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Do not split loops rejected by processOneIterationLoop().

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llvm-svn: 41194
This commit is contained in:
Devang Patel 2007-08-20 20:24:15 +00:00
parent 6b3b5e7a54
commit 6c91023dad
3 changed files with 13 additions and 9 deletions
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16
lib/Transforms/Scalar/LoopIndexSplit.cpp
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@ -178,7 +178,7 @@ bool LoopIndexSplit::runOnLoop(Loop *IncomingLoop, LPPassManager &LPM_Ref) {
// First see if it is possible to eliminate loop itself or not.
for (SmallVector<SplitInfo, 4>::iterator SI = SplitData.begin(),
E = SplitData.end(); SI != E; ++SI) {
E = SplitData.end(); SI != E;) {
SplitInfo &SD = *SI;
if (SD.SplitCondition->getPredicate() == ICmpInst::ICMP_EQ) {
Changed = processOneIterationLoop(SD);
@ -186,8 +186,13 @@ bool LoopIndexSplit::runOnLoop(Loop *IncomingLoop, LPPassManager &LPM_Ref) {
++NumIndexSplit;
// If is loop is eliminated then nothing else to do here.
return Changed;
} else {
SmallVector<SplitInfo, 4>::iterator Delete_SI = SI;
++SI;
SplitData.erase(Delete_SI);
}
}
} else
++SI;
}
unsigned MaxCost = 99;
@ -198,8 +203,8 @@ bool LoopIndexSplit::runOnLoop(Loop *IncomingLoop, LPPassManager &LPM_Ref) {
SplitInfo SD = *SI;
// ICM_EQs are already handled above.
if (SD.SplitCondition->getPredicate() == ICmpInst::ICMP_EQ)
continue;
assert (SD.SplitCondition->getPredicate() != ICmpInst::ICMP_EQ &&
"Unexpected split condition predicate");
unsigned Cost = findSplitCost(L, SD);
if (Cost < MaxCost)
@ -207,7 +212,8 @@ bool LoopIndexSplit::runOnLoop(Loop *IncomingLoop, LPPassManager &LPM_Ref) {
}
// Split most profitiable condition.
Changed = splitLoop(SplitData[MostProfitableSDIndex]);
if (!SplitData.empty())
Changed = splitLoop(SplitData[MostProfitableSDIndex]);
if (Changed)
++NumIndexSplit;

3
test/Transforms/LoopIndexSplit/Crash-2007-08-17.ll
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@ -1,5 +1,4 @@
; RUN: llvm-as < %s | opt -loop-index-split -disable-output -stats |& \
; RUN: grep "loop-index-split" | count 1
; RUN: llvm-as < %s | opt -loop-index-split -disable-output
%struct._edit_script = type { %struct._edit_script*, i32, i8 }

3
test/Transforms/LoopIndexSplit/Crash2-2007-08-17.ll
View File

@ -1,5 +1,4 @@
; RUN: llvm-as < %s | opt -loop-index-split -disable-output -stats |& \
; RUN: grep "loop-index-split" | count 1
; RUN: llvm-as < %s | opt -loop-index-split -disable-output
%struct._edit_script = type { %struct._edit_script*, i32, i8 }