The CGCONTROL signature

There is little point in fiddling with these flags to improve the performance of the optimizer. Each flag either has little effect or is already set to an optimum value.

Synopsis

signature CGCONTROL
structure Compiler.Control.CG : CGCONTROL


Interface

val tailrecur : bool ref
val recordopt : bool ref
val specialize : bool ref
val tail : bool ref
val allocprof : bool ref
val closureprint : bool ref
val closureStrategy : int ref
val lambdaopt : bool ref
val cpsopt : bool ref
val rounds : int ref
val path : bool ref
val betacontract : bool ref
val eta : bool ref
val selectopt : bool ref
val dropargs : bool ref
val deadvars : bool ref
val flattenargs : bool ref
val extraflatten : bool ref
val switchopt : bool ref
val handlerfold : bool ref
val branchfold : bool ref
val arithopt : bool ref
val betaexpand : bool ref
val unroll : bool ref
val knownfiddle : bool ref
val invariant : bool ref
val targeting : int ref
val lambdaprop : bool ref
val newconreps : bool ref
val boxedconstconreps : bool ref
val sharepath : bool ref
val staticprof : bool ref
val unroll_recur : bool ref
val hoistup : bool ref
val hoistdown : bool ref
val recordcopy : bool ref
val recordpath : bool ref
val debugcps : bool ref
val misc4 : int ref
val argrep : bool ref
val bodysize : int ref
val reducemore : int ref
val alphac : bool ref
val comment : bool ref
val knownGen : int ref
val knownClGen : int ref
val escapeGen : int ref
val calleeGen : int ref
val spillGen : int ref
val foldconst : bool ref
val etasplit : bool ref
val printLambda : bool ref
val printit : bool ref
val printsize : bool ref
val scheduling : bool ref
val cse : bool ref
val optafterclosure : bool ref
val uncurry : bool ref
val ifidiom : bool ref
val comparefold : bool ref
val csehoist : bool ref
val rangeopt : bool ref
val icount : bool ref
val debugRep : bool ref
val sharewrap : bool ref
val checklty1 : bool ref
val checklty2 : bool ref
val checklty3 : bool ref
val checkcps1 : bool ref
val checkcps2 : bool ref
val checkcps3 : bool ref
val checkcps : bool ref
val liftLiterals : bool ref
val flatfblock : bool ref
val deadup : bool ref
val pollChecks : bool ref
val pollRatioAtoI : real ref
datatype mlrisc_phase
  = NO_PHASE
  | AFTER_INSTR_SEL
  | AFTER_RA
  | AFTER_SCHED
  | PHASES of (mlrisc_phase * mlrisc_phase)
val printFlowgraph : mlrisc_phase ref
val printFlowgraphStream : TextIO.outstream ref
val memDisambiguate : bool ref
val mudebugging : bool ref
val eedebugging : bool ref
val insdebugging : bool ref
val smdebugging : bool ref
val emdebugging : bool ref
val esdebugging : bool ref
val etdebugging : bool ref
val ecdebugging : bool ref
val tmdebugging : bool ref


Description

tailrecur

Obsolete.

recordopt

Constant-fold record expressions, if true.

specialize

Perform monomorphic instantiation of polymorphic functions.

tail

Obsolete.

allocprof

Generate allocation-profiling code, if true.

closureprint

Print information about generated closures, if true.

closureStrategy

Choose flat vs. linked closures.

lambdaopt

Perform reduction of lambda-language before CPS-conversion, if true.

cpsopt

Perform optimization of CPS representation, if true.

rounds

How many alternating rounds of expansion/contraction.

path

Obsolete.

betacontract

Perform beta-contraction of functions called only once.

eta

Perform eta-reduction on CPS.

selectopt

Constant-folding of SELECT expressions.

dropargs

Remove unused arguments to known functions.

deadvars

Eliminate dead variables.

flattenargs

Flatten tupled arguments of known functions. Probably obsolete.

extraflatten

Flatten tupled arguments of known functions, even if this requires extra work at some call sites. Probably obsolete.

switchopt

Constant-folding of SWITCH expressions.

handlerfold

Constant-folding of exception handlers.

branchfold

Optimization of conditional branches whose clauses are alpha-equivalent.

arithopt

Constant-folding of arithmetic operators.

betaexpand

Inline-expansion of functions called more than once.

unroll

Loop unrolling.

knownfiddle

Scope localization of free variables.

invariant

Hoist loop-invariant computations.

targeting

Register targeting of results of subexpressions.

lambdaprop

Obsolete.

newconreps

Use efficient data-constructor representations.

boxedconstconreps

Use boxed constant constructor representations.

sharepath

staticprof

unroll_recur

Unrolling of non-tail-recursive functions.

hoistup

Enlarge scope of variables to merge closures. Obsolete.

hoistdown

Contract scope of variables to merge closures. Obsolete.

recordcopy

recordpath

Perform select-path optimization on record components.

debugcps

misc4

argrep

Use trace-based argument register selection.

bodysize

Control the optimism of the inline expander.

reducemore

Control the propensity of the optimizer to give up when few optimizations are found.

alphac

Perform alpha conversion when necessary.

comment

Generate comments in the assembly code. Obsolete.

knownGen

Count of the number of known functions without closures ever generated.

knownClGen

Count of the number of known functions with closures ever generated.

escapeGen

The number of escaping functions ever generated.

calleeGen

The number of callee-save closures ever generated.

spillGen

The number of spills ever generated.

foldconst

Do constant folding

etasplit

Local/global calling sequences for escaping functions.

printLambda

Show the lambda code of each compilation.

printit

Show the CPS code after each phase.

printsize

Show the size of CPS after each phase.

scheduling

Instruction scheduling.

cse

Common subexpression elimination.

optafterclosure

Perform CPS optimization after the closure phase. Obsolete.

uncurry

Do the uncurrying optimization.

ifidiom

Optimize the special SWITCH statements generated by if expressions.

comparefold

Constant-fold integer comparisons.

csehoist

Hoist common subexpressions. Obsolete.

rangeopt

Do range analysis.

icount

Enable instruction counting.

debugRep

sharewrap

checklty1

checklty2

checklty3

checkcps1

checkcps2

checkcps3

checkcps

liftLiterals

flatfblock

deadup

pollChecks

pollRatioAtoI

datatype mlrisc_phase

printFlowgraph

printFlowgraphStream

memDisambiguate

mudebugging

eedebugging

insdebugging

smdebugging

emdebugging

esdebugging

etdebugging

ecdebugging

tmdebugging