From 02cff9dfe0e5f6b9a92949ee988989e16d764f8b Mon Sep 17 00:00:00 2001
From: Roman Leshchinskiy <rl@cse.unsw.edu.au>
Date: Tue, 31 Jul 2007 06:50:24 +0000
Subject: [PATCH] More vectorisation-related smart constructors

---
 compiler/vectorise/VectCore.hs  |   30 +++++++++++++++++++++++--
 compiler/vectorise/Vectorise.hs |   46 +++++++++++++++++----------------------
 2 files changed, 48 insertions(+), 28 deletions(-)

diff --git a/compiler/vectorise/VectCore.hs b/compiler/vectorise/VectCore.hs
index 63178bd..9118214 100644
--- a/compiler/vectorise/VectCore.hs
+++ b/compiler/vectorise/VectCore.hs
@@ -1,20 +1,25 @@
 module VectCore (
-  Vect, VVar, VExpr,
+  Vect, VVar, VExpr, VBind,
 
   vectorised, lifted,
   mapVect,
 
-  vVar, mkVLams, mkVVarApps
+  vNonRec, vRec,
+
+  vVar, vType, vNote, vLet,
+  mkVLams, mkVVarApps
 ) where
 
 #include "HsVersions.h"
 
 import CoreSyn
+import Type           ( Type )
 import Var
 
 type Vect a = (a,a)
 type VVar   = Vect Var
 type VExpr  = Vect CoreExpr
+type VBind  = Vect CoreBind
 
 vectorised :: Vect a -> a
 vectorised = fst
@@ -25,9 +30,30 @@ lifted = snd
 mapVect :: (a -> b) -> Vect a -> Vect b
 mapVect f (x,y) = (f x, f y)
 
+zipWithVect :: (a -> b -> c) -> Vect a -> Vect b -> Vect c
+zipWithVect f (x1,y1) (x2,y2) = (f x1 x2, f y1 y2)
+
 vVar :: VVar -> VExpr
 vVar = mapVect Var
 
+vType :: Type -> VExpr
+vType ty = (Type ty, Type ty)
+
+vNote :: Note -> VExpr -> VExpr
+vNote = mapVect . Note
+
+vNonRec :: VVar -> VExpr -> VBind
+vNonRec = zipWithVect NonRec
+
+vRec :: [VVar] -> [VExpr] -> VBind
+vRec vs es = (Rec (zip vvs ves), Rec (zip lvs les))
+  where
+    (vvs, lvs) = unzip vs
+    (ves, les) = unzip es
+
+vLet :: VBind -> VExpr -> VExpr
+vLet = zipWithVect Let
+
 mkVLams :: [VVar] -> VExpr -> VExpr
 mkVLams vvs (ve,le) = (mkLams vs ve, mkLams ls le)
   where
diff --git a/compiler/vectorise/Vectorise.hs b/compiler/vectorise/Vectorise.hs
index ce4f175..489d6cc 100644
--- a/compiler/vectorise/Vectorise.hs
+++ b/compiler/vectorise/Vectorise.hs
@@ -34,6 +34,7 @@ import OccName
 import DsMonad hiding (mapAndUnzipM)
 import DsUtils              ( mkCoreTup, mkCoreTupTy )
 
+import Literal              ( Literal )
 import PrelNames
 import TysWiredIn
 import TysPrim              ( intPrimTy )
@@ -179,6 +180,12 @@ vectPolyVar lc v tys
                             lexpr <- replicatePA vexpr (Var lc)
                             return (vexpr, lexpr)
 
+vectLiteral :: Var -> Literal -> VM VExpr
+vectLiteral lc lit
+  = do
+      lexpr <- replicatePA (Lit lit) (Var lc)
+      return (Lit lit, lexpr)
+
 vectPolyExpr :: Var -> CoreExprWithFVs -> VM VExpr
 vectPolyExpr lc expr
   = polyAbstract tvs $ \abstract ->
@@ -191,22 +198,14 @@ vectPolyExpr lc expr
                 
 vectExpr :: Var -> CoreExprWithFVs -> VM VExpr
 vectExpr lc (_, AnnType ty)
-  = do
-      vty <- vectType ty
-      return (Type vty, Type vty)
+  = liftM vType (vectType ty)
 
 vectExpr lc (_, AnnVar v) = vectVar lc v
 
-vectExpr lc (_, AnnLit lit)
-  = do
-      let vexpr = Lit lit
-      lexpr <- replicatePA vexpr (Var lc)
-      return (vexpr, lexpr)
+vectExpr lc (_, AnnLit lit) = vectLiteral lc lit
 
 vectExpr lc (_, AnnNote note expr)
-  = do
-      (vexpr, lexpr) <- vectExpr lc expr
-      return (Note note vexpr, Note note lexpr)
+  = liftM (vNote note) (vectExpr lc expr)
 
 vectExpr lc e@(_, AnnApp _ arg)
   | isAnnTypeArg arg
@@ -225,24 +224,19 @@ vectExpr lc (_, AnnCase expr bndr ty alts)
 
 vectExpr lc (_, AnnLet (AnnNonRec bndr rhs) body)
   = do
-      (vrhs, lrhs) <- vectPolyExpr lc rhs
-      ((vbndr, lbndr), (vbody, lbody)) <- vectBndrIn bndr (vectExpr lc body)
-      return (Let (NonRec vbndr vrhs) vbody,
-              Let (NonRec lbndr lrhs) lbody)
+      vrhs <- vectPolyExpr lc rhs
+      (vbndr, vbody) <- vectBndrIn bndr (vectExpr lc body)
+      return $ vLet (vNonRec vbndr vrhs) vbody
 
-vectExpr lc (_, AnnLet (AnnRec prs) body)
+vectExpr lc (_, AnnLet (AnnRec bs) body)
   = do
-      (bndrs, (vrhss, vbody, lrhss, lbody)) <- vectBndrsIn bndrs vect
-      let (vbndrs, lbndrs) = unzip bndrs
-      return (Let (Rec (zip vbndrs vrhss)) vbody,
-              Let (Rec (zip lbndrs lrhss)) lbody)
+      (vbndrs, (vrhss, vbody)) <- vectBndrsIn bndrs
+                                $ liftM2 (,)
+                                  (mapM (vectExpr lc) rhss)
+                                  (vectPolyExpr lc body)
+      return $ vLet (vRec vbndrs vrhss) vbody
   where
-    (bndrs, rhss) = unzip prs
-    
-    vect = do
-             (vrhss, lrhss) <- mapAndUnzipM (vectExpr lc) rhss
-             (vbody, lbody) <- vectPolyExpr lc body
-             return (vrhss, vbody, lrhss, lbody)
+    (bndrs, rhss) = unzip bs
 
 vectExpr lc e@(_, AnnLam bndr body)
   | isTyVar bndr = pprPanic "vectExpr" (ppr $ deAnnotate e)
-- 
1.7.10.4