Searched hist:a8e3f99ec190ee5c11413878b7fd75578e542808 (Results 1 – 7 of 7) sorted by relevance
| /freebsd/sys/conf/ |
| H A D | files.riscv | diff a8e3f99ec190ee5c11413878b7fd75578e542808 Thu Sep 27 16:05:44 CEST 2018 Mateusz Guzik <mjg@FreeBSD.org> amd64: implement memcmp in assembly
Both the in-kernel C variant and libc asm variant have very poor performance.
The former compiles to a single byte comparison loop, which breaks down even
for small sizes. The latter uses rep cmpsq/b which turn out to have very poor
throughput and are slower than a hand-coded 32-byte comparison loop.
Depending on size this is about 3-4 times faster than the current routines.
Reviewed by: kib
Approved by: re (gjb)
Differential Revision: https://reviews.freebsd.org/D17328
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| H A D | files.arm | diff a8e3f99ec190ee5c11413878b7fd75578e542808 Thu Sep 27 16:05:44 CEST 2018 Mateusz Guzik <mjg@FreeBSD.org> amd64: implement memcmp in assembly
Both the in-kernel C variant and libc asm variant have very poor performance.
The former compiles to a single byte comparison loop, which breaks down even
for small sizes. The latter uses rep cmpsq/b which turn out to have very poor
throughput and are slower than a hand-coded 32-byte comparison loop.
Depending on size this is about 3-4 times faster than the current routines.
Reviewed by: kib
Approved by: re (gjb)
Differential Revision: https://reviews.freebsd.org/D17328
|
| H A D | files.arm64 | diff a8e3f99ec190ee5c11413878b7fd75578e542808 Thu Sep 27 16:05:44 CEST 2018 Mateusz Guzik <mjg@FreeBSD.org> amd64: implement memcmp in assembly
Both the in-kernel C variant and libc asm variant have very poor performance.
The former compiles to a single byte comparison loop, which breaks down even
for small sizes. The latter uses rep cmpsq/b which turn out to have very poor
throughput and are slower than a hand-coded 32-byte comparison loop.
Depending on size this is about 3-4 times faster than the current routines.
Reviewed by: kib
Approved by: re (gjb)
Differential Revision: https://reviews.freebsd.org/D17328
|
| H A D | files.powerpc | diff a8e3f99ec190ee5c11413878b7fd75578e542808 Thu Sep 27 16:05:44 CEST 2018 Mateusz Guzik <mjg@FreeBSD.org> amd64: implement memcmp in assembly
Both the in-kernel C variant and libc asm variant have very poor performance.
The former compiles to a single byte comparison loop, which breaks down even
for small sizes. The latter uses rep cmpsq/b which turn out to have very poor
throughput and are slower than a hand-coded 32-byte comparison loop.
Depending on size this is about 3-4 times faster than the current routines.
Reviewed by: kib
Approved by: re (gjb)
Differential Revision: https://reviews.freebsd.org/D17328
|
| H A D | files.i386 | diff a8e3f99ec190ee5c11413878b7fd75578e542808 Thu Sep 27 16:05:44 CEST 2018 Mateusz Guzik <mjg@FreeBSD.org> amd64: implement memcmp in assembly
Both the in-kernel C variant and libc asm variant have very poor performance.
The former compiles to a single byte comparison loop, which breaks down even
for small sizes. The latter uses rep cmpsq/b which turn out to have very poor
throughput and are slower than a hand-coded 32-byte comparison loop.
Depending on size this is about 3-4 times faster than the current routines.
Reviewed by: kib
Approved by: re (gjb)
Differential Revision: https://reviews.freebsd.org/D17328
|
| H A D | files | diff a8e3f99ec190ee5c11413878b7fd75578e542808 Thu Sep 27 16:05:44 CEST 2018 Mateusz Guzik <mjg@FreeBSD.org> amd64: implement memcmp in assembly
Both the in-kernel C variant and libc asm variant have very poor performance.
The former compiles to a single byte comparison loop, which breaks down even
for small sizes. The latter uses rep cmpsq/b which turn out to have very poor
throughput and are slower than a hand-coded 32-byte comparison loop.
Depending on size this is about 3-4 times faster than the current routines.
Reviewed by: kib
Approved by: re (gjb)
Differential Revision: https://reviews.freebsd.org/D17328
|
| /freebsd/sys/amd64/amd64/ |
| H A D | support.S | diff a8e3f99ec190ee5c11413878b7fd75578e542808 Thu Sep 27 16:05:44 CEST 2018 Mateusz Guzik <mjg@FreeBSD.org> amd64: implement memcmp in assembly
Both the in-kernel C variant and libc asm variant have very poor performance.
The former compiles to a single byte comparison loop, which breaks down even
for small sizes. The latter uses rep cmpsq/b which turn out to have very poor
throughput and are slower than a hand-coded 32-byte comparison loop.
Depending on size this is about 3-4 times faster than the current routines.
Reviewed by: kib
Approved by: re (gjb)
Differential Revision: https://reviews.freebsd.org/D17328
|