1 //===- Mips16InstrInfo.td - Target Description for Mips16 -*- 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 Mips16 instructions.
12 //===----------------------------------------------------------------------===//
17 def mem16 : Operand<i32> {
18 let PrintMethod = "printMemOperand";
19 let MIOperandInfo = (ops CPU16Regs, simm16);
20 let EncoderMethod = "getMemEncoding";
24 // Compare a register and immediate and place result in CC
27 // EXT-CCRR Instruction format
29 class FEXT_CCRXI16_ins<bits<5> _op, string asmstr,
31 FEXT_RI16<_op, (outs CPU16Regs:$cc), (ins CPU16Regs:$rx, simm16:$imm),
32 !strconcat(asmstr, "\t$rx, $imm\n\tmove\t$cc, $$t8"), [], itin> {
37 // EXT-I instruction format
39 class FEXT_I16_ins<bits<5> eop, string asmstr, InstrItinClass itin> :
40 FEXT_I16<eop, (outs), (ins brtarget:$imm16),
41 !strconcat(asmstr, "\t$imm16"),[], itin>;
44 // EXT-I8 instruction format
47 class FEXT_I816_ins_base<bits<3> _func, string asmstr,
48 string asmstr2, InstrItinClass itin>:
49 FEXT_I816<_func, (outs), (ins uimm16:$imm), !strconcat(asmstr, asmstr2),
52 class FEXT_I816_ins<bits<3> _func, string asmstr,
54 FEXT_I816_ins_base<_func, asmstr, "\t$imm", itin>;
57 // Assembler formats in alphabetical order.
58 // Natural and pseudos are mixed together.
60 // Compare two registers and place result in CC
63 // CC-RR Instruction format
65 class FCCRR16_ins<bits<5> f, string asmstr, InstrItinClass itin> :
66 FRR16<f, (outs CPU16Regs:$cc), (ins CPU16Regs:$rx, CPU16Regs:$ry),
67 !strconcat(asmstr, "\t$rx, $ry\n\tmove\t$cc, $$t8"), [], itin> {
72 // EXT-RI instruction format
75 class FEXT_RI16_ins_base<bits<5> _op, string asmstr, string asmstr2,
77 FEXT_RI16<_op, (outs CPU16Regs:$rx), (ins simm16:$imm),
78 !strconcat(asmstr, asmstr2), [], itin>;
80 class FEXT_RI16_ins<bits<5> _op, string asmstr,
82 FEXT_RI16_ins_base<_op, asmstr, "\t$rx, $imm", itin>;
84 class FEXT_RI16_PC_ins<bits<5> _op, string asmstr, InstrItinClass itin>:
85 FEXT_RI16_ins_base<_op, asmstr, "\t$rx, $$pc, $imm", itin>;
87 class FEXT_RI16_B_ins<bits<5> _op, string asmstr,
89 FEXT_RI16<_op, (outs), (ins CPU16Regs:$rx, brtarget:$imm),
90 !strconcat(asmstr, "\t$rx, $imm"), [], itin>;
92 class FEXT_2RI16_ins<bits<5> _op, string asmstr,
94 FEXT_RI16<_op, (outs CPU16Regs:$rx), (ins CPU16Regs:$rx_, simm16:$imm),
95 !strconcat(asmstr, "\t$rx, $imm"), [], itin> {
96 let Constraints = "$rx_ = $rx";
100 // this has an explicit sp argument that we ignore to work around a problem
102 class FEXT_RI16_SP_explicit_ins<bits<5> _op, string asmstr,
103 InstrItinClass itin>:
104 FEXT_RI16<_op, (outs CPU16Regs:$rx), (ins CPUSPReg:$ry, simm16:$imm),
105 !strconcat(asmstr, "\t$rx, $imm ( $ry ); "), [], itin>;
108 // EXT-RRI instruction format
111 class FEXT_RRI16_mem_ins<bits<5> op, string asmstr, Operand MemOpnd,
112 InstrItinClass itin>:
113 FEXT_RRI16<op, (outs CPU16Regs:$ry), (ins MemOpnd:$addr),
114 !strconcat(asmstr, "\t$ry, $addr"), [], itin>;
116 class FEXT_RRI16_mem2_ins<bits<5> op, string asmstr, Operand MemOpnd,
117 InstrItinClass itin>:
118 FEXT_RRI16<op, (outs ), (ins CPU16Regs:$ry, MemOpnd:$addr),
119 !strconcat(asmstr, "\t$ry, $addr"), [], itin>;
122 // EXT-SHIFT instruction format
124 class FEXT_SHIFT16_ins<bits<2> _f, string asmstr, InstrItinClass itin>:
125 FEXT_SHIFT16<_f, (outs CPU16Regs:$rx), (ins CPU16Regs:$ry, shamt:$sa),
126 !strconcat(asmstr, "\t$rx, $ry, $sa"), [], itin>;
131 class FEXT_T8I816_ins<bits<3> _func, string asmstr, string asmstr2,
132 InstrItinClass itin>:
133 FEXT_I816<_func, (outs),
134 (ins CPU16Regs:$rx, CPU16Regs:$ry, brtarget:$imm),
135 !strconcat(asmstr2, !strconcat("\t$rx, $ry\n\t",
136 !strconcat(asmstr, "\t$imm"))),[], itin> {
143 class FEXT_T8I8I16_ins<bits<3> _func, string asmstr, string asmstr2,
144 InstrItinClass itin>:
145 FEXT_I816<_func, (outs),
146 (ins CPU16Regs:$rx, simm16:$imm, brtarget:$targ),
147 !strconcat(asmstr2, !strconcat("\t$rx, $imm\n\t",
148 !strconcat(asmstr, "\t$targ"))), [], itin> {
155 // I8_MOVR32 instruction format (used only by the MOVR32 instructio
157 class FI8_MOVR3216_ins<string asmstr, InstrItinClass itin>:
158 FI8_MOVR3216<(outs CPU16Regs:$rz), (ins CPURegs:$r32),
159 !strconcat(asmstr, "\t$rz, $r32"), [], itin>;
162 // I8_MOV32R instruction format (used only by MOV32R instruction)
165 class FI8_MOV32R16_ins<string asmstr, InstrItinClass itin>:
166 FI8_MOV32R16<(outs CPURegs:$r32), (ins CPU16Regs:$rz),
167 !strconcat(asmstr, "\t$r32, $rz"), [], itin>;
170 // This are pseudo formats for multiply
171 // This first one can be changed to non pseudo now.
