xref: /freebsd/contrib/llvm-project/llvm/lib/Target/X86/X86InstrSystem.td (revision 4b9d605768acabc460aa6dcfe8a1f8db35b16794) 
1//===-- X86InstrSystem.td - System Instructions ------------*- 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 instructions that are generally used in
10// privileged modes.  These are not typically used by the compiler, but are
11// supported for the assembler and disassembler.
12//
13//===----------------------------------------------------------------------===//
14
15let SchedRW = [WriteSystem] in {
16let Defs = [RAX, RDX] in
17def RDTSC : I<0x31, RawFrm, (outs), (ins), "rdtsc", []>, TB;
18
19let Defs = [RAX, RCX, RDX] in
20def RDTSCP : I<0x01, MRM_F9, (outs), (ins), "rdtscp", []>, TB;
21
22// CPU flow control instructions
23
24let mayLoad = 1, mayStore = 0, hasSideEffects = 1, isTrap = 1 in {
25  def TRAP    : I<0x0B, RawFrm, (outs), (ins), "ud2", [(trap)]>, TB;
26
27  def UD1Wm   : I<0xB9, MRMSrcMem, (outs), (ins GR16:$src1, i16mem:$src2),
28                  "ud1{w}\t{$src2, $src1|$src1, $src2}", []>, TB, OpSize16;
29  def UD1Lm   : I<0xB9, MRMSrcMem, (outs), (ins GR32:$src1, i32mem:$src2),
30                  "ud1{l}\t{$src2, $src1|$src1, $src2}", []>, TB, OpSize32;
31  def UD1Qm   : RI<0xB9, MRMSrcMem, (outs), (ins GR64:$src1, i64mem:$src2),
32                   "ud1{q}\t{$src2, $src1|$src1, $src2}", []>, TB;
33
34  def UD1Wr   : I<0xB9, MRMSrcReg, (outs), (ins GR16:$src1, GR16:$src2),
35                  "ud1{w}\t{$src2, $src1|$src1, $src2}", []>, TB, OpSize16;
36  def UD1Lr   : I<0xB9, MRMSrcReg, (outs), (ins GR32:$src1, GR32:$src2),
37                  "ud1{l}\t{$src2, $src1|$src1, $src2}", []>, TB, OpSize32;
38  def UD1Qr   : RI<0xB9, MRMSrcReg, (outs), (ins GR64:$src1, GR64:$src2),
39                   "ud1{q}\t{$src2, $src1|$src1, $src2}", []>, TB;
40}
41
42let isTerminator = 1 in
43  def HLT : I<0xF4, RawFrm, (outs), (ins), "hlt", []>;
44def RSM : I<0xAA, RawFrm, (outs), (ins), "rsm", []>, TB;
45
46// Interrupt and SysCall Instructions.
47let Uses = [EFLAGS] in
48  def INTO : I<0xce, RawFrm, (outs), (ins), "into", []>, Requires<[Not64BitMode]>;
49
50def INT3 : I<0xcc, RawFrm, (outs), (ins), "int3", [(int_x86_int (i8 3))]>;
51
52def UBSAN_UD1 : PseudoI<(outs), (ins i32imm:$kind), [(ubsantrap (i32 timm:$kind))]>;
53// The long form of "int $3" turns into int3 as a size optimization.
54// FIXME: This doesn't work because InstAlias can't match immediate constants.
55//def : InstAlias<"int\t$3", (INT3)>;
56
57def INT : Ii8<0xcd, RawFrm, (outs), (ins u8imm:$trap), "int\t$trap",
58              [(int_x86_int timm:$trap)]>;
59
60
61def SYSCALL  : I<0x05, RawFrm, (outs), (ins), "syscall", []>, TB;
62def SYSRET   : I<0x07, RawFrm, (outs), (ins), "sysret{l}", []>, TB;
63def SYSRET64 :RI<0x07, RawFrm, (outs), (ins), "sysretq", []>, TB,
64               Requires<[In64BitMode]>;
65
66def SYSENTER : I<0x34, RawFrm, (outs), (ins), "sysenter", []>, TB;
67
68def SYSEXIT   : I<0x35, RawFrm, (outs), (ins), "sysexit{l}", []>, TB;
69def SYSEXIT64 :RI<0x35, RawFrm, (outs), (ins), "sysexitq", []>, TB,
70                  Requires<[In64BitMode]>;
71} // SchedRW
72
73def : Pat<(debugtrap),
74          (INT3)>, Requires<[NotPS]>;
75def : Pat<(debugtrap),
76          (INT (i8 0x41))>, Requires<[IsPS]>;
77
78//===----------------------------------------------------------------------===//
79//  Input/Output Instructions.
