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bebd59c74b
The current SystemZ back-end only supports the local-exec TLS access model. This patch adds all required CodeGen support for the other TLS models, which means in particular: - Expand initial-exec TLS accesses by loading TLS offsets from the GOT using @indntpoff relocations. - Expand general-dynamic and local-dynamic accesses by generating the appropriate calls to __tls_get_offset. Note that this routine has a non-standard ABI and requires loading the GOT pointer into %r12, so the patch also adds support for the GLOBAL_OFFSET_TABLE ISD node. - Add a new platform-specific optimization pass to remove redundant __tls_get_offset calls in the local-dynamic model (modeled after the corresponding X86 pass). - Add test cases verifying all access models and optimizations. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229654 91177308-0d34-0410-b5e6-96231b3b80d8
335 lines
14 KiB
C++
335 lines
14 KiB
C++
//===-- SystemZISelLowering.h - SystemZ DAG lowering interface --*- 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 interfaces that SystemZ uses to lower LLVM code into a
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// selection DAG.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZISELLOWERING_H
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#define LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZISELLOWERING_H
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#include "SystemZ.h"
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#include "llvm/CodeGen/MachineBasicBlock.h"
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#include "llvm/CodeGen/SelectionDAG.h"
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#include "llvm/Target/TargetLowering.h"
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namespace llvm {
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namespace SystemZISD {
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enum {
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FIRST_NUMBER = ISD::BUILTIN_OP_END,
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// Return with a flag operand. Operand 0 is the chain operand.
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RET_FLAG,
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// Calls a function. Operand 0 is the chain operand and operand 1
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// is the target address. The arguments start at operand 2.
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// There is an optional glue operand at the end.
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CALL,
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SIBCALL,
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// TLS calls. Like regular calls, except operand 1 is the TLS symbol.
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// (The call target is implicitly __tls_get_offset.)
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TLS_GDCALL,
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TLS_LDCALL,
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// Wraps a TargetGlobalAddress that should be loaded using PC-relative
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// accesses (LARL). Operand 0 is the address.
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PCREL_WRAPPER,
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// Used in cases where an offset is applied to a TargetGlobalAddress.
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// Operand 0 is the full TargetGlobalAddress and operand 1 is a
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// PCREL_WRAPPER for an anchor point. This is used so that we can
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// cheaply refer to either the full address or the anchor point
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// as a register base.
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PCREL_OFFSET,
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// Integer absolute.
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IABS,
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// Integer comparisons. There are three operands: the two values
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// to compare, and an integer of type SystemZICMP.
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ICMP,
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// Floating-point comparisons. The two operands are the values to compare.
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FCMP,
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// Test under mask. The first operand is ANDed with the second operand
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// and the condition codes are set on the result. The third operand is
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// a boolean that is true if the condition codes need to distinguish
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// between CCMASK_TM_MIXED_MSB_0 and CCMASK_TM_MIXED_MSB_1 (which the
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// register forms do but the memory forms don't).
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TM,
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// Branches if a condition is true. Operand 0 is the chain operand;
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// operand 1 is the 4-bit condition-code mask, with bit N in
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// big-endian order meaning "branch if CC=N"; operand 2 is the
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// target block and operand 3 is the flag operand.
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BR_CCMASK,
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// Selects between operand 0 and operand 1. Operand 2 is the
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// mask of condition-code values for which operand 0 should be
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// chosen over operand 1; it has the same form as BR_CCMASK.
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// Operand 3 is the flag operand.
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SELECT_CCMASK,
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// Evaluates to the gap between the stack pointer and the
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// base of the dynamically-allocatable area.
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ADJDYNALLOC,
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// Extracts the value of a 32-bit access register. Operand 0 is
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// the number of the register.
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EXTRACT_ACCESS,
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// Wrappers around the ISD opcodes of the same name. The output and
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// first input operands are GR128s. The trailing numbers are the
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// widths of the second operand in bits.
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UMUL_LOHI64,
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SDIVREM32,
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SDIVREM64,
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UDIVREM32,
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UDIVREM64,
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// Use a series of MVCs to copy bytes from one memory location to another.
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// The operands are:
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// - the target address
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// - the source address
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// - the constant length
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//
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// This isn't a memory opcode because we'd need to attach two
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// MachineMemOperands rather than one.
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MVC,
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// Like MVC, but implemented as a loop that handles X*256 bytes
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// followed by straight-line code to handle the rest (if any).
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// The value of X is passed as an additional operand.
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MVC_LOOP,
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// Similar to MVC and MVC_LOOP, but for logic operations (AND, OR, XOR).
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NC,
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NC_LOOP,
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OC,
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OC_LOOP,
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XC,
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XC_LOOP,
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// Use CLC to compare two blocks of memory, with the same comments
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// as for MVC and MVC_LOOP.
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CLC,
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CLC_LOOP,
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// Use an MVST-based sequence to implement stpcpy().
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STPCPY,
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// Use a CLST-based sequence to implement strcmp(). The two input operands
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// are the addresses of the strings to compare.