175 class FMULT16_ins<string asmstr, InstrItinClass itin> :
176 MipsPseudo16<(outs), (ins CPU16Regs:$rx, CPU16Regs:$ry),
177 !strconcat(asmstr, "\t$rx, $ry"), []>;
182 class FMULT16_LO_ins<string asmstr, InstrItinClass itin> :
183 MipsPseudo16<(outs CPU16Regs:$rz), (ins CPU16Regs:$rx, CPU16Regs:$ry),
184 !strconcat(asmstr, "\t$rx, $ry\n\tmflo\t$rz"), []> {
189 // RR-type instruction format
192 class FRR16_ins<bits<5> f, string asmstr, InstrItinClass itin> :
193 FRR16<f, (outs CPU16Regs:$rx), (ins CPU16Regs:$ry),
194 !strconcat(asmstr, "\t$rx, $ry"), [], itin> {
198 // maybe refactor but need a $zero as a dummy first parameter
200 class FRR16_div_ins<bits<5> f, string asmstr, InstrItinClass itin> :
201 FRR16<f, (outs ), (ins CPU16Regs:$rx, CPU16Regs:$ry),
202 !strconcat(asmstr, "\t$$zero, $rx, $ry"), [], itin> ;
204 class FRR16_M_ins<bits<5> f, string asmstr,
205 InstrItinClass itin> :
206 FRR16<f, (outs CPU16Regs:$rx), (ins),
207 !strconcat(asmstr, "\t$rx"), [], itin>;
209 class FRxRxRy16_ins<bits<5> f, string asmstr,
210 InstrItinClass itin> :
211 FRR16<f, (outs CPU16Regs:$rz), (ins CPU16Regs:$rx, CPU16Regs:$ry),
212 !strconcat(asmstr, "\t$rz, $ry"),
214 let Constraints = "$rx = $rz";
218 class FRR16_JALRC_RA_only_ins<bits<1> nd_, bits<1> l_,
219 string asmstr, InstrItinClass itin>:
220 FRR16_JALRC<nd_, l_, 1, (outs), (ins), !strconcat(asmstr, "\t $$ra"),
224 // RRR-type instruction format
227 class FRRR16_ins<bits<2> _f, string asmstr, InstrItinClass itin> :
228 FRRR16<_f, (outs CPU16Regs:$rz), (ins CPU16Regs:$rx, CPU16Regs:$ry),
229 !strconcat(asmstr, "\t$rz, $rx, $ry"), [], itin>;
232 // These Sel patterns support the generation of conditional move
233 // pseudo instructions.
235 // The nomenclature uses the components making up the pseudo and may
236 // be a bit counter intuitive when compared with the end result we seek.
237 // For example using a bqez in the example directly below results in the
238 // conditional move being done if the tested register is not zero.
239 // I considered in easier to check by keeping the pseudo consistent with
240 // it's components but it could have been done differently.
242 // The simplest case is when can test and operand directly and do the
243 // conditional move based on a simple mips16 conditional
244 // branch instruction.
246 // if $op == beqz or bnez:
251 // if $op == beqz, then if $rt != 0, then the conditional assignment
252 // $rd = $rs is done.
254 // if $op == bnez, then if $rt == 0, then the conditional assignment
255 // $rd = $rs is done.
257 // So this pseudo class only has one operand, i.e. op
259 class Sel<bits<5> f1, string op, InstrItinClass itin>:
260 MipsInst16_32<(outs CPU16Regs:$rd_), (ins CPU16Regs:$rd, CPU16Regs:$rs,
262 !strconcat(op, "\t$rt, .+4\n\t\n\tmove $rd, $rs"), [], itin,
265 let Constraints = "$rd = $rd_";
269 // The next two instruction classes allow for an operand which tests
270 // two operands and returns a value in register T8 and
271 //then does a conditional branch based on the value of T8
274 // op2 can be cmpi or slti/sltiu
275 // op1 can bteqz or btnez
276 // the operands for op2 are a register and a signed constant
278 // $op2 $t, $imm ;test register t and branch conditionally
279 // $op1 .+4 ;op1 is a conditional branch
283 class SeliT<bits<5> f1, string op1, bits<5> f2, string op2,
284 InstrItinClass itin>:
285 MipsInst16_32<(outs CPU16Regs:$rd_), (ins CPU16Regs:$rd, CPU16Regs:$rs,
286 CPU16Regs:$rl, simm16:$imm),
288 !strconcat("\t$rl, $imm\n\t",
289 !strconcat(op1, "\t.+4\n\tmove $rd, $rs"))), [], itin,
292 let Constraints = "$rd = $rd_";
296 // op2 can be cmp or slt/sltu
297 // op1 can be bteqz or btnez
298 // the operands for op2 are two registers
299 // op1 is a conditional branch
302 // $op2 $rl, $rr ;test registers rl,rr
303 // $op1 .+4 ;op2 is a conditional branch
307 class SelT<bits<5> f1, string op1, bits<5> f2, string op2,
308 InstrItinClass itin>:
309 MipsInst16_32<(outs CPU16Regs:$rd_), (ins CPU16Regs:$rd, CPU16Regs:$rs,
310 CPU16Regs:$rl, CPU16Regs:$rr),
312 !strconcat("\t$rl, $rr\n\t",
313 !strconcat(op1, "\t.+4\n\tmove $rd, $rs"))), [], itin,
316 let Constraints = "$rd = $rd_";
321 // Some general instruction class info
325 class ArithLogic16Defs<bit isCom=0> {
327 bit isCommutable = isCom;
328 bit isReMaterializable = 1;
329 bit neverHasSideEffects = 1;
334 bit isTerminator = 1;
340 bit isTerminator = 1;
352 // Format: ADDIU rx, immediate MIPS16e
353 // Purpose: Add Immediate Unsigned Word (2-Operand, Extended)
354 // To add a constant to a 32-bit integer.
