1 //===-- X86InstrControl.td - Control Flow Instructions -----*- tablegen -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file describes the X86 jump, return, call, and related instructions.
12 //===----------------------------------------------------------------------===//
14 //===----------------------------------------------------------------------===//
15 // Control Flow Instructions.
18 // Return instructions.
20 // The X86retflag return instructions are variadic because we may add ST0 and
21 // ST1 arguments when returning values on the x87 stack.
22 let isTerminator = 1, isReturn = 1, isBarrier = 1,
23 hasCtrlDep = 1, FPForm = SpecialFP, SchedRW = [WriteJumpLd] in {
24 def RETL : I <0xC3, RawFrm, (outs), (ins variable_ops),
26 [(X86retflag 0)], IIC_RET>, OpSize16, Requires<[Not64BitMode]>;
27 def RETQ : I <0xC3, RawFrm, (outs), (ins variable_ops),
29 [(X86retflag 0)], IIC_RET>, Requires<[In64BitMode]>;
30 def RETW : I <0xC3, RawFrm, (outs), (ins),
33 def RETI : Ii16<0xC2, RawFrm, (outs), (ins i16imm:$amt, variable_ops),
35 [(X86retflag timm:$amt)], IIC_RET_IMM>, OpSize16;
36 def RETIW : Ii16<0xC2, RawFrm, (outs), (ins i16imm:$amt),
38 [], IIC_RET_IMM>, OpSize;
39 def LRETL : I <0xCB, RawFrm, (outs), (ins),
40 "{l}ret{l|f}", [], IIC_RET>, OpSize16;
41 def LRETW : I <0xCB, RawFrm, (outs), (ins),
42 "{l}ret{w|f}", [], IIC_RET>, OpSize;
43 def LRETQ : RI <0xCB, RawFrm, (outs), (ins),
44 "{l}ret{q|f}", [], IIC_RET>;
45 def LRETI : Ii16<0xCA, RawFrm, (outs), (ins i16imm:$amt),
46 "{l}ret{l|f}\t$amt", [], IIC_RET>, OpSize16;
47 def LRETIW : Ii16<0xCA, RawFrm, (outs), (ins i16imm:$amt),
48 "{l}ret{w|f}\t$amt", [], IIC_RET>, OpSize;
51 // Unconditional branches.
52 let isBarrier = 1, isBranch = 1, isTerminator = 1, SchedRW = [WriteJump] in {
53 def JMP_4 : Ii32PCRel<0xE9, RawFrm, (outs), (ins brtarget:$dst),
54 "jmp\t$dst", [(br bb:$dst)], IIC_JMP_REL>, OpSize16;
55 def JMP_2 : Ii16PCRel<0xE9, RawFrm, (outs), (ins brtarget:$dst),
56 "jmp\t$dst", [(br bb:$dst)], IIC_JMP_REL>, OpSize,
57 Requires<[In16BitMode]>;
58 let hasSideEffects = 0 in
59 def JMP_1 : Ii8PCRel<0xEB, RawFrm, (outs), (ins brtarget8:$dst),
60 "jmp\t$dst", [], IIC_JMP_REL>;
63 // Conditional Branches.
64 let isBranch = 1, isTerminator = 1, Uses = [EFLAGS], SchedRW = [WriteJump] in {
65 multiclass ICBr<bits<8> opc1, bits<8> opc4, string asm, PatFrag Cond> {
66 let hasSideEffects = 0 in
67 def _1 : Ii8PCRel <opc1, RawFrm, (outs), (ins brtarget8:$dst), asm, [],
69 def _2 : Ii16PCRel<opc4, RawFrm, (outs), (ins brtarget:$dst), asm,
70 [(X86brcond bb:$dst, Cond, EFLAGS)], IIC_Jcc>, OpSize,
71 TB, Requires<[In16BitMode]>;
72 def _4 : Ii32PCRel<opc4, RawFrm, (outs), (ins brtarget:$dst), asm,
73 [(X86brcond bb:$dst, Cond, EFLAGS)], IIC_Jcc>, TB,
78 defm JO : ICBr<0x70, 0x80, "jo\t$dst" , X86_COND_O>;
79 defm JNO : ICBr<0x71, 0x81, "jno\t$dst" , X86_COND_NO>;
80 defm JB : ICBr<0x72, 0x82, "jb\t$dst" , X86_COND_B>;
81 defm JAE : ICBr<0x73, 0x83, "jae\t$dst", X86_COND_AE>;
82 defm JE : ICBr<0x74, 0x84, "je\t$dst" , X86_COND_E>;
83 defm JNE : ICBr<0x75, 0x85, "jne\t$dst", X86_COND_NE>;
84 defm JBE : ICBr<0x76, 0x86, "jbe\t$dst", X86_COND_BE>;
85 defm JA : ICBr<0x77, 0x87, "ja\t$dst" , X86_COND_A>;
86 defm JS : ICBr<0x78, 0x88, "js\t$dst" , X86_COND_S>;
87 defm JNS : ICBr<0x79, 0x89, "jns\t$dst", X86_COND_NS>;
88 defm JP : ICBr<0x7A, 0x8A, "jp\t$dst" , X86_COND_P>;
89 defm JNP : ICBr<0x7B, 0x8B, "jnp\t$dst", X86_COND_NP>;
90 defm JL : ICBr<0x7C, 0x8C, "jl\t$dst" , X86_COND_L>;
91 defm JGE : ICBr<0x7D, 0x8D, "jge\t$dst", X86_COND_GE>;
92 defm JLE : ICBr<0x7E, 0x8E, "jle\t$dst", X86_COND_LE>;
93 defm JG : ICBr<0x7F, 0x8F, "jg\t$dst" , X86_COND_G>;
95 // jcx/jecx/jrcx instructions.
