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c200b4cb4e
It does not work because of emergency stack slots. This pass was supposed to eliminate dummy registers for the spill instructions, but the register scavenger can introduce more during PrologEpilogInserter, so some would end up left behind if they were needed. The potential for spilling the scratch resource descriptor and offset register makes doing something like this overly complicated. Reserve registers to use for the resource descriptor and use them directly in eliminateFrameIndex. Also removes creating another scratch resource descriptor when directly selecting scratch MUBUF instructions. The choice of which registers are reserved is temporary. For now it attempts to pick the next available registers after the user and system SGPRs. llvm-svn: 254329
35 lines
985 B
C++
35 lines
985 B
C++
//===--------------------- SIFrameLowering.h --------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_AMDGPU_SIFRAMELOWERING_H
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#define LLVM_LIB_TARGET_AMDGPU_SIFRAMELOWERING_H
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#include "AMDGPUFrameLowering.h"
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namespace llvm {
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class SIFrameLowering final : public AMDGPUFrameLowering {
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public:
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SIFrameLowering(StackDirection D, unsigned StackAl, int LAO,
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unsigned TransAl = 1) :
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AMDGPUFrameLowering(D, StackAl, LAO, TransAl) {}
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~SIFrameLowering() override {}
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void emitPrologue(MachineFunction &MF,
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MachineBasicBlock &MBB) const override;
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void processFunctionBeforeFrameFinalized(
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MachineFunction &MF,
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RegScavenger *RS = nullptr) const override;
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};
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}
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#endif
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