356 def AddiuRxImmX16: FEXT_RI16_ins<0b01001, "addiu", IIAlu>;
358 def AddiuRxRxImmX16: FEXT_2RI16_ins<0b01001, "addiu", IIAlu>,
363 // Format: ADDIU rx, pc, immediate MIPS16e
364 // Purpose: Add Immediate Unsigned Word (3-Operand, PC-Relative, Extended)
365 // To add a constant to the program counter.
367 def AddiuRxPcImmX16: FEXT_RI16_PC_ins<0b00001, "addiu", IIAlu>;
369 // Format: ADDU rz, rx, ry MIPS16e
370 // Purpose: Add Unsigned Word (3-Operand)
371 // To add 32-bit integers.
374 def AdduRxRyRz16: FRRR16_ins<01, "addu", IIAlu>, ArithLogic16Defs<1>;
377 // Format: AND rx, ry MIPS16e
379 // To do a bitwise logical AND.
381 def AndRxRxRy16: FRxRxRy16_ins<0b01100, "and", IIAlu>, ArithLogic16Defs<1>;
385 // Format: BEQZ rx, offset MIPS16e
386 // Purpose: Branch on Equal to Zero (Extended)
387 // To test a GPR then do a PC-relative conditional branch.
389 def BeqzRxImmX16: FEXT_RI16_B_ins<0b00100, "beqz", IIAlu>, cbranch16;
391 // Format: B offset MIPS16e
392 // Purpose: Unconditional Branch
393 // To do an unconditional PC-relative branch.
395 def BimmX16: FEXT_I16_ins<0b00010, "b", IIAlu>, branch16;
398 // Format: BNEZ rx, offset MIPS16e
399 // Purpose: Branch on Not Equal to Zero (Extended)
400 // To test a GPR then do a PC-relative conditional branch.
402 def BnezRxImmX16: FEXT_RI16_B_ins<0b00101, "bnez", IIAlu>, cbranch16;
405 // Format: BTEQZ offset MIPS16e
406 // Purpose: Branch on T Equal to Zero (Extended)
407 // To test special register T then do a PC-relative conditional branch.
409 def BteqzX16: FEXT_I816_ins<0b000, "bteqz", IIAlu>, cbranch16;
411 def BteqzT8CmpX16: FEXT_T8I816_ins<0b000, "bteqz", "cmp", IIAlu>, cbranch16;
413 def BteqzT8CmpiX16: FEXT_T8I8I16_ins<0b000, "bteqz", "cmpi", IIAlu>,
416 def BteqzT8SltX16: FEXT_T8I816_ins<0b000, "bteqz", "slt", IIAlu>, cbranch16;
418 def BteqzT8SltuX16: FEXT_T8I816_ins<0b000, "bteqz", "sltu", IIAlu>, cbranch16;
420 def BteqzT8SltiX16: FEXT_T8I8I16_ins<0b000, "bteqz", "slti", IIAlu>, cbranch16;
422 def BteqzT8SltiuX16: FEXT_T8I8I16_ins<0b000, "bteqz", "sltiu", IIAlu>,
426 // Format: BTNEZ offset MIPS16e
427 // Purpose: Branch on T Not Equal to Zero (Extended)
428 // To test special register T then do a PC-relative conditional branch.
430 def BtnezX16: FEXT_I816_ins<0b001, "btnez", IIAlu> ,cbranch16;
432 def BtnezT8CmpX16: FEXT_T8I816_ins<0b000, "btnez", "cmp", IIAlu>, cbranch16;
434 def BtnezT8CmpiX16: FEXT_T8I8I16_ins<0b000, "btnez", "cmpi", IIAlu>, cbranch16;
436 def BtnezT8SltX16: FEXT_T8I816_ins<0b000, "btnez", "slt", IIAlu>, cbranch16;
438 def BtnezT8SltuX16: FEXT_T8I816_ins<0b000, "btnez", "sltu", IIAlu>, cbranch16;
440 def BtnezT8SltiX16: FEXT_T8I8I16_ins<0b000, "btnez", "slti", IIAlu>, cbranch16;
442 def BtnezT8SltiuX16: FEXT_T8I8I16_ins<0b000, "btnez", "sltiu", IIAlu>,
446 // Format: DIV rx, ry MIPS16e
447 // Purpose: Divide Word
448 // To divide 32-bit signed integers.
450 def DivRxRy16: FRR16_div_ins<0b11010, "div", IIAlu> {
455 // Format: DIVU rx, ry MIPS16e
456 // Purpose: Divide Unsigned Word
457 // To divide 32-bit unsigned integers.
