project-base/server-skynet-source-3rd-jemalloc
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Use $((...)) instead of expr.

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Use $((...)) for math in size_classes.h rather than expr, because it is
much faster.  This is not supported syntax in the classic Bourne shell,
but all modern sh implementations support it, including bash, zsh, and
ash.
This commit is contained in:
Jason Evans 2012-04-03 13:20:21 -07:00
parent 9d4d76874d
commit 12a6845b6c
1 changed files with 15 additions and 15 deletions
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30
include/jemalloc/internal/size_classes.sh
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@ -17,8 +17,8 @@ pow2() {
e=$1
pow2_result=1
while [ ${e} -gt 0 ] ; do
pow2_result=`expr ${pow2_result} + ${pow2_result}`
e=`expr ${e} - 1`
pow2_result=$((${pow2_result} + ${pow2_result}))
e=$((${e} - 1))
done
}
@ -45,7 +45,7 @@ EOF
bin=0
psz=0
sz=${t}
delta=`expr ${sz} - ${psz}`
delta=$((${sz} - ${psz}))
cat <<EOF
/* SIZE_CLASS(bin, delta, sz) */
#define SIZE_CLASSES \\
@ -56,30 +56,30 @@ EOF
cat <<EOF
SIZE_CLASS(${bin}, ${delta}, ${sz}) \\
EOF
bin=`expr ${bin} + 1`
bin=$((${bin} + 1))
psz=${sz}
sz=`expr ${sz} + ${sz}`
delta=`expr ${sz} - ${psz}`
sz=$((${sz} + ${sz}))
delta=$((${sz} - ${psz}))
done
# Quantum-multiple size classes. For each doubling of sz, as many as 4
# size classes exist. Their spacing is the greater of:
# - q
# - sz/4, where sz is a power of 2
while [ ${sz} -lt ${p} ] ; do
if [ ${sz} -ge `expr ${q} \* 4` ] ; then
i=`expr ${sz} / 4`
if [ ${sz} -ge $((${q} * 4)) ] ; then
i=$((${sz} / 4))
else
i=${q}
fi
next_2pow=`expr ${sz} \* 2`
next_2pow=$((${sz} * 2))
while [ ${sz} -lt $next_2pow ] ; do
cat <<EOF
SIZE_CLASS(${bin}, ${delta}, ${sz}) \\
EOF
bin=`expr ${bin} + 1`
bin=$((${bin} + 1))
psz=${sz}
sz=`expr ${sz} + ${i}`
delta=`expr ${sz} - ${psz}`
sz=$((${sz} + ${i}))
delta=$((${sz} - ${psz}))
done
done
cat <<EOF
@ -89,11 +89,11 @@ EOF
#endif
EOF
lg_p=`expr ${lg_p} + 1`
lg_p=$((${lg_p} + 1))
done
lg_t=`expr ${lg_t} + 1`
lg_t=$((${lg_t} + 1))
done
lg_q=`expr ${lg_q} + 1`
lg_q=$((${lg_q} + 1))
done
cat <<EOF