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Build fails on Termux / aarch64 #413

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digikar99 opened this issue Feb 21, 2021 · 17 comments
Closed

Build fails on Termux / aarch64 #413

digikar99 opened this issue Feb 21, 2021 · 17 comments

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@digikar99
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digikar99 commented Feb 21, 2021 •
edited

Hi, thank you for this library!

I was looking to see if I could use this library for a project, and wanted to check the performance differences on an aarch64 android device I own. For this, I'm using Termux, and encountered the following errors on make. I think it's related to linking libm, but not sure where exactly the fix goes, or if there is a non-trivial amount of work required to make this work on Termux; will let you know if I find the fix.

See terminal output of `make`. 
[  2%] Built target mkrename_gnuabi
[  3%] Built target sleefgnuabiadvsimddp
[  4%] Built target sleefgnuabiadvsimdsp
[  5%] Built target sleefgnuabi
[  6%] Built target addSuffix
[  7%] Built target mkrename
[  8%] Built target renamedspscalar.h_generated
[  9%] Built target mkdisp
[ 10%] Built target dispscalar.c_generated
[ 14%] Built target headers
[ 15%] Built target dispscalar_obj
[ 16%] Built target renamePURECFMA_SCALAR.h_generated
[ 18%] Built target sleefdetpurecfma_scalar
[ 20%] Built target sleefpurecfma_scalar
[ 22%] Built target sleefscalar
[ 22%] Built target renamePUREC_SCALAR.h_generated
[ 23%] Built target sleefdetpurec_scalar
[ 25%] Built target sleefpurec_scalar
[ 26%] Built target renameADVSIMDNOFMA.h_generated
[ 27%] Built target sleefadvsimdnofma
[ 28%] Built target mkalias
[ 28%] Built target alias_advsimd.h_generated
[ 28%] Built target renameADVSIMD.h_generated
[ 30%] Built target sleefadvsimd
[ 30%] Built target common
[ 32%] Built target sleefdetadvsimdnofma
[ 34%] Built target sleefdetadvsimd
[ 35%] Built target sleef
[ 36%] Built target mkmasked_gnuabi
[ 37%] Linking C executable ../../bin/tester
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: CMakeFiles/tester.dir/tester.c.o: in function `do_test':
/data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:2335: undefined reference to `nextafter'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:2335: undefined reference to `nextafter'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:2343: undefined reference to `nextafter'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:2343: undefined reference to `nextafter'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:2351: undefined reference to `nextafter'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: CMakeFiles/tester.dir/tester.c.o:/data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:2351: more undefined references to `nextafter' follow
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: CMakeFiles/tester.dir/tester.c.o: in function `do_test':
/data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:2585: undefined reference to `ilogb'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:2586: undefined reference to `ilogb'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:2612: undefined reference to `nextafter'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:2931: undefined reference to `nextafterf'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:2931: undefined reference to `nextafterf'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:2935: undefined reference to `nextafterf'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:2935: undefined reference to `nextafterf'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:2944: undefined reference to `nextafterf'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: CMakeFiles/tester.dir/tester.c.o:/data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:2944: more undefined references to `nextafterf' follow
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: CMakeFiles/tester.dir/tester.c.o: in function `do_test':
/data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:(.text+0x36e40): undefined reference to `pow'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:3663: undefined reference to `pow'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:(.text+0x36f08): undefined reference to `pow'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:3663: undefined reference to `pow'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:3663: undefined reference to `pow'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: CMakeFiles/tester.dir/tester.c.o:/data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:(.text+0x37624): more undefined references to `pow' follow
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: CMakeFiles/tester.dir/tester.c.o: in function `do_test':
/data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:4177: undefined reference to `ilogb'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:4179: undefined reference to `ilogb'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:4187: undefined reference to `ilogb'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:4189: undefined reference to `ilogb'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:(.text+0x48b9c): undefined reference to `pow'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:4199: undefined reference to `ilogb'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:4201: undefined reference to `ilogb'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:(.text+0x48d08): undefined reference to `pow'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:4211: undefined reference to `ilogb'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:4213: undefined reference to `ilogb'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:(.text+0x4e304): undefined reference to `pow'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:4462: undefined reference to `pow'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:(.text+0x4e3d0): undefined reference to `pow'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:4462: undefined reference to `pow'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:4462: undefined reference to `pow'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: CMakeFiles/tester.dir/tester.c.o:/data/data/com.termux/files/home/sleef/src/libm-tester/tester.c:(.text+0x4eb04): more undefined references to `pow' follow
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: CMakeFiles/tester.dir/testerutil.c.o: in function `countULPdp':
/data/data/com.termux/files/home/sleef/src/libm-tester/testerutil.c:175: undefined reference to `frexp'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/testerutil.c:176: undefined reference to `ldexpl'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/testerutil.c:176: undefined reference to `fmaxl'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: CMakeFiles/tester.dir/testerutil.c.o: in function `countULP2dp':
/data/data/com.termux/files/home/sleef/src/libm-tester/testerutil.c:223: undefined reference to `frexp'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/testerutil.c:224: undefined reference to `ldexpl'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: /data/data/com.termux/files/home/sleef/src/libm-tester/testerutil.c:224: undefined reference to `fmaxl'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: CMakeFiles/tester.dir/testerutil.c.o: in function `countULPsp':
/data/data/com.termux/files/home/sleef/src/libm-tester/testerutil.c:256: undefined reference to `frexp'
/data/data/com.termux/files/usr/bin/aarch64-linux-android-ld: CMakeFiles/tester.dir/testerutil.c.o: in function `countULP2sp':
/data/data/com.termux/files/home/sleef/src/libm-tester/testerutil.c:283: undefined reference to `frexp'
clang-9: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [src/libm-tester/CMakeFiles/tester.dir/build.make:122: bin/tester] Error 1
make[1]: *** [CMakeFiles/Makefile2:1073: src/libm-tester/CMakeFiles/tester.dir/all] Error 2
make: *** [Makefile:161: all] Error 2
\```