459 def DivuRxRy16: FRR16_div_ins<0b11011, "divu", IIAlu> {
465 // Format: JR ra MIPS16e
466 // Purpose: Jump Register Through Register ra
467 // To execute a branch to the instruction address in the return
471 def JrRa16: FRR16_JALRC_RA_only_ins<0, 0, "jr", IIAlu>;
474 // Format: LB ry, offset(rx) MIPS16e
475 // Purpose: Load Byte (Extended)
476 // To load a byte from memory as a signed value.
478 def LbRxRyOffMemX16: FEXT_RRI16_mem_ins<0b10011, "lb", mem16, IILoad>, MayLoad;
481 // Format: LBU ry, offset(rx) MIPS16e
482 // Purpose: Load Byte Unsigned (Extended)
483 // To load a byte from memory as a unsigned value.
485 def LbuRxRyOffMemX16:
486 FEXT_RRI16_mem_ins<0b10100, "lbu", mem16, IILoad>, MayLoad;
489 // Format: LH ry, offset(rx) MIPS16e
490 // Purpose: Load Halfword signed (Extended)
491 // To load a halfword from memory as a signed value.
493 def LhRxRyOffMemX16: FEXT_RRI16_mem_ins<0b10100, "lh", mem16, IILoad>, MayLoad;
496 // Format: LHU ry, offset(rx) MIPS16e
497 // Purpose: Load Halfword unsigned (Extended)
498 // To load a halfword from memory as an unsigned value.
500 def LhuRxRyOffMemX16:
501 FEXT_RRI16_mem_ins<0b10100, "lhu", mem16, IILoad>, MayLoad;
504 // Format: LI rx, immediate MIPS16e
505 // Purpose: Load Immediate (Extended)
506 // To load a constant into a GPR.
508 def LiRxImmX16: FEXT_RI16_ins<0b01101, "li", IIAlu>;
511 // Format: LW ry, offset(rx) MIPS16e
512 // Purpose: Load Word (Extended)
513 // To load a word from memory as a signed value.
515 def LwRxRyOffMemX16: FEXT_RRI16_mem_ins<0b10011, "lw", mem16, IILoad>, MayLoad;
517 // Format: LW rx, offset(sp) MIPS16e
518 // Purpose: Load Word (SP-Relative, Extended)
519 // To load an SP-relative word from memory as a signed value.
521 def LwRxSpImmX16: FEXT_RI16_SP_explicit_ins<0b10110, "lw", IILoad>, MayLoad;
524 // Format: MOVE r32, rz MIPS16e
526 // To move the contents of a GPR to a GPR.
528 def Move32R16: FI8_MOV32R16_ins<"move", IIAlu>;
531 // Format: MOVE ry, r32 MIPS16e
533 // To move the contents of a GPR to a GPR.
535 def MoveR3216: FI8_MOVR3216_ins<"move", IIAlu>;
538 // Format: MFHI rx MIPS16e
539 // Purpose: Move From HI Register
540 // To copy the special purpose HI register to a GPR.
542 def Mfhi16: FRR16_M_ins<0b10000, "mfhi", IIAlu> {
544 let neverHasSideEffects = 1;
548 // Format: MFLO rx MIPS16e
549 // Purpose: Move From LO Register
550 // To copy the special purpose LO register to a GPR.
552 def Mflo16: FRR16_M_ins<0b10010, "mflo", IIAlu> {
554 let neverHasSideEffects = 1;
558 // Pseudo Instruction for mult
560 def MultRxRy16: FMULT16_ins<"mult", IIAlu> {
561 let isCommutable = 1;
562 let neverHasSideEffects = 1;
566 def MultuRxRy16: FMULT16_ins<"multu", IIAlu> {
567 let isCommutable = 1;
568 let neverHasSideEffects = 1;
573 // Format: MULT rx, ry MIPS16e
574 // Purpose: Multiply Word
575 // To multiply 32-bit signed integers.
577 def MultRxRyRz16: FMULT16_LO_ins<"mult", IIAlu> {
578 let isCommutable = 1;
579 let neverHasSideEffects = 1;
584 // Format: MULTU rx, ry MIPS16e
585 // Purpose: Multiply Unsigned Word
586 // To multiply 32-bit unsigned integers.
588 def MultuRxRyRz16: FMULT16_LO_ins<"multu", IIAlu> {
589 let isCommutable = 1;
590 let neverHasSideEffects = 1;
595 // Format: NEG rx, ry MIPS16e
597 // To negate an integer value.
599 def NegRxRy16: FRR16_ins<0b11101, "neg", IIAlu>;
602 // Format: NOT rx, ry MIPS16e
604 // To complement an integer value
606 def NotRxRy16: FRR16_ins<0b01111, "not", IIAlu>;
609 // Format: OR rx, ry MIPS16e
611 // To do a bitwise logical OR.
613 def OrRxRxRy16: FRxRxRy16_ins<0b01101, "or", IIAlu>, ArithLogic16Defs<1>;
616 // Format: RESTORE {ra,}{s0/s1/s0-1,}{framesize}
617 // (All args are optional) MIPS16e
618 // Purpose: Restore Registers and Deallocate Stack Frame
619 // To deallocate a stack frame before exit from a subroutine,
620 // restoring return address and static registers, and adjusting
624 // fixed form for restoring RA and the frame
625 // for direct object emitter, encoding needs to be adjusted for the
628 let ra=1, s=0,s0=1,s1=1 in
630 FI8_SVRS16<0b1, (outs), (ins uimm16:$frame_size),
631 "restore \t$$ra, $$s0, $$s1, $frame_size", [], IILoad >, MayLoad {
632 let isCodeGenOnly = 1;
636 // Format: SAVE {ra,}{s0/s1/s0-1,}{framesize} (All arguments are optional)
638 // Purpose: Save Registers and Set Up Stack Frame
639 // To set up a stack frame on entry to a subroutine,
640 // saving return address and static registers, and adjusting stack
642 let ra=1, s=1,s0=1,s1=1 in
644 FI8_SVRS16<0b1, (outs), (ins uimm16:$frame_size),
645 "save \t$$ra, $$s0, $$s1, $frame_size", [], IIStore >, MayStore {
646 let isCodeGenOnly = 1;
649 // Format: SB ry, offset(rx) MIPS16e
650 // Purpose: Store Byte (Extended)
651 // To store a byte to memory.
