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Register Coalescing: add a flag to disable rescheduling.

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When MachineScheduler is enabled, this functionality can be
removed. Until then, provide a way to disable it for test cases and
designing MachineScheduler heuristics.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180192 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2013-04-24 15:54:39 +00:00
parent 811a372d4f
commit e2326ad2c0
1 changed files with 8 additions and 2 deletions
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10
lib/CodeGen/TwoAddressInstructionPass.cpp
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@ -43,6 +43,7 @@
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/IR/Function.h"
#include "llvm/MC/MCInstrItineraries.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Target/TargetInstrInfo.h"
@ -58,6 +59,11 @@ STATISTIC(Num3AddrSunk, "Number of 3-address instructions sunk");
STATISTIC(NumReSchedUps, "Number of instructions re-scheduled up");
STATISTIC(NumReSchedDowns, "Number of instructions re-scheduled down");
// Temporary flag to disable rescheduling.
static cl::opt<bool>
EnableRescheduling("twoaddr-reschedule",
cl::desc("Coalesce copies by rescheduling (default=true)"), cl::init(true), cl::Hidden);
namespace {
class TwoAddressInstructionPass : public MachineFunctionPass {
MachineFunction *MF;
@ -1144,7 +1150,7 @@ tryInstructionTransform(MachineBasicBlock::iterator &mi,
// If there is one more use of regB later in the same MBB, consider
// re-schedule this MI below it.
if (rescheduleMIBelowKill(mi, nmi, regB)) {
if (EnableRescheduling && rescheduleMIBelowKill(mi, nmi, regB)) {
++NumReSchedDowns;
return true;
}
@ -1163,7 +1169,7 @@ tryInstructionTransform(MachineBasicBlock::iterator &mi,
// If there is one more use of regB later in the same MBB, consider
// re-schedule it before this MI if it's legal.
if (rescheduleKillAboveMI(mi, nmi, regB)) {
if (EnableRescheduling && rescheduleKillAboveMI(mi, nmi, regB)) {
++NumReSchedUps;
return true;
}