diff options
Diffstat (limited to 'src/interp/g-opt.boot')
| -rw-r--r-- | src/interp/g-opt.boot | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/src/interp/g-opt.boot b/src/interp/g-opt.boot index 27811638..e26c8089 100644 --- a/src/interp/g-opt.boot +++ b/src/interp/g-opt.boot @@ -448,7 +448,7 @@ $VMsideEffectFreeOperators == %bitveccopy %bitvecconc %bitveclength %bitvecref %bitveceq %bitveclt %before? %equal %sptreq %ident? %property %tref %writeString %writeNewline %writeLine - %void) + %void %retract %pullback) ++ List of simple VM operators $simpleVMoperators == @@ -682,10 +682,23 @@ optRetract ["%retract",e,m,pred] == e isnt [.,:.] => cond := simplifyVMForm substitute(e,"#1",pred) cond is '%true => e - ["check-subtype",cond,MKQ m,e] + ['%when,[cond,e],['%otherwise,['moanRetract,e,MKQ m]]] g := gensym() - ['%bind,[[g,e]],["check-subtype",substitute(g,"#1",pred),MKQ m,g]] - + ['%bind,[[g,e]], + ['%when,[substitute(g,"#1",pred),g], + ['%otherwise,['moanRetract,g,MKQ m]]]] + +++ We have an expression `x' of some Union type. Expand an attempted +++ pullback to the `n'th branch of type `t'. +optPullback ['%pullback,x,t,n] == + y := + ident? x => x + gensym() + expr := + ['%when,[['%ieq,['%head,y],n],['%tail,y]], + ['%otherwise,['moanRetract,y,MKQ t]]] + symbolEq?(x,y) => expr + ['%bind,[[y,x]],expr] --% Boolean expression transformers @@ -878,6 +891,7 @@ for x in '((%call optCall) _ (CATCH optCatch)_ (%when optCond)_ (%retract optRetract)_ + (%pullback optPullback)_ (%CollectV optCollectVector)) _ repeat property(first x,'OPTIMIZE) := second x --much quicker to call functions if they have an SBC |