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Owen Anderson 735db78b3d
wc: specialize scanning loop on settings. (#3708) 
* wc: specialize scanning loop on settings.

The primary computational loop in wc (iterating over all the
characters and computing word lengths, etc) is configured by a
number of boolean options that control the text-scanning behavior.
If we monomorphize the code loop for each possible combination of
scanning configurations, the rustc is able to generate better code
for each instantiation, at the least by removing the conditional
checks on each iteration, and possibly by allowing things like
vectorization.

On my computer (aarch64/macos), I am seeing at least a 5% performance
improvement in release builds on all wc flag configurations
(other than those that were already specialized) against
odyssey1024.txt, with wc -l showing the greatest improvement at 15%.

* Reduce the size of the wc dispatch table by half.

By extracting the handling of hand-written fast-paths to the
same dispatch as the automatic specializations, we can avoid
needing to pass `show_bytes` as a const generic to
`word_count_from_reader_specialized`. Eliminating this parameter
halves the number of arms in the dispatch.
2022-07-18 12:16:52 +02:00
..
test_arch.rs Fix some tests to not use CmdResult fields 2021-04-10 23:30:50 +03:00
test_base32.rs all: use array intoiterator 2022-04-05 10:39:31 +02:00
test_base64.rs all: use array intoiterator 2022-04-05 10:39:31 +02:00
test_basename.rs all: use array intoiterator 2022-04-05 10:39:31 +02:00
test_basenc.rs basenc: add utility 2021-08-06 00:07:19 +02:00
test_cat.rs get android builds to compile and pass tests 2022-04-20 08:44:49 +02:00
test_chcon.rs all: use array intoiterator 2022-04-05 10:39:31 +02:00
test_chgrp.rs get android builds to compile and pass tests 2022-04-20 08:44:49 +02:00
test_chmod.rs Replace lazy_static with once_cell 2022-07-12 14:08:30 +01:00
test_chown.rs fixup! chown: allow setting arbitrary numeric user ID 2022-05-12 08:41:17 +02:00
test_chroot.rs get android builds to compile and pass tests 2022-04-20 08:44:49 +02:00
test_cksum.rs cksum: accept directories as empty files 2021-12-26 21:50:13 +01:00
test_comm.rs comm: enable "output_delimiter" test 2022-07-07 15:22:43 +02:00
test_cp.rs tests/cp: add test for cp-parents.sh 2022-07-17 23:04:09 +03:00
test_csplit.rs tests ~ refactor/polish spelling (comments, names, and exceptions) 2021-05-31 08:23:57 -05:00
test_cut.rs cut: fix argument parsing for the delimiter 2022-06-09 22:14:43 +02:00
test_date.rs get android builds to compile and pass tests 2022-04-20 08:44:49 +02:00
test_dd.rs dd: only print concise byte counts if large enough 2022-06-11 23:16:16 -04:00
test_df.rs Adds a test for sync. 2022-06-05 09:43:59 +02:00
test_dir.rs dir, vdir: fix incorrect regex in tests 2022-05-01 13:48:51 +02:00
test_dircolors.rs dircolors: escape "'" and ":" 2022-06-15 15:22:14 +02:00
test_dirname.rs tr/dirname: fix clap short_alias 2021-04-30 20:19:43 +02:00
test_du.rs uucore: add InvalidSuffix to ParseSizeError 2022-05-17 15:37:49 +02:00
test_echo.rs Allow echo with escapes to work with \0 2022-01-30 17:24:29 -05:00
test_env.rs all: use array intoiterator 2022-04-05 10:39:31 +02:00