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STRCMP,
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// Use an SRST-based sequence to search a block of memory. The first
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// operand is the end address, the second is the start, and the third
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// is the character to search for. CC is set to 1 on success and 2
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// on failure.
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SEARCH_STRING,
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// Store the CC value in bits 29 and 28 of an integer.
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IPM,
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// Perform a serialization operation. (BCR 15,0 or BCR 14,0.)
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SERIALIZE,
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// Wrappers around the inner loop of an 8- or 16-bit ATOMIC_SWAP or
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// ATOMIC_LOAD_<op>.
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//
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// Operand 0: the address of the containing 32-bit-aligned field
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// Operand 1: the second operand of <op>, in the high bits of an i32
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// for everything except ATOMIC_SWAPW
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// Operand 2: how many bits to rotate the i32 left to bring the first
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// operand into the high bits
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// Operand 3: the negative of operand 2, for rotating the other way
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// Operand 4: the width of the field in bits (8 or 16)
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ATOMIC_SWAPW = ISD::FIRST_TARGET_MEMORY_OPCODE,
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ATOMIC_LOADW_ADD,
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ATOMIC_LOADW_SUB,
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ATOMIC_LOADW_AND,
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ATOMIC_LOADW_OR,
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ATOMIC_LOADW_XOR,
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ATOMIC_LOADW_NAND,
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ATOMIC_LOADW_MIN,
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ATOMIC_LOADW_MAX,
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ATOMIC_LOADW_UMIN,
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ATOMIC_LOADW_UMAX,
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// A wrapper around the inner loop of an ATOMIC_CMP_SWAP.
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//
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// Operand 0: the address of the containing 32-bit-aligned field
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// Operand 1: the compare value, in the low bits of an i32
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// Operand 2: the swap value, in the low bits of an i32
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// Operand 3: how many bits to rotate the i32 left to bring the first
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// operand into the high bits
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// Operand 4: the negative of operand 2, for rotating the other way
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// Operand 5: the width of the field in bits (8 or 16)
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ATOMIC_CMP_SWAPW,
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// Prefetch from the second operand using the 4-bit control code in
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// the first operand. The code is 1 for a load prefetch and 2 for
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// a store prefetch.
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PREFETCH
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};
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// Return true if OPCODE is some kind of PC-relative address.
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inline bool isPCREL(unsigned Opcode) {
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return Opcode == PCREL_WRAPPER || Opcode == PCREL_OFFSET;
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}
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} // end namespace SystemZISD
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namespace SystemZICMP {
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// Describes whether an integer comparison needs to be signed or unsigned,
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// or whether either type is OK.
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enum {
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Any,
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UnsignedOnly,
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SignedOnly
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};
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} // end namespace SystemZICMP
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class SystemZSubtarget;
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class SystemZTargetMachine;
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class SystemZTargetLowering : public TargetLowering {
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public:
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explicit SystemZTargetLowering(const TargetMachine &TM,
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const SystemZSubtarget &STI);
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// Override TargetLowering.
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MVT getScalarShiftAmountTy(EVT LHSTy) const override {
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return MVT::i32;
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}
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EVT getSetCCResultType(LLVMContext &, EVT) const override;
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bool isFMAFasterThanFMulAndFAdd(EVT VT) const override;
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bool isFPImmLegal(const APFloat &Imm, EVT VT) const override;
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bool isLegalAddressingMode(const AddrMode &AM, Type *Ty) const override;
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bool allowsMisalignedMemoryAccesses(EVT VT, unsigned AS,
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unsigned Align,
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bool *Fast) const override;
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bool isTruncateFree(Type *, Type *) const override;
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bool isTruncateFree(EVT, EVT) const override;
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const char *getTargetNodeName(unsigned Opcode) const override;
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std::pair<unsigned, const TargetRegisterClass *>
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getRegForInlineAsmConstraint(const std::string &Constraint,
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MVT VT) const override;
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TargetLowering::ConstraintType
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getConstraintType(const std::string &Constraint) const override;
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TargetLowering::ConstraintWeight
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getSingleConstraintMatchWeight(AsmOperandInfo &info,
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const char *constraint) const override;
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void LowerAsmOperandForConstraint(SDValue Op,
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std::string &Constraint,
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std::vector<SDValue> &Ops,
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SelectionDAG &DAG) const override;
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MachineBasicBlock *EmitInstrWithCustomInserter(MachineInstr *MI,
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MachineBasicBlock *BB) const
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override;
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SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
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bool allowTruncateForTailCall(Type *, Type *) const override;
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bool mayBeEmittedAsTailCall(CallInst *CI) const override;
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SDValue LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv,
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bool isVarArg,
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const SmallVectorImpl<ISD::InputArg> &Ins,
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SDLoc DL, SelectionDAG &DAG,
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SmallVectorImpl<SDValue> &InVals) const override;
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SDValue LowerCall(CallLoweringInfo &CLI,
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SmallVectorImpl<SDValue> &InVals) const override;
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SDValue LowerReturn(SDValue Chain, CallingConv::ID CallConv, bool IsVarArg,
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const SmallVectorImpl<ISD::OutputArg> &Outs,
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const SmallVectorImpl<SDValue> &OutVals,
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SDLoc DL, SelectionDAG &DAG) const override;
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SDValue prepareVolatileOrAtomicLoad(SDValue Chain, SDLoc DL,
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SelectionDAG &DAG) const override;
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SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const override;
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private:
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const SystemZSubtarget &Subtarget;
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// Implement LowerOperation for individual opcodes.
