46 lines
1.7 KiB
C++
46 lines
1.7 KiB
C++
//===----------------------- R600FrameLowering.cpp ------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//==-----------------------------------------------------------------------===//
|
|
|
|
#include "R600FrameLowering.h"
|
|
#include "R600Subtarget.h"
|
|
|
|
using namespace llvm;
|
|
|
|
R600FrameLowering::~R600FrameLowering() = default;
|
|
|
|
/// \returns The number of registers allocated for \p FI.
|
|
StackOffset
|
|
R600FrameLowering::getFrameIndexReference(const MachineFunction &MF, int FI,
|
|
Register &FrameReg) const {
|
|
const MachineFrameInfo &MFI = MF.getFrameInfo();
|
|
const R600RegisterInfo *RI
|
|
= MF.getSubtarget<R600Subtarget>().getRegisterInfo();
|
|
|
|
// Fill in FrameReg output argument.
|
|
FrameReg = RI->getFrameRegister(MF);
|
|
|
|
// Start the offset at 2 so we don't overwrite work group information.
|
|
// FIXME: We should only do this when the shader actually uses this
|
|
// information.
|
|
unsigned OffsetBytes = 2 * (getStackWidth(MF) * 4);
|
|
int UpperBound = FI == -1 ? MFI.getNumObjects() : FI;
|
|
|
|
for (int i = MFI.getObjectIndexBegin(); i < UpperBound; ++i) {
|
|
OffsetBytes = alignTo(OffsetBytes, MFI.getObjectAlign(i));
|
|
OffsetBytes += MFI.getObjectSize(i);
|
|
// Each register holds 4 bytes, so we must always align the offset to at
|
|
// least 4 bytes, so that 2 frame objects won't share the same register.
|
|
OffsetBytes = alignTo(OffsetBytes, Align(4));
|
|
}
|
|
|
|
if (FI != -1)
|
|
OffsetBytes = alignTo(OffsetBytes, MFI.getObjectAlign(FI));
|
|
|
|
return StackOffset::getFixed(OffsetBytes / (getStackWidth(MF) * 4));
|
|
}
|