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Add ability to give hints to the overlaps routines.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17934 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2004-11-18 03:47:34 +00:00
parent cbb5625cec
commit bae74d9192
3 changed files with 41 additions and 9 deletions
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18
lib/CodeGen/LiveInterval.cpp
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@@ -42,6 +42,9 @@ bool LiveInterval::liveAt(unsigned I) const {
return r->contains(I);
}
// overlaps - Return true if the intersection of the two live intervals is
// not empty.
//
// An example for overlaps():
//
// 0: A = ...
@@ -56,11 +59,16 @@ bool LiveInterval::liveAt(unsigned I) const {
//
// A->overlaps(C) should return false since we want to be able to join
// A and C.
bool LiveInterval::overlaps(const LiveInterval& other) const {
Ranges::const_iterator i = ranges.begin();
Ranges::const_iterator ie = ranges.end();
Ranges::const_iterator j = other.ranges.begin();
Ranges::const_iterator je = other.ranges.end();
//
bool LiveInterval::overlapsFrom(const LiveInterval& other,
const_iterator StartPos) const {
const_iterator i = begin();
const_iterator ie = end();
const_iterator j = StartPos;
const_iterator je = other.end();
assert((StartPos->start <= i->start || StartPos == other.begin()) &&
"Bogus start position hint!");
if (i->start < j->start) {
i = std::upper_bound(i, ie, j->start);