654 FEXT_RRI16_mem2_ins<0b11000, "sb", mem16, IIStore>, MayStore;
657 // The Sel(T) instructions are pseudos
658 // T means that they use T8 implicitly.
661 // Format: SelBeqZ rd, rs, rt
662 // Purpose: if rt==0, do nothing
665 def SelBeqZ: Sel<0b00100, "beqz", IIAlu>;
668 // Format: SelTBteqZCmp rd, rs, rl, rr
669 // Purpose: b = Cmp rl, rr.
670 // If b==0 then do nothing.
671 // if b!=0 then rd = rs
673 def SelTBteqZCmp: SelT<0b000, "bteqz", 0b01010, "cmp", IIAlu>;
676 // Format: SelTBteqZCmpi rd, rs, rl, rr
677 // Purpose: b = Cmpi rl, imm.
678 // If b==0 then do nothing.
679 // if b!=0 then rd = rs
681 def SelTBteqZCmpi: SeliT<0b000, "bteqz", 0b01110, "cmpi", IIAlu>;
684 // Format: SelTBteqZSlt rd, rs, rl, rr
685 // Purpose: b = Slt rl, rr.
686 // If b==0 then do nothing.
687 // if b!=0 then rd = rs
689 def SelTBteqZSlt: SelT<0b000, "bteqz", 0b00010, "slt", IIAlu>;
692 // Format: SelTBteqZSlti rd, rs, rl, rr
693 // Purpose: b = Slti rl, imm.
694 // If b==0 then do nothing.
695 // if b!=0 then rd = rs
697 def SelTBteqZSlti: SeliT<0b000, "bteqz", 0b01010, "slti", IIAlu>;
700 // Format: SelTBteqZSltu rd, rs, rl, rr
701 // Purpose: b = Sltu rl, rr.
702 // If b==0 then do nothing.
703 // if b!=0 then rd = rs
705 def SelTBteqZSltu: SelT<0b000, "bteqz", 0b00011, "sltu", IIAlu>;
708 // Format: SelTBteqZSltiu rd, rs, rl, rr
709 // Purpose: b = Sltiu rl, imm.
710 // If b==0 then do nothing.
711 // if b!=0 then rd = rs
713 def SelTBteqZSltiu: SeliT<0b000, "bteqz", 0b01011, "sltiu", IIAlu>;
716 // Format: SelBnez rd, rs, rt
717 // Purpose: if rt!=0, do nothing
720 def SelBneZ: Sel<0b00101, "bnez", IIAlu>;
723 // Format: SelTBtneZCmp rd, rs, rl, rr
724 // Purpose: b = Cmp rl, rr.
725 // If b!=0 then do nothing.
726 // if b0=0 then rd = rs
728 def SelTBtneZCmp: SelT<0b001, "btnez", 0b01010, "cmp", IIAlu>;
731 // Format: SelTBtnezCmpi rd, rs, rl, rr
732 // Purpose: b = Cmpi rl, imm.
733 // If b!=0 then do nothing.
734 // if b==0 then rd = rs
736 def SelTBtneZCmpi: SeliT<0b000, "btnez", 0b01110, "cmpi", IIAlu>;
739 // Format: SelTBtneZSlt rd, rs, rl, rr
740 // Purpose: b = Slt rl, rr.
741 // If b!=0 then do nothing.
742 // if b==0 then rd = rs
744 def SelTBtneZSlt: SelT<0b001, "btnez", 0b00010, "slt", IIAlu>;
747 // Format: SelTBtneZSlti rd, rs, rl, rr
748 // Purpose: b = Slti rl, imm.
749 // If b!=0 then do nothing.
750 // if b==0 then rd = rs
752 def SelTBtneZSlti: SeliT<0b001, "btnez", 0b01010, "slti", IIAlu>;
755 // Format: SelTBtneZSltu rd, rs, rl, rr
756 // Purpose: b = Sltu rl, rr.
757 // If b!=0 then do nothing.
758 // if b==0 then rd = rs
760 def SelTBtneZSltu: SelT<0b001, "btnez", 0b00011, "sltu", IIAlu>;
763 // Format: SelTBtneZSltiu rd, rs, rl, rr
764 // Purpose: b = Slti rl, imm.
765 // If b!=0 then do nothing.
766 // if b==0 then rd = rs
768 def SelTBtneZSltiu: SeliT<0b001, "btnez", 0b01011, "sltiu", IIAlu>;
771 // Format: SH ry, offset(rx) MIPS16e
772 // Purpose: Store Halfword (Extended)
773 // To store a halfword to memory.
776 FEXT_RRI16_mem2_ins<0b11001, "sh", mem16, IIStore>, MayStore;
779 // Format: SLL rx, ry, sa MIPS16e
780 // Purpose: Shift Word Left Logical (Extended)
781 // To execute a left-shift of a word by a fixed number of bits—0 to 31 bits.
783 def SllX16: FEXT_SHIFT16_ins<0b00, "sll", IIAlu>;
786 // Format: SLLV ry, rx MIPS16e
787 // Purpose: Shift Word Left Logical Variable
788 // To execute a left-shift of a word by a variable number of bits.
