[llvm] VPlan/PatternMatch: introduce m_c_Mul (NFC) (PR #93950)

[Ramkumar Ramachandra via llvm-commits]

https://github.com/artagnon created https://github.com/llvm/llvm-project/pull/93950

Introduce a commutative version of m_Mul, and simplify a usage based on it.

>From cdec66c452350f9a2b70f48204debba630f9f8bc Mon Sep 17 00:00:00 2001
From: Ramkumar Ramachandra <r at artagnon.com>
Date: Fri, 31 May 2024 11:48:29 +0100
Subject: [PATCH] VPlan/PatternMatch: introduce m_c_Mul (NFC)

Introduce a commutative version of m_Mul, and simplify a usage based on
it.
---
 .../Transforms/Vectorize/VPlanPatternMatch.h  | 19 ++++++++++++-------
 .../Transforms/Vectorize/VPlanTransforms.cpp  |  3 +--
 2 files changed, 13 insertions(+), 9 deletions(-)

diff --git a/llvm/lib/Transforms/Vectorize/VPlanPatternMatch.h b/llvm/lib/Transforms/Vectorize/VPlanPatternMatch.h
index 0587468807435..499aea4c6b75a 100644
--- a/llvm/lib/Transforms/Vectorize/VPlanPatternMatch.h
+++ b/llvm/lib/Transforms/Vectorize/VPlanPatternMatch.h
@@ -268,10 +268,16 @@ m_Binary(const Op0_t &Op0, const Op1_t &Op1) {
   return AllBinaryRecipe_match<Op0_t, Op1_t, Opcode, Commutative>(Op0, Op1);
 }
 
-template <typename Op0_t, typename Op1_t>
-inline AllBinaryRecipe_match<Op0_t, Op1_t, Instruction::Mul>
+template <typename Op0_t, typename Op1_t, bool Commutative = false>
+inline AllBinaryRecipe_match<Op0_t, Op1_t, Instruction::Mul, Commutative>
 m_Mul(const Op0_t &Op0, const Op1_t &Op1) {
-  return m_Binary<Instruction::Mul, Op0_t, Op1_t>(Op0, Op1);
+  return m_Binary<Instruction::Mul, Op0_t, Op1_t, Commutative>(Op0, Op1);
+}
+
+template <typename Op0_t, typename Op1_t, bool Commutative = true>
+inline AllBinaryRecipe_match<Op0_t, Op1_t, Instruction::Mul, Commutative>
+m_c_Mul(const Op0_t &Op0, const Op1_t &Op1) {
+  return m_Binary<Instruction::Mul, Op0_t, Op1_t, Commutative>(Op0, Op1);
 }
 
 /// Match a binary OR operation. Note that while conceptually the operands can
@@ -284,11 +290,10 @@ m_BinaryOr(const Op0_t &Op0, const Op1_t &Op1) {
   return m_Binary<Instruction::Or, Op0_t, Op1_t, Commutative>(Op0, Op1);
 }
 
-template <typename Op0_t, typename Op1_t>
-inline AllBinaryRecipe_match<Op0_t, Op1_t, Instruction::Or,
-                             /*Commutative*/ true>
+template <typename Op0_t, typename Op1_t, bool Commutative = true>
+inline AllBinaryRecipe_match<Op0_t, Op1_t, Instruction::Or, Commutative>
 m_c_BinaryOr(const Op0_t &Op0, const Op1_t &Op1) {
-  return m_BinaryOr<Op0_t, Op1_t, /*Commutative*/ true>(Op0, Op1);
+  return m_BinaryOr<Op0_t, Op1_t, Commutative>(Op0, Op1);
 }
 
 template <typename Op0_t, typename Op1_t>
diff --git a/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp b/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
index 422579ea8b84f..c23187065101c 100644
--- a/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
+++ b/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
@@ -948,8 +948,7 @@ static void simplifyRecipe(VPRecipeBase &R, VPTypeAnalysis &TypeInfo) {
     return;
   }
 
-  if (match(&R, m_CombineOr(m_Mul(m_VPValue(A), m_SpecificInt(1)),
-                            m_Mul(m_SpecificInt(1), m_VPValue(A)))))
+  if (match(&R, m_c_Mul(m_VPValue(A), m_SpecificInt(1))))
     return R.getVPSingleValue()->replaceAllUsesWith(A);
 }