mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-25 12:12:47 +01:00
92 lines
3.0 KiB
C++
92 lines
3.0 KiB
C++
//=====-- SPUFrameLowering.h - SPU Frame Lowering stuff -*- C++ -*----========//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file contains CellSPU frame information that doesn't fit anywhere else
|
|
// cleanly...
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef SPU_FRAMEINFO_H
|
|
#define SPU_FRAMEINFO_H
|
|
|
|
#include "SPURegisterInfo.h"
|
|
#include "llvm/Target/TargetFrameLowering.h"
|
|
#include "llvm/Target/TargetMachine.h"
|
|
|
|
namespace llvm {
|
|
class SPUSubtarget;
|
|
|
|
class SPUFrameLowering: public TargetFrameLowering {
|
|
const SPUSubtarget &Subtarget;
|
|
std::pair<unsigned, int> LR[1];
|
|
|
|
public:
|
|
SPUFrameLowering(const SPUSubtarget &sti);
|
|
|
|
//! Determine the frame's layour
|
|
void determineFrameLayout(MachineFunction &MF) const;
|
|
|
|
/// emitProlog/emitEpilog - These methods insert prolog and epilog code into
|
|
/// the function.
|
|
void emitPrologue(MachineFunction &MF) const;
|
|
void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
|
|
|
|
//! Prediate: Target has dedicated frame pointer
|
|
bool hasFP(const MachineFunction &MF) const;
|
|
|
|
void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
|
|
RegScavenger *RS = NULL) const;
|
|
|
|
//! Return a function's saved spill slots
|
|
/*!
|
|
For CellSPU, a function's saved spill slots is just the link register.
|
|
*/
|
|
const std::pair<unsigned, int> *
|
|
getCalleeSaveSpillSlots(unsigned &NumEntries) const;
|
|
|
|
//! Stack slot size (16 bytes)
|
|
static int stackSlotSize() {
|
|
return 16;
|
|
}
|
|
//! Maximum frame offset representable by a signed 10-bit integer
|
|
/*!
|
|
This is the maximum frame offset that can be expressed as a 10-bit
|
|
integer, used in D-form addresses.
|
|
*/
|
|
static int maxFrameOffset() {
|
|
return ((1 << 9) - 1) * stackSlotSize();
|
|
}
|
|
//! Minimum frame offset representable by a signed 10-bit integer
|
|
static int minFrameOffset() {
|
|
return -(1 << 9) * stackSlotSize();
|
|
}
|
|
//! Minimum frame size (enough to spill LR + SP)
|
|
static int minStackSize() {
|
|
return (2 * stackSlotSize());
|
|
}
|
|
//! Convert frame index to stack offset
|
|
static int FItoStackOffset(int frame_index) {
|
|
return frame_index * stackSlotSize();
|
|
}
|
|
//! Number of instructions required to overcome hint-for-branch latency
|
|
/*!
|
|
HBR (hint-for-branch) instructions can be inserted when, for example,
|
|
we know that a given function is going to be called, such as printf(),
|
|
in the control flow graph. HBRs are only inserted if a sufficient number
|
|
of instructions occurs between the HBR and the target. Currently, HBRs
|
|
take 6 cycles, ergo, the magic number 6.
|
|
*/
|
|
static int branchHintPenalty() {
|
|
return 6;
|
|
}
|
|
};
|
|
}
|
|
|
|
#endif
|