80//
81let SchedRW = [WriteSystem] in {
82let Defs = [AL], Uses = [DX] in
83def IN8rr  : I<0xEC, RawFrm, (outs), (ins), "in{b}\t{%dx, %al|al, dx}", []>;
84let Defs = [AX], Uses = [DX] in
85def IN16rr : I<0xED, RawFrm, (outs), (ins), "in{w}\t{%dx, %ax|ax, dx}", []>,
86               OpSize16;
87let Defs = [EAX], Uses = [DX] in
88def IN32rr : I<0xED, RawFrm, (outs), (ins), "in{l}\t{%dx, %eax|eax, dx}", []>,
89               OpSize32;
90
91let Defs = [AL] in
92def IN8ri  : Ii8<0xE4, RawFrm, (outs), (ins u8imm:$port),
93                 "in{b}\t{$port, %al|al, $port}", []>;
94let Defs = [AX] in
95def IN16ri : Ii8<0xE5, RawFrm, (outs), (ins u8imm:$port),
96                 "in{w}\t{$port, %ax|ax, $port}", []>, OpSize16;
97let Defs = [EAX] in
98def IN32ri : Ii8<0xE5, RawFrm, (outs), (ins u8imm:$port),
99                 "in{l}\t{$port, %eax|eax, $port}", []>, OpSize32;
100
101let Uses = [DX, AL] in
102def OUT8rr  : I<0xEE, RawFrm, (outs), (ins), "out{b}\t{%al, %dx|dx, al}", []>;
103let Uses = [DX, AX] in
104def OUT16rr : I<0xEF, RawFrm, (outs), (ins), "out{w}\t{%ax, %dx|dx, ax}", []>,
105                OpSize16;
106let Uses = [DX, EAX] in
107def OUT32rr : I<0xEF, RawFrm, (outs), (ins), "out{l}\t{%eax, %dx|dx, eax}", []>,
108                OpSize32;
109
110let Uses = [AL] in
111def OUT8ir  : Ii8<0xE6, RawFrm, (outs), (ins u8imm:$port),
112                   "out{b}\t{%al, $port|$port, al}", []>;
113let Uses = [AX] in
114def OUT16ir : Ii8<0xE7, RawFrm, (outs), (ins u8imm:$port),
115                   "out{w}\t{%ax, $port|$port, ax}", []>, OpSize16;
116let Uses = [EAX] in
117def OUT32ir : Ii8<0xE7, RawFrm, (outs), (ins u8imm:$port),
118                  "out{l}\t{%eax, $port|$port, eax}", []>, OpSize32;
119
120} // SchedRW
121
122//===----------------------------------------------------------------------===//
123// Moves to and from debug registers
124
125let SchedRW = [WriteSystem] in {
126def MOV32rd : I<0x21, MRMDestReg, (outs GR32:$dst), (ins DEBUG_REG:$src),
127                "mov{l}\t{$src, $dst|$dst, $src}", []>, TB,
128                Requires<[Not64BitMode]>;
129def MOV64rd : I<0x21, MRMDestReg, (outs GR64:$dst), (ins DEBUG_REG:$src),
130                "mov{q}\t{$src, $dst|$dst, $src}", []>, TB,
131                Requires<[In64BitMode]>;
132
133def MOV32dr : I<0x23, MRMSrcReg, (outs DEBUG_REG:$dst), (ins GR32:$src),
134                "mov{l}\t{$src, $dst|$dst, $src}", []>, TB,
135                Requires<[Not64BitMode]>;
136def MOV64dr : I<0x23, MRMSrcReg, (outs DEBUG_REG:$dst), (ins GR64:$src),
137                "mov{q}\t{$src, $dst|$dst, $src}", []>, TB,
138                Requires<[In64BitMode]>;
139} // SchedRW
140
141//===----------------------------------------------------------------------===//
142// Moves to and from control registers
143
144let SchedRW = [WriteSystem] in {
145def MOV32rc : I<0x20, MRMDestReg, (outs GR32:$dst), (ins CONTROL_REG:$src),
146                "mov{l}\t{$src, $dst|$dst, $src}", []>, TB,
147                Requires<[Not64BitMode]>;
148def MOV64rc : I<0x20, MRMDestReg, (outs GR64:$dst), (ins CONTROL_REG:$src),
149                "mov{q}\t{$src, $dst|$dst, $src}", []>, TB,
150                Requires<[In64BitMode]>;
151
152def MOV32cr : I<0x22, MRMSrcReg, (outs CONTROL_REG:$dst), (ins GR32:$src),
153                "mov{l}\t{$src, $dst|$dst, $src}", []>, TB,
154                Requires<[Not64BitMode]>;
155def MOV64cr : I<0x22, MRMSrcReg, (outs CONTROL_REG:$dst), (ins GR64:$src),
156                "mov{q}\t{$src, $dst|$dst, $src}", []>, TB,
157                Requires<[In64BitMode]>;
158} // SchedRW
159
160//===----------------------------------------------------------------------===//
161// Segment override instruction prefixes
162
163let SchedRW = [WriteNop] in {
164def CS_PREFIX : I<0x2E, PrefixByte, (outs), (ins), "cs", []>;
165def SS_PREFIX : I<0x36, PrefixByte, (outs), (ins), "ss", []>;
166def DS_PREFIX : I<0x3E, PrefixByte, (outs), (ins), "ds", []>;
167def ES_PREFIX : I<0x26, PrefixByte, (outs), (ins), "es", []>;
168def FS_PREFIX : I<0x64, PrefixByte, (outs), (ins), "fs", []>;
169def GS_PREFIX : I<0x65, PrefixByte, (outs), (ins), "gs", []>;
170} // SchedRW
171
172//===----------------------------------------------------------------------===//
173// Address-size override prefixes.
174//
175
176let SchedRW = [WriteNop] in {
177def ADDR16_PREFIX : I<0x67, PrefixByte, (outs), (ins), "addr16", []>,
178                      Requires<[In32BitMode]>;
179def ADDR32_PREFIX : I<0x67, PrefixByte, (outs), (ins), "addr32", []>,
180                      Requires<[In64BitMode]>;
181} // SchedRW
182
183//===----------------------------------------------------------------------===//
184// Moves to and from segment registers.
185//
186
187let SchedRW = [WriteMove] in {
188def MOV16rs : I<0x8C, MRMDestReg, (outs GR16:$dst), (ins SEGMENT_REG:$src),
189                "mov{w}\t{$src, $dst|$dst, $src}", []>, OpSize16;
190def MOV32rs : I<0x8C, MRMDestReg, (outs GR32:$dst), (ins SEGMENT_REG:$src),
191                "mov{l}\t{$src, $dst|$dst, $src}", []>, OpSize32;
192def MOV64rs : RI<0x8C, MRMDestReg, (outs GR64:$dst), (ins SEGMENT_REG:$src),
193                 "mov{q}\t{$src, $dst|$dst, $src}", []>;
194let mayStore = 1 in {
195def MOV16ms : I<0x8C, MRMDestMem, (outs), (ins i16mem:$dst, SEGMENT_REG:$src),
196                "mov{w}\t{$src, $dst|$dst, $src}", []>;
197}
198def MOV16sr : I<0x8E, MRMSrcReg, (outs SEGMENT_REG:$dst), (ins GR16:$src),
199                "mov{w}\t{$src, $dst|$dst, $src}", []>, OpSize16;
200def MOV32sr : I<0x8E, MRMSrcReg, (outs SEGMENT_REG:$dst), (ins GR32:$src),
201                "mov{l}\t{$src, $dst|$dst, $src}", []>, OpSize32;
202def MOV64sr : RI<0x8E, MRMSrcReg, (outs SEGMENT_REG:$dst), (ins GR64:$src),
203                 "mov{q}\t{$src, $dst|$dst, $src}", []>;
204let mayLoad = 1 in {
205def MOV16sm : I<0x8E, MRMSrcMem, (outs SEGMENT_REG:$dst), (ins i16mem:$src),
206                "mov{w}\t{$src, $dst|$dst, $src}", []>;
207}
208} // SchedRW
209
210//===----------------------------------------------------------------------===//
211// Segmentation support instructions.