</details>
@shibatch
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Hello,

Please check if specifying -DBUILD_TESTS=FALSE as a cmake option works.

@digikar99
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digikar99 commented Feb 21, 2021 •
edited

Hi, thanks!

Yes, make works, but make install fails; so need another installation prefix (edit: trying CMAKE_INSTALL_PREFIX; will get back if any issues!):

Install the project...
-- Install configuration: "Debug"
CMake Error at src/libm/cmake_install.cmake:52 (file):
  file cannot create directory: /usr/local/lib.  Maybe need administrative
  privileges.
Call Stack (most recent call first):
  src/cmake_install.cmake:42 (include)
  cmake_install.cmake:42 (include)


make: *** [Makefile:94: install] Error 1

@digikar99
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Yes cmake -DBUILD_TESTS=FALSE -DCMAKE_INSTALL_PREFIX=/data/data/com.termux/files/usr .. solves it.

As far as performance goes, Sleef_sinhf4_u10 and its other three variants are 10 times slower (Sleef_sin is 5 times slower) than the corresponding scalar variant packed with clang in Termux; I'd suspect non inlining has something to do with it, but not sure, and that's a separate issue.

This particular issue's complete resolution might require being able to compile and run the tests; but otherwise, things seem to work; thanks!

@shibatch
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Are you comparing scalar functions?
Scalar functions in SLEEF are not meant to be fast, as I wrote in the FAQ.

@shibatch
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5 times difference is too much.
Probably you are comparing wrong functions.

@digikar99
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I'm comparing the sleef's non-scalar versions with the libm's scalar versions. On x86_64, the speeds are comparable; however, on aarch64, the simd equivalents for sin and sinh provided by sleef are several times slower than the scalar versions provided by libm. (I'll upload a gist.)

@shibatch
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So you are comparing different functions. That’s not fair comparison.

@shibatch
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Depending on the CPU micro architecture, the FPU may not be vectorized internally. You should be careful when comparing performance.

@digikar99
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https://gist.github.com/digikar99/5c103a9c017c49d6cf9d9c5cfde3e60c

Depending on the CPU micro architecture

That could be it: are any of these features supposed to work (wrt performance) with arm_neon.h? Or, could you point to any resources for asimd if arm_neon.h in case not the way forward for asimd?

fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm lrcpc dcpop asimddp

@digikar99
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digikar99 commented Feb 21, 2021 •
edited

The index is always zero in your code.

The pointers are being incremented:

      a_ptr += 1;
      b_ptr += 1;

Or am I committing some human error by misreading something?

The calls to sin and sinh are optimized away.

