Add a RegisterClassInfo class that lazily caches information about

[oota-llvm.git] / lib / Analysis / ConstantFolding.cpp

diff --git a/lib/Analysis/ConstantFolding.cpp b/lib/Analysis/ConstantFolding.cpp
index 5de2b04e80dd9d81670b6880f090112de6375b52..08a6065b31ac7a357f53253062532dd2884c6a89 100644 (file)
--- a/lib/Analysis/ConstantFolding.cpp
+++ b/lib/Analysis/ConstantFolding.cpp
@@ -1085,7 +1085,7 @@ llvm::canConstantFoldCallTo(const Function *F) {
   case 'c':
     return Name == "cos" || Name == "ceil" || Name == "cosf" || Name == "cosh";
   case 'e':
-    return Name == "exp";
+    return Name == "exp" || Name == "exp2";
   case 'f':
     return Name == "fabs" || Name == "fmod" || Name == "floor";
   case 'l':
@@ -1221,6 +1221,12 @@ llvm::ConstantFoldCall(Function *F,
       case 'e':
         if (Name == "exp")
           return ConstantFoldFP(exp, V, Ty);
+  
+        if (Name == "exp2") {
+          // Constant fold exp2(x) as pow(2,x) in case the host doesn't have a
+          // C99 library.
+          return ConstantFoldBinaryFP(pow, 2.0, V, Ty);
+        }
         break;
       case 'f':
         if (Name == "fabs")