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| author | Conrad Meyer <cem@FreeBSD.org> | 2017-01-31 03:26:32 +0000 |
|---|---|---|
| committer | Conrad Meyer <cem@FreeBSD.org> | 2017-01-31 03:26:32 +0000 |
| commit | 6be2ff7d3ec49fec22db8a092faa89a8d7f9bd44 (patch) | |
| tree | 8f08ceee7a488096ed31e1ebca59bf1cc9fc8260 /sys/conf/files.i386 | |
| parent | d9dbd70bca767f5f8604840f72d5904408e62064 (diff) | |
| download | src-6be2ff7d3ec49fec22db8a092faa89a8d7f9bd44.tar.gz src-6be2ff7d3ec49fec22db8a092faa89a8d7f9bd44.zip | |
calculate_crc32c: Add SSE4.2 implementation on x86
Derived from an implementation by Mark Adler.
The fast loop performs three simultaneous CRCs over subsets of the data
before composing them. This takes advantage of certain properties of
the CRC32 implementation in Intel hardware. (The CRC instruction takes 1
cycle but has 2-3 cycles of latency.)
The CRC32 instruction does not manipulate FPU state.
i386 does not have the crc32q instruction, so avoid it there. Otherwise
the implementation is identical to amd64.
Add basic userland tests to verify correctness on a variety of inputs.
PR: 216467
Reported by: Ben RUBSON <ben.rubson at gmail.com>
Reviewed by: kib@, markj@ (earlier version)
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D9342
Notes
Notes:
svn path=/head/; revision=313006
Diffstat (limited to 'sys/conf/files.i386')
| -rw-r--r-- | sys/conf/files.i386 | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/sys/conf/files.i386 b/sys/conf/files.i386 index c0b75d7e1894..467218215f9e 100644 --- a/sys/conf/files.i386 +++ b/sys/conf/files.i386 @@ -554,6 +554,11 @@ kern/kern_clocksource.c standard kern/imgact_aout.c optional compat_aout kern/imgact_gzip.c optional gzip kern/subr_sfbuf.c standard +crc32_sse42.o standard \ + dependency "$S/libkern/x86/crc32_sse42.c" \ + compile-with "${CC} -c ${CFLAGS:N-nostdinc} ${WERROR} ${PROF} -msse4 ${.IMPSRC}" \ + no-implicit-rule \ + clean "crc32_sse42.o" libkern/divdi3.c standard libkern/ffsll.c standard libkern/flsll.c standard |