https://bugs.llvm.org/show_bug.cgi?id=48336
Bug ID: 48336
Summary: [X86] What AVX512 cpus should prefer 512-bit vectors?
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: llvm-...@redking.me.uk
CC: craig.top...@gmail.com, llvm-bugs@lists.llvm.org,
llvm-...@redking.me.uk, pengfei.w...@intel.com,
pe...@cordes.ca, spatel+l...@rotateright.com
All avx512 capable Skylake CPUs and later currently prefer 256-bit vs 512-bit
vector generation - only the Knights Landing family always prefers 512-bit
(very different arch, no VLX support etc.).
AFAICT many of the frequency throttling issues with 512-bit ops were already
addressed by/after Icelake - so do we need to alter the tuning for later cpus
to let them vectorize to the full 512-bit alu width?
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