[VPlan] Remove non-power-of-2 scalable VF comment. NFC

[lukel97]

No longer holds after #183080

[llvmbot]

@llvm/pr-subscribers-vectorizers

@llvm/pr-subscribers-llvm-transforms

Author: Luke Lau (lukel97)

Changes

No longer holds after #183080

---

Full diff: https://github.com/llvm/llvm-project/pull/183719.diff

1 Files Affected:

• (modified) llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp (-2)

diff --git a/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp b/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
index 758ee606503b3..4c393f2f6f05a 100644
--- a/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
+++ b/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
@@ -5031,8 +5031,6 @@ void VPlanTransforms::materializeVectorTripCount(VPlan &Plan,
   // overflows: the vector induction variable will eventually wrap to zero given
   // that it starts at zero and its Step is a power of two; the loop will then
   // exit, with the last early-exit vector comparison also producing all-true.
-  // For scalable vectors the VF is not guaranteed to be a power of 2, but this
-  // is accounted for in emitIterationCountCheck that adds an overflow check.
   if (TailByMasking) {
     TC = Builder.createAdd(
         TC, Builder.createSub(Step, Plan.getConstantInt(TCTy, 1)),

[fhahn]

LGTM, thanks