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Implement the llvm.memcpy intrinsic

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11349 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2004-02-12 17:01:09 +00:00
parent 2a90ba6017
commit 5fe51cc2c4
4 changed files with 35 additions and 2 deletions
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16
lib/CodeGen/IntrinsicLowering.cpp
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@ -13,8 +13,8 @@
#include "llvm/IntrinsicLowering.h"
#include "llvm/Constant.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/Type.h"
#include "llvm/iOther.h"
using namespace llvm;
@ -57,6 +57,20 @@ void DefaultIntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
if (CI->getType() != Type::VoidTy)
CI->replaceAllUsesWith(Constant::getNullValue(CI->getType()));
break; // Simply strip out debugging intrinsics
case Intrinsic::memcpy: {
// The memcpy intrinsic take an extra alignment argument that the memcpy
// libc function does not.
const FunctionType *CFT = Callee->getFunctionType();
FunctionType *FT =
FunctionType::get(*CFT->param_begin(),
std::vector<const Type*>(CFT->param_begin(), CFT->param_end()-1),
false);
Function *MemCpy = M->getOrInsertFunction("memcpy", FT);
new CallInst(MemCpy, std::vector<Value*>(CI->op_begin()+1, CI->op_end()-1),
CI->getName(), CI);
break;
}
}
assert(CI->use_empty() &&