This patch closes PR#32216: Better testing of schedule model instruction latencies/throughputs.

The details are here: https://reviews.llvm.org/D30941

llvm-svn: 300311

1 files changed, 46 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/TargetSubtargetInfo.cpp b/llvm/lib/CodeGen/TargetSubtargetInfo.cpp
index c74707d95b9..0a444e0fff0 100644
--- a/llvm/lib/CodeGen/TargetSubtargetInfo.cpp
+++ b/llvm/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);
+}