790 def SllvRxRy16 : FRxRxRy16_ins<0b00100, "sllv", IIAlu>;
793 // Format: SLTI rx, immediate MIPS16e
794 // Purpose: Set on Less Than Immediate (Extended)
795 // To record the result of a less-than comparison with a constant.
797 def SltiCCRxImmX16: FEXT_CCRXI16_ins<0b01010, "slti", IIAlu>;
800 // Format: SLTIU rx, immediate MIPS16e
801 // Purpose: Set on Less Than Immediate Unsigned (Extended)
802 // To record the result of a less-than comparison with a constant.
804 def SltiuCCRxImmX16: FEXT_CCRXI16_ins<0b01011, "sltiu", IIAlu>;
807 // Format: SLT rx, ry MIPS16e
808 // Purpose: Set on Less Than
809 // To record the result of a less-than comparison.
811 def SltRxRy16: FRR16_ins<0b00010, "slt", IIAlu>;
813 def SltCCRxRy16: FCCRR16_ins<0b00010, "slt", IIAlu>;
815 // Format: SLTU rx, ry MIPS16e
816 // Purpose: Set on Less Than Unsigned
817 // To record the result of an unsigned less-than comparison.
821 def SltuCCRxRy16: FCCRR16_ins<0b00011, "sltu", IIAlu>;
823 // Format: SRAV ry, rx MIPS16e
824 // Purpose: Shift Word Right Arithmetic Variable
825 // To execute an arithmetic right-shift of a word by a variable
828 def SravRxRy16: FRxRxRy16_ins<0b00111, "srav", IIAlu>;
832 // Format: SRA rx, ry, sa MIPS16e
833 // Purpose: Shift Word Right Arithmetic (Extended)
834 // To execute an arithmetic right-shift of a word by a fixed
835 // number of bits—1 to 8 bits.
837 def SraX16: FEXT_SHIFT16_ins<0b11, "sra", IIAlu>;
841 // Format: SRLV ry, rx MIPS16e
842 // Purpose: Shift Word Right Logical Variable
843 // To execute a logical right-shift of a word by a variable
846 def SrlvRxRy16: FRxRxRy16_ins<0b00110, "srlv", IIAlu>;
850 // Format: SRL rx, ry, sa MIPS16e
851 // Purpose: Shift Word Right Logical (Extended)
852 // To execute a logical right-shift of a word by a fixed
853 // number of bits—1 to 31 bits.
855 def SrlX16: FEXT_SHIFT16_ins<0b10, "srl", IIAlu>;
858 // Format: SUBU rz, rx, ry MIPS16e
859 // Purpose: Subtract Unsigned Word
860 // To subtract 32-bit integers
862 def SubuRxRyRz16: FRRR16_ins<0b11, "subu", IIAlu>, ArithLogic16Defs<0>;
865 // Format: SW ry, offset(rx) MIPS16e
866 // Purpose: Store Word (Extended)
867 // To store a word to memory.
870 FEXT_RRI16_mem2_ins<0b11011, "sw", mem16, IIStore>, MayStore;
873 // Format: SW rx, offset(sp) MIPS16e
874 // Purpose: Store Word rx (SP-Relative)
875 // To store an SP-relative word to memory.
877 def SwRxSpImmX16: FEXT_RI16_SP_explicit_ins<0b11010, "sw", IIStore>, MayStore;
881 // Format: XOR rx, ry MIPS16e
883 // To do a bitwise logical XOR.
885 def XorRxRxRy16: FRxRxRy16_ins<0b01110, "xor", IIAlu>, ArithLogic16Defs<1>;
887 class Mips16Pat<dag pattern, dag result> : Pat<pattern, result> {
888 let Predicates = [InMips16Mode];
893 class ArithLogicU_pat<PatFrag OpNode, Instruction I> :
894 Mips16Pat<(OpNode CPU16Regs:$r),
897 def: ArithLogicU_pat<not, NotRxRy16>;
898 def: ArithLogicU_pat<ineg, NegRxRy16>;
900 class ArithLogic16_pat<SDNode OpNode, Instruction I> :
901 Mips16Pat<(OpNode CPU16Regs:$l, CPU16Regs:$r),
902 (I CPU16Regs:$l, CPU16Regs:$r)>;
904 def: ArithLogic16_pat<add, AdduRxRyRz16>;
905 def: ArithLogic16_pat<and, AndRxRxRy16>;
906 def: ArithLogic16_pat<mul, MultRxRyRz16>;
907 def: ArithLogic16_pat<or, OrRxRxRy16>;
908 def: ArithLogic16_pat<sub, SubuRxRyRz16>;
909 def: ArithLogic16_pat<xor, XorRxRxRy16>;
911 // Arithmetic and logical instructions with 2 register operands.
