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Pessmistically assume the .align 2 before the first constpool entry adds

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two bytes padding.

llvm-svn: 33734
This commit is contained in:
Evan Cheng 2007-02-01 01:09:47 +00:00
parent 3d8d381600
commit 9f87fca49c
1 changed files with 12 additions and 2 deletions
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14
lib/Target/ARM/ARMConstantIslandPass.cpp
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@ -339,6 +339,13 @@ void ARMConstantIslands::InitialFunctionScan(MachineFunction &Fn,
break; break;
} }
} }
// In thumb mode, if this block is a constpool island, pessmisticly assume
// it needs to be padded by two byte so it's aligned on 4 byte boundary.
if (AFI->isThumbFunction() &&
MBB.begin()->getOpcode() == ARM::CONSTPOOL_ENTRY)
MBBSize += 2;
BBSizes.push_back(MBBSize); BBSizes.push_back(MBBSize);
} }
} }
@ -465,8 +472,11 @@ bool ARMConstantIslands::CPEIsInRange(MachineInstr *MI, MachineInstr *CPEMI,
unsigned MaxDisp) { unsigned MaxDisp) {
unsigned PCAdj = AFI->isThumbFunction() ? 4 : 8; unsigned PCAdj = AFI->isThumbFunction() ? 4 : 8;
unsigned UserOffset = GetOffsetOf(MI) + PCAdj; unsigned UserOffset = GetOffsetOf(MI) + PCAdj;
unsigned CPEOffset = GetOffsetOf(CPEMI); // In thumb mode, pessmisticly assumes the .align 2 before the first CPE
// in the island adds two byte padding.
unsigned AlignAdj = AFI->isThumbFunction() ? 2 : 0;
unsigned CPEOffset = GetOffsetOf(CPEMI) + AlignAdj;
DEBUG(std::cerr << "User of CPE#" << CPEMI->getOperand(0).getImm() DEBUG(std::cerr << "User of CPE#" << CPEMI->getOperand(0).getImm()
<< " max delta=" << MaxDisp << " max delta=" << MaxDisp
<< " at offset " << int(UserOffset-CPEOffset) << "\t" << " at offset " << int(UserOffset-CPEOffset) << "\t"