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Avoid a confusing assert for silly options: -unroll-runtime -unroll-count=1.

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No need for an explicit test case for an unsupported combination of options.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146721 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2011-12-16 02:03:48 +00:00
parent 478a4d997a
commit 1da282764a
1 changed files with 5 additions and 0 deletions
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5
lib/Transforms/Utils/LoopUnroll.cpp
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@ -176,6 +176,11 @@ bool llvm::UnrollLoop(Loop *L, unsigned Count, unsigned TripCount,
if (TripCount != 0 && Count > TripCount) if (TripCount != 0 && Count > TripCount)
Count = TripCount; Count = TripCount;
// Don't enter the unroll code if there is nothing to do. This way we don't
// need to support "partial unrolling by 1".
if (TripCount == 0 && Count < 2)
return false;
assert(Count > 0); assert(Count > 0);
assert(TripMultiple > 0); assert(TripMultiple > 0);
assert(TripCount == 0 || TripCount % TripMultiple == 0); assert(TripCount == 0 || TripCount % TripMultiple == 0);