test_expand.rs expand: add support for "--tabs" shortcuts 2022-06-10 13:55:27 +02:00
test_expr.rs expr: Use chars().count() as we can have some multibytes chars 2022-02-13 14:19:25 +01:00
test_factor.rs update to sha 0.10.0 (#3110) 2022-02-12 18:12:02 +01:00
test_false.rs false,true: Implement custom help, version 2022-02-01 14:29:26 +01:00
test_fmt.rs tests: delete 'error:' prefix from the tests 2021-05-26 02:45:53 +03:00
test_fold.rs refactor ~ cargo make format 2021-05-31 08:23:58 -05:00
test_groups.rs tests: fix tests for CICD environment 2021-07-08 11:17:18 +02:00
test_hashsum.rs hashsum: add --no-names option from official b3sum tool (#3361) 2022-04-06 09:09:37 +02:00
test_head.rs head, tail: include presume-input-pipe parameter 2022-04-01 11:55:33 +02:00
test_hostid.rs Refactored tests for more utilities 2021-04-18 02:32:43 +03:00
test_hostname.rs silent the failed tests for now on freebsd 2021-08-24 09:32:27 +02:00
test_id.rs get android builds to compile and pass tests 2022-04-20 08:44:49 +02:00
test_install.rs Merge pull request #3663 from niyaznigmatullin/fix_install_C_test 2022-06-23 17:09:02 +02:00
test_join.rs join: flush stdout before final error message 2022-02-07 22:32:02 -05:00
test_kill.rs use 'Self' and derive 'Default' where possible 2022-01-30 15:08:26 +01:00
test_link.rs get android builds to compile and pass tests 2022-04-20 08:44:49 +02:00
test_ln.rs tests/ln: add test for same file 2022-07-18 08:17:37 +03:00
test_logname.rs tests: delete 'error:' prefix from the tests 2021-05-26 02:45:53 +03:00
test_ls.rs Merge pull request #3704 from Sciencentistguy/once_cell 2022-07-13 16:15:47 +02:00
test_mkdir.rs Fix clippy 2022-04-02 09:54:11 +02:00
test_mkfifo.rs tests: delete 'error:' prefix from the tests 2021-05-26 02:45:53 +03:00
test_mknod.rs fix clippy errors related to clap upgrade from 3.0.10 to 3.1.6 2022-03-17 22:46:56 +01:00
test_mktemp.rs mktemp: respect POSIXLY_CORRECT env var when parsing args 2022-06-09 20:51:51 +08:00
test_more.rs tests: use CmdResult::usage_error 2021-11-09 17:37:05 -03:00
test_mv.rs mv: allow a single source with --target-directory 2022-05-14 03:00:29 +00:00
test_nice.rs nice: set exit code for clap errors to 125 2022-05-04 21:32:14 +02:00
test_nl.rs all: use array intoiterator 2022-04-05 10:39:31 +02:00
test_nohup.rs get android builds to compile and pass tests 2022-04-20 08:44:49 +02:00
test_nproc.rs nproc: make tests/misc/nproc-override.sh pass by implementing OMP_NUM_THREADS=X,Y,Z (#3296) 2022-03-23 12:12:54 +01:00
test_numfmt.rs numfmt: reject suffix if unit is "none" 2022-07-13 10:47:59 +02:00
test_od.rs uucore: add InvalidSuffix to ParseSizeError 2022-05-17 15:37:49 +02:00
test_paste.rs paste: implement "-z" flag 2022-06-22 09:30:00 +02:00
test_pathchk.rs tests ~ fix cargo clippy complaint (clippy::needless_borrow) 2021-06-06 19:28:25 -05:00
test_pinky.rs fix null pointer derefs 2022-04-20 08:44:49 +02:00
test_pr.rs all: use array intoiterator 2022-04-05 10:39:31 +02:00
test_printenv.rs use assert_eq instead of x == y. Better output in case of error 2022-03-23 10:41:31 +01:00
test_printf.rs printf: Default left-justify integer conversion to 1 width 2022-05-01 20:00:09 +02:00
