David Sterba 03f41ac508 btrfs-progs: detect PCLMUL CPU support for accelerated crc32c ... The accelerated crc32c needs to check for two CPU features, the crc32c instructions is in SSE 4.2 and 'pclmulqdq' is a separate. There's still old hardware used that does not have the PCLMUL instructions. Detect it and make it the condition. The pclmul is not supported on old compilers so also add a configure-time detection and leave the SSE 4.2 only implementation as the accelerated one if possible. Issue: #676 Signed-off-by: David Sterba <dsterba@suse.com>		2023-09-13 00:38:50 +02:00
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ax_check_compile_flag.m4
ax_check_define.m4
ax_gcc_builtin.m4	btrfs-progs: detect PCLMUL CPU support for accelerated crc32c	2023-09-13 00:38:50 +02:00