[llvm] Remove Signum_match template and its implementation (PR #210629)

[via llvm-commits]

https://github.com/zip-stack-debug created https://github.com/llvm/llvm-project/pull/210629

Removed Signum_match template and associated matching logic from PatternMatch.h.

>From fe3dc61c185a8171459f4ba3da9630b7b5d8e148 Mon Sep 17 00:00:00 2001
From: zip-stack-debug <doremyalt at gmail.com>
Date: Sun, 19 Jul 2026 17:43:06 -0400
Subject: [PATCH] Remove Signum_match template and its implementation

Removed Signum_match template and associated matching logic from PatternMatch.h.
---
 llvm/include/llvm/IR/PatternMatch.h | 40 -----------------------------
 1 file changed, 40 deletions(-)

diff --git a/llvm/include/llvm/IR/PatternMatch.h b/llvm/include/llvm/IR/PatternMatch.h
index ca1dd7b46a6c4..586e6a3049a4c 100644
--- a/llvm/include/llvm/IR/PatternMatch.h
+++ b/llvm/include/llvm/IR/PatternMatch.h
@@ -3119,46 +3119,6 @@ m_c_FMul(const LHS &L, const RHS &R) {
   return BinaryOp_match<LHS, RHS, Instruction::FMul, true>(L, R);
 }
 
-template <typename Opnd_t> struct Signum_match {
-  Opnd_t Val;
-  Signum_match(const Opnd_t &V) : Val(V) {}
-
-  template <typename OpTy> bool match(OpTy *V) const {
-    unsigned TypeSize = V->getType()->getScalarSizeInBits();
-    if (TypeSize == 0)
-      return false;
-
-    unsigned ShiftWidth = TypeSize - 1;
-    Value *Op;
-
-    // This is the representation of signum we match:
-    //
-    //  signum(x) == (x >> 63) | (-x >>u 63)
-    //
-    // An i1 value is its own signum, so it's correct to match
-    //
-    //  signum(x) == (x >> 0)  | (-x >>u 0)
-    //
-    // for i1 values.
-
-    auto LHS = m_AShr(m_Value(Op), m_SpecificInt(ShiftWidth));
-    auto RHS = m_LShr(m_Neg(m_Deferred(Op)), m_SpecificInt(ShiftWidth));
-    auto Signum = m_c_Or(LHS, RHS);
-
-    return Signum.match(V) && Val.match(Op);
-  }
-};
-
-/// Matches a signum pattern.
-///
-/// signum(x) =
-///      x >  0  ->  1
-///      x == 0  ->  0
-///      x <  0  -> -1
-template <typename Val_t> inline Signum_match<Val_t> m_Signum(const Val_t &V) {
-  return Signum_match<Val_t>(V);
-}
-
 template <int Ind, typename Opnd_t> struct ExtractValue_match {
   Opnd_t Val;
   ExtractValue_match(const Opnd_t &V) : Val(V) {}