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https://github.com/c64scene-ar/llvm-6502.git
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0651a556fe
address of the stack guard was being spilled to the stack. Previously the address of the stack guard would get spilled to the stack if it was impossible to keep it in a register. This patch introduces a new target independent node and pseudo instruction which gets expanded post-RA to a sequence of instructions that load the stack guard value. Register allocator can now just remat the value when it can't keep it in a register. <rdar://problem/12475629> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213967 91177308-0d34-0410-b5e6-96231b3b80d8
119 lines
4.8 KiB
C++
119 lines
4.8 KiB
C++
//===-- llvm/Target/TargetOpcodes.h - Target Indep Opcodes ------*- 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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//
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// This file defines the target independent instruction opcodes.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TARGET_TARGETOPCODES_H
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#define LLVM_TARGET_TARGETOPCODES_H
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namespace llvm {
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/// Invariant opcodes: All instruction sets have these as their low opcodes.
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///
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/// Every instruction defined here must also appear in Target.td and the order
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/// must be the same as in CodeGenTarget.cpp.
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///
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namespace TargetOpcode {
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enum {
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PHI = 0,
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INLINEASM = 1,
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CFI_INSTRUCTION = 2,
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EH_LABEL = 3,
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GC_LABEL = 4,
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/// KILL - This instruction is a noop that is used only to adjust the
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/// liveness of registers. This can be useful when dealing with
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/// sub-registers.
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KILL = 5,
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/// EXTRACT_SUBREG - This instruction takes two operands: a register
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/// that has subregisters, and a subregister index. It returns the
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/// extracted subregister value. This is commonly used to implement
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/// truncation operations on target architectures which support it.
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EXTRACT_SUBREG = 6,
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/// INSERT_SUBREG - This instruction takes three operands: a register that
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/// has subregisters, a register providing an insert value, and a
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/// subregister index. It returns the value of the first register with the
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/// value of the second register inserted. The first register is often
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/// defined by an IMPLICIT_DEF, because it is commonly used to implement
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/// anyext operations on target architectures which support it.
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INSERT_SUBREG = 7,
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/// IMPLICIT_DEF - This is the MachineInstr-level equivalent of undef.
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IMPLICIT_DEF = 8,
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/// SUBREG_TO_REG - This instruction is similar to INSERT_SUBREG except that
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/// the first operand is an immediate integer constant. This constant is
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/// often zero, because it is commonly used to assert that the instruction
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/// defining the register implicitly clears the high bits.
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SUBREG_TO_REG = 9,
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/// COPY_TO_REGCLASS - This instruction is a placeholder for a plain
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/// register-to-register copy into a specific register class. This is only
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/// used between instruction selection and MachineInstr creation, before
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/// virtual registers have been created for all the instructions, and it's
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/// only needed in cases where the register classes implied by the
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/// instructions are insufficient. It is emitted as a COPY MachineInstr.
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COPY_TO_REGCLASS = 10,
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/// DBG_VALUE - a mapping of the llvm.dbg.value intrinsic
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DBG_VALUE = 11,
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/// REG_SEQUENCE - This variadic instruction is used to form a register that
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/// represents a consecutive sequence of sub-registers. It's used as a
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/// register coalescing / allocation aid and must be eliminated before code
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/// emission.
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// In SDNode form, the first operand encodes the register class created by
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// the REG_SEQUENCE, while each subsequent pair names a vreg + subreg index
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// pair. Once it has been lowered to a MachineInstr, the regclass operand
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// is no longer present.
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/// e.g. v1027 = REG_SEQUENCE v1024, 3, v1025, 4, v1026, 5
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/// After register coalescing references of v1024 should be replace with
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/// v1027:3, v1025 with v1027:4, etc.
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REG_SEQUENCE = 12,
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/// COPY - Target-independent register copy. This instruction can also be
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/// used to copy between subregisters of virtual registers.
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COPY = 13,
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/// BUNDLE - This instruction represents an instruction bundle. Instructions
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/// which immediately follow a BUNDLE instruction which are marked with
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/// 'InsideBundle' flag are inside the bundle.
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BUNDLE = 14,
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/// Lifetime markers.
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LIFETIME_START = 15,
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LIFETIME_END = 16,
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/// A Stackmap instruction captures the location of live variables at its
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/// position in the instruction stream. It is followed by a shadow of bytes
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/// that must lie within the function and not contain another stackmap.
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STACKMAP = 17,
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/// Patchable call instruction - this instruction represents a call to a
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/// constant address, followed by a series of NOPs. It is intended to
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/// support optimizations for dynamic languages (such as javascript) that
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/// rewrite calls to runtimes with more efficient code sequences.
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/// This also implies a stack map.
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PATCHPOINT = 18,
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/// This pseudo-instruction loads the stack guard value. Targets which need
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/// to prevent the stack guard value or address from being spilled to the
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/// stack should override TargetLowering::emitLoadStackGuardNode and
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/// additionally expand this pseudo after register allocation.
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LOAD_STACK_GUARD = 19
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};
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} // end namespace TargetOpcode
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} // end namespace llvm
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#endif
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