1//===-- X86InstrCMovSetCC.td - Conditional Move and SetCC --*- tablegen -*-===// 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 describes the X86 conditional move and set on condition 10// instructions. 11// 12//===----------------------------------------------------------------------===// 13 14 15// CMOV instructions. 16let isCodeGenOnly = 1, ForceDisassemble = 1 in { 17let Uses = [EFLAGS], Predicates = [HasCMOV], Constraints = "$src1 = $dst", 18 isCommutable = 1, SchedRW = [WriteCMOV] in { 19 def CMOV16rr 20 : I<0x40, MRMSrcRegCC, (outs GR16:$dst), (ins GR16:$src1, GR16:$src2, ccode:$cond), 21 "cmov${cond}{w}\t{$src2, $dst|$dst, $src2}", 22 [(set GR16:$dst, 23 (X86cmov GR16:$src1, GR16:$src2, timm:$cond, EFLAGS))]>, 24 TB, OpSize16; 25 def CMOV32rr 26 : I<0x40, MRMSrcRegCC, (outs GR32:$dst), (ins GR32:$src1, GR32:$src2, ccode:$cond), 27 "cmov${cond}{l}\t{$src2, $dst|$dst, $src2}", 28 [(set GR32:$dst, 29 (X86cmov GR32:$src1, GR32:$src2, timm:$cond, EFLAGS))]>, 30 TB, OpSize32; 31 def CMOV64rr 32 :RI<0x40, MRMSrcRegCC, (outs GR64:$dst), (ins GR64:$src1, GR64:$src2, ccode:$cond), 33 "cmov${cond}{q}\t{$src2, $dst|$dst, $src2}", 34 [(set GR64:$dst, 35 (X86cmov GR64:$src1, GR64:$src2, timm:$cond, EFLAGS))]>, TB; 36} 37 38let Uses = [EFLAGS], Predicates = [HasCMOV], Constraints = "$src1 = $dst", 39 SchedRW = [WriteCMOV.Folded, WriteCMOV.ReadAfterFold] in { 40 def CMOV16rm 41 : I<0x40, MRMSrcMemCC, (outs GR16:$dst), (ins GR16:$src1, i16mem:$src2, ccode:$cond), 42 "cmov${cond}{w}\t{$src2, $dst|$dst, $src2}", 43 [(set GR16:$dst, (X86cmov GR16:$src1, (loadi16 addr:$src2), 44 timm:$cond, EFLAGS))]>, TB, OpSize16; 45 def CMOV32rm 46 : I<0x40, MRMSrcMemCC, (outs GR32:$dst), (ins GR32:$src1, i32mem:$src2, ccode:$cond), 47 "cmov${cond}{l}\t{$src2, $dst|$dst, $src2}", 48 [(set GR32:$dst, (X86cmov GR32:$src1, (loadi32 addr:$src2), 49 timm:$cond, EFLAGS))]>, TB, OpSize32; 50 def CMOV64rm 51 :RI<0x40, MRMSrcMemCC, (outs GR64:$dst), (ins GR64:$src1, i64mem:$src2, ccode:$cond), 52 "cmov${cond}{q}\t{$src2, $dst|$dst, $src2}", 53 [(set GR64:$dst, (X86cmov GR64:$src1, (loadi64 addr:$src2), 54 timm:$cond, EFLAGS))]>, TB; 55} // Uses = [EFLAGS], Predicates = [HasCMOV], Constraints = "$src1 = $dst" 56} // isCodeGenOnly = 1, ForceDisassemble = 1 57 58def inv_cond_XFORM : SDNodeXForm<imm, [{ 59 X86::CondCode CC = static_cast<X86::CondCode>(N->getZExtValue()); 60 return CurDAG->getTargetConstant(X86::GetOppositeBranchCondition(CC), 61 SDLoc(N), MVT::i8); 62}]>; 63 64// Conditional moves with folded loads with operands swapped and conditions 65// inverted. 66let Predicates = [HasCMOV] in { 67 def : Pat<(X86cmov (loadi16 addr:$src1), GR16:$src2, timm:$cond, EFLAGS), 68 (CMOV16rm GR16:$src2, addr:$src1, (inv_cond_XFORM timm:$cond))>; 69 def : Pat<(X86cmov (loadi32 addr:$src1), GR32:$src2, timm:$cond, EFLAGS), 70 (CMOV32rm GR32:$src2, addr:$src1, (inv_cond_XFORM timm:$cond))>; 71 def : Pat<(X86cmov (loadi64 addr:$src1), GR64:$src2, timm:$cond, EFLAGS), 72 (CMOV64rm GR64:$src2, addr:$src1, (inv_cond_XFORM timm:$cond))>; 73} 74 75// SetCC instructions. 76let Uses = [EFLAGS], isCodeGenOnly = 1, ForceDisassemble = 1 in { 77 def SETCCr : I<0x90, MRMXrCC, (outs GR8:$dst), (ins ccode:$cond), 78 "set${cond}\t$dst", 79 [(set GR8:$dst, (X86setcc timm:$cond, EFLAGS))]>, 80 TB, Sched<[WriteSETCC]>; 81 def SETCCm : I<0x90, MRMXmCC, (outs), (ins i8mem:$dst, ccode:$cond), 82 "set${cond}\t$dst", 83 [(store (X86setcc timm:$cond, EFLAGS), addr:$dst)]>, 84 TB, Sched<[WriteSETCCStore]>; 85} // Uses = [EFLAGS] 86 87// SALC is an undocumented instruction. Information for this instruction can be found 88// here http://www.rcollins.org/secrets/opcodes/SALC.html 89// Set AL if carry. 90let Uses = [EFLAGS], Defs = [AL], SchedRW = [WriteALU] in { 91 def SALC : I<0xD6, RawFrm, (outs), (ins), "salc", []>, Requires<[Not64BitMode]>; 92} 93