JehanneOS/mksh
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lesson learned from http://k1024.org/~iusty/blog/entry/perf-null/ – add -DMKSH_SMALL_BUT_FAST which gives more speed (8/20K less cycles, 5/9K less insns, 1.8/2.4k less branches, 65/275 less branch misses) on Debian/amd64 (klibc-static/eglibc) at cost of 0/2 more page faults and 6K/6K more text size

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tg
2012-07-01 15:55:00 +00:00
parent 798cfdc982
commit 4778a2a62f
7 changed files with 19 additions and 18 deletions
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5
Build.sh
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@@ -1,5 +1,5 @@
#!/bin/sh
srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.578 2012/07/01 15:51:24 tg Exp $'
srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.579 2012/07/01 15:54:49 tg Exp $'
#-
# Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
# 2011, 2012
@@ -1486,7 +1486,7 @@ else
#define EXTERN
#define MKSH_INCLUDES_ONLY
#include "sh.h"
__RCSID("$MirOS: src/bin/mksh/Build.sh,v 1.578 2012/07/01 15:51:24 tg Exp $");
__RCSID("$MirOS: src/bin/mksh/Build.sh,v 1.579 2012/07/01 15:54:49 tg Exp $");
int main(void) { printf("Hello, World!\n"); return (0); }
EOF
case $cm in
@@ -2285,6 +2285,7 @@ MKSH_NO_LIMITS omit ulimit code
MKSH_NO_SIGSETJMP define if sigsetjmp is broken or not available
MKSH_NO_SIGSUSPEND use sigprocmask+pause instead of sigsuspend
MKSH_SMALL omit some code, optimise hard for size (slower)
MKSH_SMALL_BUT_FAST disable some hard-for-size optim. (modern sys.)
MKSH_S_NOVI=1 disable Vi editing mode (default if MKSH_SMALL)
MKSH_TYPEDEF_SIG_ATOMIC_T define to e.g. 'int' if sig_atomic_t is missing
MKSH_TYPEDEF_SSIZE_T define to e.g. 'long' if your OS has no ssize_t