From 9fec2431ce1490c45ba12052288c476e13a3606f Mon Sep 17 00:00:00 2001
From: Craig Topper <craig.topper@intel.com>
Date: Fri, 7 Jul 2017 19:56:23 +0000
Subject: [PATCH] [PatternMatch] Implemenet m_SignMask using
 Constant::isMinSignedValue instead of doing splat detection and analyzing the
 resulting APInt.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307433 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/IR/PatternMatch.h | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/include/llvm/IR/PatternMatch.h b/include/llvm/IR/PatternMatch.h
index 4b03063a6a9..acb89521164 100644
--- a/include/llvm/IR/PatternMatch.h
+++ b/include/llvm/IR/PatternMatch.h
@@ -204,6 +204,17 @@ struct match_all_ones {
 /// \brief Match an integer or vector with all bits set to true.
 inline match_all_ones m_AllOnes() { return match_all_ones(); }
 
+struct match_sign_mask {
+  template <typename ITy> bool match(ITy *V) {
+    if (const auto *C = dyn_cast<Constant>(V))
+      return C->isMinSignedValue();
+    return false;
+  }
+};
+
+/// \brief Match an integer or vector with only the sign bit(s) set.
+inline match_sign_mask m_SignMask() { return match_sign_mask(); }
+
 struct apint_match {
   const APInt *&Res;
 
@@ -287,16 +298,6 @@ template <typename Predicate> struct api_pred_ty : public Predicate {
   }
 };
 
-struct is_sign_mask {
-  bool isValue(const APInt &C) { return C.isSignMask(); }
-};
-
-/// \brief Match an integer or vector with only the sign bit(s) set.
-inline cst_pred_ty<is_sign_mask> m_SignMask() {
-  return cst_pred_ty<is_sign_mask>();
-}
-inline api_pred_ty<is_sign_mask> m_SignMask(const APInt *&V) { return V; }
-
 struct is_power2 {
   bool isValue(const APInt &C) { return C.isPowerOf2(); }
 };
-- 
2.49.0