[PATCH] D152253: [LV] Add option to tune the cost model, NFC

Allen zhong via Phabricator via llvm-commits llvm-commits at lists.llvm.org
Tue Jun 6 03:14:01 PDT 2023

Allen created this revision.
Allen added reviewers: david-arm, dmgreen.
Herald added subscribers: ctetreau, hiraditya.
Herald added a project: All.
Allen requested review of this revision.
Herald added subscribers: llvm-commits, pcwang-thead.
Herald added a project: LLVM.

For Neon, the default nonconst stride cost is conservative,
and it is a local variable, which is not convenience to
to tune the loop vectorize.
So I try to use a option, which is similar to SVEGatherOverhead brought in D115143 <https://reviews.llvm.org/D115143>.



Index: llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
--- llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
+++ llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
@@ -42,6 +42,10 @@
 static cl::opt<unsigned> SVETailFoldInsnThreshold("sve-tail-folding-insn-threshold",
                                                   cl::init(15), cl::Hidden);
+static cl::opt<unsigned>
+    NeonNonConstStrideOverhead("neon-nonconst-stride-overhead", cl::init(10),
+                               cl::Hidden);
 namespace {
 class TailFoldingOption {
   // These bitfields will only ever be set to something non-zero in operator=,
@@ -2576,7 +2580,7 @@
   // likely result in more instructions compared to scalar code where the
   // computation can more often be merged into the index mode. The resulting
   // extra micro-ops can significantly decrease throughput.
-  unsigned NumVectorInstToHideOverhead = 10;
+  unsigned NumVectorInstToHideOverhead = NeonNonConstStrideOverhead;
   int MaxMergeDistance = 64;
   if (Ty->isVectorTy() && SE &&

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