[llvm] [VPlan] Add ExplicitVectorLength to isSingleScalar (PR #106818)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-transforms

Author: Michael Maitland (michaelmaitland)

<details>
<summary>Changes</summary>

The docstring of this function:

> Returns true if this VPInstruction's operands are single scalars and the
> result is also a single scalar.

ExplicitVectorLength fits this description. I don't have a test for it now, but it is needed by #<!-- -->106560.

---
Full diff: https://github.com/llvm/llvm-project/pull/106818.diff


1 Files Affected:

- (modified) llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp (+2-1) 


``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp b/llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp
index f84317ba51257a..5877aae81a7955 100644
--- a/llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp
+++ b/llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp
@@ -680,7 +680,8 @@ bool VPInstruction::isVectorToScalar() const {
 }
 
 bool VPInstruction::isSingleScalar() const {
-  return getOpcode() == VPInstruction::ResumePhi;
+  return getOpcode() == VPInstruction::ResumePhi ||
+         getOpcode() == VPInstruction::ExplicitVectorLength;
 }
 
 #if !defined(NDEBUG)

``````````

</details>


https://github.com/llvm/llvm-project/pull/106818