mirror of
https://github.com/c64scene-ar/llvm-6502.git
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09da6b5540
Still only 32-bit ARM using it at this stage, but the promotion allows direct testing via opt and is a reasonably self-contained patch on the way to switching ARM64. At this point, other targets should be able to make use of it without too much difficulty if they want. (See ARM64 commit coming soon for an example). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206485 91177308-0d34-0410-b5e6-96231b3b80d8
585 lines
24 KiB
C++
585 lines
24 KiB
C++
//===-- ARMISelLowering.h - ARM 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 ARM 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 ARMISELLOWERING_H
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#define ARMISELLOWERING_H
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#include "MCTargetDesc/ARMBaseInfo.h"
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#include "llvm/CodeGen/CallingConvLower.h"
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#include "llvm/CodeGen/SelectionDAG.h"
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#include "llvm/Target/TargetLowering.h"
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#include <vector>
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namespace llvm {
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class ARMConstantPoolValue;
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class ARMSubtarget;
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namespace ARMISD {
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// ARM Specific DAG Nodes
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enum NodeType {
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// Start the numbering where the builtin ops and target ops leave off.
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FIRST_NUMBER = ISD::BUILTIN_OP_END,
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Wrapper, // Wrapper - A wrapper node for TargetConstantPool,
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// TargetExternalSymbol, and TargetGlobalAddress.
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WrapperPIC, // WrapperPIC - A wrapper node for TargetGlobalAddress in
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// PIC mode.
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WrapperJT, // WrapperJT - A wrapper node for TargetJumpTable
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// Add pseudo op to model memcpy for struct byval.
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COPY_STRUCT_BYVAL,
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CALL, // Function call.
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CALL_PRED, // Function call that's predicable.
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CALL_NOLINK, // Function call with branch not branch-and-link.
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tCALL, // Thumb function call.
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BRCOND, // Conditional branch.
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BR_JT, // Jumptable branch.
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BR2_JT, // Jumptable branch (2 level - jumptable entry is a jump).
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RET_FLAG, // Return with a flag operand.
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INTRET_FLAG, // Interrupt return with an LR-offset and a flag operand.
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PIC_ADD, // Add with a PC operand and a PIC label.
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CMP, // ARM compare instructions.
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CMN, // ARM CMN instructions.
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CMPZ, // ARM compare that sets only Z flag.
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CMPFP, // ARM VFP compare instruction, sets FPSCR.
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CMPFPw0, // ARM VFP compare against zero instruction, sets FPSCR.
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FMSTAT, // ARM fmstat instruction.
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CMOV, // ARM conditional move instructions.
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BCC_i64,
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RBIT, // ARM bitreverse instruction
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FTOSI, // FP to sint within a FP register.
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FTOUI, // FP to uint within a FP register.
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SITOF, // sint to FP within a FP register.
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UITOF, // uint to FP within a FP register.
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SRL_FLAG, // V,Flag = srl_flag X -> srl X, 1 + save carry out.
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SRA_FLAG, // V,Flag = sra_flag X -> sra X, 1 + save carry out.
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RRX, // V = RRX X, Flag -> srl X, 1 + shift in carry flag.
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ADDC, // Add with carry
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ADDE, // Add using carry
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SUBC, // Sub with carry
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SUBE, // Sub using carry
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VMOVRRD, // double to two gprs.
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VMOVDRR, // Two gprs to double.
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EH_SJLJ_SETJMP, // SjLj exception handling setjmp.
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EH_SJLJ_LONGJMP, // SjLj exception handling longjmp.
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TC_RETURN, // Tail call return pseudo.
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THREAD_POINTER,
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DYN_ALLOC, // Dynamic allocation on the stack.
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MEMBARRIER_MCR, // Memory barrier (MCR)
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PRELOAD, // Preload
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VCEQ, // Vector compare equal.
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VCEQZ, // Vector compare equal to zero.
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VCGE, // Vector compare greater than or equal.
