[llvm] [LV][EVL] Address post-comments for 9720be9. (NFC) (PR #123311)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-vectorizers

Author: Mel Chen (Mel-Chen)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/123311.diff


2 Files Affected:

- (modified) llvm/lib/Transforms/Vectorize/LoopVectorize.cpp (+3-3) 
- (modified) llvm/test/Transforms/LoopVectorize/RISCV/vectorize-force-tail-with-evl-fixed-order-recurrence.ll (+2-2) 


``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
index 8024cde41b5f95a..7e89f357cc90c8b 100644
--- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -1447,11 +1447,11 @@ class LoopVectorizationCostModel {
     // Override forced styles if needed.
     // FIXME: use actual opcode/data type for analysis here.
     // FIXME: Investigate opportunity for fixed vector factor.
+    // FIXME: support fixed-order recurrences by fixing splice of non VFxUF
+    // penultimate EVL.
     bool EVLIsLegal =
         UserIC <= 1 && TTI.hasActiveVectorLength(0, nullptr, Align()) &&
-        !EnableVPlanNativePath &&
-        // FIXME: remove this once fixed-ordered recurrence is supported.
-        Legal->getFixedOrderRecurrences().empty();
+        !EnableVPlanNativePath && Legal->getFixedOrderRecurrences().empty();
     if (!EVLIsLegal) {
       // If for some reason EVL mode is unsupported, fallback to
       // DataWithoutLaneMask to try to vectorize the loop with folded tail
diff --git a/llvm/test/Transforms/LoopVectorize/RISCV/vectorize-force-tail-with-evl-fixed-order-recurrence.ll b/llvm/test/Transforms/LoopVectorize/RISCV/vectorize-force-tail-with-evl-fixed-order-recurrence.ll
index 809b69900731acf..3e6588befaec595 100644
--- a/llvm/test/Transforms/LoopVectorize/RISCV/vectorize-force-tail-with-evl-fixed-order-recurrence.ll
+++ b/llvm/test/Transforms/LoopVectorize/RISCV/vectorize-force-tail-with-evl-fixed-order-recurrence.ll
@@ -12,8 +12,8 @@
 ; RUN: -mtriple=riscv64 -mattr=+v,+f -S < %s| FileCheck %s --check-prefix=NO-VP
 
 ; FIXME: Fixed-order recurrence is not supported yet with EVL tail folding.
-; The llvm.splice may occurs unexpected behavior if the evl of the
-; second-to-last iteration is not VF*UF.
+; The llvm.splice may occur unexpected behavior if the evl of the second-to-last
+; iteration is not VF*UF.
 
 define void @first_order_recurrence(ptr noalias %A, ptr noalias %B, i64 %TC) {
 ; IF-EVL-LABEL: define void @first_order_recurrence(

``````````

</details>


https://github.com/llvm/llvm-project/pull/123311