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add a note about AVX-512 flags

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Jack O'Connor 2020-01-27 13:06:56 -05:00
parent 444a338b45
commit dec0c49576
1 changed files with 4 additions and 0 deletions
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@ -75,6 +75,10 @@ gcc -shared -O3 blake3.c blake3_dispatch.c blake3_portable.c \
blake3_avx2.o blake3_avx512.o blake3_sse41.o -o libblake3.so blake3_avx2.o blake3_avx512.o blake3_sse41.o -o libblake3.so
``` ```
Note that building `blake3_avx512.c` requires both `-mavx512f` and
`-mavx512vl` under GCC and Clang, as shown above. Under MSVC, the single
`/arch:AVX512` flag is sufficient.
If you want to omit SIMD code on x86, you need to explicitly disable If you want to omit SIMD code on x86, you need to explicitly disable
each instruction set. Here's an example of building a shared library on each instruction set. Here's an example of building a shared library on
Linux with no SIMD support: Linux with no SIMD support: