diff options
| author | Chandler Carruth <chandlerc@gmail.com> | 2014-01-27 11:41:50 +0000 |
|---|---|---|
| committer | Chandler Carruth <chandlerc@gmail.com> | 2014-01-27 11:41:50 +0000 |
| commit | 1c4746ed70480791cedfbcd65d7d0645798d85f4 (patch) | |
| tree | 5ba2f39051d3ceb20917c9d74e67d89b908ffb8d | |
| parent | 91a3f1dc8ef69d17cdf81ea3e1214e6e7c127d83 (diff) | |
[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
| -rw-r--r-- | lib/Transforms/Vectorize/LoopVectorize.cpp | 11 | ||||
| -rw-r--r-- | test/Transforms/LoopVectorize/unroll_novec.ll | 2 |
2 files changed, 12 insertions, 1 deletions
diff --git a/lib/Transforms/Vectorize/LoopVectorize.cpp b/lib/Transforms/Vectorize/LoopVectorize.cpp index 1ba0b77503e..750fc40d261 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'); diff --git a/test/Transforms/LoopVectorize/unroll_novec.ll b/test/Transforms/LoopVectorize/unroll_novec.ll index be5bbb68e65..89f4678526d 100644 --- a/test/Transforms/LoopVectorize/unroll_novec.ll +++ b/test/Transforms/LoopVectorize/unroll_novec.ll @@ -1,4 +1,4 @@ -; RUN: opt < %s -loop-vectorize -force-vector-width=1 -force-target-num-scalar-regs=16 -force-target-max-scalar-unroll=8 -small-loop-cost=20 -dce -instcombine -S | FileCheck %s +; RUN: opt < %s -loop-vectorize -force-vector-width=1 -force-target-num-scalar-regs=16 -force-target-max-scalar-unroll=8 -force-target-instruction-cost=1 -small-loop-cost=40 -dce -instcombine -S | FileCheck %s target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128" target triple = "x86_64-apple-macosx10.8.0" |