ void CpuFeatures::ProbeImpl(bool cross_compile) {
void CpuFeatures::PrintTarget() {
const char* arm_arch = NULL;
const char* arm_test = "";
const char* arm_target_type = "";
const char* arm_no_probe = "";
const char* arm_fpu = "";
const char* arm_thumb = "";
const char* arm_float_abi = NULL;
#if !defined __arm__
arm_target_type = " simulator";
#endif
#if defined ARM_TEST_NO_FEATURE_PROBE
arm_no_probe = " noprobe";
#endif
#if defined CAN_USE_ARMV7_INSTRUCTIONS
arm_arch = "arm v7";
#else
arm_arch = "arm v6";
#endif
#ifdef __arm__
# ifdef ARM_TEST
arm_test = " test";
# endif
# if defined __ARM_NEON__
#if defined CAN_USE_NEON
arm_fpu = " neon";
# elif defined CAN_USE_VFP3_INSTRUCTIONS
arm_fpu = " vfp3";
# else
arm_fpu = " vfp2";
# endif
# if (defined __thumb__) || (defined __thumb2__)
arm_thumb = " thumb";
# endif
arm_float_abi = OS::ArmUsingHardFloat() ? "hard" : "softfp";
#else // __arm__
arm_test = " simulator";
# if defined CAN_USE_VFP3_INSTRUCTIONS
#elif defined CAN_USE_VFP3_INSTRUCTIONS
# if defined CAN_USE_VFP32DREGS
arm_fpu = " vfp3";
# else
arm_fpu = " vfp3-d16";
# endif
# else
#else
arm_fpu = " vfp2";
# endif
# if USE_EABI_HARDFLOAT == 1
#endif
#ifdef __arm__
arm_float_abi = OS::ArmUsingHardFloat() ? "hard" : "softfp";
#elif USE_EABI_HARDFLOAT
arm_float_abi = "hard";
# else
#else
arm_float_abi = "softfp";
# endif
#endif
#endif // __arm__
#if defined __arm__ && (defined __thumb__) || (defined __thumb2__)
arm_thumb = " thumb";
#endif
printf("target%s %s%s%s %s\n",
arm_test, arm_arch, arm_fpu, arm_thumb, arm_float_abi);
printf("target%s%s %s%s%s %s\n",
arm_target_type, arm_no_probe, arm_arch, arm_fpu, arm_thumb,
arm_float_abi);
}
......
src/flag-definitions.h
View file @ 7f429e62
......@@ -105,22 +105,22 @@ struct MaybeBoolFlag {
};
#endif
#if (defined CAN_USE_VFP3_INSTRUCTIONS) || !(defined ARM_TEST)
#if (defined CAN_USE_VFP3_INSTRUCTIONS) || !(defined ARM_TEST_NO_FEATURE_PROBE)
# define ENABLE_VFP3_DEFAULT true
#else
# define ENABLE_VFP3_DEFAULT false
#endif
#if (defined CAN_USE_ARMV7_INSTRUCTIONS) || !(defined ARM_TEST)
#if (defined CAN_USE_ARMV7_INSTRUCTIONS) || !(defined ARM_TEST_NO_FEATURE_PROBE)
# define ENABLE_ARMV7_DEFAULT true
#else
# define ENABLE_ARMV7_DEFAULT false
#endif
#if (defined CAN_USE_VFP32DREGS) || !(defined ARM_TEST)
#if (defined CAN_USE_VFP32DREGS) || !(defined ARM_TEST_NO_FEATURE_PROBE)
# define ENABLE_32DREGS_DEFAULT true
#else
# define ENABLE_32DREGS_DEFAULT false
#endif
#if (defined CAN_USE_NEON) || !(defined ARM_TEST)
#if (defined CAN_USE_NEON) || !(defined ARM_TEST_NO_FEATURE_PROBE)
# define ENABLE_NEON_DEFAULT true
#else
# define ENABLE_NEON_DEFAULT false
......
src/flags.cc
View file @ 7f429e62
......@@ -517,6 +517,7 @@ void FlagList::ResetAllFlags() {
// static
void FlagList::PrintHelp() {
CpuFeatures::Probe(false);
CpuFeatures::PrintTarget();
CpuFeatures::PrintFeatures();
......
tools/gyp/v8.gyp
View file @ 7f429e62
......@@ -837,9 +837,6 @@
}
],
['OS=="android"', {
'defines': [
'CAN_USE_VFP_INSTRUCTIONS',
],
'sources': [
'../../src/platform-posix.cc'
],
......
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