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author | Chandler Carruth <chandlerc@gmail.com> | 2014-01-27 11:41:50 +0000 |
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committer | Chandler Carruth <chandlerc@gmail.com> | 2014-01-27 11:41:50 +0000 |
commit | 1c4746ed70480791cedfbcd65d7d0645798d85f4 (patch) | |
tree | 5ba2f39051d3ceb20917c9d74e67d89b908ffb8d /lib/Transforms | |
parent | 91a3f1dc8ef69d17cdf81ea3e1214e6e7c127d83 (diff) | |
download | llvm-1c4746ed70480791cedfbcd65d7d0645798d85f4.tar.gz llvm-1c4746ed70480791cedfbcd65d7d0645798d85f4.tar.bz2 llvm-1c4746ed70480791cedfbcd65d7d0645798d85f4.tar.xz |
[vectorizer] Add an override for the target instruction cost and use it
to stabilize a test that really is trying to test generic behavior and
not a specific target's behavior.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200215 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms')
-rw-r--r-- | lib/Transforms/Vectorize/LoopVectorize.cpp | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/lib/Transforms/Vectorize/LoopVectorize.cpp b/lib/Transforms/Vectorize/LoopVectorize.cpp index 1ba0b77503..750fc40d26 100644 --- a/lib/Transforms/Vectorize/LoopVectorize.cpp +++ b/lib/Transforms/Vectorize/LoopVectorize.cpp @@ -160,6 +160,12 @@ static cl::opt<unsigned> ForceTargetMaxVectorUnrollFactor( cl::desc("A flag that overrides the target's max unroll factor for " "vectorized loops.")); +static cl::opt<unsigned> ForceTargetInstructionCost( + "force-target-instruction-cost", cl::init(0), cl::Hidden, + cl::desc("A flag that overrides the target's expected cost for " + "an instruction to a single constant value. Mostly " + "useful for getting consistent testing.")); + static cl::opt<unsigned> SmallLoopCost( "small-loop-cost", cl::init(20), cl::Hidden, cl::desc("The cost of a loop that is considered 'small' by the unroller.")); @@ -5185,6 +5191,11 @@ unsigned LoopVectorizationCostModel::expectedCost(unsigned VF) { continue; unsigned C = getInstructionCost(it, VF); + + // Check if we should override the cost. + if (ForceTargetInstructionCost.getNumOccurrences() > 0) + C = ForceTargetInstructionCost; + BlockCost += C; DEBUG(dbgs() << "LV: Found an estimated cost of " << C << " for VF " << VF << " For instruction: " << *it << '\n'); |