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VCGEZ, // Vector compare greater than or equal to zero.
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VCLEZ, // Vector compare less than or equal to zero.
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VCGEU, // Vector compare unsigned greater than or equal.
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VCGT, // Vector compare greater than.
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VCGTZ, // Vector compare greater than zero.
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VCLTZ, // Vector compare less than zero.
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VCGTU, // Vector compare unsigned greater than.
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VTST, // Vector test bits.
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// Vector shift by immediate:
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VSHL, // ...left
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VSHRs, // ...right (signed)
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VSHRu, // ...right (unsigned)
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// Vector rounding shift by immediate:
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VRSHRs, // ...right (signed)
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VRSHRu, // ...right (unsigned)
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VRSHRN, // ...right narrow
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// Vector saturating shift by immediate:
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VQSHLs, // ...left (signed)
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VQSHLu, // ...left (unsigned)
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VQSHLsu, // ...left (signed to unsigned)
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VQSHRNs, // ...right narrow (signed)
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VQSHRNu, // ...right narrow (unsigned)
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VQSHRNsu, // ...right narrow (signed to unsigned)
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// Vector saturating rounding shift by immediate:
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VQRSHRNs, // ...right narrow (signed)
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VQRSHRNu, // ...right narrow (unsigned)
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VQRSHRNsu, // ...right narrow (signed to unsigned)
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// Vector shift and insert:
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VSLI, // ...left
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VSRI, // ...right
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// Vector get lane (VMOV scalar to ARM core register)
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// (These are used for 8- and 16-bit element types only.)
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VGETLANEu, // zero-extend vector extract element
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VGETLANEs, // sign-extend vector extract element
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// Vector move immediate and move negated immediate:
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VMOVIMM,
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VMVNIMM,
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// Vector move f32 immediate:
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VMOVFPIMM,
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// Vector duplicate:
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VDUP,
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VDUPLANE,
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// Vector shuffles:
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VEXT, // extract
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VREV64, // reverse elements within 64-bit doublewords
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VREV32, // reverse elements within 32-bit words
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VREV16, // reverse elements within 16-bit halfwords
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VZIP, // zip (interleave)
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VUZP, // unzip (deinterleave)
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VTRN, // transpose
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VTBL1, // 1-register shuffle with mask
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VTBL2, // 2-register shuffle with mask
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// Vector multiply long:
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VMULLs, // ...signed
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VMULLu, // ...unsigned
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UMLAL, // 64bit Unsigned Accumulate Multiply
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SMLAL, // 64bit Signed Accumulate Multiply
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// Operands of the standard BUILD_VECTOR node are not legalized, which
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// is fine if BUILD_VECTORs are always lowered to shuffles or other
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// operations, but for ARM some BUILD_VECTORs are legal as-is and their
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// operands need to be legalized. Define an ARM-specific version of
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// BUILD_VECTOR for this purpose.
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BUILD_VECTOR,
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// Floating-point max and min:
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FMAX,
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FMIN,
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VMAXNM,
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VMINNM,
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// Bit-field insert
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BFI,
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// Vector OR with immediate
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VORRIMM,
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// Vector AND with NOT of immediate
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VBICIMM,
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// Vector bitwise select
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VBSL,
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// Vector load N-element structure to all lanes:
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VLD2DUP = ISD::FIRST_TARGET_MEMORY_OPCODE,
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VLD3DUP,
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VLD4DUP,
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// NEON loads with post-increment base updates:
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VLD1_UPD,
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VLD2_UPD,
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VLD3_UPD,
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VLD4_UPD,
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VLD2LN_UPD,
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VLD3LN_UPD,
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VLD4LN_UPD,
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VLD2DUP_UPD,
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VLD3DUP_UPD,
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VLD4DUP_UPD,
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// NEON stores with post-increment base updates:
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VST1_UPD,
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VST2_UPD,
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VST3_UPD,
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VST4_UPD,
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VST2LN_UPD,
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VST3LN_UPD,
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VST4LN_UPD
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};
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}
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/// Define some predicates that are used for node matching.
