1 //===------- HexagonCopyToCombine.cpp - Hexagon Copy-To-Combine Pass ------===//
8 // This pass replaces transfer instructions by combine instructions.
11 // replace them with a combine instruction.
34 #define DEBUG_TYPE "hexagon-copy-combine"
78     return "Hexagon Copy-To-Combine Pass";  in getPassName()
94   void combine(MachineInstr &I1, MachineInstr &I2,
122 INITIALIZE_PASS(HexagonCopyToCombine, "hexagon-copy-combine",
123                 "Hexagon Copy-To-Combine Pass", false, false)
149     // workaround for an ABI bug that prevents GOT relocations on combine  in isCombinableInstType()
154     // Only combine constant extended A2_tfrsi if we are in aggressive mode.  in isCombinableInstType()
180 /// into a combine (ignoring register constraints).
204     // There is no combine of two constant extended values.  in areCombinableOperations()
210   // There is a combine of two constant extended values into CONST64,  in areCombinableOperations()
217   // There is no combine of two constant extended values, unless handled above  in areCombinableOperations()
218   // Make both 8-bit size checks to allow both combine (#,##) and combine(##,#)  in areCombinableOperations()
257 /// that the two instructions can be paired in a combine.
265   // It is not safe to move I1 and I2 into one combine if I2 has a true  in isSafeToMoveTogether()
377       // the new COMBINE instruction.  in isSafeToMoveTogether()
469   // Combine aggressively (for code size)  in runOnMachineFunction()
490       // Don't combine a TFR whose user could be newified (instructions that  in runOnMachineFunction()
500       // Find a second instruction that can be merged into a combine  in runOnMachineFunction()
508         combine(I1, *I2, MI, DoInsertAtI1, OptForSize);  in runOnMachineFunction()
517 /// COMBINE instruction or 0 if no such instruction can be found. Returns true
518 /// in \p DoInsertAtI1 if the combine must be inserted at instruction \p I1
519 /// false if the combine must be inserted at the returned instruction.
539     // Don't combine a TFR whose user could be newified.  in findPairable()
569 void HexagonCopyToCombine::combine(MachineInstr &I1, MachineInstr &I2,  in combine()  function in HexagonCopyToCombine
607   // There is a combine of two constant extended values into CONST64.  in combine()
612   // Emit combine.  in combine()
746   // Insert new combine instruction.  in emitCombineII()
747   //  DoubleRegDest = combine #HiImm, #LoImm  in emitCombineII()
794   // Insert new combine instruction.  in emitCombineIR()
795   //  DoubleRegDest = combine #HiImm, LoReg  in emitCombineIR()
843   // Insert new combine instruction.  in emitCombineRI()
844   //  DoubleRegDest = combine HiReg, #LoImm  in emitCombineRI()
862   // Insert new combine instruction.  in emitCombineRR()
863   //  DoubleRegDest = combine HiReg, LoReg  in emitCombineRR()