immintrin.h not found during compile

[rontant]

When trying to compile for my Rock64, a Raspberry Pi like SBC, I got an error here:

root@rock64:~/Winter# make -j4 g++ -c -DNDEBUG -O3 -flto -g3 -Wall -Wno-sign-compare -march=native -std=c++11 -Isrc -Isrc/general -Isrc/learning src/general/bookkeeping.cc -o src/general/bookkeeping.o g++ -c -DNDEBUG -O3 -flto -g3 -Wall -Wno-sign-compare -march=native -std=c++11 -Isrc -Isrc/general -Isrc/learning src/general/wdl_score.cc -o src/general/wdl_score.o g++ -c -DNDEBUG -O3 -flto -g3 -Wall -Wno-sign-compare -march=native -std=c++11 -Isrc -Isrc/general -Isrc/learning src/general/debug.cc -o src/general/debug.o g++ -c -DNDEBUG -O3 -flto -g3 -Wall -Wno-sign-compare -march=native -std=c++11 -Isrc -Isrc/general -Isrc/learning src/general/parse.cc -o src/general/parse.o g++ -c -DNDEBUG -O3 -flto -g3 -Wall -Wno-sign-compare -march=native -std=c++11 -Isrc -Isrc/general -Isrc/learning src/general/magic.cc -o src/general/magic.o g++ -c -DNDEBUG -O3 -flto -g3 -Wall -Wno-sign-compare -march=native -std=c++11 -Isrc -Isrc/general -Isrc/learning src/learning/machine_learning.cc -o src/learning/machine_learning.o src/general/magic.cc:30:10: fatal error: immintrin.h: No such file or directory

include

[rosenthj]

I am reasonably confident that is only needed for the pext instruction. Assuming that I am right and the Rock64 does not support the BMI2 instruction set, the easiest workaround is to simply remove line 30 in Winter/src/general/magic.cc

If this does not suffice you can further replace -march=native with -m64. This may have some effect on performance.

Could you try that and get back to me? If it works I will patch Winter to avoid issues like this for other users in the future.

[rontant]

Thank you very much for your prompt response.

Simply removing line 30 as per your suggestion works. We can keep -march=native option.

You are right that rock64 doesn't support BMI2 set.

root@rock64:~/Winter# lscpu
Architecture:        aarch64
Byte Order:          Little Endian
CPU(s):              4
On-line CPU(s) list: 0-3
Thread(s) per core:  1
Core(s) per socket:  4
Socket(s):           1
Vendor ID:           ARM
Model:               4
Model name:          Cortex-A53
Stepping:            r0p4
CPU max MHz:         1296.0000
CPU min MHz:         408.0000
BogoMIPS:            48.00
Flags:               fp asimd evtstrm aes pmull sha1 sha2 crc32

root@rock64:~/Winter# file Winter
Winter: ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-aarch64.so.1, for GNU/Linux 3.7.0, BuildID[sha1]=75e4cd43bbcd91a9a975d55950f4831a724165ba, not stripped

To make sure everything works fine, I have this compiled version of Winter pitted against Lc0 using my own Javascript/PHP GUI. Interestingly, Winter managed to check mate Lc0 in 47 moves.

Again, thank you very much. Just let me know if you need any info regarding my rock64.

I am pasting the moves below just in case you are interested:

[ white: "Winter 0.84"] [ black: "Lc0 I-forget-the-network-file-name"]

1. e2e4 c7c5
2. b1c3 b8c6
3. g1f3 e7e5
4. f1c4 f8e7
5. e1g1 g8f6
6. d2d3 e8g8
7. h2h3 d7d6
8. c1g5 h7h6
9. g5f6 e7f6
10. c3d5 g8h8
11. c2c3 c8e6
12. d5e3 d8d7
13. a2a3 a8c8
14. c4e6 f7e6
15. b2b4 b7b6
16. d1e2 c6e7
17. f1c1 e7g6
18. g2g3 f6d8
19. h3h4 d7f7
20. g1g2 d8h4
21. f3h4 g6h4
22. g3h4 f7e7
23. b4c5 c8c5
24. e2h5 f8f4
25. c1c2 h8h7
26. a1h1 c5a5
27. e3c4 a5c5
28. h1h3 g7g6
29. h5d1 f4h4
30. h3h4 e7h4
31. d1f3 h4e7
32. a3a4 c5c7
33. f3g3 h7g7
34. c2c1 c7c6
35. c1h1 e7f6
36. g3g4 c6c7
37. c4d6 c7e7
38. g4g3 g7h7
39. d6c4 h6h5
40. c4e5 e7e8
41. h1h4 e8g8
42. h4f4 f6e5
43. f4f7 h7h6
44. g3e5 b6b5
45. e5f4 g6g5
46. f4f6 g8g6
47. f6h8 a1a1

[rosenthj]

Thanks for the bug report and game. I have made an update so you shouldn't have to change any source code when you compile Winter in the future.

I am closing this issue now!