[PATCH] D100763: [LoopVectorize] Don't create unnecessary vscale intrinsic calls

David Sherwood via Phabricator via llvm-commits llvm-commits at lists.llvm.org
Tue Apr 20 03:53:26 PDT 2021


david-arm updated this revision to Diff 338804.
david-arm added a comment.

- Reverted change to createStepForVF


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D100763/new/

https://reviews.llvm.org/D100763

Files:
  llvm/lib/IR/IRBuilder.cpp
  llvm/lib/Transforms/Vectorize/LoopVectorize.cpp


Index: llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
===================================================================
--- llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -4768,10 +4768,9 @@
              "Currently unsupported for scalable vectors");
       unsigned Lanes = IsUniform ? 1 : State.VF.getFixedValue();
 
-      Value *RuntimeVF = getRuntimeVF(Builder, PtrInd->getType(), VF);
       for (unsigned Part = 0; Part < UF; ++Part) {
-        Value *PartStart = Builder.CreateMul(
-            RuntimeVF, ConstantInt::get(PtrInd->getType(), Part));
+        Value *PartStart = createStepForVF(
+            Builder, ConstantInt::get(PtrInd->getType(), Part), VF);
         for (unsigned Lane = 0; Lane < Lanes; ++Lane) {
           Value *Idx = Builder.CreateAdd(
               PartStart, ConstantInt::get(PtrInd->getType(), Lane));
Index: llvm/lib/IR/IRBuilder.cpp
===================================================================
--- llvm/lib/IR/IRBuilder.cpp
+++ llvm/lib/IR/IRBuilder.cpp
@@ -81,8 +81,10 @@
 }
 
 Value *IRBuilderBase::CreateVScale(Constant *Scaling, const Twine &Name) {
-  Module *M = GetInsertBlock()->getParent()->getParent();
   assert(isa<ConstantInt>(Scaling) && "Expected constant integer");
+  if (cast<ConstantInt>(Scaling)->isZero())
+    return Scaling;
+  Module *M = GetInsertBlock()->getParent()->getParent();
   Function *TheFn =
       Intrinsic::getDeclaration(M, Intrinsic::vscale, {Scaling->getType()});
   CallInst *CI = createCallHelper(TheFn, {}, this, Name);


-------------- next part --------------
A non-text attachment was scrubbed...
Name: D100763.338804.patch
Type: text/x-patch
Size: 1575 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20210420/c41d70a6/attachment.bin>


More information about the llvm-commits mailing list