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namespace ARM {
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bool isBitFieldInvertedMask(unsigned v);
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}
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//===--------------------------------------------------------------------===//
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// ARMTargetLowering - ARM Implementation of the TargetLowering interface
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class ARMTargetLowering : public TargetLowering {
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public:
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explicit ARMTargetLowering(TargetMachine &TM);
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unsigned getJumpTableEncoding() const override;
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SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
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/// ReplaceNodeResults - Replace the results of node with an illegal result
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/// type with new values built out of custom code.
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///
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void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue>&Results,
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SelectionDAG &DAG) const override;
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const char *getTargetNodeName(unsigned Opcode) const override;
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bool isSelectSupported(SelectSupportKind Kind) const override {
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// ARM does not support scalar condition selects on vectors.
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return (Kind != ScalarCondVectorVal);
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}
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/// getSetCCResultType - Return the value type to use for ISD::SETCC.
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EVT getSetCCResultType(LLVMContext &Context, EVT VT) const override;
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MachineBasicBlock *
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EmitInstrWithCustomInserter(MachineInstr *MI,
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MachineBasicBlock *MBB) const override;
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void AdjustInstrPostInstrSelection(MachineInstr *MI,
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SDNode *Node) const override;
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SDValue PerformCMOVCombine(SDNode *N, SelectionDAG &DAG) const;
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SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const override;
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bool isDesirableToTransformToIntegerOp(unsigned Opc, EVT VT) const override;
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/// allowsUnalignedMemoryAccesses - Returns true if the target allows
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/// unaligned memory accesses of the specified type. Returns whether it
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/// is "fast" by reference in the second argument.
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bool allowsUnalignedMemoryAccesses(EVT VT, unsigned AddrSpace,
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bool *Fast) const override;
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EVT getOptimalMemOpType(uint64_t Size,
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unsigned DstAlign, unsigned SrcAlign,
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bool IsMemset, bool ZeroMemset,
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bool MemcpyStrSrc,
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MachineFunction &MF) const override;
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using TargetLowering::isZExtFree;
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bool isZExtFree(SDValue Val, EVT VT2) const override;
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bool allowTruncateForTailCall(Type *Ty1, Type *Ty2) const override;
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/// isLegalAddressingMode - Return true if the addressing mode represented
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/// by AM is legal for this target, for a load/store of the specified type.
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bool isLegalAddressingMode(const AddrMode &AM, Type *Ty) const override;
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bool isLegalT2ScaledAddressingMode(const AddrMode &AM, EVT VT) const;
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/// isLegalICmpImmediate - Return true if the specified immediate is legal
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/// icmp immediate, that is the target has icmp instructions which can
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/// compare a register against the immediate without having to materialize
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/// the immediate into a register.
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bool isLegalICmpImmediate(int64_t Imm) const override;
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/// isLegalAddImmediate - Return true if the specified immediate is legal
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/// add immediate, that is the target has add instructions which can
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/// add a register and the immediate without having to materialize
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/// the immediate into a register.
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bool isLegalAddImmediate(int64_t Imm) const override;
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/// getPreIndexedAddressParts - returns true by value, base pointer and
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/// offset pointer and addressing mode by reference if the node's address
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/// can be legally represented as pre-indexed load / store address.
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bool getPreIndexedAddressParts(SDNode *N, SDValue &Base, SDValue &Offset,
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ISD::MemIndexedMode &AM,
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SelectionDAG &DAG) const override;
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/// getPostIndexedAddressParts - returns true by value, base pointer and
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/// offset pointer and addressing mode by reference if this node can be
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/// combined with a load / store to form a post-indexed load / store.
