1 //===-- X86InstrFoldTables.h - X86 Instruction Folding Tables ---*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file contains the interface to query the X86 memory folding tables. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #ifndef LLVM_LIB_TARGET_X86_X86INSTRFOLDTABLES_H 14 #define LLVM_LIB_TARGET_X86_X86INSTRFOLDTABLES_H 15 16 #include "llvm/Support/DataTypes.h" 17 18 namespace llvm { 19 20 enum { 21 // Select which memory operand is being unfolded. 22 // (stored in bits 0 - 2) 23 TB_INDEX_0 = 0, 24 TB_INDEX_1 = 1, 25 TB_INDEX_2 = 2, 26 TB_INDEX_3 = 3, 27 TB_INDEX_4 = 4, 28 TB_INDEX_MASK = 0x7, 29 30 // Do not insert the reverse map (MemOp -> RegOp) into the table. 31 // This may be needed because there is a many -> one mapping. 32 TB_NO_REVERSE = 1 << 3, 33 34 // Do not insert the forward map (RegOp -> MemOp) into the table. 35 // This is needed for Native Client, which prohibits branch 36 // instructions from using a memory operand. 37 TB_NO_FORWARD = 1 << 4, 38 39 TB_FOLDED_LOAD = 1 << 5, 40 TB_FOLDED_STORE = 1 << 6, 41 TB_FOLDED_BCAST = 1 << 7, 42 43 // Minimum alignment required for load/store. 44 // Used for RegOp->MemOp conversion. Encoded as Log2(Align) + 1 to allow 0 45 // to mean align of 0. 46 // (stored in bits 8 - 11) 47 TB_ALIGN_SHIFT = 8, 48 TB_ALIGN_NONE = 0 << TB_ALIGN_SHIFT, 49 TB_ALIGN_16 = 5 << TB_ALIGN_SHIFT, 50 TB_ALIGN_32 = 6 << TB_ALIGN_SHIFT, 51 TB_ALIGN_64 = 7 << TB_ALIGN_SHIFT, 52 TB_ALIGN_MASK = 0xf << TB_ALIGN_SHIFT, 53 54 // Broadcast type. 55 // (stored in bits 12 - 13) 56 TB_BCAST_TYPE_SHIFT = 12, 57 TB_BCAST_D = 0 << TB_BCAST_TYPE_SHIFT, 58 TB_BCAST_Q = 1 << TB_BCAST_TYPE_SHIFT, 59 TB_BCAST_SS = 2 << TB_BCAST_TYPE_SHIFT, 60 TB_BCAST_SD = 3 << TB_BCAST_TYPE_SHIFT, 61 TB_BCAST_MASK = 0x3 << TB_BCAST_TYPE_SHIFT, 62 63 // Unused bits 14-15 64 }; 65 66 // This struct is used for both the folding and unfold tables. They KeyOp 67 // is used to determine the sorting order. 68 struct X86MemoryFoldTableEntry { 69 uint16_t KeyOp; 70 uint16_t DstOp; 71 uint16_t Flags; 72 73 bool operator<(const X86MemoryFoldTableEntry &RHS) const { 74 return KeyOp < RHS.KeyOp; 75 } 76 bool operator==(const X86MemoryFoldTableEntry &RHS) const { 77 return KeyOp == RHS.KeyOp; 78 } 79 friend bool operator<(const X86MemoryFoldTableEntry &TE, unsigned Opcode) { 80 return TE.KeyOp < Opcode; 81 } 82 }; 83 84 // Look up the memory folding table entry for folding a load and a store into 85 // operand 0. 86 const X86MemoryFoldTableEntry *lookupTwoAddrFoldTable(unsigned RegOp); 87 88 // Look up the memory folding table entry for folding a load or store with 89 // operand OpNum. 90 const X86MemoryFoldTableEntry *lookupFoldTable(unsigned RegOp, unsigned OpNum); 91 92 // Look up the memory unfolding table entry for this instruction. 93 const X86MemoryFoldTableEntry *lookupUnfoldTable(unsigned MemOp); 94 95 } // namespace llvm 96 97 #endif 98