#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetSubtargetInfo.h"
using namespace llvm;
#define DEBUG_TYPE "ppc-branch-select"
/// BlockSizes - The sizes of the basic blocks in the function.
std::vector<unsigned> BlockSizes;
- virtual bool runOnMachineFunction(MachineFunction &Fn);
+ bool runOnMachineFunction(MachineFunction &Fn) override;
- virtual const char *getPassName() const {
+ const char *getPassName() const override {
return "PowerPC Branch Selector";
}
};
bool PPCBSel::runOnMachineFunction(MachineFunction &Fn) {
const PPCInstrInfo *TII =
- static_cast<const PPCInstrInfo*>(Fn.getTarget().getInstrInfo());
+ static_cast<const PPCInstrInfo *>(Fn.getSubtarget().getInstrInfo());
// Give the blocks of the function a dense, in-order, numbering.
Fn.RenumberBlocks();
BlockSizes.resize(Fn.getNumBlockIDs());
+ auto GetAlignmentAdjustment =
+ [TII](MachineBasicBlock &MBB, unsigned Offset) -> unsigned {
+ unsigned Align = MBB.getAlignment();
+ if (!Align)
+ return 0;
+
+ unsigned AlignAmt = 1 << Align;
+ unsigned ParentAlign = MBB.getParent()->getAlignment();
+
+ if (Align <= ParentAlign)
+ return OffsetToAlignment(Offset, AlignAmt);
+
+ // The alignment of this MBB is larger than the function's alignment, so we
+ // can't tell whether or not it will insert nops. Assume that it will.
+ return AlignAmt + OffsetToAlignment(Offset, AlignAmt);
+ };
+
// Measure each MBB and compute a size for the entire function.
unsigned FuncSize = 0;
for (MachineFunction::iterator MFI = Fn.begin(), E = Fn.end(); MFI != E;
++MFI) {
- MachineBasicBlock *MBB = MFI;
+ MachineBasicBlock *MBB = &*MFI;
+
+ // The end of the previous block may have extra nops if this block has an
+ // alignment requirement.
+ if (MBB->getNumber() > 0) {
+ unsigned AlignExtra = GetAlignmentAdjustment(*MBB, FuncSize);
+ BlockSizes[MBB->getNumber()-1] += AlignExtra;
+ FuncSize += AlignExtra;
+ }
unsigned BlockSize = 0;
for (MachineBasicBlock::iterator MBBI = MBB->begin(), EE = MBB->end();
unsigned MBBStartOffset = 0;
for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end();
I != E; ++I) {
- MachineBasicBlock *Dest = 0;
+ MachineBasicBlock *Dest = nullptr;
if (I->getOpcode() == PPC::BCC && !I->getOperand(2).isImm())
Dest = I->getOperand(2).getMBB();
else if ((I->getOpcode() == PPC::BC || I->getOpcode() == PPC::BCn) &&