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[LoopUnrollRuntime] Avoid high-cost trip count computation.

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Summary:
Runtime unrolling of loops needs to emit an expression to compute the
loop's runtime trip-count.  Avoid runtime unrolling if this computation
will be expensive.

Depends on D8993.

Reviewers: atrick

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D8994

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234846 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sanjoy Das
2015-04-14 03:20:38 +00:00
parent 17e08f50b9
commit 888e8e3a66
8 changed files with 63 additions and 14 deletions
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5
lib/Transforms/Scalar/LoopUnrollPass.cpp
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@ -165,6 +165,7 @@ namespace {
UP.MaxCount = UINT_MAX;
UP.Partial = CurrentAllowPartial;
UP.Runtime = CurrentRuntime;
UP.AllowExpensiveTripCount = false;
TTI.getUnrollingPreferences(L, UP);
}
@ -886,8 +887,8 @@ bool LoopUnroll::runOnLoop(Loop *L, LPPassManager &LPM) {
}
// Unroll the loop.
if (!UnrollLoop(L, Count, TripCount, AllowRuntime, TripMultiple, LI, this,
&LPM, &AC))
if (!UnrollLoop(L, Count, TripCount, AllowRuntime, UP.AllowExpensiveTripCount,
TripMultiple, LI, this, &LPM, &AC))
return false;
return true;