96 let isBranch = 1, isTerminator = 1, hasSideEffects = 0, SchedRW = [WriteJump] in {
97 // These are the 32-bit versions of this instruction for the asmparser. In
98 // 32-bit mode, the address size prefix is jcxz and the unprefixed version is
101 def JCXZ : Ii8PCRel<0xE3, RawFrm, (outs), (ins brtarget8:$dst),
102 "jcxz\t$dst", [], IIC_JCXZ>, AdSize, Requires<[Not64BitMode]>;
104 def JECXZ_32 : Ii8PCRel<0xE3, RawFrm, (outs), (ins brtarget8:$dst),
105 "jecxz\t$dst", [], IIC_JCXZ>, Requires<[Not64BitMode]>;
107 // J*CXZ instruction: 64-bit versions of this instruction for the asmparser.
108 // In 64-bit mode, the address size prefix is jecxz and the unprefixed version
111 def JECXZ_64 : Ii8PCRel<0xE3, RawFrm, (outs), (ins brtarget8:$dst),
112 "jecxz\t$dst", [], IIC_JCXZ>, AdSize, Requires<[In64BitMode]>;
114 def JRCXZ : Ii8PCRel<0xE3, RawFrm, (outs), (ins brtarget8:$dst),
115 "jrcxz\t$dst", [], IIC_JCXZ>, Requires<[In64BitMode]>;
119 let isBranch = 1, isTerminator = 1, isBarrier = 1, isIndirectBranch = 1 in {
120 def JMP16r : I<0xFF, MRM4r, (outs), (ins GR16:$dst), "jmp{w}\t{*}$dst",
121 [(brind GR16:$dst)], IIC_JMP_REG>, Requires<[Not64BitMode]>,
122 OpSize, Sched<[WriteJump]>;
123 def JMP16m : I<0xFF, MRM4m, (outs), (ins i16mem:$dst), "jmp{w}\t{*}$dst",
124 [(brind (loadi16 addr:$dst))], IIC_JMP_MEM>,
125 Requires<[Not64BitMode]>, OpSize, Sched<[WriteJumpLd]>;
127 def JMP32r : I<0xFF, MRM4r, (outs), (ins GR32:$dst), "jmp{l}\t{*}$dst",
128 [(brind GR32:$dst)], IIC_JMP_REG>, Requires<[Not64BitMode]>,
129 OpSize16, Sched<[WriteJump]>;
130 def JMP32m : I<0xFF, MRM4m, (outs), (ins i32mem:$dst), "jmp{l}\t{*}$dst",
131 [(brind (loadi32 addr:$dst))], IIC_JMP_MEM>,
132 Requires<[Not64BitMode]>, OpSize16, Sched<[WriteJumpLd]>;
134 def JMP64r : I<0xFF, MRM4r, (outs), (ins GR64:$dst), "jmp{q}\t{*}$dst",
135 [(brind GR64:$dst)], IIC_JMP_REG>, Requires<[In64BitMode]>,
137 def JMP64m : I<0xFF, MRM4m, (outs), (ins i64mem:$dst), "jmp{q}\t{*}$dst",
138 [(brind (loadi64 addr:$dst))], IIC_JMP_MEM>,
139 Requires<[In64BitMode]>, Sched<[WriteJumpLd]>;
141 def FARJMP16i : Iseg16<0xEA, RawFrmImm16, (outs),
142 (ins i16imm:$off, i16imm:$seg),
143 "ljmp{w}\t{$seg, $off|$off, $seg}", [],
144 IIC_JMP_FAR_PTR>, OpSize, Sched<[WriteJump]>;
145 def FARJMP32i : Iseg32<0xEA, RawFrmImm16, (outs),
146 (ins i32imm:$off, i16imm:$seg),
147 "ljmp{l}\t{$seg, $off|$off, $seg}", [],
148 IIC_JMP_FAR_PTR>, OpSize16, Sched<[WriteJump]>;
149 def FARJMP64 : RI<0xFF, MRM5m, (outs), (ins opaque80mem:$dst),
150 "ljmp{q}\t{*}$dst", [], IIC_JMP_FAR_MEM>,
153 def FARJMP16m : I<0xFF, MRM5m, (outs), (ins opaque32mem:$dst),