212
213let SchedRW = [WriteSystem] in {
214def SWAPGS : I<0x01, MRM_F8, (outs), (ins), "swapgs", []>, TB;
215
216let mayLoad = 1 in
217def LAR16rm : I<0x02, MRMSrcMem, (outs GR16:$dst), (ins i16mem:$src),
218                "lar{w}\t{$src, $dst|$dst, $src}", []>, TB,
219                OpSize16;
220def LAR16rr : I<0x02, MRMSrcReg, (outs GR16:$dst), (ins GR16orGR32orGR64:$src),
221                "lar{w}\t{$src, $dst|$dst, $src}", []>, TB,
222                OpSize16;
223
224let mayLoad = 1 in
225def LAR32rm : I<0x02, MRMSrcMem, (outs GR32:$dst), (ins i16mem:$src),
226                "lar{l}\t{$src, $dst|$dst, $src}", []>, TB,
227                OpSize32;
228def LAR32rr : I<0x02, MRMSrcReg, (outs GR32:$dst), (ins GR16orGR32orGR64:$src),
229                "lar{l}\t{$src, $dst|$dst, $src}", []>, TB,
230                OpSize32;
231let mayLoad = 1 in
232def LAR64rm : RI<0x02, MRMSrcMem, (outs GR64:$dst), (ins i16mem:$src),
233                 "lar{q}\t{$src, $dst|$dst, $src}", []>, TB;
234def LAR64rr : RI<0x02, MRMSrcReg, (outs GR64:$dst), (ins GR16orGR32orGR64:$src),
235                 "lar{q}\t{$src, $dst|$dst, $src}", []>, TB;
236
237let mayLoad = 1 in
238def LSL16rm : I<0x03, MRMSrcMem, (outs GR16:$dst), (ins i16mem:$src),
239                "lsl{w}\t{$src, $dst|$dst, $src}", []>, TB,
240                OpSize16;
241def LSL16rr : I<0x03, MRMSrcReg, (outs GR16:$dst), (ins GR16orGR32orGR64:$src),
242                "lsl{w}\t{$src, $dst|$dst, $src}", []>, TB,
243                OpSize16;
244let mayLoad = 1 in
245def LSL32rm : I<0x03, MRMSrcMem, (outs GR32:$dst), (ins i16mem:$src),
246                "lsl{l}\t{$src, $dst|$dst, $src}", []>, TB,
247                OpSize32;
248def LSL32rr : I<0x03, MRMSrcReg, (outs GR32:$dst), (ins GR16orGR32orGR64:$src),
249                "lsl{l}\t{$src, $dst|$dst, $src}", []>, TB,
250                OpSize32;
251let mayLoad = 1 in
252def LSL64rm : RI<0x03, MRMSrcMem, (outs GR64:$dst), (ins i16mem:$src),
253                 "lsl{q}\t{$src, $dst|$dst, $src}", []>, TB;
254def LSL64rr : RI<0x03, MRMSrcReg, (outs GR64:$dst), (ins GR16orGR32orGR64:$src),
255                 "lsl{q}\t{$src, $dst|$dst, $src}", []>, TB;
256
257def INVLPG : I<0x01, MRM7m, (outs), (ins i8mem:$addr), "invlpg\t$addr", []>, TB;
258
259def STR16r : I<0x00, MRM1r, (outs GR16:$dst), (ins),
260               "str{w}\t$dst", []>, TB, OpSize16;
261def STR32r : I<0x00, MRM1r, (outs GR32:$dst), (ins),
262               "str{l}\t$dst", []>, TB, OpSize32;
263def STR64r : RI<0x00, MRM1r, (outs GR64:$dst), (ins),
264                "str{q}\t$dst", []>, TB;
265let mayStore = 1 in
266def STRm   : I<0x00, MRM1m, (outs), (ins i16mem:$dst), "str{w}\t$dst", []>, TB;
267
268def LTRr : I<0x00, MRM3r, (outs), (ins GR16:$src), "ltr{w}\t$src", []>, TB;
269let mayLoad = 1 in
270def LTRm : I<0x00, MRM3m, (outs), (ins i16mem:$src), "ltr{w}\t$src", []>, TB;
271
272def PUSHCS16 : I<0x0E, RawFrm, (outs), (ins), "push{w}\t{%cs|cs}", []>,
273                 OpSize16, Requires<[Not64BitMode]>;
274def PUSHCS32 : I<0x0E, RawFrm, (outs), (ins), "push{l}\t{%cs|cs}", []>,
275                 OpSize32, Requires<[Not64BitMode]>;
276def PUSHSS16 : I<0x16, RawFrm, (outs), (ins), "push{w}\t{%ss|ss}", []>,
277                 OpSize16, Requires<[Not64BitMode]>;
278def PUSHSS32 : I<0x16, RawFrm, (outs), (ins), "push{l}\t{%ss|ss}", []>,
279                 OpSize32, Requires<[Not64BitMode]>;
280def PUSHDS16 : I<0x1E, RawFrm, (outs), (ins), "push{w}\t{%ds|ds}", []>,
281                 OpSize16, Requires<[Not64BitMode]>;
282def PUSHDS32 : I<0x1E, RawFrm, (outs), (ins), "push{l}\t{%ds|ds}", []>,
283                 OpSize32, Requires<[Not64BitMode]>;
284def PUSHES16 : I<0x06, RawFrm, (outs), (ins), "push{w}\t{%es|es}", []>,
285                 OpSize16, Requires<[Not64BitMode]>;
286def PUSHES32 : I<0x06, RawFrm, (outs), (ins), "push{l}\t{%es|es}", []>,
287                 OpSize32, Requires<[Not64BitMode]>;
288def PUSHFS16 : I<0xa0, RawFrm, (outs), (ins), "push{w}\t{%fs|fs}", []>,
289                 OpSize16, TB;
290def PUSHFS32 : I<0xa0, RawFrm, (outs), (ins), "push{l}\t{%fs|fs}", []>, TB,
291                 OpSize32, Requires<[Not64BitMode]>;
292def PUSHGS16 : I<0xa8, RawFrm, (outs), (ins), "push{w}\t{%gs|gs}", []>,
293                 OpSize16, TB;
294def PUSHGS32 : I<0xa8, RawFrm, (outs), (ins), "push{l}\t{%gs|gs}", []>, TB,
295                 OpSize32, Requires<[Not64BitMode]>;
296def PUSHFS64 : I<0xa0, RawFrm, (outs), (ins), "push{q}\t{%fs|fs}", []>, TB,
297                 OpSize32, Requires<[In64BitMode]>;
298def PUSHGS64 : I<0xa8, RawFrm, (outs), (ins), "push{q}\t{%gs|gs}", []>, TB,
299                 OpSize32, Requires<[In64BitMode]>;
300
301// No "pop cs" instruction.