test_ptx.rs tests/ptx: added breakfile option tests 2022-04-29 10:15:06 +02:00
test_pwd.rs tests/mkdir: reduced tested permission combinations 2022-03-31 15:50:52 +09:00
test_readlink.rs readlink: symlink loop handling (#3717) 2022-07-14 22:32:55 +02:00
test_realpath.rs Realpath relative options (#3710) 2022-07-12 08:29:20 +02:00
test_relpath.rs fix Rust 1.59 clippy lints 2022-02-25 09:39:48 +01:00
test_rm.rs tests/rm: add test for issue #3722 2022-07-17 23:34:04 +03:00
test_rmdir.rs rmdir: match GNU 2021-08-28 02:26:01 +02:00
test_runcon.rs all: use array intoiterator 2022-04-05 10:39:31 +02:00
test_seq.rs seq: Allow option to receive immediate arguments 2022-02-06 09:45:38 -06:00
test_shred.rs shred, stat, tail: Remove direct usage of CmdResult fields in test 2021-04-17 18:50:41 +03:00
test_shuf.rs fix lint errors attempt 2 2022-03-28 11:36:50 -04:00
test_sleep.rs uucore: error on negative interval in parse_time 2022-03-21 21:11:31 -04:00
test_sort.rs uucore: add InvalidSuffix to ParseSizeError 2022-05-17 15:37:49 +02:00
test_split.rs split: avoid writing final empty chunk with -C 2022-03-20 09:30:58 -04:00
test_stat.rs test_stat: expand scope for stdin tests 2022-05-12 22:49:34 +02:00
test_stdbuf.rs Improve coverage / error messages from parse_size PR 2022-02-22 22:09:45 +01:00
test_sum.rs Update message quoting and filename printing 2021-09-07 19:49:01 +02:00
test_sync.rs test: fix tests 2021-05-26 03:07:49 +03:00
test_tac.rs tac: add support for --regex option to tac 2021-09-11 22:54:55 -04:00
test_tail.rs tail: reduce CPU load for polling (#3618) 2022-06-21 22:21:19 +02:00
test_tee.rs Implement tee -p and --output-error 2022-07-07 15:23:50 +02:00
test_test.rs test: fix wsl executable permission 2022-01-31 00:22:21 +01:00
test_timeout.rs all: use array intoiterator 2022-04-05 10:39:31 +02:00
test_touch.rs also support for tests/touch/relative.sh 2022-05-08 21:52:12 +02:00
test_tr.rs tr: fix octal interpretation of repeat count string (#3178) 2022-02-25 12:11:53 +01:00
test_true.rs false,true: Implement custom help, version 2022-02-01 14:29:26 +01:00
test_truncate.rs Remove impractical test creating a file too large 2022-02-22 14:23:46 +01:00
test_tsort.rs refactor tests (#1982) 2021-04-23 02:28:46 +02:00
test_tty.rs tty: should not return 2 when --help is used 2022-04-04 22:55:36 +02:00
test_uname.rs get android builds to compile and pass tests 2022-04-20 08:44:49 +02:00
test_unexpand.rs unexpand: handle too large "tabs" arguments 2022-06-22 09:30:11 +02:00
test_uniq.rs uniq: set default missing value for args 2022-06-30 11:52:46 +02:00
test_unlink.rs unlink: Simplify, remove unsafe, move to core 2021-09-10 21:50:38 +02:00
test_uptime.rs tests ~ refactor/polish spelling (comments, names, and exceptions) 2021-05-31 08:23:57 -05:00
test_users.rs users and who: ignore failing tests for now 2022-03-07 12:32:07 -05:00
test_vdir.rs dir, vdir: fix incorrect regex in tests 2022-05-01 13:48:51 +02:00
test_wc.rs wc: specialize scanning loop on settings. (#3708) 2022-07-18 12:16:52 +02:00
test_who.rs all: use array intoiterator 2022-04-05 10:39:31 +02:00
test_whoami.rs whoami: Run tests on Windows 2021-09-14 14:13:58 +02:00
test_yes.rs Do not trap pipe errors in yes 2022-07-07 15:23:50 +02:00