It's not necessary to do rounding for alloca operations when the requested
alignment is equal to the stack alignment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/PostRASchedulerList.cpp b/lib/CodeGen/PostRASchedulerList.cpp
new file mode 100644
index 0000000..06f47c7
--- /dev/null
+++ b/lib/CodeGen/PostRASchedulerList.cpp
@@ -0,0 +1,81 @@
+//===----- SchedulePostRAList.cpp - list scheduler ------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by Dale Johannesen and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This implements a top-down list scheduler, using standard algorithms.
+// The basic approach uses a priority queue of available nodes to schedule.
+// One at a time, nodes are taken from the priority queue (thus in priority
+// order), checked for legality to schedule, and emitted if legal.
+//
+// Nodes may not be legal to schedule either due to structural hazards (e.g.
+// pipeline or resource constraints) or because an input to the instruction has
+// not completed execution.
+//
+//===----------------------------------------------------------------------===//
+
+#define DEBUG_TYPE "post-RA-sched"
+#include "llvm/CodeGen/Passes.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/Support/Debug.h"
+//#include "llvm/ADT/Statistic.h"
+//#include <climits>
+//#include <queue>
+#include "llvm/Support/CommandLine.h"
+using namespace llvm;
+
+namespace {
+ bool NoPostRAScheduling;
+
+ // When this works it will be on by default.
+ cl::opt<bool, true>
+ DisablePostRAScheduler("disable-post-RA-scheduler",
+ cl::desc("Disable scheduling after register allocation"),
+ cl::location(NoPostRAScheduling),
+ cl::init(true));
+
+ class VISIBILITY_HIDDEN SchedulePostRATDList : public MachineFunctionPass {
+ public:
+ static char ID;
+ SchedulePostRATDList() : MachineFunctionPass((intptr_t)&ID) {}
+ private:
+ MachineFunction *MF;
+ const TargetMachine *TM;
+ public:
+ const char *getPassName() const {
+ return "Post RA top-down list latency scheduler (STUB)";
+ }
+
+ bool runOnMachineFunction(MachineFunction &Fn);
+ };
+ char SchedulePostRATDList::ID = 0;
+}
+
+bool SchedulePostRATDList::runOnMachineFunction(MachineFunction &Fn) {
+ if (NoPostRAScheduling)
+ return true;
+
+ DOUT << "SchedulePostRATDList\n";
+ MF = &Fn;
+ TM = &MF->getTarget();
+
+ // Loop over all of the basic blocks
+ for (MachineFunction::iterator MBB = Fn.begin(), MBBe = Fn.end();
+ MBB != MBBe; ++MBB)
+ ;
+
+ return true;
+}
+
+
+//===----------------------------------------------------------------------===//
+// Public Constructor Functions
+//===----------------------------------------------------------------------===//
+
+FunctionPass *llvm::createPostRAScheduler() {
+ return new SchedulePostRATDList();
+}