302def POPSS16 : I<0x17, RawFrm, (outs), (ins), "pop{w}\t{%ss|ss}", []>,
303              OpSize16, Requires<[Not64BitMode]>;
304def POPSS32 : I<0x17, RawFrm, (outs), (ins), "pop{l}\t{%ss|ss}", []>,
305              OpSize32, Requires<[Not64BitMode]>;
306
307def POPDS16 : I<0x1F, RawFrm, (outs), (ins), "pop{w}\t{%ds|ds}", []>,
308              OpSize16, Requires<[Not64BitMode]>;
309def POPDS32 : I<0x1F, RawFrm, (outs), (ins), "pop{l}\t{%ds|ds}", []>,
310              OpSize32, Requires<[Not64BitMode]>;
311
312def POPES16 : I<0x07, RawFrm, (outs), (ins), "pop{w}\t{%es|es}", []>,
313              OpSize16, Requires<[Not64BitMode]>;
314def POPES32 : I<0x07, RawFrm, (outs), (ins), "pop{l}\t{%es|es}", []>,
315              OpSize32, Requires<[Not64BitMode]>;
316
317def POPFS16 : I<0xa1, RawFrm, (outs), (ins), "pop{w}\t{%fs|fs}", []>,
318                OpSize16, TB;
319def POPFS32 : I<0xa1, RawFrm, (outs), (ins), "pop{l}\t{%fs|fs}", []>, TB,
320                OpSize32, Requires<[Not64BitMode]>;
321def POPFS64 : I<0xa1, RawFrm, (outs), (ins), "pop{q}\t{%fs|fs}", []>, TB,
322                OpSize32, Requires<[In64BitMode]>;
323
324def POPGS16 : I<0xa9, RawFrm, (outs), (ins), "pop{w}\t{%gs|gs}", []>,
325                OpSize16, TB;
326def POPGS32 : I<0xa9, RawFrm, (outs), (ins), "pop{l}\t{%gs|gs}", []>, TB,
327                OpSize32, Requires<[Not64BitMode]>;
328def POPGS64 : I<0xa9, RawFrm, (outs), (ins), "pop{q}\t{%gs|gs}", []>, TB,
329                OpSize32, Requires<[In64BitMode]>;
330
331def LDS16rm : I<0xc5, MRMSrcMem, (outs GR16:$dst), (ins opaquemem:$src),
332                "lds{w}\t{$src, $dst|$dst, $src}", []>, OpSize16,
333                Requires<[Not64BitMode]>;
334def LDS32rm : I<0xc5, MRMSrcMem, (outs GR32:$dst), (ins opaquemem:$src),
335                "lds{l}\t{$src, $dst|$dst, $src}", []>, OpSize32,
336                Requires<[Not64BitMode]>;
337
338def LSS16rm : I<0xb2, MRMSrcMem, (outs GR16:$dst), (ins opaquemem:$src),
339                "lss{w}\t{$src, $dst|$dst, $src}", []>, TB, OpSize16;
340def LSS32rm : I<0xb2, MRMSrcMem, (outs GR32:$dst), (ins opaquemem:$src),
341                "lss{l}\t{$src, $dst|$dst, $src}", []>, TB, OpSize32;
342def LSS64rm : RI<0xb2, MRMSrcMem, (outs GR64:$dst), (ins opaquemem:$src),
343                 "lss{q}\t{$src, $dst|$dst, $src}", []>, TB;
344
345def LES16rm : I<0xc4, MRMSrcMem, (outs GR16:$dst), (ins opaquemem:$src),
346                "les{w}\t{$src, $dst|$dst, $src}", []>, OpSize16,
347                Requires<[Not64BitMode]>;
348def LES32rm : I<0xc4, MRMSrcMem, (outs GR32:$dst), (ins opaquemem:$src),
349                "les{l}\t{$src, $dst|$dst, $src}", []>, OpSize32,
350                Requires<[Not64BitMode]>;
351
352def LFS16rm : I<0xb4, MRMSrcMem, (outs GR16:$dst), (ins opaquemem:$src),
353                "lfs{w}\t{$src, $dst|$dst, $src}", []>, TB, OpSize16;
354def LFS32rm : I<0xb4, MRMSrcMem, (outs GR32:$dst), (ins opaquemem:$src),
355                "lfs{l}\t{$src, $dst|$dst, $src}", []>, TB, OpSize32;
356def LFS64rm : RI<0xb4, MRMSrcMem, (outs GR64:$dst), (ins opaquemem:$src),
357                 "lfs{q}\t{$src, $dst|$dst, $src}", []>, TB;
358
359def LGS16rm : I<0xb5, MRMSrcMem, (outs GR16:$dst), (ins opaquemem:$src),
360                "lgs{w}\t{$src, $dst|$dst, $src}", []>, TB, OpSize16;
361def LGS32rm : I<0xb5, MRMSrcMem, (outs GR32:$dst), (ins opaquemem:$src),
362                "lgs{l}\t{$src, $dst|$dst, $src}", []>, TB, OpSize32;
363
364def LGS64rm : RI<0xb5, MRMSrcMem, (outs GR64:$dst), (ins opaquemem:$src),
365                 "lgs{q}\t{$src, $dst|$dst, $src}", []>, TB;
366
367def VERRr : I<0x00, MRM4r, (outs), (ins GR16:$seg), "verr\t$seg", []>, TB;
368def VERWr : I<0x00, MRM5r, (outs), (ins GR16:$seg), "verw\t$seg", []>, TB;
369let mayLoad = 1 in {
370def VERRm : I<0x00, MRM4m, (outs), (ins i16mem:$seg), "verr\t$seg", []>, TB;
371def VERWm : I<0x00, MRM5m, (outs), (ins i16mem:$seg), "verw\t$seg", []>, TB;
372}
373} // SchedRW
374
375//===----------------------------------------------------------------------===//
376// Descriptor-table support instructions
377
378let SchedRW = [WriteSystem] in {
379def SGDT16m : I<0x01, MRM0m, (outs), (ins opaquemem:$dst),
380                "sgdtw\t$dst", []>, TB, OpSize16, Requires<[Not64BitMode]>;
381def SGDT32m : I<0x01, MRM0m, (outs), (ins opaquemem:$dst),
382                "sgdt{l|d}\t$dst", []>, OpSize32, TB, Requires <[Not64BitMode]>;
383def SGDT64m : I<0x01, MRM0m, (outs), (ins opaquemem:$dst),
384                "sgdt{q}\t$dst", []>, TB, Requires <[In64BitMode]>;
385def SIDT16m : I<0x01, MRM1m, (outs), (ins opaquemem:$dst),
386                "sidtw\t$dst", []>, TB, OpSize16, Requires<[Not64BitMode]>;
387def SIDT32m : I<0x01, MRM1m, (outs), (ins opaquemem:$dst),
388                "sidt{l|d}\t$dst", []>, OpSize32, TB, Requires <[Not64BitMode]>;
389def SIDT64m : I<0x01, MRM1m, (outs), (ins opaquemem:$dst),
390                "sidt{q}\t$dst", []>, TB, Requires <[In64BitMode]>;
391def SLDT16r : I<0x00, MRM0r, (outs GR16:$dst), (ins),
392                "sldt{w}\t$dst", []>, TB, OpSize16;
393let mayStore = 1 in
394def SLDT16m : I<0x00, MRM0m, (outs), (ins i16mem:$dst),
395                "sldt{w}\t$dst", []>, TB;
396def SLDT32r : I<0x00, MRM0r, (outs GR32:$dst), (ins),
397                "sldt{l}\t$dst", []>, OpSize32, TB;
398
399// LLDT is not interpreted specially in 64-bit mode because there is no sign
400//   extension.
