Add __builtin_abs
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@44254 91177308-0d34-0410-b5e6-96231b3b80d8
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);
diff --git a/include/clang/AST/Builtins.def b/include/clang/AST/Builtins.def
index 546c8cf..f0107e5 100644
--- a/include/clang/AST/Builtins.def
+++ b/include/clang/AST/Builtins.def
@@ -55,6 +55,7 @@
BUILTIN(__builtin_inf , "d" , "ncF")
BUILTIN(__builtin_inff , "f" , "ncF")
BUILTIN(__builtin_infl , "Ld" , "ncF")
+BUILTIN(__builtin_abs , "ii" , "ncF")
BUILTIN(__builtin_fabs , "dd" , "ncF")
BUILTIN(__builtin_fabsf, "ff" , "ncF")
BUILTIN(__builtin_fabsl, "LdLd", "ncF")