#include "llvm/Pass.h"
#include "llvm/BasicBlock.h"
#include "llvm/Function.h"
+#include "llvm/IntrinsicInst.h"
#include "llvm/Instructions.h"
#include "llvm/Type.h"
#include "llvm/Target/TargetData.h"
AliasAnalysis::ModRefBehavior
AliasAnalysis::getModRefBehavior(CallSite CS,
std::vector<PointerAccessInfo> *Info) {
+ if (IntrinsicInst* II = dyn_cast<IntrinsicInst>(CS.getInstruction())) {
+ switch (II->getIntrinsicID()) {
+ case Intrinsic::atomic_cmp_swap:
+ case Intrinsic::atomic_load_add:
+ case Intrinsic::atomic_load_and:
+ case Intrinsic::atomic_load_max:
+ case Intrinsic::atomic_load_min:
+ case Intrinsic::atomic_load_nand:
+ case Intrinsic::atomic_load_or:
+ case Intrinsic::atomic_load_sub:
+ case Intrinsic::atomic_load_umax:
+ case Intrinsic::atomic_load_umin:
+ case Intrinsic::atomic_load_xor:
+ case Intrinsic::atomic_swap:
+ // CAS and related intrinsics only access their arguments.
+ return AliasAnalysis::AccessesArguments;
+ default:
+ break;
+ }
+ }
+
if (CS.doesNotAccessMemory())
// Can't do better than this.
return DoesNotAccessMemory;