Chris, is that the case for MacOS 10.8 as well?
> On 2021-05-04-T, at 14:24, Christopher Jones <[email protected]> wrote: > > Thats very out out date. The as provided by the cctools port either uses a > new LLVM build, or just wraps the Xcode tools on the most recent systems. It > supports AVX just fine. > >> On 4 May 2021, at 7:17 pm, Christopher Nielsen <[email protected] >> <mailto:[email protected]>> wrote: >> >> Based on the following ticket, it sounds as if GCC is utilizing Apple’s >> assembler by default? >> >> cctools as does not support AVX, consider using llvm: >> https://trac.macports.org/ticket/37846 >> <https://trac.macports.org/ticket/37846> >> >> The suggested fix - albeit from 3 years ago - requires manually selecting >> clang, via ‘port select’. Is that still accurate? Are there any other clean >> ways to fix this, apart from disabling use of AVX instructions? >> >>> On 2021-05-04-T, at 12:45, Christopher Nielsen <[email protected] >>> <mailto:[email protected]>> wrote: >>> >>> I’m currently reviewing the build logs for openmpi-* subports, which are >>> failing to build for older MacOS releases. >>> >>> And it looks like the issue relates to the use of the various AVX* >>> instruction sets: >>> >>> CCLD liblocal_ops_avx2.la <http://liblocal_ops_avx2.la/> >>> <stdin>:1015:20: error: invalid operand for instruction >>> vmovdqu64 (%rdi), %ymm0 >>> ^~~~~ >>> <stdin>:1019:12: error: invalid operand for instruction >>> vmovdqu64 %ymm0, -32(%rsi) >>> ^~~~~ >>> <stdin>:1127:20: error: invalid operand for instruction >>> vmovdqu64 (%rdi), %ymm0 >>> ^~~~~ >>> <stdin>:1131:12: error: invalid operand for instruction >>> vmovdqu64 %ymm0, -32(%rsi) >>> ^~~~~ >>> […etc…] >>> >>> We can fix the problem by disabling use of those instructions, via a >>> configure flag. The simplest approach would be to disable them >>> across-the-board, albeit with a slight performance penalty. Or we can add >>> conditional logic to disable them for those older releases. >>> >>> There’s something curious though: These instructions are supported for GCC >>> 5 and 6, on MacOS 10.8. But GCC releases from 7 on, don’t seem to. (All GCC >>> releases are working for later MacOS releases, though.) >>> >>> So… do our GCC 7+ releases for MacOS 10.8 and earlier, not include AVX* >>> support? If not, would it be feasible to patch them?
