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If all of the write objects are identified then we can vectorize the loop even if the read objects are unidentified.

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PR14719.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171124 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem
2012-12-26 23:30:53 +00:00
parent e9fd6ad567
commit 5dd839430c
2 changed files with 58 additions and 1 deletions
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6
lib/Transforms/Vectorize/LoopVectorize.cpp
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@ -1704,6 +1704,7 @@ bool LoopVectorizationLegality::canVectorizeMemory() {
// Check that the read-writes do not conflict with other read-write
// pointers.
bool AllWritesIdentified = true;
for (I = ReadWrites.begin(), IE = ReadWrites.end(); I != IE; ++I) {
GetUnderlyingObjects(*I, TempObjects, DL);
for (ValueVector::iterator it=TempObjects.begin(), e=TempObjects.end();
@ -1711,6 +1712,7 @@ bool LoopVectorizationLegality::canVectorizeMemory() {
if (!isIdentifiedObject(*it)) {
DEBUG(dbgs() << "LV: Found an unidentified write ptr:"<< **it <<"\n");
NeedRTCheck = true;
AllWritesIdentified = false;
}
if (!WriteObjects.insert(*it)) {
DEBUG(dbgs() << "LV: Found a possible write-write reorder:"
@ -1726,7 +1728,9 @@ bool LoopVectorizationLegality::canVectorizeMemory() {
GetUnderlyingObjects(*I, TempObjects, DL);
for (ValueVector::iterator it=TempObjects.begin(), e=TempObjects.end();
it != e; ++it) {
if (!isIdentifiedObject(*it)) {
// If all of the writes are identified then we don't care if the read
// pointer is identified or not.
if (!AllWritesIdentified && !isIdentifiedObject(*it)) {
DEBUG(dbgs() << "LV: Found an unidentified read ptr:"<< **it <<"\n");
NeedRTCheck = true;
}