Guillaume Gomez
7d6c99dd06
Rollup merge of #121088 - nikic:evex512, r=Amanieu
...
Implicitly enable evex512 if avx512 is enabled
LLVM 18 requires the evex512 feature to allow use of zmm registers. LLVM automatically sets it when using a generic CPU, but not when `-C target-cpu` is specified. This will result either in backend legalization crashes, or code unexpectedly using ymm instead of zmm registers.
For now, make sure that `avx512*` features imply `evex512`. Long term we'll probably have to deal with the AVX10 mess somehow.
Fixes https://github.com/rust-lang/rust/issues/121081 .
r? `@Amanieu`
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