70   // Unique ID (position in the swap vector).
103   // Swap entries are allocated in a vector for better performance.
107   // their swap entries.  The key is the address of the MI.
111   // Swap entries are represented by their VSEId fields.
126   // Add an entry to the swap vector and swap map.
130   // source register.  VecIdx indicates the swap vector entry to
141   // Record which swap instructions can be safely removed.
148   // Insert a swap instruction from SrcReg to DstReg at the given
156   // Dump a description of the entries in the swap vector.
217 // swap vector and allocate the equivalence class mapping before
238 // Create an entry in the swap vector for each instruction that mentions
271       // of the swap vector.  in gatherVectorInstructions()
289         // This is a swap if it is of the form XXPERMDI t, s, s, 2.  in gatherVectorInstructions()
315         // will not swap the value in the physical register.  Whether  in gatherVectorInstructions()
346         // Permuting loads are marked as both load and swap, and are  in gatherVectorInstructions()
356         // a vector register is safe, provided that we introduce a swap  in gatherVectorInstructions()
371         // Permuting stores are marked as both store and swap, and are  in gatherVectorInstructions()
385         // a SUBREG_TO_REG, which is handled by introducing a swap.  in gatherVectorInstructions()
394         // as well, provided we introduce a swap.  It is generally the  in gatherVectorInstructions()
530     LLVM_DEBUG(dbgs() << "Swap vector when first built\n\n");  in gatherVectorInstructions()
537 // Add an entry to the swap vector and swap map, and make a
556 // flag the swap entry indicated by VecIdx (the original
590   LLVM_DEBUG(dbgs() << "\n*** Forming webs for swap removal ***\n\n");  in formWebs()
622              "Inconsistency: def of vector reg not found in swap map!");  in formWebs()
636 // Walk the swap vector entries looking for conditions that prevent their
642   LLVM_DEBUG(dbgs() << "\n*** Rejecting webs for swap removal ***\n\n");  in recordUnoptimizableWebs()
662                            "swap[pable]\n",  in recordUnoptimizableWebs()
670     // than a swap instruction.  in recordUnoptimizableWebs()
688                          "Web %d rejected for load not feeding swap\n", Repr));  in recordUnoptimizableWebs()
696         // It is possible that the load feeds a swap and that swap feeds a  in recordUnoptimizableWebs()
709                       "Web %d rejected for load/swap feeding a store\n", Repr));  in recordUnoptimizableWebs()
721     // other than a swap instruction.  in recordUnoptimizableWebs()
735                        "Web %d rejected for store not fed by swap\n", Repr));  in recordUnoptimizableWebs()
753                   "Web %d rejected for swap not feeding only stores\n", Repr));  in recordUnoptimizableWebs()
765   LLVM_DEBUG(dbgs() << "Swap vector after web analysis:\n\n");  in recordUnoptimizableWebs()
769 // Walk the swap vector entries looking for swaps fed by permuting loads
771 // has not been marked rejected, mark each such swap for removal.
773 // such that multiple loads feed the same swap, etc.)
791           LLVM_DEBUG(dbgs() << "Marking swap fed by load for removal: ");  in markSwapsForRemoval()
806         LLVM_DEBUG(dbgs() << "Marking swap feeding store for removal: ");  in markSwapsForRemoval()
822 // FIXME: When inserting a swap, we should check whether SrcReg is
823 // defined by another swap:  SrcReg = XXPERMDI Reg, Reg, 2;  If so,
835 // The identified swap entry requires special handling to allow its
903     // We also need to swap kill flag associated with the register.  in handleSpecialSwappables()
916   // wrong lane.  Insert a swap following the copy to fix this.  in handleSpecialSwappables()
936     // prior to the swap, and from VSRC to VRRC following the swap.  in handleSpecialSwappables()
964 // Walk the swap vector and replace each entry marked for removal with
993 // For debug purposes, dump the contents of the swap vector.
1011       dbgs() << "swap ";  in dumpSwapVector()
1068                       "PowerPC VSX Swap Removal", false, false)
1070                     "PowerPC VSX Swap Removal", false, false)