[llvm-commits] [dragonegg] r92703 - /dragonegg/trunk/llvm-convert.cpp

[Duncan Sands]

Author: baldrick
Date: Tue Jan  5 01:18:02 2010
New Revision: 92703

URL: http://llvm.org/viewvc/llvm-project?rev=92703&view=rev
Log:
Port commit 91660 (djg) from llvm-gcc:
Set the NSW flag on signed-integer subtract operators.

Modified:
    dragonegg/trunk/llvm-convert.cpp

Modified: dragonegg/trunk/llvm-convert.cpp
URL: http://llvm.org/viewvc/llvm-project/dragonegg/trunk/llvm-convert.cpp?rev=92703&r1=92702&r2=92703&view=diff

==============================================================================
--- dragonegg/trunk/llvm-convert.cpp (original)
+++ dragonegg/trunk/llvm-convert.cpp Tue Jan  5 01:18:02 2010
@@ -3324,7 +3324,6 @@
   bool RHSIsSigned = !TYPE_UNSIGNED(TREE_TYPE(op1));
   bool TyIsSigned  = !TYPE_UNSIGNED(type);
   bool IsExactDiv  = code == EXACT_DIV_EXPR;
-  bool IsPlus      = code == PLUS_EXPR;
 
   const Type *Ty = ConvertType(type);
   LHS = CastToAnyType(LHS, LHSIsSigned, Ty, TyIsSigned);
@@ -3347,8 +3346,10 @@
   Value *V;
   if (Opc == Instruction::SDiv && IsExactDiv)
     V = Builder.CreateExactSDiv(LHS, RHS);
-  else if (Opc == Instruction::Add && IsPlus && TyIsSigned && !flag_wrapv)
+  else if (Opc == Instruction::Add && TyIsSigned && !flag_wrapv)
     V = Builder.CreateNSWAdd(LHS, RHS);
+  else if (Opc == Instruction::Sub && TyIsSigned && !flag_wrapv)
+    V = Builder.CreateNSWSub(LHS, RHS);
   else
     V = Builder.CreateBinOp((Instruction::BinaryOps)Opc, LHS, RHS);
   if (ResTy != Ty)