154 "ljmp{w}\t{*}$dst", [], IIC_JMP_FAR_MEM>, OpSize,
155 Sched<[WriteJumpLd]>;
156 def FARJMP32m : I<0xFF, MRM5m, (outs), (ins opaque48mem:$dst),
157 "ljmp{l}\t{*}$dst", [], IIC_JMP_FAR_MEM>, OpSize16,
158 Sched<[WriteJumpLd]>;
163 let SchedRW = [WriteJump] in {
164 def LOOP : Ii8PCRel<0xE2, RawFrm, (outs), (ins brtarget8:$dst), "loop\t$dst", [], IIC_LOOP>;
165 def LOOPE : Ii8PCRel<0xE1, RawFrm, (outs), (ins brtarget8:$dst), "loope\t$dst", [], IIC_LOOPE>;
166 def LOOPNE : Ii8PCRel<0xE0, RawFrm, (outs), (ins brtarget8:$dst), "loopne\t$dst", [], IIC_LOOPNE>;
169 //===----------------------------------------------------------------------===//
170 // Call Instructions...
173 // All calls clobber the non-callee saved registers. ESP is marked as
174 // a use to prevent stack-pointer assignments that appear immediately
175 // before calls from potentially appearing dead. Uses for argument
176 // registers are added manually.
177 let Uses = [ESP] in {
178 def CALLpcrel32 : Ii32PCRel<0xE8, RawFrm,
179 (outs), (ins i32imm_pcrel:$dst),
180 "call{l}\t$dst", [], IIC_CALL_RI>, OpSize16,
181 Requires<[Not64BitMode]>, Sched<[WriteJump]>;
182 def CALL16r : I<0xFF, MRM2r, (outs), (ins GR16:$dst),
183 "call{w}\t{*}$dst", [(X86call GR16:$dst)], IIC_CALL_RI>,
184 OpSize, Requires<[Not64BitMode]>, Sched<[WriteJump]>;
185 def CALL16m : I<0xFF, MRM2m, (outs), (ins i16mem:$dst),
186 "call{w}\t{*}$dst", [(X86call (loadi16 addr:$dst))],
187 IIC_CALL_MEM>, OpSize,
188 Requires<[Not64BitMode,FavorMemIndirectCall]>,
189 Sched<[WriteJumpLd]>;
190 def CALL32r : I<0xFF, MRM2r, (outs), (ins GR32:$dst),
191 "call{l}\t{*}$dst", [(X86call GR32:$dst)], IIC_CALL_RI>,
192 OpSize16, Requires<[Not64BitMode]>, Sched<[WriteJump]>;
193 def CALL32m : I<0xFF, MRM2m, (outs), (ins i32mem:$dst),
194 "call{l}\t{*}$dst", [(X86call (loadi32 addr:$dst))],
195 IIC_CALL_MEM>, OpSize16,
196 Requires<[Not64BitMode,FavorMemIndirectCall]>,
197 Sched<[WriteJumpLd]>;
199 def FARCALL16i : Iseg16<0x9A, RawFrmImm16, (outs),
200 (ins i16imm:$off, i16imm:$seg),
201 "lcall{w}\t{$seg, $off|$off, $seg}", [],
202 IIC_CALL_FAR_PTR>, OpSize, Sched<[WriteJump]>;
203 def FARCALL32i : Iseg32<0x9A, RawFrmImm16, (outs),
204 (ins i32imm:$off, i16imm:$seg),
205 "lcall{l}\t{$seg, $off|$off, $seg}", [],
206 IIC_CALL_FAR_PTR>, OpSize16, Sched<[WriteJump]>;
208 def FARCALL16m : I<0xFF, MRM3m, (outs), (ins opaque32mem:$dst),
209 "lcall{w}\t{*}$dst", [], IIC_CALL_FAR_MEM>, OpSize,
210 Sched<[WriteJumpLd]>;
211 def FARCALL32m : I<0xFF, MRM3m, (outs), (ins opaque48mem:$dst),
212 "lcall{l}\t{*}$dst", [], IIC_CALL_FAR_MEM>, OpSize16,
213 Sched<[WriteJumpLd]>;
215 // callw for 16 bit code for the assembler.
