/// the GCC-style builtin setjmp/longjmp (sjlj) to handling EH control flow.
FunctionPass *createSjLjEHPass(const TargetLowering *tli);
- /// createMaxStackAlignmentCalculatorPass() - Determine the maximum required
- /// alignment for a function.
- FunctionPass* createMaxStackAlignmentCalculatorPass();
-
} // End llvm namespace
#endif
+++ /dev/null
-//===-- MaxStackAlignment.cpp - Compute the required stack alignment -- ---===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This pass looks for vector register usage and aligned local objects to
-// calculate the maximum required alignment for a function. This is used by
-// targets which support it to determine if dynamic stack realignment is
-// necessary.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/CodeGen/MachineFunction.h"
-#include "llvm/CodeGen/MachineFrameInfo.h"
-#include "llvm/CodeGen/MachineRegisterInfo.h"
-#include "llvm/CodeGen/Passes.h"
-
-using namespace llvm;
-
-namespace {
- struct MaximalStackAlignmentCalculator : public MachineFunctionPass {
- static char ID;
- MaximalStackAlignmentCalculator() : MachineFunctionPass(&ID) {}
-
- virtual bool runOnMachineFunction(MachineFunction &MF) {
- MachineFrameInfo *FFI = MF.getFrameInfo();
- MachineRegisterInfo &RI = MF.getRegInfo();
-
- // Calculate max stack alignment of all already allocated stack objects.
- FFI->calculateMaxStackAlignment();
- unsigned MaxAlign = FFI->getMaxAlignment();
-
- // Be over-conservative: scan over all vreg defs and find whether vector
- // registers are used. If yes, there is probability that vector registers
- // will be spilled and thus the stack needs to be aligned properly.
- // FIXME: It would be better to only do this if a spill actually
- // happens rather than conseratively aligning the stack regardless.
- for (unsigned RegNum = TargetRegisterInfo::FirstVirtualRegister;
- RegNum < RI.getLastVirtReg(); ++RegNum)
- MaxAlign = std::max(MaxAlign, RI.getRegClass(RegNum)->getAlignment());
-
- if (FFI->getMaxAlignment() == MaxAlign)
- return false;
-
- FFI->setMaxAlignment(MaxAlign);
- return true;
- }
-
- virtual const char *getPassName() const {
- return "Stack Alignment Requirements Auto-Detector";
- }
-
- virtual void getAnalysisUsage(AnalysisUsage &AU) const {
- AU.setPreservesCFG();
- MachineFunctionPass::getAnalysisUsage(AU);
- }
- };
-
- char MaximalStackAlignmentCalculator::ID = 0;
-}
-
-FunctionPass*
-llvm::createMaxStackAlignmentCalculatorPass() {
- return new MaximalStackAlignmentCalculator();
-}
-
RC == ARM::QPR_VFP2RegisterClass) && "Unknown regclass!");
// FIXME: Neon instructions should support predicates
if (Align >= 16
- && (getRegisterInfo().needsStackRealignment(MF))) {
+ && (getRegisterInfo().canRealignStack(MF))) {
AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VST1q64))
.addFrameIndex(FI).addImm(0).addImm(0).addImm(128)
.addMemOperand(MMO)
RC == ARM::QPR_VFP2RegisterClass ||
RC == ARM::QPR_8RegisterClass) && "Unknown regclass!");
if (Align >= 16
- && (getRegisterInfo().needsStackRealignment(MF))) {
+ && (getRegisterInfo().canRealignStack(MF))) {
AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VLD1q64), DestReg)
.addFrameIndex(FI).addImm(0).addImm(0).addImm(128)
.addMemOperand(MMO));
MFI->isFrameAddressTaken());
}
+bool ARMBaseRegisterInfo::canRealignStack(const MachineFunction &MF) const {
+ const MachineFrameInfo *MFI = MF.getFrameInfo();
+ const ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
+ return (RealignStack &&
+ !AFI->isThumb1OnlyFunction() &&
+ !MFI->hasVarSizedObjects());
+}
+
bool ARMBaseRegisterInfo::
needsStackRealignment(const MachineFunction &MF) const {
const MachineFrameInfo *MFI = MF.getFrameInfo();
bool hasFP(const MachineFunction &MF) const;
+ bool canRealignStack(const MachineFunction &MF) const;
bool needsStackRealignment(const MachineFunction &MF) const;
bool cannotEliminateFrame(const MachineFunction &MF) const;
if (Subtarget.hasNEON())
PM.add(createNEONPreAllocPass());
- // Calculate and set max stack object alignment early, so we can decide
- // whether we will need stack realignment (and thus FP).
- PM.add(createMaxStackAlignmentCalculatorPass());
-
// FIXME: temporarily disabling load / store optimization pass for Thumb1.
if (OptLevel != CodeGenOpt::None && !Subtarget.isThumb1Only())
PM.add(createARMLoadStoreOptimizationPass(true));
unsigned SrcReg, bool isKill, int FrameIdx,
const TargetRegisterClass *RC) const {
const MachineFunction &MF = *MBB.getParent();
- bool isAligned = (RI.getStackAlignment() >= 16) ||
- RI.needsStackRealignment(MF);
+ bool isAligned = (RI.getStackAlignment() >= 16) || RI.canRealignStack(MF);
unsigned Opc = getStoreRegOpcode(SrcReg, RC, isAligned, TM);
DebugLoc DL = DebugLoc::getUnknownLoc();
if (MI != MBB.end()) DL = MI->getDebugLoc();
unsigned DestReg, int FrameIdx,
const TargetRegisterClass *RC) const{
const MachineFunction &MF = *MBB.getParent();
- bool isAligned = (RI.getStackAlignment() >= 16) ||
- RI.needsStackRealignment(MF);
+ bool isAligned = (RI.getStackAlignment() >= 16) || RI.canRealignStack(MF);
unsigned Opc = getLoadRegOpcode(DestReg, RC, isAligned, TM);
DebugLoc DL = DebugLoc::getUnknownLoc();
if (MI != MBB.end()) DL = MI->getDebugLoc();
(MMI && MMI->callsUnwindInit()));
}
+bool X86RegisterInfo::canRealignStack(const MachineFunction &MF) const {
+ const MachineFrameInfo *MFI = MF.getFrameInfo();
+ return (RealignStack &&
+ !MFI->hasVarSizedObjects());
+}
+
bool X86RegisterInfo::needsStackRealignment(const MachineFunction &MF) const {
const MachineFrameInfo *MFI = MF.getFrameInfo();
bool requiresRealignment =
bool hasFP(const MachineFunction &MF) const;
+ bool canRealignStack(const MachineFunction &MF) const;
+
bool needsStackRealignment(const MachineFunction &MF) const;
bool hasReservedCallFrame(MachineFunction &MF) const;
bool X86TargetMachine::addPreRegAlloc(PassManagerBase &PM,
CodeGenOpt::Level OptLevel) {
- // Calculate and set max stack object alignment early, so we can decide
- // whether we will need stack realignment (and thus FP).
- PM.add(createMaxStackAlignmentCalculatorPass());
return false; // -print-machineinstr shouldn't print after this.
}