Add a flag to indicate that an instruction is as cheap (or cheaper) than a move

instruction to execute. This can be used for transformations (like two-address
conversion) to remat an instruction instead of generating a "move"
instruction. The idea is to decrease the live ranges and register pressure and
all that jazz.

llvm-svn: 51660

1 files changed, 3 insertions, 3 deletions

diff --git a/llvm/lib/CodeGen/MachineInstr.cpp b/llvm/lib/CodeGen/MachineInstr.cpp
index 135718acc70..e008c9a61b9 100644
--- a/llvm/lib/CodeGen/MachineInstr.cpp
+++ b/llvm/lib/CodeGen/MachineInstr.cpp
@@ -639,9 +639,9 @@ void MachineInstr::copyPredicates(const MachineInstr *MI) {
   }
 }
 
-/// isSafeToMove - Return true if it is safe to this instruction. If SawStore
-/// true, it means there is a store (or call) between the instruction the
-/// localtion and its intended destination.
+/// isSafeToMove - Return true if it is safe to this instruction. If SawStore is
+/// set to true, it means that there is a store (or call) between the
+/// instruction's location and its intended destination.
 bool MachineInstr::isSafeToMove(const TargetInstrInfo *TII, bool &SawStore) {
   // Ignore stuff that we obviously can't move.
   if (TID->mayStore() || TID->isCall()) {