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Insert two blank SlotIndexes between basic blocks instead of just one.

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This is the first small step towards using closed intervals for liveness instead
of the half-open intervals we're using now.

We want to be able to distinguish between a SlotIndex that represents a variable
being live-out of a basic block, and an index representing a variable live-in to
its successor.

That requires two separate indexes between blocks. One for live-outs and one for
live-ins.

With this change, getMBBEndIdx(MBB).getPrevSlot() becomes stable so it stays
greater than any instructions inserted at the end of MBB.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118747 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2010-11-11 00:19:20 +00:00
parent 40d438e20a
commit 1e8e72d72a
2 changed files with 8 additions and 2 deletions
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2
include/llvm/CodeGen/SlotIndexes.h
View File

@ -738,6 +738,7 @@ namespace llvm {
MachineFunction::iterator nextMBB =
llvm::next(MachineFunction::iterator(mbb));
IndexListEntry *startEntry = createEntry(0, 0);
IndexListEntry *stopEntry = createEntry(0, 0);
IndexListEntry *nextEntry = 0;
if (nextMBB == mbb->getParent()->end()) {
@ -747,6 +748,7 @@ namespace llvm {
}
insert(nextEntry, startEntry);
insert(nextEntry, stopEntry);
SlotIndex startIdx(startEntry, SlotIndex::LOAD);
SlotIndex endIdx(nextEntry, SlotIndex::LOAD);

8
lib/CodeGen/SlotIndexes.cpp
View File

@ -127,8 +127,12 @@ bool SlotIndexes::runOnMachineFunction(MachineFunction &fn) {
index += (Slots + 1) * SlotIndex::NUM;
}
// One blank instruction at the end.
push_back(createEntry(0, index));
// We insert two blank instructions between basic blocks.
// One to represent live-out registers and one to represent live-ins.
push_back(createEntry(0, index));
index += SlotIndex::NUM;
push_back(createEntry(0, index));
SlotIndex blockEndIndex(back(), SlotIndex::LOAD);
mbb2IdxMap.insert(