913 class ArithLogicI16_pat<SDNode OpNode, PatFrag imm_type, Instruction I> :
914 Mips16Pat<(OpNode CPU16Regs:$in, imm_type:$imm),
915 (I CPU16Regs:$in, imm_type:$imm)>;
917 def: ArithLogicI16_pat<add, immSExt16, AddiuRxRxImmX16>;
918 def: ArithLogicI16_pat<shl, immZExt5, SllX16>;
919 def: ArithLogicI16_pat<srl, immZExt5, SrlX16>;
920 def: ArithLogicI16_pat<sra, immZExt5, SraX16>;
922 class shift_rotate_reg16_pat<SDNode OpNode, Instruction I> :
923 Mips16Pat<(OpNode CPU16Regs:$r, CPU16Regs:$ra),
924 (I CPU16Regs:$r, CPU16Regs:$ra)>;
926 def: shift_rotate_reg16_pat<shl, SllvRxRy16>;
927 def: shift_rotate_reg16_pat<sra, SravRxRy16>;
928 def: shift_rotate_reg16_pat<srl, SrlvRxRy16>;
930 class LoadM16_pat<PatFrag OpNode, Instruction I> :
931 Mips16Pat<(OpNode addr:$addr), (I addr:$addr)>;
933 def: LoadM16_pat<sextloadi8, LbRxRyOffMemX16>;
934 def: LoadM16_pat<zextloadi8, LbuRxRyOffMemX16>;
935 def: LoadM16_pat<sextloadi16, LhRxRyOffMemX16>;
936 def: LoadM16_pat<zextloadi16, LhuRxRyOffMemX16>;
937 def: LoadM16_pat<load, LwRxRyOffMemX16>;
939 class StoreM16_pat<PatFrag OpNode, Instruction I> :
940 Mips16Pat<(OpNode CPU16Regs:$r, addr:$addr), (I CPU16Regs:$r, addr:$addr)>;
942 def: StoreM16_pat<truncstorei8, SbRxRyOffMemX16>;
943 def: StoreM16_pat<truncstorei16, ShRxRyOffMemX16>;
944 def: StoreM16_pat<store, SwRxRyOffMemX16>;
946 // Unconditional branch
947 class UncondBranch16_pat<SDNode OpNode, Instruction I>:
948 Mips16Pat<(OpNode bb:$imm16), (I bb:$imm16)> {
949 let Predicates = [RelocPIC, InMips16Mode];
952 // Jump and Link (Call)
953 let isCall=1, hasDelaySlot=1 in
955 FRR16_JALRC<0, 0, 0, (outs), (ins CPU16Regs:$rs),
956 "jalr \t$rs", [(MipsJmpLink CPU16Regs:$rs)], IIBranch>;
959 let isReturn=1, isTerminator=1, hasDelaySlot=1, isBarrier=1, hasCtrlDep=1,
960 hasExtraSrcRegAllocReq = 1 in
961 def RetRA16 : MipsPseudo16<(outs), (ins), "", [(MipsRet)]>;
966 class SetCC_R16<PatFrag cond_op, Instruction I>:
967 Mips16Pat<(cond_op CPU16Regs:$rx, CPU16Regs:$ry),
968 (I CPU16Regs:$rx, CPU16Regs:$ry)>;
970 class SetCC_I16<PatFrag cond_op, PatLeaf imm_type, Instruction I>:
971 Mips16Pat<(cond_op CPU16Regs:$rx, imm_type:$imm16),
972 (I CPU16Regs:$rx, imm_type:$imm16)>;
974 // Large (>16 bit) immediate loads
975 def : Mips16Pat<(i32 imm:$imm),
976 (OrRxRxRy16 (SllX16 (LiRxImmX16 (HI16 imm:$imm)), 16),
977 (LiRxImmX16 (LO16 imm:$imm)))>;
980 // Some branch conditional patterns are not generated by llvm at this time.
981 // Some are for seemingly arbitrary reasons not used: i.e. with signed number
982 // comparison they are used and for unsigned a different pattern is used.
983 // I am pushing upstream from the full mips16 port and it seemed that I needed
984 // these earlier and the mips32 port has these but now I cannot create test
985 // cases that use these patterns. While I sort this all out I will leave these
986 // extra patterns commented out and if I can be sure they are really not used,
987 // I will delete the code. I don't want to check the code in uncommented without
988 // a valid test case. In some cases, the compiler is generating patterns with
989 // setcc instead and earlier I had implemented setcc first so may have masked
990 // the problem. The setcc variants are suboptimal for mips16 so I may wantto
991 // figure out how to enable the brcond patterns or else possibly new
992 // combinations of of brcond and setcc.
998 <(brcond (i32 (seteq CPU16Regs:$rx, CPU16Regs:$ry)), bb:$imm16),
999 (BteqzT8CmpX16 CPU16Regs:$rx, CPU16Regs:$ry, bb:$imm16)
1004 <(brcond (i32 (seteq CPU16Regs:$rx, immZExt16:$imm)), bb:$targ16),
1005 (BteqzT8CmpiX16 CPU16Regs:$rx, immSExt16:$imm, bb:$targ16)
1009 <(brcond (i32 (seteq CPU16Regs:$rx, 0)), bb:$targ16),
1010 (BeqzRxImmX16 CPU16Regs:$rx, bb:$targ16)
1014 // bcond-setgt (do we need to have this pair of setlt, setgt??)