401def SLDT64r : RI<0x00, MRM0r, (outs GR64:$dst), (ins),
402                 "sldt{q}\t$dst", []>, TB, Requires<[In64BitMode]>;
403
404def LGDT16m : I<0x01, MRM2m, (outs), (ins opaquemem:$src),
405                "lgdtw\t$src", []>, TB, OpSize16, Requires<[Not64BitMode]>;
406def LGDT32m : I<0x01, MRM2m, (outs), (ins opaquemem:$src),
407                "lgdt{l|d}\t$src", []>, OpSize32, TB, Requires<[Not64BitMode]>;
408def LGDT64m : I<0x01, MRM2m, (outs), (ins opaquemem:$src),
409                "lgdt{q}\t$src", []>, TB, Requires<[In64BitMode]>;
410def LIDT16m : I<0x01, MRM3m, (outs), (ins opaquemem:$src),
411                "lidtw\t$src", []>, TB, OpSize16, Requires<[Not64BitMode]>;
412def LIDT32m : I<0x01, MRM3m, (outs), (ins opaquemem:$src),
413                "lidt{l|d}\t$src", []>, OpSize32, TB, Requires<[Not64BitMode]>;
414def LIDT64m : I<0x01, MRM3m, (outs), (ins opaquemem:$src),
415                "lidt{q}\t$src", []>, TB, Requires<[In64BitMode]>;
416def LLDT16r : I<0x00, MRM2r, (outs), (ins GR16:$src),
417                "lldt{w}\t$src", []>, TB;
418let mayLoad = 1 in
419def LLDT16m : I<0x00, MRM2m, (outs), (ins i16mem:$src),
420                "lldt{w}\t$src", []>, TB;
421} // SchedRW
422
423//===----------------------------------------------------------------------===//
424// Specialized register support
425let SchedRW = [WriteSystem] in {
426let Uses = [EAX, ECX, EDX] in
427def WRMSR : I<0x30, RawFrm, (outs), (ins), "wrmsr", []>, TB;
428let Uses = [EAX, ECX, EDX] in
429def WRMSRNS : I<0x01, MRM_C6, (outs), (ins), "wrmsrns", []>, PS;
430let Defs = [EAX, EDX], Uses = [ECX] in
431def RDMSR : I<0x32, RawFrm, (outs), (ins), "rdmsr", []>, TB;
432let Defs = [RAX, EFLAGS], Uses = [RBX, RCX], Predicates = [In64BitMode] in
433def PBNDKB : I<0x01, MRM_C7, (outs), (ins), "pbndkb", []>, PS;
434let Uses = [RSI, RDI, RCX], Predicates = [In64BitMode] in {
435def WRMSRLIST : I<0x01, MRM_C6, (outs), (ins), "wrmsrlist", []>, XS;
436def RDMSRLIST : I<0x01, MRM_C6, (outs), (ins), "rdmsrlist", []>, XD;
437}
438
439let Defs = [RAX, RDX], Uses = [ECX] in
440def RDPMC : I<0x33, RawFrm, (outs), (ins), "rdpmc", []>, TB;
441
442def SMSW16r : I<0x01, MRM4r, (outs GR16:$dst), (ins),
443                "smsw{w}\t$dst", []>, OpSize16, TB;
444def SMSW32r : I<0x01, MRM4r, (outs GR32:$dst), (ins),
445                "smsw{l}\t$dst", []>, OpSize32, TB;
446// no m form encodable; use SMSW16m
447def SMSW64r : RI<0x01, MRM4r, (outs GR64:$dst), (ins),
448                 "smsw{q}\t$dst", []>, TB;
449
450// For memory operands, there is only a 16-bit form
451def SMSW16m : I<0x01, MRM4m, (outs), (ins i16mem:$dst),
452                "smsw{w}\t$dst", []>, TB;
453
454def LMSW16r : I<0x01, MRM6r, (outs), (ins GR16:$src),
455                "lmsw{w}\t$src", []>, TB;
456let mayLoad = 1 in
457def LMSW16m : I<0x01, MRM6m, (outs), (ins i16mem:$src),
458                "lmsw{w}\t$src", []>, TB;
459
460let Defs = [EAX, EBX, ECX, EDX], Uses = [EAX, ECX] in
461  def CPUID : I<0xA2, RawFrm, (outs), (ins), "cpuid", []>, TB;
462} // SchedRW
463
464//===----------------------------------------------------------------------===//
465// Cache instructions
466let SchedRW = [WriteSystem] in {
467def INVD : I<0x08, RawFrm, (outs), (ins), "invd", []>, TB;
468def WBINVD : I<0x09, RawFrm, (outs), (ins), "wbinvd", [(int_x86_wbinvd)]>, PS;
469
470// wbnoinvd is like wbinvd, except without invalidation
471// encoding: like wbinvd + an 0xF3 prefix
472def WBNOINVD : I<0x09, RawFrm, (outs), (ins), "wbnoinvd",
473                 [(int_x86_wbnoinvd)]>, XS,
474                 Requires<[HasWBNOINVD]>;
475} // SchedRW
476
477//===----------------------------------------------------------------------===//
478// CET instructions
479// Use with caution, availability is not predicated on features.
