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factor the 'optimized sort' code out into a static helper function

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and use it from one more place.  Patch by Jakub Staszak!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75478 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-07-13 17:20:05 +00:00
parent 6fbc1969e9
commit a2f55dd388
1 changed files with 38 additions and 28 deletions
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66
lib/Analysis/MemoryDependenceAnalysis.cpp
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@ -599,6 +599,42 @@ GetNonLocalInfoForBlock(Value *Pointer, uint64_t PointeeSize,
return Dep;
}
/// SortNonLocalDepInfoCache - Sort the a NonLocalDepInfo cache, given a certain
/// number of elements in the array that are already properly ordered. This is
/// optimized for the case when only a few entries are added.
static void
SortNonLocalDepInfoCache(MemoryDependenceAnalysis::NonLocalDepInfo &Cache,
unsigned NumSortedEntries) {
switch (Cache.size() - NumSortedEntries) {
case 0:
// done, no new entries.
break;
case 2: {
// Two new entries, insert the last one into place.
MemoryDependenceAnalysis::NonLocalDepEntry Val = Cache.back();
Cache.pop_back();
MemoryDependenceAnalysis::NonLocalDepInfo::iterator Entry =
std::upper_bound(Cache.begin(), Cache.end()-1, Val);
Cache.insert(Entry, Val);
// FALL THROUGH.
}
case 1:
// One new entry, Just insert the new value at the appropriate position.
if (Cache.size() != 1) {
MemoryDependenceAnalysis::NonLocalDepEntry Val = Cache.back();
Cache.pop_back();
MemoryDependenceAnalysis::NonLocalDepInfo::iterator Entry =
std::upper_bound(Cache.begin(), Cache.end(), Val);
Cache.insert(Entry, Val);
}
break;
default:
// Added many values, do a full scale sort.
std::sort(Cache.begin(), Cache.end());
break;
}
}
/// getNonLocalPointerDepFromBB - Perform a dependency query based on
/// pointer/pointeesize starting at the end of StartBB. Add any clobber/def
@ -738,7 +774,7 @@ getNonLocalPointerDepFromBB(Value *Pointer, uint64_t PointeeSize,
// getNonLocalPointerDepFromBB and other routines that could reuse the cache
// value will only see properly sorted cache arrays.
if (Cache && NumSortedEntries != Cache->size()) {
std::sort(Cache->begin(), Cache->end());
SortNonLocalDepInfoCache(*Cache, NumSortedEntries);
NumSortedEntries = Cache->size();
}
@ -841,33 +877,7 @@ getNonLocalPointerDepFromBB(Value *Pointer, uint64_t PointeeSize,
}
// Okay, we're done now. If we added new values to the cache, re-sort it.
switch (Cache->size()-NumSortedEntries) {
case 0:
// done, no new entries.
break;
case 2: {
// Two new entries, insert the last one into place.
NonLocalDepEntry Val = Cache->back();
Cache->pop_back();
NonLocalDepInfo::iterator Entry =
std::upper_bound(Cache->begin(), Cache->end()-1, Val);
Cache->insert(Entry, Val);
// FALL THROUGH.
}
case 1:
// One new entry, Just insert the new value at the appropriate position.
if (Cache->size() != 1) {
NonLocalDepEntry Val = Cache->back();
Cache->pop_back();
NonLocalDepInfo::iterator Entry =
std::upper_bound(Cache->begin(), Cache->end(), Val);
Cache->insert(Entry, Val);
}
break;
default:
// Added many values, do a full scale sort.
std::sort(Cache->begin(), Cache->end());
}
SortNonLocalDepInfoCache(*Cache, NumSortedEntries);
DEBUG(AssertSorted(*Cache));
return false;
}