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Remove the VdbeOp.opflags field and its associated initialization overhead.

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Update mkopcodeh.tcl to reorder opcode numbers to help the resolveP2Values()
routine run faster.

FossilOrigin-Name: 099478fa7521ba52262ef2bf24dd8f0114ce92e1
This commit is contained in:
drh
2016-04-11 13:36:42 +00:00
parent 8679fbabaa
commit 7cc84c2cdd
7 changed files with 165 additions and 121 deletions
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35
tool/mkopcodeh.tcl
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@ -20,8 +20,7 @@
# during code generation, we need to generate corresponding opcodes like
# OP_Add and OP_Divide. By making TK_ADD==OP_Add and TK_DIVIDE==OP_Divide,
# code to translate from one to the other is avoided. This makes the
# code generator run (infinitesimally) faster and more importantly it makes
# the library footprint smaller.
# code generator smaller and faster.
#
# This script also scans for lines of the form:
#
@ -159,7 +158,29 @@ for {set i 0} {$i<$nOp} {incr i} {
}
}
# Generate the numeric values for remaining opcodes
# Assign the next group of values to JUMP opcodes
#
for {set i 0} {$i<$nOp} {incr i} {
set name $order($i)
if {$op($name)>=0} continue
if {!$jump($name)} continue
incr cnt
while {[info exists used($cnt)]} {incr cnt}
set op($name) $cnt
set used($cnt) 1
set def($cnt) $name
}
# Find the numeric value for the largest JUMP opcode
#
set mxJump -1
for {set i 0} {$i<$nOp} {incr i} {
set name $order($i)
if {$jump($name) && $op($name)>$mxJump} {set mxJump $op($name)}
}
# Generate the numeric values for all remaining opcodes
#
for {set i 0} {$i<$nOp} {incr i} {
set name $order($i)
@ -232,3 +253,11 @@ for {set i 0} {$i<=$max} {incr i} {
}
}
puts "\175"
puts ""
puts "/* The sqlite3P2Values() routine is able to run faster if it knows"
puts "** the value of the largest JUMP opcode. The smaller the maximum"
puts "** JUMP opcode the better, so the mkopcodeh.tcl script that"
puts "** generated this include file strives to group all JUMP opcodes"
puts "** together near the beginning of the list."
puts "*/"
puts "#define OP_MX_JUMP $mxJump /* Maximum JUMP opcode */"