480let SchedRW = [WriteSystem] in {
481  let Uses = [SSP] in {
482    let Defs = [SSP] in {
483      def INCSSPD : I<0xAE, MRM5r, (outs), (ins GR32:$src), "incsspd\t$src",
484                       [(int_x86_incsspd GR32:$src)]>, XS;
485      def INCSSPQ : RI<0xAE, MRM5r, (outs), (ins GR64:$src), "incsspq\t$src",
486                       [(int_x86_incsspq GR64:$src)]>, XS;
487    } // Defs SSP
488
489    let Constraints = "$src = $dst" in {
490      def RDSSPD : I<0x1E, MRM1r, (outs GR32:$dst), (ins GR32:$src),
491                     "rdsspd\t$dst",
492                     [(set GR32:$dst, (int_x86_rdsspd GR32:$src))]>, XS;
493      def RDSSPQ : RI<0x1E, MRM1r, (outs GR64:$dst), (ins GR64:$src),
494                     "rdsspq\t$dst",
495                     [(set GR64:$dst, (int_x86_rdsspq GR64:$src))]>, XS;
496    }
497
498    let Defs = [SSP] in {
499      def SAVEPREVSSP : I<0x01, MRM_EA, (outs), (ins), "saveprevssp",
500                       [(int_x86_saveprevssp)]>, XS;
501      def RSTORSSP : I<0x01, MRM5m, (outs), (ins i32mem:$src),
502                       "rstorssp\t$src",
503                       [(int_x86_rstorssp addr:$src)]>, XS;
504    } // Defs SSP
505  } // Uses SSP
506
507  def WRSSD : I<0xF6, MRMDestMem, (outs), (ins i32mem:$dst, GR32:$src),
508                "wrssd\t{$src, $dst|$dst, $src}",
509                [(int_x86_wrssd GR32:$src, addr:$dst)]>, T8PS;
510  def WRSSQ : RI<0xF6, MRMDestMem, (outs), (ins i64mem:$dst, GR64:$src),
511                 "wrssq\t{$src, $dst|$dst, $src}",
512                 [(int_x86_wrssq GR64:$src, addr:$dst)]>, T8PS;
513  def WRUSSD : I<0xF5, MRMDestMem, (outs), (ins i32mem:$dst, GR32:$src),
514                 "wrussd\t{$src, $dst|$dst, $src}",
515                 [(int_x86_wrussd GR32:$src, addr:$dst)]>, T8PD;
516  def WRUSSQ : RI<0xF5, MRMDestMem, (outs), (ins i64mem:$dst, GR64:$src),
517                  "wrussq\t{$src, $dst|$dst, $src}",
518                  [(int_x86_wrussq GR64:$src, addr:$dst)]>, T8PD;
519
520  let Defs = [SSP] in {
521    let Uses = [SSP] in {
522        def SETSSBSY : I<0x01, MRM_E8, (outs), (ins), "setssbsy",
523                         [(int_x86_setssbsy)]>, XS;
524    } // Uses SSP
525
526    def CLRSSBSY : I<0xAE, MRM6m, (outs), (ins i32mem:$src),
527                     "clrssbsy\t$src",
528                     [(int_x86_clrssbsy addr:$src)]>, XS;
529  } // Defs SSP
530} // SchedRW
531
532let SchedRW = [WriteSystem] in {
533    def ENDBR64 : I<0x1E, MRM_FA, (outs), (ins), "endbr64", []>, XS;
534    def ENDBR32 : I<0x1E, MRM_FB, (outs), (ins), "endbr32", []>, XS;
535} // SchedRW
536
537//===----------------------------------------------------------------------===//
538// XSAVE instructions
539let SchedRW = [WriteSystem] in {
540// NOTE: No HasXSAVE predicate so that these can be used with _xgetbv/_xsetbv
541// on Windows without needing to enable the xsave feature to be compatible with
542// MSVC.
543let Defs = [EDX, EAX], Uses = [ECX] in
544def XGETBV : I<0x01, MRM_D0, (outs), (ins), "xgetbv", []>, PS;
545
546let Uses = [EDX, EAX, ECX] in
547def XSETBV : I<0x01, MRM_D1, (outs), (ins),
548              "xsetbv",
549              [(int_x86_xsetbv ECX, EDX, EAX)]>, PS;
550
551
552let Uses = [EDX, EAX] in {
553def XSAVE : I<0xAE, MRM4m, (outs), (ins opaquemem:$dst),
554              "xsave\t$dst",
555              [(int_x86_xsave addr:$dst, EDX, EAX)]>, PS, Requires<[HasXSAVE]>;
556def XSAVE64 : RI<0xAE, MRM4m, (outs), (ins opaquemem:$dst),
557                 "xsave64\t$dst",
558                 [(int_x86_xsave64 addr:$dst, EDX, EAX)]>, PS, Requires<[HasXSAVE, In64BitMode]>;
559def XRSTOR : I<0xAE, MRM5m, (outs), (ins opaquemem:$dst),
560               "xrstor\t$dst",
561               [(int_x86_xrstor addr:$dst, EDX, EAX)]>, PS, Requires<[HasXSAVE]>;
562def XRSTOR64 : RI<0xAE, MRM5m, (outs), (ins opaquemem:$dst),
563                  "xrstor64\t$dst",
564                  [(int_x86_xrstor64 addr:$dst, EDX, EAX)]>, PS, Requires<[HasXSAVE, In64BitMode]>;
565def XSAVEOPT : I<0xAE, MRM6m, (outs), (ins opaquemem:$dst),
566                 "xsaveopt\t$dst",
567                 [(int_x86_xsaveopt addr:$dst, EDX, EAX)]>, PS, Requires<[HasXSAVEOPT]>;
568def XSAVEOPT64 : RI<0xAE, MRM6m, (outs), (ins opaquemem:$dst),
569                    "xsaveopt64\t$dst",
570                    [(int_x86_xsaveopt64 addr:$dst, EDX, EAX)]>, PS, Requires<[HasXSAVEOPT, In64BitMode]>;
571def XSAVEC : I<0xC7, MRM4m, (outs), (ins opaquemem:$dst),
572               "xsavec\t$dst",
573               [(int_x86_xsavec addr:$dst, EDX, EAX)]>, PS, Requires<[HasXSAVEC]>;
574def XSAVEC64 : RI<0xC7, MRM4m, (outs), (ins opaquemem:$dst),
575                 "xsavec64\t$dst",
576                 [(int_x86_xsavec64 addr:$dst, EDX, EAX)]>, PS, Requires<[HasXSAVEC, In64BitMode]>;
577def XSAVES : I<0xC7, MRM5m, (outs), (ins opaquemem:$dst),
