Re: Does ARMEL toolchain include NEON support?
On Wed, Feb 27, 2019 at 04:59:50PM -0500, Jeffrey Walton wrote:
>On Wed, Feb 27, 2019 at 4:01 PM Steve McIntyre <steve@einval.com> wrote:
>>
>> OK. In your build log I can see
>>
>> n file included from aria_simd.cpp:19:
>> /usr/lib/gcc/arm-linux-gnueabi/8/include/arm_neon.h:31:2: error: #error "NEON intrinsics not available with the soft-float ABI. Please use -mfloat-abi=softfp or -mfloat-abi=hard"
>> #error "NEON intrinsics not available with the soft-float ABI. Please use -mfloat-abi=softfp or -mfloat-abi=hard"
>>
>> What errors do you get if you try -mfloat-abi=softfp (etc.)?
>
>I seem to recall László Böszörményi, who is our package maintainer,
>ran that test for us. It also failed. I believe it was roughly the
>same error for both hard and soft floats.
Right, OK. gcc can be infuriating at times like this. :-)
>> To be able to use NEON support you may also have to specify a CPU/FPU
>> combination that includes it - the default armel setup it for ARMv5
>> which is not going to help you.
>
>Yeah, the problem is centered around this. When we test for NEON we
>include -march=armv7-a. The GNUmakefile does this
>(https://github.com/weidai11/cryptopp/blob/master/GNUmakefile):
>
>HOSTX := $(shell $(CXX) $(CXXFLAGS) -dumpmachine 2>/dev/null | cut -f 1 -d '-')
>IS_ARM32 := $(shell echo "$(HOSTX)" | $(GREP) -i -c -E 'arm|armhf|arm7l|eabihf')
>IS_NEON := $(shell $(CXX) $(CXXFLAGS) -dumpmachine 2>/dev/null |
>$(GREP) -i -c -E 'armv7|armhf|arm7l|eabihf|armv8|aarch32|aarch64')
>
>Then, it does this:
>
>ifeq ($(IS_ARM32)$(IS_NEON),11)
>
> TPROG = TestPrograms/test_arm_neon.cxx
> TOPT = -march=armv7-a -mfloat-abi=$(FP_ABI) -mfpu=neon
> HAVE_OPT = $(shell $(CXX) $(TCXXFLAGS) $(ZOPT) $(TOPT) $(TPROG) -o
>$(TOUT) 2>&1 | tr ' ' '\n' | wc -l)
> ifeq ($(strip $(HAVE_OPT)),0)
> NEON_FLAG = -march=armv7-a -mfloat-abi=$(FP_ABI) -mfpu=neon
> ....
>endif
>
>When we detect ARM32 and NEON is available using a test compile, then
>we enable IS_NEON . I'm thinking IS_ARM32 or IS_NEON is misdetecting.
>The feature test works well elsewhere, including x86, x86_64, Aarch32,
>Aarch64, MIPS, MIPS64, PPC, PPC64, etc.
>
>The problem is, I don't know what the output of or 'g++ -dumpmachine'
>or 'uname -m' are, so I am not sure if we are misdetecting IS_ARM32 or
>IS_NEON .
So, I've got to ask - what hardware are you likely targeting here
where it matters to build stuff for armel yet also use NEON if it's
available? Most people with hardware that *can* do NEON should be
using armhf, surely?
>I wrote to the guys who maintain the build system and asked them to
>provide the explicit output of the commands with the logs. They told
>me the information was there without the need for providing the output
>g++ -dumpmachine' or 'uname -m'.
Helpful... :-/
>(My hunch is 'g++ -dumpmachine' is returning something other than what
>we expect. Maybe something like 'armel'. I won't know for certain
>until I see the output of the commands, but which Debian refuses to
>provide).
You can work this out if you have access to a Debian porter box or
similar. But, for the sake of being helpful I see the following in an
armel chroot locally:
(sid-armel)steve@mjolnir:~$ g++ -dumpmachine
arm-linux-gnueabi
But that's not very instructive. More usefully, you can see what's
defined by the compiler if you do the following (LONG output!):
(sid-armel)steve@mjolnir:~$ g++ -dM -E -x c++ - < /dev/null
#define __DBL_MIN_EXP__ (-1021)
#define __HQ_FBIT__ 15
#define __FLT32X_MAX_EXP__ 1024
#define __cpp_attributes 200809
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#define __ARM_SIZEOF_WCHAR_T 4
#define __ATOMIC_ACQUIRE 2
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#define __GCC_IEC_559_COMPLEX 0
#define __cpp_aggregate_nsdmi 201304
#define __UFRACT_MAX__ 0XFFFFP-16UR
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#define __WINT_MAX__ 0xffffffffU
#define __FLT32_MIN_EXP__ (-125)
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#define __ULLFRACT_MAX__ 0XFFFFFFFFFFFFFFFFP-64ULLR
#define __UINT_FAST8_TYPE__ unsigned char
#define _GNU_SOURCE 1
#define __USFRACT_EPSILON__ 0x1P-8UHR
#define __ULACCUM_FBIT__ 32
#define __ARM_FEATURE_DSP 1
#define __QQ_IBIT__ 0
#define __cpp_init_captures 201304
#define __ATOMIC_ACQ_REL 4
#define __ATOMIC_RELEASE 3
*phew*
Does that help you?
--
Steve McIntyre, Cambridge, UK. steve@einval.com
"Arguing that you don't care about the right to privacy because you have
nothing to hide is no different than saying you don't care about free
speech because you have nothing to say."
-- Edward Snowden
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