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-rw-r--r--lib/Transforms/Vectorize/LoopVectorize.cpp11
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');