Implement bzero, memset, memmove builtins.
This subsumes Nico Weber's patch and implements bzero in terms
of llvm.memset to match llvm-gcc.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@53888 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGBuiltin.cpp b/lib/CodeGen/CGBuiltin.cpp
index 87d09a9..9de5a5a 100644
--- a/lib/CodeGen/CGBuiltin.cpp
+++ b/lib/CodeGen/CGBuiltin.cpp
@@ -291,18 +291,39 @@
// FIXME: LLVM IR Should allow alloca with an i64 size!
Value *Size = EmitScalarExpr(E->getArg(0));
Size = Builder.CreateIntCast(Size, llvm::Type::Int32Ty, false, "tmp");
- return RValue::get(Builder.CreateAlloca(llvm::Type::Int8Ty, Size,
- "tmp"));
+ return RValue::get(Builder.CreateAlloca(llvm::Type::Int8Ty, Size, "tmp"));
+ }
+ case Builtin::BI__builtin_bzero: {
+ Value *Address = EmitScalarExpr(E->getArg(0));
+ Builder.CreateCall4(CGM.getMemSetFn(), Address,
+ llvm::ConstantInt::get(llvm::Type::Int8Ty, 0),
+ EmitScalarExpr(E->getArg(1)),
+ llvm::ConstantInt::get(llvm::Type::Int32Ty, 1));
+ return RValue::get(Address);
}
case Builtin::BI__builtin_memcpy: {
- Value* MemCpyOps[4] = {
- EmitScalarExpr(E->getArg(0)),
- EmitScalarExpr(E->getArg(1)),
- EmitScalarExpr(E->getArg(2)),
- llvm::ConstantInt::get(llvm::Type::Int32Ty, 0)
- };
- Builder.CreateCall(CGM.getMemCpyFn(), MemCpyOps, MemCpyOps+4);
- return RValue::get(MemCpyOps[0]);
+ Value *Address = EmitScalarExpr(E->getArg(0));
+ Builder.CreateCall4(CGM.getMemCpyFn(), Address,
+ EmitScalarExpr(E->getArg(1)),
+ EmitScalarExpr(E->getArg(2)),
+ llvm::ConstantInt::get(llvm::Type::Int32Ty, 1));
+ return RValue::get(Address);
+ }
+ case Builtin::BI__builtin_memmove: {
+ Value *Address = EmitScalarExpr(E->getArg(0));
+ Builder.CreateCall4(CGM.getMemMoveFn(), Address,
+ EmitScalarExpr(E->getArg(1)),
+ EmitScalarExpr(E->getArg(2)),
+ llvm::ConstantInt::get(llvm::Type::Int32Ty, 1));
+ return RValue::get(Address);
+ }
+ case Builtin::BI__builtin_memset: {
+ Value *Address = EmitScalarExpr(E->getArg(0));
+ Builder.CreateCall4(CGM.getMemSetFn(), Address,
+ EmitScalarExpr(E->getArg(1)),
+ EmitScalarExpr(E->getArg(2)),
+ llvm::ConstantInt::get(llvm::Type::Int32Ty, 1));
+ return RValue::get(Address);
}
case Builtin::BI__builtin_return_address: {
Value *F = CGM.getIntrinsic(Intrinsic::returnaddress, 0, 0);