From 71d5a2540a98c81f5bcaeb48805e0e2881f530ef Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Sun, 16 Apr 2017 16:01:22 +0000
Subject: Vendor import of llvm trunk r300422:
 https://llvm.org/svn/llvm-project/llvm/trunk@300422

---
 lib/CodeGen/TargetSubtargetInfo.cpp | 46 +++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

(limited to 'lib/CodeGen/TargetSubtargetInfo.cpp')

diff --git a/lib/CodeGen/TargetSubtargetInfo.cpp b/lib/CodeGen/TargetSubtargetInfo.cpp
index c74707d95b9e..0a444e0fff07 100644
--- a/lib/CodeGen/TargetSubtargetInfo.cpp
+++ b/lib/CodeGen/TargetSubtargetInfo.cpp
@@ -11,6 +11,9 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/CodeGen/TargetSchedule.h"
+#include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetSubtargetInfo.h"
 using namespace llvm;
 
@@ -52,3 +55,46 @@ bool TargetSubtargetInfo::enablePostRAScheduler() const {
 bool TargetSubtargetInfo::useAA() const {
   return false;
 }
+
+static std::string createSchedInfoStr(unsigned Latency,
+                                     Optional<double> RThroughput) {
+  static const char *SchedPrefix = " sched: [";
+  std::string Comment;
+  raw_string_ostream CS(Comment);
+  if (Latency > 0 && RThroughput.hasValue())
+    CS << SchedPrefix << Latency << format(":%2.2f", RThroughput.getValue())
+       << "]";
+  else if (Latency > 0)
+    CS << SchedPrefix << Latency << ":?]";
+  else if (RThroughput.hasValue())
+    CS << SchedPrefix << "?:" << RThroughput.getValue() << "]";
+  CS.flush();
+  return Comment;
+}
+
+/// Returns string representation of scheduler comment
+std::string TargetSubtargetInfo::getSchedInfoStr(const MachineInstr &MI) const {
+  if (MI.isPseudo() || MI.isTerminator())
+    return std::string();
+  // We don't cache TSchedModel because it depends on TargetInstrInfo
+  // that could be changed during the compilation
+  TargetSchedModel TSchedModel;
+  TSchedModel.init(getSchedModel(), this, getInstrInfo());
+  unsigned Latency = TSchedModel.computeInstrLatency(&MI);
+  Optional<double> RThroughput = TSchedModel.computeInstrRThroughput(&MI);
+  return createSchedInfoStr(Latency, RThroughput);
+}
+
+/// Returns string representation of scheduler comment
+std::string TargetSubtargetInfo::getSchedInfoStr(MCInst const &MCI) const {
+  // We don't cache TSchedModel because it depends on TargetInstrInfo
+  // that could be changed during the compilation
+  TargetSchedModel TSchedModel;
+  TSchedModel.init(getSchedModel(), this, getInstrInfo());
+  if (!TSchedModel.hasInstrSchedModel())
+    return std::string();
+  unsigned Latency = TSchedModel.computeInstrLatency(MCI.getOpcode());
+  Optional<double> RThroughput =
+      TSchedModel.computeInstrRThroughput(MCI.getOpcode());
+  return createSchedInfoStr(Latency, RThroughput);
+}
-- 
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