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SDValue lowerSETCC(SDValue Op, SelectionDAG &DAG) const;
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SDValue lowerBR_CC(SDValue Op, SelectionDAG &DAG) const;
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SDValue lowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
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SDValue lowerGlobalAddress(GlobalAddressSDNode *Node,
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SelectionDAG &DAG) const;
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SDValue lowerTLSGetOffset(GlobalAddressSDNode *Node,
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SelectionDAG &DAG, unsigned Opcode,
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SDValue GOTOffset) const;
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SDValue lowerGlobalTLSAddress(GlobalAddressSDNode *Node,
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SelectionDAG &DAG) const;
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SDValue lowerBlockAddress(BlockAddressSDNode *Node,
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SelectionDAG &DAG) const;
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SDValue lowerJumpTable(JumpTableSDNode *JT, SelectionDAG &DAG) const;
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SDValue lowerConstantPool(ConstantPoolSDNode *CP, SelectionDAG &DAG) const;
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SDValue lowerVASTART(SDValue Op, SelectionDAG &DAG) const;
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SDValue lowerVACOPY(SDValue Op, SelectionDAG &DAG) const;
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SDValue lowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG) const;
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SDValue lowerSMUL_LOHI(SDValue Op, SelectionDAG &DAG) const;
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SDValue lowerUMUL_LOHI(SDValue Op, SelectionDAG &DAG) const;
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SDValue lowerSDIVREM(SDValue Op, SelectionDAG &DAG) const;
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SDValue lowerUDIVREM(SDValue Op, SelectionDAG &DAG) const;
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SDValue lowerBITCAST(SDValue Op, SelectionDAG &DAG) const;
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SDValue lowerOR(SDValue Op, SelectionDAG &DAG) const;
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SDValue lowerATOMIC_LOAD(SDValue Op, SelectionDAG &DAG) const;
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SDValue lowerATOMIC_STORE(SDValue Op, SelectionDAG &DAG) const;
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SDValue lowerATOMIC_LOAD_OP(SDValue Op, SelectionDAG &DAG,
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unsigned Opcode) const;
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SDValue lowerATOMIC_LOAD_SUB(SDValue Op, SelectionDAG &DAG) const;
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SDValue lowerATOMIC_CMP_SWAP(SDValue Op, SelectionDAG &DAG) const;
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SDValue lowerLOAD_SEQUENCE_POINT(SDValue Op, SelectionDAG &DAG) const;
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SDValue lowerSTACKSAVE(SDValue Op, SelectionDAG &DAG) const;
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SDValue lowerSTACKRESTORE(SDValue Op, SelectionDAG &DAG) const;
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SDValue lowerPREFETCH(SDValue Op, SelectionDAG &DAG) const;
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// If the last instruction before MBBI in MBB was some form of COMPARE,
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// try to replace it with a COMPARE AND BRANCH just before MBBI.
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// CCMask and Target are the BRC-like operands for the branch.
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// Return true if the change was made.
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bool convertPrevCompareToBranch(MachineBasicBlock *MBB,
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MachineBasicBlock::iterator MBBI,
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unsigned CCMask,
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MachineBasicBlock *Target) const;
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// Implement EmitInstrWithCustomInserter for individual operation types.
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MachineBasicBlock *emitSelect(MachineInstr *MI,
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MachineBasicBlock *BB) const;
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MachineBasicBlock *emitCondStore(MachineInstr *MI,
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MachineBasicBlock *BB,
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unsigned StoreOpcode, unsigned STOCOpcode,
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bool Invert) const;
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MachineBasicBlock *emitExt128(MachineInstr *MI,
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MachineBasicBlock *MBB,
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bool ClearEven, unsigned SubReg) const;
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MachineBasicBlock *emitAtomicLoadBinary(MachineInstr *MI,
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MachineBasicBlock *BB,
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unsigned BinOpcode, unsigned BitSize,
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bool Invert = false) const;
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MachineBasicBlock *emitAtomicLoadMinMax(MachineInstr *MI,
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MachineBasicBlock *MBB,
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unsigned CompareOpcode,
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unsigned KeepOldMask,
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unsigned BitSize) const;
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MachineBasicBlock *emitAtomicCmpSwapW(MachineInstr *MI,
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MachineBasicBlock *BB) const;
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MachineBasicBlock *emitMemMemWrapper(MachineInstr *MI,
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MachineBasicBlock *BB,
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unsigned Opcode) const;
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MachineBasicBlock *emitStringWrapper(MachineInstr *MI,
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MachineBasicBlock *BB,
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unsigned Opcode) const;
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};
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} // end namespace llvm
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#endif
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