578               "xsaves\t$dst",
579               [(int_x86_xsaves addr:$dst, EDX, EAX)]>, PS, Requires<[HasXSAVES]>;
580def XSAVES64 : RI<0xC7, MRM5m, (outs), (ins opaquemem:$dst),
581                  "xsaves64\t$dst",
582                  [(int_x86_xsaves64 addr:$dst, EDX, EAX)]>, PS, Requires<[HasXSAVE, In64BitMode]>;
583def XRSTORS : I<0xC7, MRM3m, (outs), (ins opaquemem:$dst),
584                "xrstors\t$dst",
585                [(int_x86_xrstors addr:$dst, EDX, EAX)]>, PS, Requires<[HasXSAVES]>;
586def XRSTORS64 : RI<0xC7, MRM3m, (outs), (ins opaquemem:$dst),
587                   "xrstors64\t$dst",
588                   [(int_x86_xrstors64 addr:$dst, EDX, EAX)]>, PS, Requires<[HasXSAVES, In64BitMode]>;
589} // Uses
590} // SchedRW
591
592//===----------------------------------------------------------------------===//
593// VIA PadLock crypto instructions
594let Defs = [RAX, RDI], Uses = [RDX, RDI], SchedRW = [WriteSystem] in
595  def XSTORE : I<0xa7, MRM_C0, (outs), (ins), "xstore", []>, TB;
596
597def : InstAlias<"xstorerng", (XSTORE)>;
598
599let SchedRW = [WriteSystem] in {
600let Defs = [RSI, RDI], Uses = [RBX, RDX, RSI, RDI] in {
601  def XCRYPTECB : I<0xa7, MRM_C8, (outs), (ins), "xcryptecb", []>, TB, REP;
602  def XCRYPTCBC : I<0xa7, MRM_D0, (outs), (ins), "xcryptcbc", []>, TB, REP;
603  def XCRYPTCTR : I<0xa7, MRM_D8, (outs), (ins), "xcryptctr", []>, TB, REP;
604  def XCRYPTCFB : I<0xa7, MRM_E0, (outs), (ins), "xcryptcfb", []>, TB, REP;
605  def XCRYPTOFB : I<0xa7, MRM_E8, (outs), (ins), "xcryptofb", []>, TB, REP;
606}
607
608let Defs = [RAX, RSI, RDI], Uses = [RAX, RSI, RDI] in {
609  def XSHA1 : I<0xa6, MRM_C8, (outs), (ins), "xsha1", []>, TB, REP;
610  def XSHA256 : I<0xa6, MRM_D0, (outs), (ins), "xsha256", []>, TB, REP;
611}
612let Defs = [RAX, RDX, RSI], Uses = [RAX, RSI] in
613  def MONTMUL : I<0xa6, MRM_C0, (outs), (ins), "montmul", []>, TB, REP;
614} // SchedRW
615
616//==-----------------------------------------------------------------------===//
617// PKU  - enable protection key
618let SchedRW = [WriteSystem] in {
619let Defs = [EAX, EDX], Uses = [ECX] in
620  def RDPKRUr : I<0x01, MRM_EE, (outs), (ins), "rdpkru",
621                  [(set EAX, (X86rdpkru ECX)), (implicit EDX)]>, PS;
622let Uses = [EAX, ECX, EDX] in
623  def WRPKRUr : I<0x01, MRM_EF, (outs), (ins), "wrpkru",
624                  [(X86wrpkru EAX, EDX, ECX)]>, PS;
625} // SchedRW
626
627//===----------------------------------------------------------------------===//
628// FS/GS Base Instructions
629let Predicates = [HasFSGSBase, In64BitMode], SchedRW = [WriteSystem] in {
630  def RDFSBASE : I<0xAE, MRM0r, (outs GR32:$dst), (ins),
631                   "rdfsbase{l}\t$dst",
632                   [(set GR32:$dst, (int_x86_rdfsbase_32))]>, XS;
633  def RDFSBASE64 : RI<0xAE, MRM0r, (outs GR64:$dst), (ins),
634                     "rdfsbase{q}\t$dst",
635                     [(set GR64:$dst, (int_x86_rdfsbase_64))]>, XS;
636  def RDGSBASE : I<0xAE, MRM1r, (outs GR32:$dst), (ins),
637                   "rdgsbase{l}\t$dst",
638                   [(set GR32:$dst, (int_x86_rdgsbase_32))]>, XS;
639  def RDGSBASE64 : RI<0xAE, MRM1r, (outs GR64:$dst), (ins),
640                     "rdgsbase{q}\t$dst",
641                     [(set GR64:$dst, (int_x86_rdgsbase_64))]>, XS;
642  def WRFSBASE : I<0xAE, MRM2r, (outs), (ins GR32:$src),
643                   "wrfsbase{l}\t$src",
644                   [(int_x86_wrfsbase_32 GR32:$src)]>, XS;
645  def WRFSBASE64 : RI<0xAE, MRM2r, (outs), (ins GR64:$src),
646                      "wrfsbase{q}\t$src",
647                      [(int_x86_wrfsbase_64 GR64:$src)]>, XS;
648  def WRGSBASE : I<0xAE, MRM3r, (outs), (ins GR32:$src),
649                   "wrgsbase{l}\t$src",
650                   [(int_x86_wrgsbase_32 GR32:$src)]>, XS;
651  def WRGSBASE64 : RI<0xAE, MRM3r, (outs), (ins GR64:$src),
652                      "wrgsbase{q}\t$src",
653                      [(int_x86_wrgsbase_64 GR64:$src)]>, XS;
654}
655
656//===----------------------------------------------------------------------===//
657// INVPCID Instruction
658let SchedRW = [WriteSystem] in {
659def INVPCID32 : I<0x82, MRMSrcMem, (outs), (ins GR32:$src1, i128mem:$src2),
660                  "invpcid\t{$src2, $src1|$src1, $src2}",
661                  [(int_x86_invpcid GR32:$src1, addr:$src2)]>, T8PD,
662                  Requires<[Not64BitMode, HasINVPCID]>;
663def INVPCID64 : I<0x82, MRMSrcMem, (outs), (ins GR64:$src1, i128mem:$src2),
664                  "invpcid\t{$src2, $src1|$src1, $src2}", []>, T8PD,
665                  Requires<[In64BitMode, HasINVPCID]>;
666} // SchedRW
667
668let Predicates = [In64BitMode, HasINVPCID] in {
669  // The instruction can only use a 64 bit register as the register argument
670  // in 64 bit mode, while the intrinsic only accepts a 32 bit argument
671  // corresponding to it.