If I actually comment out the b_ptr[0] = sin(a_ptr[0]);, then, it runs in 0.006 sec. With -S, I get the following assembly with the bl sin, which I'm guessing is the function call to sin:

gcc -O2 -fno-vectorize -S sin.c -lm && cat sin.s 
clang-9: warning: -lm: 'linker' input unused [-Wunused-command-line-argument]
        .text
        .file   "sin.c"
        .globl  main                    // -- Begin function main
        .p2align        2
        .type   main,@function
main:                                   // @main
// %bb.0:
        stp     x24, x23, [sp, #-64]!   // 16-byte Folded Spill
        mov     w9, #16384
        mov     w10, #16384
        adrp    x11, a
        mov     x8, xzr
        movk    w9, #50460, lsl #16
        movk    w10, #17820, lsl #16
        add     x11, x11, :lo12:a
        mov     w12, #5000
        stp     x22, x21, [sp, #16]     // 16-byte Folded Spill
        stp     x20, x19, [sp, #32]     // 16-byte Folded Spill
        stp     x29, x30, [sp, #48]     // 16-byte Folded Spill
        add     x29, sp, #48            // =48
.LBB0_1:                                // =>This Inner Loop Header: Depth=1
        scvtf   s0, w8
        fmov    s1, w9
        fmov    s2, w10
        fadd    s0, s0, s1
        fdiv    s0, s0, s2
        str     s0, [x11, x8, lsl #2]
        add     x8, x8, #1              // =1
        cmp     x8, x12
        b.ne    .LBB0_1
// %bb.2:
        adrp    x20, b
        adrp    x21, a
        mov     w19, wzr
        add     x20, x20, :lo12:b
        add     x21, x21, :lo12:a
.LBB0_3:                                // =>This Loop Header: Depth=1
                                        //     Child Loop BB0_4 Depth 2
        mov     w22, #20000
        mov     x23, x21
        mov     x24, x20
.LBB0_4:                                //   Parent Loop BB0_3 Depth=1
                                        // =>  This Inner Loop Header: Depth=2
        ldr     s0, [x23], #4
        fcvt    d0, s0
        bl      sin
        fcvt    s0, d0
        subs    x22, x22, #4            // =4
        str     s0, [x24], #4
        b.ne    .LBB0_4
// %bb.5:                               //   in Loop: Header=BB0_3 Depth=1
        add     w19, w19, #1            // =1
        cmp     w19, #1000              // =1000
        b.ne    .LBB0_3
// %bb.6:
        ldp     x29, x30, [sp, #48]     // 16-byte Folded Reload
        ldp     x20, x19, [sp, #32]     // 16-byte Folded Reload
        ldp     x22, x21, [sp, #16]     // 16-byte Folded Reload
        mov     w0, wzr
        ldp     x24, x23, [sp], #64     // 16-byte Folded Reload
        ret
.Lfunc_end0:
        .size   main, .Lfunc_end0-main
                                        // -- End function
        .type   a,@object               // @a
        .comm   a,20000,4
        .type   b,@object               // @b
        .comm   b,20000,4

        .ident  "clang version 9.0.1 "
        .section        ".note.GNU-stack","",@progbits

@shibatch
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I was wrong in the last comment.
M is set to 100000 in the aarch64 sleef code. This should be 5000.
I ran the programs on my computers, and the aarch64 sleef binary runs at least faster than the scalar binaries.

@shibatch
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sin scalar : 0.366
sin sleef : 0.175
sinh scalar : 0.367
sinh sleef : 0.116

on ODROID-N2

@digikar99
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digikar99 commented Feb 21, 2021 •
edited

Oops, that was a typo in the gist; the code downstream was 5000.

Could you share the output of lscpu or cat /proc/cpuinfo of your aarch64 cpu - the features in particular?

Edit: found the cpu details - not much of an idea what's wrong then! I'll see if this is reproducible with other owners of the device! Thanks for your time!

@digikar99
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Could you also confirm if you used Termux or some other way?

@shibatch
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I don't have a computer that runs Android.

@digikar99
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digikar99 commented Feb 23, 2021 •
edited

Well, okay, even on another device it is slow (this time, ~40x!).

But tried on Debian noroot - and the performance is as expected (sleef is faster).

Also of note is the output of objdump -d lib/libsleef.so > libsleef.txt: it produced a,

  • [aarch64] in Termux, a ~300 MB output;
  • [amd64] on laptop, a ~20MB output
  • [aarch64] in Debian noroot, a ~5MB output

It is true that in Termux, the "usual" root is not at "/" - so, if the build process assumes "/" to be the root, then I may be that some essential files are not being found and hence the difference.

