//===----------------------------------------------------------------------===//
#include "llvm/IR/Use.h"
+#include "llvm/IR/User.h"
#include "llvm/IR/Value.h"
#include <new>
namespace llvm {
void Use::swap(Use &RHS) {
- Value *V1(Val);
- Value *V2(RHS.Val);
- if (V1 != V2) {
- if (V1) {
- removeFromList();
- }
+ if (Val == RHS.Val)
+ return;
- if (V2) {
- RHS.removeFromList();
- Val = V2;
- V2->addUse(*this);
- } else {
- Val = 0;
- }
+ if (Val)
+ removeFromList();
- if (V1) {
- RHS.Val = V1;
- V1->addUse(RHS);
- } else {
- RHS.Val = 0;
- }
+ Value *OldVal = Val;
+ if (RHS.Val) {
+ RHS.removeFromList();
+ Val = RHS.Val;
+ Val->addUse(*this);
+ } else {
+ Val = nullptr;
+ }
+
+ if (OldVal) {
+ RHS.Val = OldVal;
+ RHS.Val->addUse(RHS);
+ } else {
+ RHS.Val = nullptr;
}
}
: reinterpret_cast<User *>(const_cast<Use *>(End));
}
-// Sets up the waymarking algoritm's tags for a series of Uses. See the
+unsigned Use::getOperandNo() const {
+ return this - getUser()->op_begin();
+}
+
+// Sets up the waymarking algorithm's tags for a series of Uses. See the
// algorithm details here:
//
-// http://www.llvm.org/docs/ProgrammersManual.html#UserLayout
+// http://www.llvm.org/docs/ProgrammersManual.html#the-waymarking-algorithm
//
Use *Use::initTags(Use *const Start, Use *Stop) {
ptrdiff_t Done = 0;