Don't convert small integers to reals during code generation

Don't convert small integers to reals during code generation. Small integers may be used in if conditions, and converting these to real numbers creates less efficient code.
ianhinder · Sep 13, 2012 · 0226c2f · 0226c2f
1 parent 2c958c1
commit 0226c2f
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/Tools/CodeGen/CodeGenCactus.m b/Tools/CodeGen/CodeGenCactus.m
@@ -666,8 +666,10 @@
     undoVect[expr_] := expr //. {
       ToReal[x_] -> x,
 
-      x_Integer -> 1.0*x,   (* don't generate large integer constants *)
-      x_Ratio   -> N[x,30],
+      (* don't generate large integer constants *)
+      x_Integer /; Abs[x]>10^9 :> 1.0*x,
+      (* generate sufficient precision *)
+      x_Ratio :> N[x,30],
 
       kneg[x_] -> -x,