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Don't attempt aggressive post-inc uses if TargetLowering is not available,

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because profitability can't be sufficiently approximated.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96148 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-02-14 02:45:21 +00:00
parent ca1c816f25
commit 2763dfdc70
1 changed files with 8 additions and 3 deletions
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11
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -1503,7 +1503,11 @@ LSRInstance::OptimizeLoopTermCond() {
// Conservatively avoid trying to use the post-inc value in non-latch
// exits if there may be pre-inc users in intervening blocks.
if (LatchBlock != ExitingBlock)
if (LatchBlock != ExitingBlock) {
// Without target lowering, we won't be able to query about valid reuse.
if (!TLI)
continue;
for (IVUsers::const_iterator UI = IU.begin(), E = IU.end(); UI != E; ++UI)
// Test if the use is reachable from the exiting block. This dominator
// query is a conservative approximation of reachability.
@ -1535,13 +1539,14 @@ LSRInstance::OptimizeLoopTermCond() {
const Type *AccessTy = getAccessType(UI->getUser());
TargetLowering::AddrMode AM;
AM.Scale = D->getValue()->getSExtValue();
if (TLI && TLI->isLegalAddressingMode(AM, AccessTy))
if (TLI->isLegalAddressingMode(AM, AccessTy))
goto decline_post_inc;
AM.Scale = -AM.Scale;
if (TLI && TLI->isLegalAddressingMode(AM, AccessTy))
if (TLI->isLegalAddressingMode(AM, AccessTy))
goto decline_post_inc;
}
}
}
DEBUG(dbgs() << " Change loop exiting icmp to use postinc iv: "
<< *Cond << '\n');