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Fix a problem with blocks that need to be split twice.

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The code could search past the end of the basic block when there was
already a constant pool entry after the block.

Test case with giant basic block in SingleSource/UnitTests/Vector/constpool.c

llvm-svn: 155753
This commit is contained in:
Jakob Stoklund Olesen 2012-04-28 06:21:38 +00:00
parent 55623eaf5a
commit 0fe65fee5f
1 changed files with 5 additions and 3 deletions
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8
lib/Target/ARM/ARMConstantIslandPass.cpp
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@ -1301,9 +1301,10 @@ void ARMConstantIslands::createNewWater(unsigned CPUserIndex,
// pool entries following this block; only the last one is in the water list.
// Back past any possible branches (allow for a conditional and a maximally
// long unconditional).
if (BaseInsertOffset >= BBInfo[UserMBB->getNumber()+1].Offset)
BaseInsertOffset = BBInfo[UserMBB->getNumber()+1].Offset -
(isThumb1 ? 6 : 8);
if (BaseInsertOffset + 8 >= UserBBI.postOffset()) {
BaseInsertOffset = UserBBI.postOffset() - UPad - 8;
DEBUG(dbgs() << format("Move inside block: %#x\n", BaseInsertOffset));
}
unsigned EndInsertOffset = BaseInsertOffset + 4 + UPad +
CPEMI->getOperand(2).getImm();
MachineBasicBlock::iterator MI = UserMI;
@ -1315,6 +1316,7 @@ void ARMConstantIslands::createNewWater(unsigned CPUserIndex,
Offset < BaseInsertOffset;
Offset += TII->GetInstSizeInBytes(MI),
MI = llvm::next(MI)) {
assert(MI != UserMBB->end() && "Fell off end of block");
if (CPUIndex < NumCPUsers && CPUsers[CPUIndex].MI == MI) {
CPUser &U = CPUsers[CPUIndex];
if (!isOffsetInRange(Offset, EndInsertOffset, U)) {