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Tighten the insert() API for bundled instructions.

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The normal insert() function takes an MBB::iterator position, and
inserts a stand-alone MachineInstr as before.

The insert() function that takes an MBB::instr_iterator position can
insert instructions inside a bundle, and will now update the bundle
flags correctly when that happens.

When the insert position is between two bundles, it is unclear whether
the instruction should be appended to the previous bundle, prepended to
the next bundle, or stand on its own. The MBB::insert() function doesn't
bundle the instruction in that case, use the MIBundleBuilder class for
that.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170437 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2012-12-18 17:54:53 +00:00
parent ca2dd36c39
commit edc3503ca5
2 changed files with 32 additions and 14 deletions
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12
lib/CodeGen/MachineBasicBlock.cpp
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@@ -814,6 +814,18 @@ MachineInstr *MachineBasicBlock::remove_instr(MachineInstr *MI) {
return Insts.remove(MI);
}
MachineBasicBlock::instr_iterator
MachineBasicBlock::insert(instr_iterator I, MachineInstr *MI) {
assert(!MI->isBundledWithPred() && !MI->isBundledWithSucc() &&
"Cannot insert instruction with bundle flags");
// Set the bundle flags when inserting inside a bundle.
if (I != instr_end() && I->isBundledWithPred()) {
MI->setFlag(MachineInstr::BundledPred);
MI->setFlag(MachineInstr::BundledSucc);
}
return Insts.insert(I, MI);
}
void MachineBasicBlock::splice(MachineBasicBlock::iterator where,
MachineBasicBlock *Other,
MachineBasicBlock::iterator From) {