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 e=$1
pow2_result=1 pow2_result=1
while [ ${e} -gt 0 ] ; do while [ ${e} -gt 0 ] ; do
pow2_result=`expr ${pow2_result} + ${pow2_result}` pow2_result=$((${pow2_result} + ${pow2_result}))
e=`expr ${e} - 1` e=$((${e} - 1))
done done
} }
@ -45,7 +45,7 @@ EOF
bin=0 bin=0
psz=0 psz=0
sz=${t} sz=${t}
delta=`expr ${sz} - ${psz}` delta=$((${sz} - ${psz}))
cat <<EOF cat <<EOF
/* SIZE_CLASS(bin, delta, sz) */ /* SIZE_CLASS(bin, delta, sz) */
#define SIZE_CLASSES \\ #define SIZE_CLASSES \\
@ -56,30 +56,30 @@ EOF
cat <<EOF cat <<EOF
SIZE_CLASS(${bin}, ${delta}, ${sz}) \\ SIZE_CLASS(${bin}, ${delta}, ${sz}) \\
EOF EOF
bin=`expr ${bin} + 1` bin=$((${bin} + 1))
psz=${sz} psz=${sz}
sz=`expr ${sz} + ${sz}` sz=$((${sz} + ${sz}))
delta=`expr ${sz} - ${psz}` delta=$((${sz} - ${psz}))
done done
# Quantum-multiple size classes. For each doubling of sz, as many as 4 # Quantum-multiple size classes. For each doubling of sz, as many as 4
# size classes exist. Their spacing is the greater of: # size classes exist. Their spacing is the greater of:
# - q # - q
# - sz/4, where sz is a power of 2 # - sz/4, where sz is a power of 2
while [ ${sz} -lt ${p} ] ; do while [ ${sz} -lt ${p} ] ; do
if [ ${sz} -ge `expr ${q} \* 4` ] ; then if [ ${sz} -ge $((${q} * 4)) ] ; then
i=`expr ${sz} / 4` i=$((${sz} / 4))
else else
i=${q} i=${q}
fi fi
next_2pow=`expr ${sz} \* 2` next_2pow=$((${sz} * 2))
while [ ${sz} -lt $next_2pow ] ; do while [ ${sz} -lt $next_2pow ] ; do
cat <<EOF cat <<EOF
SIZE_CLASS(${bin}, ${delta}, ${sz}) \\ SIZE_CLASS(${bin}, ${delta}, ${sz}) \\
EOF EOF
bin=`expr ${bin} + 1` bin=$((${bin} + 1))
psz=${sz} psz=${sz}
sz=`expr ${sz} + ${i}` sz=$((${sz} + ${i}))
delta=`expr ${sz} - ${psz}` delta=$((${sz} - ${psz}))
done done
done done
cat <<EOF cat <<EOF
@ -89,11 +89,11 @@ EOF
#endif #endif
EOF EOF
lg_p=`expr ${lg_p} + 1` lg_p=$((${lg_p} + 1))
done done
lg_t=`expr ${lg_t} + 1` lg_t=$((${lg_t} + 1))
done done
lg_q=`expr ${lg_q} + 1` lg_q=$((${lg_q} + 1))
done done
cat <<EOF cat <<EOF