Implemented all but one (RAN) of the intrinsic functions in appendix N by mapping them directly to the C versions

backends/GenerateC.hs

@@ -53,6 +53,7 @@ import CompState
 import Errors
 import EvalConstants
 import EvalLiterals
+import Intrinsics
 import GenerateCBased
 import Metadata
 import Pass
@@ -940,9 +941,12 @@ cgenTypeSymbol s t
 
 cgenIntrinsicFunction :: Meta -> String -> [A.Expression] -> CGen ()
 cgenIntrinsicFunction m s es
-    =  do tell ["occam_", [if c == '.' then '_' else c | c <- s], "("]
-          sequence [call genExpression e >> genComma | e <- es]
-          genMeta m
+    =  do let (funcName, giveMeta) = case lookup s simpleFloatIntrinsics of
+                  Just (_,cName) -> (cName, False)
+                  Nothing -> ("occam_" ++ [if c == '.' then '_' else c | c <- s], True)
+          tell [funcName, "("]
+          seqComma [call genExpression e | e <- es]
+          when (giveMeta) $ genComma >> genMeta m
           tell [")"]
 --}}}
 
@@ -1542,12 +1546,14 @@ cgenAssign m [v] (A.ExpressionList _ [e])
              tell [";"]
 cgenAssign m (v:vs) (A.IntrinsicFunctionCallList _ n es)
     = do call genVariable v
-         tell ["=occam_",[if c == '.' then '_' else c | c <- n],"("]
+         let (funcName, giveMeta) = case lookup n simpleFloatIntrinsics of
+                Just (_,cName) -> (cName, False)
+                Nothing -> ("occam_" ++ [if c == '.' then '_' else c | c <- n], True)
+         tell ["=",funcName,"("]
          seqComma $ map (call genExpression) es
          mapM (\v -> tell [","] >> call genActual (A.Formal A.Abbrev A.Int (A.Name
            emptyMeta "dummy_intrinsic_param")) (A.ActualVariable v)) vs
-         tell [","]
-         genMeta m
+         when giveMeta $ genComma >> genMeta m
          tell [");"]
          
 cgenAssign m _ _ = call genMissing "Cannot perform assignment with multiple destinations or multiple sources"

common/Intrinsics.hs

@@ -21,6 +21,8 @@ module Intrinsics where
 
 import qualified AST as A
 
+import Data.Char
+
 intrinsicFunctions :: [(String, ([A.Type], [(A.Type, String)]))]
 intrinsicFunctions =
     [ -- Multiple length arithmetic functions
@@ -73,6 +75,11 @@ intrinsicFunctions =
       , ("SCALEB", ([A.Real32], [(A.Real32, "X"), (A.Int, "n")]))
       , simple "SQRT"      
       ]
+
+      -- Elementary floating point functions
+      -- Appendix N of the occam 2 manual (and section J.4)
+      ++ [(n, ts) | (n, (ts, _)) <- simpleFloatIntrinsics]
+      ++ [("RAN", ([A.Real32, A.Int32], [(A.Int32, "N")]))]
     where
       query n = (n, ([A.Bool], [(A.Real32, "X")]))
       simple n = (n, ([A.Real32], [(A.Real32, "X")]))
@@ -90,6 +97,34 @@ intrinsicFunctions =
       dt A.Int32 = A.Int64
       dt t = t
 
+simpleFloatIntrinsics :: [(String, (([A.Type], [(A.Type, String)]), String))]
+simpleFloatIntrinsics = concatMap double $
+    -- Same order as occam manual:
+  [("ALOG", ([A.Real32], [(A.Real32, "X")]), "log")
+  ,("ALOG10", ([A.Real32], [(A.Real32, "X")]), "log10")
+  ] ++ map s [
+    "EXP",
+    "TAN",
+    "SIN",
+    "ASIN",
+    "COS",
+    "ACOS",
+    "SINH",
+    "COSH",
+    "TANH",
+    "ATAN",
+    "ATAN2"
+  ]
+  ++ [("POWER", ([A.Real32], [(A.Real32, "X"), (A.Real32, "Y")]), "pow")]
+  where
+    s n = (n, ([A.Real32], [(A.Real32, "X")]), map toLower n)
+    
+    double (occn, ts@(rts, pts), cn) = [(occn, (ts, cn++"f")),
+      ("D"++occn, ((map dt rts, zip (map (dt . fst) pts) (map snd pts)), cn))]
+    dt A.Real32 = A.Real64
+    dt A.Int32 = A.Int64
+    dt t = t
+
 intrinsicProcs :: [(String, [(A.AbbrevMode, A.Type, String)])]
 intrinsicProcs =
     [ ("ASSERT", [(A.ValAbbrev, A.Bool, "value")])