672  // The accepted values for now are 0,1,2,3 anyways (see Intel SDM -- INVCPID
673  // type),/ so it doesn't hurt us that one can't supply a 64 bit value here.
674  def : Pat<(int_x86_invpcid GR32:$src1, addr:$src2),
675            (INVPCID64
676              (SUBREG_TO_REG (i64 0), (MOV32rr GR32:$src1), sub_32bit),
677              addr:$src2)>;
678}
679
680
681//===----------------------------------------------------------------------===//
682// SMAP Instruction
683let Defs = [EFLAGS], SchedRW = [WriteSystem] in {
684  def CLAC : I<0x01, MRM_CA, (outs), (ins), "clac", []>, PS;
685  def STAC : I<0x01, MRM_CB, (outs), (ins), "stac", []>, PS;
686}
687
688//===----------------------------------------------------------------------===//
689// SMX Instruction
690let SchedRW = [WriteSystem] in {
691let Uses = [RAX, RBX, RCX, RDX], Defs = [RAX, RBX, RCX] in {
692  def GETSEC : I<0x37, RawFrm, (outs), (ins), "getsec", []>, PS;
693} // Uses, Defs
694} // SchedRW
695
696//===----------------------------------------------------------------------===//
697// TS flag control instruction.
698let SchedRW = [WriteSystem] in {
699def CLTS : I<0x06, RawFrm, (outs), (ins), "clts", []>, TB;
700}
701
702//===----------------------------------------------------------------------===//
703// IF (inside EFLAGS) management instructions.
704let SchedRW = [WriteSystem], Uses = [EFLAGS], Defs = [EFLAGS] in {
705def CLI : I<0xFA, RawFrm, (outs), (ins), "cli", []>;
706def STI : I<0xFB, RawFrm, (outs), (ins), "sti", []>;
707}
708
709//===----------------------------------------------------------------------===//
710// RDPID Instruction
711let SchedRW = [WriteSystem] in {
712def RDPID32 : I<0xC7, MRM7r, (outs GR32:$dst), (ins),
713                "rdpid\t$dst", [(set GR32:$dst, (int_x86_rdpid))]>, XS,
714                Requires<[Not64BitMode, HasRDPID]>;
715def RDPID64 : I<0xC7, MRM7r, (outs GR64:$dst), (ins), "rdpid\t$dst", []>, XS,
716                Requires<[In64BitMode, HasRDPID]>;
717} // SchedRW
718
719let Predicates = [In64BitMode, HasRDPID] in {
720  // Due to silly instruction definition, we have to compensate for the
721  // instruction outputing a 64-bit register.
722  def : Pat<(int_x86_rdpid),
723            (EXTRACT_SUBREG (RDPID64), sub_32bit)>;
724}
725
726
727//===----------------------------------------------------------------------===//
728// PTWRITE Instruction - Write Data to a Processor Trace Packet
729let SchedRW = [WriteSystem] in {
730def PTWRITEm: I<0xAE, MRM4m, (outs), (ins i32mem:$dst),
731                "ptwrite{l}\t$dst", [(int_x86_ptwrite32 (loadi32 addr:$dst))]>, XS,
732                Requires<[HasPTWRITE]>;
733def PTWRITE64m : RI<0xAE, MRM4m, (outs), (ins i64mem:$dst),
734                    "ptwrite{q}\t$dst", [(int_x86_ptwrite64 (loadi64 addr:$dst))]>, XS,
735                    Requires<[In64BitMode, HasPTWRITE]>;
736
737def PTWRITEr : I<0xAE, MRM4r, (outs), (ins GR32:$dst),
738                 "ptwrite{l}\t$dst", [(int_x86_ptwrite32 GR32:$dst)]>, XS,
739                    Requires<[HasPTWRITE]>;
740def PTWRITE64r : RI<0xAE, MRM4r, (outs), (ins GR64:$dst),
741                    "ptwrite{q}\t$dst", [(int_x86_ptwrite64 GR64:$dst)]>, XS,
742                    Requires<[In64BitMode, HasPTWRITE]>;
743} // SchedRW
744
745//===----------------------------------------------------------------------===//
746// RDPRU - Read Processor Register instruction.
747
748let SchedRW = [WriteSystem] in {
749let Uses = [ECX], Defs = [EAX, EDX] in
750   def RDPRU : I<0x01, MRM_FD, (outs), (ins), "rdpru", []>, PS,
751               Requires<[HasRDPRU]>;
752}
753
754//===----------------------------------------------------------------------===//
755// Platform Configuration instruction
756
757// From ISA docs:
758//  "This instruction is used to execute functions for configuring platform
759//   features.
760//   EAX: Leaf function to be invoked.
761//   RBX/RCX/RDX: Leaf-specific purpose."
762//  "Successful execution of the leaf clears RAX (set to zero) and ZF, CF, PF,
763//   AF, OF, and SF are cleared. In case of failure, the failure reason is
764//   indicated in RAX with ZF set to 1 and CF, PF, AF, OF, and SF are cleared."
765// Thus all these mentioned registers are considered clobbered.
766
767let SchedRW = [WriteSystem] in {
768let Uses = [RAX, RBX, RCX, RDX], Defs = [RAX, RBX, RCX, RDX, EFLAGS] in
769    def PCONFIG : I<0x01, MRM_C5, (outs), (ins), "pconfig", []>, PS,
770                  Requires<[HasPCONFIG]>;
771} // SchedRW
772