vendor/llvm/llvm-trunk-r366426

1 files changed, 19 insertions, 4 deletions

diff --git a/lib/MC/MCSchedule.cpp b/lib/MC/MCSchedule.cpp
index 929bd7f6046c..1fc5ec5e975f 100644
--- a/lib/MC/MCSchedule.cpp
+++ b/lib/MC/MCSchedule.cpp
@@ -1,9 +1,8 @@
 //===- MCSchedule.cpp - Scheduling ------------------------------*- C++ -*-===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
@@ -150,3 +149,19 @@ MCSchedModel::getReciprocalThroughput(unsigned SchedClass,
   // that it can execute at the maximum default issue width.
   return 1.0 / DefaultIssueWidth;
 }
+
+unsigned
+MCSchedModel::getForwardingDelayCycles(ArrayRef<MCReadAdvanceEntry> Entries,
+                                       unsigned WriteResourceID) {
+  if (Entries.empty())
+    return 0;
+
+  int DelayCycles = 0;
+  for (const MCReadAdvanceEntry &E : Entries) {
+    if (E.WriteResourceID != WriteResourceID)
+      continue;
+    DelayCycles = std::min(DelayCycles, E.Cycles);
+  }
+
+  return std::abs(DelayCycles);
+}