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Actually, this code doesn't have to be quite so conservative in

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the no-TLI case. But it should still default to declining the
transformation.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96152 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-02-14 03:21:49 +00:00
parent 1d826a76f5
commit 590bfe8641
1 changed files with 5 additions and 6 deletions
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11
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -1503,11 +1503,7 @@ 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) {
// Without target lowering, we won't be able to query about valid reuse.
if (!TLI)
continue;
if (LatchBlock != ExitingBlock)
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.
@ -1535,6 +1531,10 @@ LSRInstance::OptimizeLoopTermCond() {
if (D->getValue()->getValue().getMinSignedBits() >= 64 ||
D->getValue()->getValue().isMinSignedValue())
goto decline_post_inc;
// Without TLI, assume that any stride might be valid, and so any
// use might be shared.
if (!TLI)
goto decline_post_inc;
// Check for possible scaled-address reuse.
const Type *AccessTy = getAccessType(UI->getUser());
TargetLowering::AddrMode AM;
@ -1546,7 +1546,6 @@ LSRInstance::OptimizeLoopTermCond() {
goto decline_post_inc;
}
}
}
DEBUG(dbgs() << " Change loop exiting icmp to use postinc iv: "
<< *Cond << '\n');