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deps: fix v8 armv6 run-time detection #559

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merged 3 commits into from
Jan 22, 2015
Merged

deps: fix v8 armv6 run-time detection #559

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297cadb
deps: fix v8 armv6 run-time detection
bnoordhuis Jan 22, 2015
7d9d756
configure: disable vfpv3 on armv6
bnoordhuis Jan 22, 2015
c6cd460
configure: remove unused arm_neon variable
bnoordhuis Jan 22, 2015
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13 changes: 3 additions & 10 deletions configure
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Original file line number Diff line number Diff line change
Expand Up @@ -406,11 +406,6 @@ def is_arch_armv6():
'__ARM_ARCH_6M__' in cc_macros_cache)


def is_arm_neon():
"""Check for ARM NEON support"""
return '__ARM_NEON__' in cc_macros()


def is_arm_hard_float_abi():
"""Check for hardfloat or softfloat eabi on ARM"""
# GCC versions 4.6 and above define __ARM_PCS or __ARM_PCS_VFP to specify
Expand Down Expand Up @@ -468,14 +463,12 @@ def configure_arm(o):
arm_float_abi = 'default'

if is_arch_armv7():
o['variables']['arm_fpu'] = 'vfpv3'
o['variables']['arm_version'] = '7'
elif is_arch_armv6():
o['variables']['arm_version'] = '6'
else:
o['variables']['arm_version'] = 'default'
o['variables']['arm_fpu'] = 'vfpv2'
o['variables']['arm_version'] = '6' if is_arch_armv6() else 'default'

o['variables']['arm_fpu'] = 'vfpv3' # V8 3.18 no longer supports VFP2.
o['variables']['arm_neon'] = int(is_arm_neon())
o['variables']['arm_thumb'] = 0 # -marm
o['variables']['arm_float_abi'] = arm_float_abi

Expand Down
11 changes: 10 additions & 1 deletion deps/v8/src/base/cpu.cc
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Expand Up @@ -438,7 +438,7 @@ CPU::CPU()
//
// See http://code.google.com/p/android/issues/detail?id=10812
//
// We try to correct this by looking at the 'elf_format'
// We try to correct this by looking at the 'elf_platform'
// field reported by the 'Processor' field, which is of the
// form of "(v7l)" for an ARMv7-based CPU, and "(v6l)" for
// an ARMv6-one. For example, the Raspberry Pi is one popular
Expand All @@ -450,6 +450,15 @@ CPU::CPU()
}
delete[] processor;
}

// elf_platform moved to the model name field in Linux v3.8.
if (architecture_ == 7) {
char* processor = cpu_info.ExtractField("model name");
if (HasListItem(processor, "(v6l)")) {
architecture_ = 6;
}
delete[] processor;
}
}

// Try to extract the list of CPU features from ELF hwcaps.
Expand Down