[llvm-commits] [llvm] r57672 - /llvm/trunk/lib/Target/CBackend/CBackend.cpp

[Chris Lattner]

Author: lattner
Date: Fri Oct 17 01:11:48 2008
New Revision: 57672

URL: http://llvm.org/viewvc/llvm-project?rev=57672&view=rev
Log:
add some simple hacky long double support for the CBE.  This
should work for intel long double, but ppc long double aborts
in convert.

Modified:
    llvm/trunk/lib/Target/CBackend/CBackend.cpp

Modified: llvm/trunk/lib/Target/CBackend/CBackend.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/CBackend/CBackend.cpp?rev=57672&r1=57671&r2=57672&view=diff

==============================================================================
--- llvm/trunk/lib/Target/CBackend/CBackend.cpp (original)
+++ llvm/trunk/lib/Target/CBackend/CBackend.cpp Fri Oct 17 01:11:48 2008
@@ -1129,11 +1129,21 @@
                        "long double")
           << "*)&FPConstant" << I->second << ')';
     } else {
-      assert(FPC->getType() == Type::FloatTy || 
-             FPC->getType() == Type::DoubleTy);
-      double V = FPC->getType() == Type::FloatTy ? 
-                 FPC->getValueAPF().convertToFloat() : 
-                 FPC->getValueAPF().convertToDouble();
+      double V;
+      if (FPC->getType() == Type::FloatTy)
+        V = FPC->getValueAPF().convertToFloat();
+      else if (FPC->getType() == Type::DoubleTy)
+        V = FPC->getValueAPF().convertToDouble();
+      else {
+        // Long double.  Convert the number to double, discarding precision.
+        // This is not awesome, but it at least makes the CBE output somewhat
+        // useful.
+        APFloat Tmp = FPC->getValueAPF();
+        bool LosesInfo;
+        Tmp.convert(APFloat::IEEEdouble, APFloat::rmTowardZero, &LosesInfo);
+        V = Tmp.convertToDouble();
+      }
+      
       if (IsNAN(V)) {
         // The value is NaN