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Add SplitKit API to query and select the current interval being worked on.

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This makes it possible to target multiple registers in one pass.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129374 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-04-12 18:11:31 +00:00
parent dfaf0e2c0e
commit e1b43c3b40
2 changed files with 17 additions and 2 deletions
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9
lib/CodeGen/SplitKit.cpp
View File

@ -557,7 +557,7 @@ VNInfo *SplitEditor::defFromParent(unsigned RegIdx,
}
/// Create a new virtual register and live interval.
void SplitEditor::openIntv() {
unsigned SplitEditor::openIntv() {
assert(!OpenIdx && "Previous LI not closed before openIntv");
// Create the complement as index 0.
@ -567,6 +567,13 @@ void SplitEditor::openIntv() {
// Create the open interval.
OpenIdx = Edit->size();
Edit->create(LIS, VRM);
return OpenIdx;
}
void SplitEditor::selectIntv(unsigned Idx) {
assert(Idx != 0 && "Cannot select the complement interval");
assert(Idx < Edit->size() && "Can only select previously opened interval");
OpenIdx = Idx;
}
SlotIndex SplitEditor::enterIntvBefore(SlotIndex Idx) {

10
lib/CodeGen/SplitKit.h
View File

@ -283,7 +283,15 @@ public:
void reset(LiveRangeEdit&);
/// Create a new virtual register and live interval.
void openIntv();
/// Return the interval index, starting from 1. Interval index 0 is the
/// implicit complement interval.
unsigned openIntv();
/// currentIntv - Return the current interval index.
unsigned currentIntv() const { return OpenIdx; }
/// selectIntv - Select a previously opened interval index.
void selectIntv(unsigned Idx);
/// enterIntvBefore - Enter the open interval before the instruction at Idx.
/// If the parent interval is not live before Idx, a COPY is not inserted.