Implementation of __builtin_ctlz.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@51595 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGBuiltin.cpp b/lib/CodeGen/CGBuiltin.cpp
index a43649d..232f6d6 100644
--- a/lib/CodeGen/CGBuiltin.cpp
+++ b/lib/CodeGen/CGBuiltin.cpp
@@ -192,6 +192,20 @@
Result = Builder.CreateIntCast(Result, ResultType, "cast");
return RValue::get(Result);
}
+ case Builtin::BI__builtin_clz:
+ case Builtin::BI__builtin_clzl:
+ case Builtin::BI__builtin_clzll: {
+ Value *ArgValue = EmitScalarExpr(E->getArg(0));
+
+ const llvm::Type *ArgType = ArgValue->getType();
+ Value *F = CGM.getIntrinsic(Intrinsic::ctlz, &ArgType, 1);
+
+ const llvm::Type *ResultType = ConvertType(E->getType());
+ Value *Result = Builder.CreateCall(F, ArgValue, "tmp");
+ if (Result->getType() != ResultType)
+ Result = Builder.CreateIntCast(Result, ResultType, "cast");
+ return RValue::get(Result);
+ }
case Builtin::BI__builtin_expect:
return RValue::get(EmitScalarExpr(E->getArg(0)));
case Builtin::BI__builtin_bswap32: