mirror of
git://git.sv.gnu.org/coreutils
synced 2026-05-06 07:06:38 -04:00
Collin Funk
6a3dde5dd2
Here is an example of the performance improvement:
$ yes abcdefghijklmnopqrstuvwxyz | head -n 100000000 > input
$ time ./src/wc-prev -l < input
100000000
real 0m0.793s
user 0m0.630s
sys 0m0.162s
$ time ./src/wc -l < input
100000000
real 0m0.230s
user 0m0.065s
sys 0m0.164s
* NEWS: Mention the performance improvement.
* gnulib: Update to the latest commit.
* configure.ac: Check the the necessary intrinsics and functions.
* src/local.mk (noinst_LIBRARIES) [USE_NEON_WC_LINECOUNT]: Add
src/libwc_neon.a.
(src_libwc_neon_a_SOURCES, wc_neon_ldadd, src_libwc_neon_a_CFLAGS)
[USE_NEON_WC_LINECOUNT]: New variables.
(src_wc_LDADD) [USE_NEON_WC_LINECOUNT]: Add $(wc_neon_ldadd).
* src/wc.c [USE_NEON_WC_LINECOUNT]: Include sys/auxv.h and asm/hwcap.h.
(neon_supported) [USE_NEON_WC_LINECOUNT]: New function.
(wc_lines) [USE_NEON_WC_LINECOUNT]: Use neon_supported and
wc_lines_neon.
* src/wc.h (wc_lines_neon): Add declaration.
* src/wc_neon.c: New file.
* doc/coreutils.texi (Hardware Acceleration): Document the "-ASIMD"
hwcap and the variable used in ./configure to override detection of Neon
instructions.
* tests/wc/wc-cpu.sh: Also add "-ASIMD" to disable the use of Neon
instructions.