commit e79dbe20141db33e67e8576ff04ae31eac3456be
author Anders Carlsson <andersca@mac.com> Tue Nov 20 19:05:17 2007 +0000
committer Anders Carlsson <andersca@mac.com> Tue Nov 20 19:05:17 2007 +0000
tree 5fab47230637930c5f31a9eeb53eeab4b4698a45
parent 60476ff62113e982ffe256b77d4031e832fb09c5

Add __builtin_abs

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@44254 91177308-0d34-0410-b5e6-96231b3b80d8

CodeGen/CGBuiltin.cpp

diff --git a/CodeGen/CGBuiltin.cpp b/CodeGen/CGBuiltin.cpp
index 8cdf068..803d89e 100644
--- a/CodeGen/CGBuiltin.cpp
+++ b/CodeGen/CGBuiltin.cpp
@@ -85,6 +85,18 @@
     
     return RValue::get(llvm::ConstantInt::get(Result));
   }
+  case Builtin::BI__builtin_abs: {
+    llvm::Value *ArgValue = EmitScalarExpr(E->getArg(0));   
+    
+    llvm::BinaryOperator *NegOp = 
+      Builder.CreateNeg(ArgValue, (ArgValue->getName() + "neg").c_str());
+    llvm::Value *CmpResult = 
+      Builder.CreateICmpSGE(ArgValue, NegOp->getOperand(0), "abscond");
+    llvm::Value *Result = 
+      Builder.CreateSelect(CmpResult, ArgValue, NegOp, "abs");
+    
+    return RValue::get(Result);
+  }
   }
   
   return RValue::get(0);