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bool getPostIndexedAddressParts(SDNode *N, SDNode *Op, SDValue &Base,
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SDValue &Offset, ISD::MemIndexedMode &AM,
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SelectionDAG &DAG) const override;
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void computeMaskedBitsForTargetNode(const SDValue Op, APInt &KnownZero,
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APInt &KnownOne,
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const SelectionDAG &DAG,
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unsigned Depth) const override;
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bool ExpandInlineAsm(CallInst *CI) const override;
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ConstraintType
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getConstraintType(const std::string &Constraint) const override;
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/// Examine constraint string and operand type and determine a weight value.
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/// The operand object must already have been set up with the operand type.
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ConstraintWeight getSingleConstraintMatchWeight(
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AsmOperandInfo &info, const char *constraint) 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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/// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
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/// vector. If it is invalid, don't add anything to Ops. If hasMemory is
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/// true it means one of the asm constraint of the inline asm instruction
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/// being processed is 'm'.
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void LowerAsmOperandForConstraint(SDValue Op, std::string &Constraint,
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std::vector<SDValue> &Ops,
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SelectionDAG &DAG) const override;
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const ARMSubtarget* getSubtarget() const {
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return Subtarget;
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}
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/// getRegClassFor - Return the register class that should be used for the
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/// specified value type.
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const TargetRegisterClass *getRegClassFor(MVT VT) const override;
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/// getMaximalGlobalOffset - Returns the maximal possible offset which can
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/// be used for loads / stores from the global.
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unsigned getMaximalGlobalOffset() const override;
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/// Returns true if a cast between SrcAS and DestAS is a noop.
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bool isNoopAddrSpaceCast(unsigned SrcAS, unsigned DestAS) const override {
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// Addrspacecasts are always noops.
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return true;
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}
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/// createFastISel - This method returns a target specific FastISel object,
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/// or null if the target does not support "fast" ISel.
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FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
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const TargetLibraryInfo *libInfo) const override;
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Sched::Preference getSchedulingPreference(SDNode *N) const override;
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bool
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isShuffleMaskLegal(const SmallVectorImpl<int> &M, EVT VT) const override;
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bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const override;
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/// isFPImmLegal - Returns true if the target can instruction select the
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/// specified FP immediate natively. If false, the legalizer will
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/// materialize the FP immediate as a load from a constant pool.
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bool isFPImmLegal(const APFloat &Imm, EVT VT) const override;
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bool getTgtMemIntrinsic(IntrinsicInfo &Info,
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const CallInst &I,
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unsigned Intrinsic) const override;
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/// \brief Returns true if it is beneficial to convert a load of a constant
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/// to just the constant itself.
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bool shouldConvertConstantLoadToIntImm(const APInt &Imm,
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Type *Ty) const override;
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Value *emitLoadLinked(IRBuilder<> &Builder, Value *Addr,
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AtomicOrdering Ord) const override;
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Value *emitStoreConditional(IRBuilder<> &Builder, Value *Val,
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Value *Addr, AtomicOrdering Ord) const override;
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bool shouldExpandAtomicInIR(Instruction *Inst) const override;
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protected:
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std::pair<const TargetRegisterClass*, uint8_t>
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findRepresentativeClass(MVT VT) const override;
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private:
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/// Subtarget - Keep a pointer to the ARMSubtarget around so that we can
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/// make the right decision when generating code for different targets.
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const ARMSubtarget *Subtarget;
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const TargetRegisterInfo *RegInfo;
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const InstrItineraryData *Itins;
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/// ARMPCLabelIndex - Keep track of the number of ARM PC labels created.
