Comment #14 on issue 3112 by [email protected]: v8 goes into SIGILL on
latest Raspbian wheezy
http://code.google.com/p/v8/issues/detail?id=3112
No, this is not compiler defaults. Interresting is that ARMv7={0|1} also
depends on kernel (same d8 build !!):
on Linux raspberrypi 3.6.11+ #557 PREEMPT Wed Oct 2 18:49:09 BST 2013
armv6l GNU/Linux
# LD_LIBRARY_PATH=. ./d8 --help | head -n 3
target arm v6 vfp2 hard
std 0000
ARMv7=0 VFP3=0 VFP32DREGS=0 NEON=0 SUDIV=0 UNALIGNED_ACCESSES=0
MOVW_MOVT_IMMEDIATE_LOADS=0 USE_EABI_HARDFLOAT=1
on Linux raspberrypi 3.10.18+ #577 Tue Nov 5 12:33:36 GMT 2013 armv6l
GNU/Linux
# LD_LIBRARY_PATH=. ./d8 --help | head -n 4
target arm v6 vfp2 hard
std 0000
cpu arch 1 1 1
ARMv7=1 VFP3=0 VFP32DREGS=0 NEON=0 SUDIV=0 UNALIGNED_ACCESSES=1
MOVW_MOVT_IMMEDIATE_LOADS=0 USE_EABI_HARDFLOAT=1
Here you see some debug lines I've introduced in CpuFeatures::Probe() in
arm/assembler-arm.cc:
std 0000 - prints standard_features variable:
printf("std %x%x%x%x\n", (unsigned) ((standard_features >> 48) &&
0xffff), (unsigned)((standard_features >> 32) && 0xffff),
(unsigned)((standard_features >> 16) && 0xffff),
(unsigned)(standard_features && 0xffff)); // !!!+
supported_ |= standard_features;
cpu arch 1 1 1 - prints CPU features detected:
if (!IsSupported(ARMv7) && FLAG_enable_armv7 && cpu.architecture() >= 7) {
printf("cpu arch %u %u %u\n", !IsSupported(ARMv7), FLAG_enable_armv7,
cpu.architecture() >= 7); // !!!+++
found_by_runtime_probing_only_ |= static_cast<uint64_t>(1) << ARMv7;
}
In others words, cpu.architecture() >= 7 returns different things in two
kernels.
Any idea why?
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