1 //===--- ARMBasicBlockInfo.cpp - Utilities for block sizes ---------------===//
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
20 #define DEBUG_TYPE "arm-bb-utils"
26 // mayOptimizeThumb2Instruction - Returns true if optimizeThumb2Instructions
30   switch(MI->getOpcode()) {  in mayOptimizeThumb2Instruction()
47   LLVM_DEBUG(dbgs() << "computeBlockSize: " << MBB->getName() << "\n");  in computeBlockSize()
48   BasicBlockInfo &BBI = BBInfo[MBB->getNumber()];  in computeBlockSize()
54     BBI.Size += TII->getInstSizeInBytes(I);  in computeBlockSize()
65   if (!MBB->empty() && MBB->back().getOpcode() == ARM::tBR_JTr) {  in computeBlockSize()
67     MBB->getParent()->ensureAlignment(Align(4));  in computeBlockSize()
71 /// getOffsetOf - Return the current offset of the specified machine instruction
72 /// from the start of the function.  This offset changes as stuff is moved
75   const MachineBasicBlock *MBB = MI->getParent();  in getOffsetOf()
77   // The offset is composed of two things: the sum of the sizes of all MBB's  in getOffsetOf()
78   // before this instruction's block, and the offset from the start of the block  in getOffsetOf()
80   unsigned Offset = BBInfo[MBB->getNumber()].Offset;  in getOffsetOf()  local
83   for (MachineBasicBlock::const_iterator I = MBB->begin(); &*I != MI; ++I) {  in getOffsetOf()
84     assert(I != MBB->end() && "Didn't find MI in its own basic block?");  in getOffsetOf()
85     Offset += TII->getInstSizeInBytes(*I);  in getOffsetOf()
87   return Offset;  in getOffsetOf()
90 /// isBBInRange - Returns true if the distance between specific MI and
97   unsigned DestOffset = BBInfo[DestBB->getNumber()].Offset;  in isBBInRange()
100                     << " from " << printMBBReference(*MI->getParent())  in isBBInRange()
102                     << " to " << DestOffset << " offset "  in isBBInRange()
103                     << int(DestOffset - BrOffset) << "\t" << *MI);  in isBBInRange()
107     if (DestOffset-BrOffset <= MaxDisp)  in isBBInRange()
110     if (BrOffset-DestOffset <= MaxDisp)  in isBBInRange()
117   assert(BB->getParent() == &MF &&  in adjustBBOffsetsAfter()
118          "Basic block is not a child of the current function.\n");  in adjustBBOffsetsAfter()
120   unsigned BBNum = BB->getNumber();  in adjustBBOffsetsAfter()
121   LLVM_DEBUG(dbgs() << "Adjust block:\n"  in adjustBBOffsetsAfter()
122              << " - name: " << BB->getName() << "\n"  in adjustBBOffsetsAfter()
123              << " - number: " << BB->getNumber() << "\n"  in adjustBBOffsetsAfter()
124              << " - function: " << MF.getName() << "\n"  in adjustBBOffsetsAfter()
125              << "   - blocks: " << MF.getNumBlockIDs() << "\n");  in adjustBBOffsetsAfter()
128     // Get the offset and known bits at the end of the layout predecessor.  in adjustBBOffsetsAfter()
129     // Include the alignment of the current block.  in adjustBBOffsetsAfter()
130     const Align Align = MF.getBlockNumbered(i)->getAlignment();  in adjustBBOffsetsAfter()
131     const unsigned Offset = BBInfo[i - 1].postOffset(Align);  in adjustBBOffsetsAfter()  local
132     const unsigned KnownBits = BBInfo[i - 1].postKnownBits(Align);  in adjustBBOffsetsAfter()
134     // This is where block i begins.  Stop if the offset is already correct,  in adjustBBOffsetsAfter()
138         BBInfo[i].Offset == Offset &&  in adjustBBOffsetsAfter()
142     BBInfo[i].Offset = Offset;  in adjustBBOffsetsAfter()