[llvm-commits] [llvm] r101148 - /llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp

[Dan Gohman]

Author: djg
Date: Tue Apr 13 12:07:06 2010
New Revision: 101148

URL: http://llvm.org/viewvc/llvm-project?rev=101148&view=rev
Log:
Add a few comments.

Modified:
    llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp

Modified: llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp?rev=101148&r1=101147&r2=101148&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp Tue Apr 13 12:07:06 2010
@@ -94,9 +94,11 @@
     Reg =
       getRegForValue(Constant::getNullValue(TD.getIntPtrType(V->getContext())));
   } else if (ConstantFP *CF = dyn_cast<ConstantFP>(V)) {
+    // Try to emit the constant directly.
     Reg = FastEmit_f(VT, VT, ISD::ConstantFP, CF);
 
     if (!Reg) {
+      // Try to emit the constant by using an integer constant with a cast.
       const APFloat &Flt = CF->getValueAPF();
       EVT IntVT = TLI.getPointerTy();
 
@@ -320,6 +322,7 @@
   Function *F = cast<CallInst>(I)->getCalledFunction();
   if (!F) return false;
 
+  // Handle selected intrinsic function calls.
   unsigned IID = F->getIntrinsicID();
   switch (IID) {
   default: break;
@@ -440,6 +443,8 @@
     break;
   }
   }
+
+  // An arbitrary call. Bail.
   return false;
 }