Cross Reference: /external/llvm/lib/Target/SystemZ/SystemZElimCompare.cpp

Lines Matching defs:Compare
78   bool convertToBRCT(MachineInstr *MI, MachineInstr *Compare,
81   bool adjustCCMasksForInstr(MachineInstr *MI, MachineInstr *Compare,
83   bool optimizeCompareZero(MachineInstr *Compare,
85   bool fuseCompareAndBranch(MachineInstr *Compare,
161 // Compare compares the result of MI against zero.  If MI is an addition
165 SystemZElimCompare::convertToBRCT(MachineInstr *MI, MachineInstr *Compare,
189   // MI and Compare.  Make sure that there are also no references between
190   // Compare and Branch.
191   unsigned SrcReg = Compare->getOperand(0).getReg();
192   MachineBasicBlock::iterator MBBI = Compare, MBBE = Branch;
231 adjustCCMasksForInstr(MachineInstr *MI, MachineInstr *Compare,
241   unsigned CompareFlags = Compare->getDesc().TSFlags;
295   MachineBasicBlock::iterator MBBI = MI, MBBE = Compare;
302 // Return true if Compare is a comparison against zero.
303 static bool isCompareZero(MachineInstr *Compare) {
304   switch (Compare->getOpcode()) {
311     return (Compare->getNumExplicitOperands() == 2 &&
312             Compare->getOperand(1).isImm() &&
313             Compare->getOperand(1).getImm() == 0);
317 // Try to optimize cases where comparison instruction Compare is testing
318 // a value against zero.  Return true on success and if Compare should be
320 // value produced by Compare.
322 optimizeCompareZero(MachineInstr *Compare,
324   if (!isCompareZero(Compare))
328   unsigned SrcReg = Compare->getOperand(0).getReg();
329   unsigned SrcSubReg = Compare->getOperand(0).getSubReg();
330   MachineBasicBlock &MBB = *Compare->getParent();
331   MachineBasicBlock::iterator MBBI = Compare, MBBE = MBB.begin();
338       // Try to remove both MI and Compare by converting a branch to BRCT(G).
340       // Compare.
341       if (!CCRefs.Use && !SrcRefs && convertToBRCT(MI, Compare, CCUsers)) {
345       // Try to eliminate Compare by reusing a CC result from MI.
347           (!CCRefs.Def && adjustCCMasksForInstr(MI, Compare, CCUsers))) {
362 // Try to fuse comparison instruction Compare into a later branch.
363 // Return true on success and if Compare is therefore redundant.
365 fuseCompareAndBranch(MachineInstr *Compare,
368   unsigned FusedOpcode = TII->getCompareAndBranch(Compare->getOpcode(),
369                                                   Compare);
381   unsigned SrcReg = Compare->getOperand(0).getReg();
382   unsigned SrcReg2 = (Compare->getOperand(1).isReg() ?
383                       Compare->getOperand(1).getReg() : 0);
384   MachineBasicBlock::iterator MBBI = Compare, MBBE = Branch;
407     .addOperand(Compare->getOperand(0))
408     .addOperand(Compare->getOperand(1))
414   MBBI = Compare;
430   // all CC users as we go.  The subroutines can delete Compare and