[llvm-commits] [llvm] r106347 - in /llvm/trunk/lib/Target/ARM: Thumb2HazardRecognizer.cpp Thumb2HazardRecognizer.h

[Evan Cheng]

Author: evancheng
Date: Fri Jun 18 18:11:35 2010
New Revision: 106347

URL: http://llvm.org/viewvc/llvm-project?rev=106347&view=rev
Log:
Thumb2 hazard recognizer.

Added:
    llvm/trunk/lib/Target/ARM/Thumb2HazardRecognizer.cpp
    llvm/trunk/lib/Target/ARM/Thumb2HazardRecognizer.h

Added: llvm/trunk/lib/Target/ARM/Thumb2HazardRecognizer.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/Thumb2HazardRecognizer.cpp?rev=106347&view=auto
==============================================================================
--- llvm/trunk/lib/Target/ARM/Thumb2HazardRecognizer.cpp (added)
+++ llvm/trunk/lib/Target/ARM/Thumb2HazardRecognizer.cpp Fri Jun 18 18:11:35 2010
@@ -0,0 +1,50 @@
+//===-- Thumb2HazardRecognizer.cpp - Thumb2 postra hazard recognizer ------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "ARM.h"
+#include "Thumb2HazardRecognizer.h"
+#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/CodeGen/ScheduleDAG.h"
+using namespace llvm;
+
+ScheduleHazardRecognizer::HazardType
+Thumb2HazardRecognizer::getHazardType(SUnit *SU) {
+  if (ITBlockSize) {
+    MachineInstr *MI = SU->getInstr();
+    if (MI != ITBlockMIs[ITBlockSize-1])
+      return Hazard;
+  }
+
+  return PostRAHazardRecognizer::getHazardType(SU);
+}
+
+void Thumb2HazardRecognizer::Reset() {
+  ITBlockSize = 0;
+  PostRAHazardRecognizer::Reset();
+}
+
+void Thumb2HazardRecognizer::EmitInstruction(SUnit *SU) {
+  MachineInstr *MI = SU->getInstr();
+  unsigned Opcode = MI->getOpcode();
+  if (ITBlockSize) {
+    --ITBlockSize;
+  } else if (Opcode == ARM::t2IT) {
+    unsigned Mask = MI->getOperand(1).getImm();
+    unsigned NumTZ = CountTrailingZeros_32(Mask);
+    assert(NumTZ <= 3 && "Invalid IT mask!");
+    ITBlockSize = 4 - NumTZ;
+    MachineBasicBlock::iterator I = MI;
+    for (unsigned i = 0; i < ITBlockSize; ++i) {
+      ++I;
+      ITBlockMIs[ITBlockSize-1-i] = &*I;
+    }
+  }
+
+  PostRAHazardRecognizer::EmitInstruction(SU);
+}

Added: llvm/trunk/lib/Target/ARM/Thumb2HazardRecognizer.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/Thumb2HazardRecognizer.h?rev=106347&view=auto
==============================================================================
--- llvm/trunk/lib/Target/ARM/Thumb2HazardRecognizer.h (added)
+++ llvm/trunk/lib/Target/ARM/Thumb2HazardRecognizer.h Fri Jun 18 18:11:35 2010
@@ -0,0 +1,40 @@
+//===-- Thumb2HazardRecognizer.h - Thumb2 Hazard Recognizers ----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines hazard recognizers for scheduling Thumb2 functions on
+// ARM processors.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef THUMB2HAZARDRECOGNIZER_H
+#define THUMB2HAZARDRECOGNIZER_H
+
+#include "llvm/CodeGen/PostRAHazardRecognizer.h"
+
+namespace llvm {
+
+class MachineInstr;
+
+class Thumb2HazardRecognizer : public PostRAHazardRecognizer {
+  unsigned ITBlockSize;  // No. of MIs in current IT block yet to be scheduled.
+  MachineInstr *ITBlockMIs[4];
+
+public:
+  Thumb2HazardRecognizer(const InstrItineraryData &ItinData) :
+    PostRAHazardRecognizer(ItinData) {}
+
+  virtual HazardType getHazardType(SUnit *SU);
+  virtual void Reset();
+  virtual void EmitInstruction(SUnit *SU);
+};
+
+
+} // end namespace llvm
+
+#endif // THUMB2HAZARDRECOGNIZER_H