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///
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unsigned ARMPCLabelIndex;
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void addTypeForNEON(MVT VT, MVT PromotedLdStVT, MVT PromotedBitwiseVT);
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void addDRTypeForNEON(MVT VT);
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void addQRTypeForNEON(MVT VT);
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typedef SmallVector<std::pair<unsigned, SDValue>, 8> RegsToPassVector;
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void PassF64ArgInRegs(SDLoc dl, SelectionDAG &DAG,
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SDValue Chain, SDValue &Arg,
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RegsToPassVector &RegsToPass,
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CCValAssign &VA, CCValAssign &NextVA,
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SDValue &StackPtr,
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SmallVectorImpl<SDValue> &MemOpChains,
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ISD::ArgFlagsTy Flags) const;
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SDValue GetF64FormalArgument(CCValAssign &VA, CCValAssign &NextVA,
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SDValue &Root, SelectionDAG &DAG,
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SDLoc dl) const;
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CCAssignFn *CCAssignFnForNode(CallingConv::ID CC, bool Return,
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bool isVarArg) const;
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SDValue LowerMemOpCallTo(SDValue Chain, SDValue StackPtr, SDValue Arg,
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SDLoc dl, SelectionDAG &DAG,
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const CCValAssign &VA,
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ISD::ArgFlagsTy Flags) const;
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SDValue LowerEH_SJLJ_SETJMP(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerEH_SJLJ_LONGJMP(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG,
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const ARMSubtarget *Subtarget) const;
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SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerGlobalAddressDarwin(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerGlobalAddressELF(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerToTLSGeneralDynamicModel(GlobalAddressSDNode *GA,
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SelectionDAG &DAG) const;
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SDValue LowerToTLSExecModels(GlobalAddressSDNode *GA,
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SelectionDAG &DAG,
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TLSModel::Model model) const;
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SDValue LowerGLOBAL_OFFSET_TABLE(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerBR_JT(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerSELECT(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerShiftRightParts(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerShiftLeftParts(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerFLT_ROUNDS_(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerConstantFP(SDValue Op, SelectionDAG &DAG,
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const ARMSubtarget *ST) const;
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SDValue LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG,
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const ARMSubtarget *ST) const;
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SDValue LowerFSINCOS(SDValue Op, SelectionDAG &DAG) const;
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SDValue LowerDivRem(SDValue Op, SelectionDAG &DAG) const;
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/// isFMAFasterThanFMulAndFAdd - Return true if an FMA operation is faster
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/// than a pair of fmul and fadd instructions. fmuladd intrinsics will be
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/// expanded to FMAs when this method returns true, otherwise fmuladd is
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/// expanded to fmul + fadd.
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///
|
|
/// ARM supports both fused and unfused multiply-add operations; we already
|
|
/// lower a pair of fmul and fadd to the latter so it's not clear that there
|
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/// would be a gain or that the gain would be worthwhile enough to risk
|
|
/// correctness bugs.
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bool isFMAFasterThanFMulAndFAdd(EVT VT) const override { return false; }
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|
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SDValue ReconstructShuffle(SDValue Op, SelectionDAG &DAG) const;
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|
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SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
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CallingConv::ID CallConv, bool isVarArg,
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const SmallVectorImpl<ISD::InputArg> &Ins,
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|
SDLoc dl, SelectionDAG &DAG,
|
|
SmallVectorImpl<SDValue> &InVals,
|
|
bool isThisReturn, SDValue ThisVal) const;
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|
|
|
SDValue
|
|
LowerFormalArguments(SDValue Chain,
|
|
CallingConv::ID CallConv, bool isVarArg,
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|
const SmallVectorImpl<ISD::InputArg> &Ins,
|
|
SDLoc dl, SelectionDAG &DAG,
|
|
SmallVectorImpl<SDValue> &InVals) const override;
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|
|
|
int StoreByValRegs(CCState &CCInfo, SelectionDAG &DAG,
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|
SDLoc dl, SDValue &Chain,
|
|
const Value *OrigArg,
|
|
unsigned InRegsParamRecordIdx,
|
|
unsigned OffsetFromOrigArg,
|
|
unsigned ArgOffset,
|
|
unsigned ArgSize,
|
|
bool ForceMutable,
|
|
unsigned ByValStoreOffset,
|
|
unsigned TotalArgRegsSaveSize) const;
|
|
|
|
void VarArgStyleRegisters(CCState &CCInfo, SelectionDAG &DAG,
|
|
SDLoc dl, SDValue &Chain,
|
|
unsigned ArgOffset,
|
|
unsigned TotalArgRegsSaveSize,
|
|
bool ForceMutable = false) const;
|
|
|
|
void computeRegArea(CCState &CCInfo, MachineFunction &MF,
|
|
unsigned InRegsParamRecordIdx,
|
|
unsigned ArgSize,
|
|
unsigned &ArgRegsSize,
|
|
unsigned &ArgRegsSaveSize) const;
|
|
|
|
SDValue
|
|
LowerCall(TargetLowering::CallLoweringInfo &CLI,
|
|
SmallVectorImpl<SDValue> &InVals) const override;
|
|
|
|
/// HandleByVal - Target-specific cleanup for ByVal support.
