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author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2010-11-11 00:19:20 +0000 |
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committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2010-11-11 00:19:20 +0000 |
commit | 1e8e72d72a71ec3fb6c81bd35a34261f34436900 (patch) | |
tree | a3ce7403dd08269e717c88dea185f780c827fcef /lib/CodeGen | |
parent | 40d438e20ab73b2fb9d1ff06b090128e70fec9e8 (diff) | |
download | external_llvm-1e8e72d72a71ec3fb6c81bd35a34261f34436900.zip external_llvm-1e8e72d72a71ec3fb6c81bd35a34261f34436900.tar.gz external_llvm-1e8e72d72a71ec3fb6c81bd35a34261f34436900.tar.bz2 |
Insert two blank SlotIndexes between basic blocks instead of just one.
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
Diffstat (limited to 'lib/CodeGen')
-rw-r--r-- | lib/CodeGen/SlotIndexes.cpp | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/lib/CodeGen/SlotIndexes.cpp b/lib/CodeGen/SlotIndexes.cpp index adab9ff..277cce3 100644 --- a/lib/CodeGen/SlotIndexes.cpp +++ b/lib/CodeGen/SlotIndexes.cpp @@ -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( |