Some built-in fucntions are not supported for PPC64 before POWER8 such as Apple G5

[OctopusET]

Describe the bug
I tried to build simdjson on my Apple G5 (PowerPC 970), and I found some built-in functions are not supported on this machine even some VSX functions are supported.

simdjson/include/simdjson/ppc64/simd.h

Line 111 in 7712ecf

result = ((__vector unsigned long long)vec_vbpermq((__m128i)this->value,

This line isn't working even add '-mvsx' because it also requires '-mcpu=power8'
Here's detailed list of which functions are supported:

• https://gcc.gnu.org/onlinedocs/gcc-7.2.0/gcc/PowerPC-AltiVec_002fVSX-Built-in-Functions.html
• https://gcc.gnu.org/onlinedocs/gcc/PowerPC-AltiVec-Built-in-Functions-Available-on-ISA-2_002e06.html

To Reproduce

1. Get PPC64 machine before POWER8 era (such as Apple G5)
2. Try build it
3. Boom

Build log
https://pastebin.com/y8rzmmxW

simjson release
5.11.0

Configuration (please complete the following information if relevant)

• OS: Gentoo
• Compiler* gcc version: 14.2.1 20241221 (Gentoo 14.2.1_p20241221 p7)
• Optimization setting: -O2 -pipe -mcpu=970 -mtune=970 -maltivec -mabi=altivec

Indicate whether you are willing or able to provide a bug fix as a pull request
I'm investigating now, silx-kit/hdf5plugin#307 (comment)
This fix is hint but didn't work.

See also
https://stackoverflow.com/questions/47771721/what-is-the-availability-of-vector-long-long

[OctopusET]

I'm investigating now, silx-kit/hdf5plugin#307 (comment)
This fix is hint but didn't work.

I think this fix will work, because on gentoo they enable SIMDJSON_IMPLEMENTATION_PPC64 by force.

[OctopusET]

But eventually it could be possible to write codes for these devices by removing unsupported functions.

[lemire]

We currently support 64-bit POWER8 and POWER9 with VSX and ALTIVEC extensions.

[lemire]

on gentoo they enable SIMDJSON_IMPLEMENTATION_PPC64 by force.

Please report the issue on gentoo.

[lemire]

Closed. It appears that the reporter is using a system that forces SIMDJSON_IMPLEMENTATION_PPC64 on a system where it is not appropriate.

[OctopusET]

Ops sorry I thought when it's checking VSX support it's equivalent to AVTIVEC support.
I tried buliding simdjson from the source and it's working well. Thanks.