Another observation: grep -n -A50 'Sleef_sinf4_u10' libsleef.txt gets back a lot of ldr and str. While, the file dump in debian noroot contains a good amount of densely packed vector instructions (which should be the case. On Termux, for instance [in case it interests you - or let me know if I should upload the dump to a GDrive or some place else]:

Some lines of `grep -n -A50 'Sleef_sinf4_u10' libsleef.txt` 
6743138:00000000019dce5c <Sleef_sinf4_u10>:
6743139- 19dce5c:	a9be7bfd 	stp	x29, x30, [sp, #-32]!
6743140- 19dce60:	f9000bfc 	str	x28, [sp, #16]
6743141- 19dce64:	910003fd 	mov	x29, sp
6743142- 19dce68:	d1401bff 	sub	sp, sp, #0x6, lsl #12
6743143- 19dce6c:	d11103ff 	sub	sp, sp, #0x440
6743144- 19dce70:	914013e8 	add	x8, sp, #0x4, lsl #12
6743145- 19dce74:	91162108 	add	x8, x8, #0x588
6743146- 19dce78:	3d8103e0 	str	q0, [sp, #1024]
6743147- 19dce7c:	3dc103e0 	ldr	q0, [sp, #1024]
6743148- 19dce80:	3d8107e0 	str	q0, [sp, #1040]
6743149- 19dce84:	3dc107e0 	ldr	q0, [sp, #1040]
6743150- 19dce88:	3d810fe0 	str	q0, [sp, #1072]
6743151- 19dce8c:	3dc10fe0 	ldr	q0, [sp, #1072]
6743152- 19dce90:	4ea0f800 	fabs	v0.4s, v0.4s
6743153- 19dce94:	3d810be0 	str	q0, [sp, #1056]
6743154- 19dce98:	3dc10be0 	ldr	q0, [sp, #1056]
6743155- 19dce9c:	52a85f49 	mov	w9, #0x42fa0000            	// #1123680256
6743156- 19dcea0:	b91cefe9 	str	w9, [sp, #7404]
6743157- 19dcea4:	bd5cefe1 	ldr	s1, [sp, #7404]
6743158- 19dcea8:	bd1d1fe1 	str	s1, [sp, #7452]
6743159- 19dceac:	914007ea 	add	x10, sp, #0x1, lsl #12
6743160- 19dceb0:	9134714a 	add	x10, x10, #0xd1c
6743161- 19dceb4:	4d40c942 	ld1r	{v2.4s}, [x10]
6743162- 19dceb8:	3d873fe2 	str	q2, [sp, #7408]
6743163- 19dcebc:	3dc73fe2 	ldr	q2, [sp, #7408]
6743164- 19dcec0:	3d8743e2 	str	q2, [sp, #7424]
6743165- 19dcec4:	3dc743e2 	ldr	q2, [sp, #7424]
6743166- 19dcec8:	3d874fe0 	str	q0, [sp, #7472]
6743167- 19dcecc:	3d874be2 	str	q2, [sp, #7456]
6743168- 19dced0:	3dc74fe0 	ldr	q0, [sp, #7472]
6743169- 19dced4:	3dc74be2 	ldr	q2, [sp, #7456]
6743170- 19dced8:	3d875be0 	str	q0, [sp, #7520]
6743171- 19dcedc:	3d8757e2 	str	q2, [sp, #7504]
6743172- 19dcee0:	3dc75be0 	ldr	q0, [sp, #7520]
6743173- 19dcee4:	3dc757e2 	ldr	q2, [sp, #7504]
6743174- 19dcee8:	6ea0e440 	fcmgt	v0.4s, v2.4s, v0.4s
6743175- 19dceec:	3d8753e0 	str	q0, [sp, #7488]
6743176- 19dcef0:	3dc753e0 	ldr	q0, [sp, #7488]
6743177- 19dcef4:	3d87ebe0 	str	q0, [sp, #8096]
6743178- 19dcef8:	3dc7ebe0 	ldr	q0, [sp, #8096]
6743179- 19dcefc:	3d87f3e0 	str	q0, [sp, #8128]
6743180- 19dcf00:	3dc7f3e0 	ldr	q0, [sp, #8128]
6743181- 19dcf04:	fd0fdfe0 	str	d0, [sp, #8120]
6743182- 19dcf08:	fd4fdfe0 	ldr	d0, [sp, #8120]
6743183- 19dcf0c:	3dc7ebe2 	ldr	q2, [sp, #8096]
6743184- 19dcf10:	3d8807e2 	str	q2, [sp, #8208]
6743185- 19dcf14:	3dc807e2 	ldr	q2, [sp, #8208]
6743186- 19dcf18:	6e024042 	ext	v2.16b, v2.16b, v2.16b, #8
6743187- 19dcf1c:	fd1007e2 	str	d2, [sp, #8200]
6743188- 19dcf20:	fd5007e2 	ldr	d2, [sp, #8200]
--
\```

</details>

@shibatch
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I have no idea, but looks like a similar problem to the following one.

android/ndk#82

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@shibatch @digikar99