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zstd: disable intrinsics

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Disable the aarch64 NEON SIMD intrinsics for kernel builds.  Safely
using them in the kernel context requires saving/restoring the FPU
registers which is not currently done.

Additionally, remove the aarch64 optimized PREFETCH_L1 and PREFETCH_L2
instruction.  Rely on the more portable compiler built ins.

This lets us remove the problematic workaround in the aarch64_compat.h
header which undefines the __aarch64__ macro.

Reviewed-by: Rob Norris <robn@despairlabs.com>
Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #17904
Closes #17852
This commit is contained in:
Brian Behlendorf
2025-11-07 10:01:12 -08:00
parent 015729a11b
commit 84dd55510b
5 changed files with 10 additions and 67 deletions
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module/Makefile.bsd
-24
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@@ -521,30 +521,6 @@ CFLAGS.zstd_ldm.c= -U__BMI__ -fno-tree-vectorize ${NO_WBITWISE_INSTEAD_OF_LOGICA
CFLAGS.zstd_opt.c= -U__BMI__ -fno-tree-vectorize ${NO_WBITWISE_INSTEAD_OF_LOGICAL}
.if ${MACHINE_ARCH} == "aarch64"
__ZFS_ZSTD_AARCH64_FLAGS= -include ${SRCDIR}/zstd/include/aarch64_compat.h
CFLAGS.zstd.c+= ${__ZFS_ZSTD_AARCH64_FLAGS}
CFLAGS.entropy_common.c+= ${__ZFS_ZSTD_AARCH64_FLAGS}
CFLAGS.error_private.c+= ${__ZFS_ZSTD_AARCH64_FLAGS}
CFLAGS.fse_compress.c+= ${__ZFS_ZSTD_AARCH64_FLAGS}
CFLAGS.fse_decompress.c+= ${__ZFS_ZSTD_AARCH64_FLAGS}
CFLAGS.hist.c+= ${__ZFS_ZSTD_AARCH64_FLAGS}
CFLAGS.huf_compress.c+= ${__ZFS_ZSTD_AARCH64_FLAGS}
CFLAGS.huf_decompress.c+= ${__ZFS_ZSTD_AARCH64_FLAGS}
CFLAGS.pool.c+= ${__ZFS_ZSTD_AARCH64_FLAGS}
CFLAGS.xxhash.c+= ${__ZFS_ZSTD_AARCH64_FLAGS}
CFLAGS.zstd_common.c+= ${__ZFS_ZSTD_AARCH64_FLAGS}
CFLAGS.zstd_compress.c+= ${__ZFS_ZSTD_AARCH64_FLAGS}
CFLAGS.zstd_compress_literals.c+= ${__ZFS_ZSTD_AARCH64_FLAGS}
CFLAGS.zstd_compress_sequences.c+= ${__ZFS_ZSTD_AARCH64_FLAGS}
CFLAGS.zstd_compress_superblock.c+= ${__ZFS_ZSTD_AARCH64_FLAGS}
CFLAGS.zstd_ddict.c+= ${__ZFS_ZSTD_AARCH64_FLAGS}
CFLAGS.zstd_decompress.c+= ${__ZFS_ZSTD_AARCH64_FLAGS}
CFLAGS.zstd_decompress_block.c+= ${__ZFS_ZSTD_AARCH64_FLAGS}
CFLAGS.zstd_double_fast.c+= ${__ZFS_ZSTD_AARCH64_FLAGS}
CFLAGS.zstd_fast.c+= ${__ZFS_ZSTD_AARCH64_FLAGS}
CFLAGS.zstd_lazy.c+= ${__ZFS_ZSTD_AARCH64_FLAGS}
CFLAGS.zstd_ldm.c+= ${__ZFS_ZSTD_AARCH64_FLAGS}
CFLAGS.zstd_opt.c+= ${__ZFS_ZSTD_AARCH64_FLAGS}
sha256-armv8.o: sha256-armv8.S
${CC} -c ${CFLAGS:N-mgeneral-regs-only} ${WERROR} ${.IMPSRC} \