216 let isAsmParserOnly = 1 in
217 def CALLpcrel16 : Ii16PCRel<0xE8, RawFrm,
218 (outs), (ins i16imm_pcrel:$dst),
219 "callw\t$dst", []>, OpSize;
225 let isCall = 1, isTerminator = 1, isReturn = 1, isBarrier = 1,
226 isCodeGenOnly = 1, SchedRW = [WriteJumpLd] in
227 let Uses = [ESP] in {
228 def TCRETURNdi : PseudoI<(outs),
229 (ins i32imm_pcrel:$dst, i32imm:$offset), []>;
230 def TCRETURNri : PseudoI<(outs),
231 (ins ptr_rc_tailcall:$dst, i32imm:$offset), []>;
233 def TCRETURNmi : PseudoI<(outs),
234 (ins i32mem_TC:$dst, i32imm:$offset), []>;
236 // FIXME: The should be pseudo instructions that are lowered when going to
238 def TAILJMPd : Ii32PCRel<0xE9, RawFrm, (outs),
239 (ins i32imm_pcrel:$dst),
240 "jmp\t$dst # TAILCALL",
242 def TAILJMPr : I<0xFF, MRM4r, (outs), (ins ptr_rc_tailcall:$dst),
243 "", [], IIC_JMP_REG>; // FIXME: Remove encoding when JIT is dead.
245 def TAILJMPm : I<0xFF, MRM4m, (outs), (ins i32mem_TC:$dst),
246 "jmp{l}\t{*}$dst # TAILCALL", [], IIC_JMP_MEM>;
250 //===----------------------------------------------------------------------===//
251 // Call Instructions...
254 // RSP is marked as a use to prevent stack-pointer assignments that appear
255 // immediately before calls from potentially appearing dead. Uses for argument
256 // registers are added manually.
257 let isCall = 1, Uses = [RSP], SchedRW = [WriteJump] in {
258 // NOTE: this pattern doesn't match "X86call imm", because we do not know
259 // that the offset between an arbitrary immediate and the call will fit in
260 // the 32-bit pcrel field that we have.
261 def CALL64pcrel32 : Ii32PCRel<0xE8, RawFrm,
262 (outs), (ins i64i32imm_pcrel:$dst),
263 "call{q}\t$dst", [], IIC_CALL_RI>,
264 Requires<[In64BitMode]>;
265 def CALL64r : I<0xFF, MRM2r, (outs), (ins GR64:$dst),
266 "call{q}\t{*}$dst", [(X86call GR64:$dst)],
268 Requires<[In64BitMode]>;
269 def CALL64m : I<0xFF, MRM2m, (outs), (ins i64mem:$dst),
270 "call{q}\t{*}$dst", [(X86call (loadi64 addr:$dst))],
272 Requires<[In64BitMode,FavorMemIndirectCall]>;
274 def FARCALL64 : RI<0xFF, MRM3m, (outs), (ins opaque80mem:$dst),
275 "lcall{q}\t{*}$dst", [], IIC_CALL_FAR_MEM>;
278 let isCall = 1, isCodeGenOnly = 1 in
279 // __chkstk(MSVC): clobber R10, R11 and EFLAGS.
280 // ___chkstk(Mingw64): clobber R10, R11, RAX and EFLAGS, and update RSP.
281 let Defs = [RAX, R10, R11, RSP, EFLAGS],
283 def W64ALLOCA : Ii32PCRel<0xE8, RawFrm,
284 (outs), (ins i64i32imm_pcrel:$dst),
285 "call{q}\t$dst", [], IIC_CALL_RI>,
286 Requires<[IsWin64]>, Sched<[WriteJump]>;
289 let isCall = 1, isTerminator = 1, isReturn = 1, isBarrier = 1,
290 isCodeGenOnly = 1, Uses = [RSP], usesCustomInserter = 1,
291 SchedRW = [WriteJump] in {
292 def TCRETURNdi64 : PseudoI<(outs),
293 (ins i64i32imm_pcrel:$dst, i32imm:$offset),
295 def TCRETURNri64 : PseudoI<(outs),
296 (ins ptr_rc_tailcall:$dst, i32imm:$offset), []>;
298 def TCRETURNmi64 : PseudoI<(outs),
299 (ins i64mem_TC:$dst, i32imm:$offset), []>;
301 def TAILJMPd64 : Ii32PCRel<0xE9, RawFrm, (outs),
302 (ins i64i32imm_pcrel:$dst),
303 "jmp\t$dst # TAILCALL", [], IIC_JMP_REL>;
304 def TAILJMPr64 : I<0xFF, MRM4r, (outs), (ins ptr_rc_tailcall:$dst),
305 "jmp{q}\t{*}$dst # TAILCALL", [], IIC_JMP_MEM>;
308 def TAILJMPm64 : I<0xFF, MRM4m, (outs), (ins i64mem_TC:$dst),
309 "jmp{q}\t{*}$dst # TAILCALL", [], IIC_JMP_MEM>;