|
|
void HandleByVal(CCState *, unsigned &, unsigned) const override;
|
|
|
|
/// IsEligibleForTailCallOptimization - Check whether the call is eligible
|
|
/// for tail call optimization. Targets which want to do tail call
|
|
/// optimization should implement this function.
|
|
bool IsEligibleForTailCallOptimization(SDValue Callee,
|
|
CallingConv::ID CalleeCC,
|
|
bool isVarArg,
|
|
bool isCalleeStructRet,
|
|
bool isCallerStructRet,
|
|
const SmallVectorImpl<ISD::OutputArg> &Outs,
|
|
const SmallVectorImpl<SDValue> &OutVals,
|
|
const SmallVectorImpl<ISD::InputArg> &Ins,
|
|
SelectionDAG& DAG) const;
|
|
|
|
bool CanLowerReturn(CallingConv::ID CallConv,
|
|
MachineFunction &MF, bool isVarArg,
|
|
const SmallVectorImpl<ISD::OutputArg> &Outs,
|
|
LLVMContext &Context) const override;
|
|
|
|
SDValue
|
|
LowerReturn(SDValue Chain,
|
|
CallingConv::ID CallConv, bool isVarArg,
|
|
const SmallVectorImpl<ISD::OutputArg> &Outs,
|
|
const SmallVectorImpl<SDValue> &OutVals,
|
|
SDLoc dl, SelectionDAG &DAG) const override;
|
|
|
|
bool isUsedByReturnOnly(SDNode *N, SDValue &Chain) const override;
|
|
|
|
bool mayBeEmittedAsTailCall(CallInst *CI) const override;
|
|
|
|
SDValue getARMCmp(SDValue LHS, SDValue RHS, ISD::CondCode CC,
|
|
SDValue &ARMcc, SelectionDAG &DAG, SDLoc dl) const;
|
|
SDValue getVFPCmp(SDValue LHS, SDValue RHS,
|
|
SelectionDAG &DAG, SDLoc dl) const;
|
|
SDValue duplicateCmp(SDValue Cmp, SelectionDAG &DAG) const;
|
|
|
|
SDValue OptimizeVFPBrcond(SDValue Op, SelectionDAG &DAG) const;
|
|
|
|
void SetupEntryBlockForSjLj(MachineInstr *MI,
|
|
MachineBasicBlock *MBB,
|
|
MachineBasicBlock *DispatchBB, int FI) const;
|
|
|
|
MachineBasicBlock *EmitSjLjDispatchBlock(MachineInstr *MI,
|
|
MachineBasicBlock *MBB) const;
|
|
|
|
bool RemapAddSubWithFlags(MachineInstr *MI, MachineBasicBlock *BB) const;
|
|
|
|
MachineBasicBlock *EmitStructByval(MachineInstr *MI,
|
|
MachineBasicBlock *MBB) const;
|
|
};
|
|
|
|
enum NEONModImmType {
|
|
VMOVModImm,
|
|
VMVNModImm,
|
|
OtherModImm
|
|
};
|
|
|
|
|
|
namespace ARM {
|
|
FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
|
|
const TargetLibraryInfo *libInfo);
|
|
}
|
|
}
|
|
|
|
#endif // ARMISELLOWERING_H
|