1017 <(brcond (i32 (setgt CPU16Regs:$rx, CPU16Regs:$ry)), bb:$imm16),
1018 (BtnezT8SltX16 CPU16Regs:$ry, CPU16Regs:$rx, bb:$imm16)
1025 <(brcond (i32 (setge CPU16Regs:$rx, CPU16Regs:$ry)), bb:$imm16),
1026 (BteqzT8SltX16 CPU16Regs:$rx, CPU16Regs:$ry, bb:$imm16)
1030 // never called because compiler transforms a >= k to a > (k-1)
1032 <(brcond (i32 (setge CPU16Regs:$rx, immSExt16:$imm)), bb:$imm16),
1033 (BteqzT8SltiX16 CPU16Regs:$rx, immSExt16:$imm, bb:$imm16)
1040 <(brcond (i32 (setlt CPU16Regs:$rx, CPU16Regs:$ry)), bb:$imm16),
1041 (BtnezT8SltX16 CPU16Regs:$rx, CPU16Regs:$ry, bb:$imm16)
1045 <(brcond (i32 (setlt CPU16Regs:$rx, immSExt16:$imm)), bb:$imm16),
1046 (BtnezT8SltiX16 CPU16Regs:$rx, immSExt16:$imm, bb:$imm16)
1053 <(brcond (i32 (setle CPU16Regs:$rx, CPU16Regs:$ry)), bb:$imm16),
1054 (BteqzT8SltX16 CPU16Regs:$ry, CPU16Regs:$rx, bb:$imm16)
1061 <(brcond (i32 (setne CPU16Regs:$rx, CPU16Regs:$ry)), bb:$imm16),
1062 (BtnezT8CmpX16 CPU16Regs:$rx, CPU16Regs:$ry, bb:$imm16)
1066 <(brcond (i32 (setne CPU16Regs:$rx, immZExt16:$imm)), bb:$targ16),
1067 (BtnezT8CmpiX16 CPU16Regs:$rx, immSExt16:$imm, bb:$targ16)
1071 <(brcond (i32 (setne CPU16Regs:$rx, 0)), bb:$targ16),
1072 (BnezRxImmX16 CPU16Regs:$rx, bb:$targ16)
1076 // This needs to be there but I forget which code will generate it
1079 <(brcond CPU16Regs:$rx, bb:$targ16),
1080 (BnezRxImmX16 CPU16Regs:$rx, bb:$targ16)
1089 // <(brcond (i32 (setugt CPU16Regs:$rx, CPU16Regs:$ry)), bb:$imm16),
1090 // (BtnezT8SltuX16 CPU16Regs:$ry, CPU16Regs:$rx, bb:$imm16)
1097 // <(brcond (i32 (setuge CPU16Regs:$rx, CPU16Regs:$ry)), bb:$imm16),
1098 // (BteqzT8SltuX16 CPU16Regs:$rx, CPU16Regs:$ry, bb:$imm16)
1106 // <(brcond (i32 (setult CPU16Regs:$rx, CPU16Regs:$ry)), bb:$imm16),
1107 // (BtnezT8SltuX16 CPU16Regs:$rx, CPU16Regs:$ry, bb:$imm16)
1110 def: UncondBranch16_pat<br, BimmX16>;
1113 def: Mips16Pat<(i32 immSExt16:$in),
1114 (AddiuRxRxImmX16 (Move32R16 ZERO), immSExt16:$in)>;
1116 def: Mips16Pat<(i32 immZExt16:$in), (LiRxImmX16 immZExt16:$in)>;
1122 <(MipsDivRem CPU16Regs:$rx, CPU16Regs:$ry),
1123 (DivRxRy16 CPU16Regs:$rx, CPU16Regs:$ry)>;
1129 <(MipsDivRemU CPU16Regs:$rx, CPU16Regs:$ry),
1130 (DivuRxRy16 CPU16Regs:$rx, CPU16Regs:$ry)>;
1135 // if !(a < b) x = y
1137 def : Mips16Pat<(select (i32 (setge CPU16Regs:$a, CPU16Regs:$b)),
1138 CPU16Regs:$x, CPU16Regs:$y),
1139 (SelTBteqZSlt CPU16Regs:$x, CPU16Regs:$y,
1140 CPU16Regs:$a, CPU16Regs:$b)>;
1147 def : Mips16Pat<(select (i32 (setgt CPU16Regs:$a, CPU16Regs:$b)),
1148 CPU16Regs:$x, CPU16Regs:$y),
1149 (SelTBtneZSlt CPU16Regs:$x, CPU16Regs:$y,
1150 CPU16Regs:$b, CPU16Regs:$a)>;
1155 // if !(a < b) x = y;
1158 (select (i32 (setuge CPU16Regs:$a, CPU16Regs:$b)),
1159 CPU16Regs:$x, CPU16Regs:$y),
1160 (SelTBteqZSltu CPU16Regs:$x, CPU16Regs:$y,
1161 CPU16Regs:$a, CPU16Regs:$b)>;
1168 def : Mips16Pat<(select (i32 (setugt CPU16Regs:$a, CPU16Regs:$b)),
1169 CPU16Regs:$x, CPU16Regs:$y),
1170 (SelTBtneZSltu CPU16Regs:$x, CPU16Regs:$y,
1171 CPU16Regs:$b, CPU16Regs:$a)>;
1175 // due to an llvm optimization, i don't think that this will ever
1176 // be used. This is transformed into x = (a > k-1)?x:y
1181 // (select (i32 (setge CPU16Regs:$lhs, immSExt16:$rhs)),
1182 // CPU16Regs:$T, CPU16Regs:$F),
1183 // (SelTBteqZSlti CPU16Regs:$T, CPU16Regs:$F,
1184 // CPU16Regs:$lhs, immSExt16:$rhs)>;
1187 // (select (i32 (setuge CPU16Regs:$lhs, immSExt16:$rhs)),
1188 // CPU16Regs:$T, CPU16Regs:$F),
1189 // (SelTBteqZSltiu CPU16Regs:$T, CPU16Regs:$F,
1190 // CPU16Regs:$lhs, immSExt16:$rhs)>;
1195 // if !(a < k) x = y;
1198 (select (i32 (setlt CPU16Regs:$a, immSExt16:$b)),
1199 CPU16Regs:$x, CPU16Regs:$y),
1200 (SelTBtneZSlti CPU16Regs:$x, CPU16Regs:$y,
1201 CPU16Regs:$a, immSExt16:$b)>;
1207 // x = (a <= b)? x : y
1211 def : Mips16Pat<(select (i32 (setle CPU16Regs:$a, CPU16Regs:$b)),
1212 CPU16Regs:$x, CPU16Regs:$y),
1213 (SelTBteqZSlt CPU16Regs:$x, CPU16Regs:$y,
1214 CPU16Regs:$b, CPU16Regs:$a)>;
1218 // x = (a <= b)? x : y
1222 def : Mips16Pat<(select (i32 (setule CPU16Regs:$a, CPU16Regs:$b)),
1223 CPU16Regs:$x, CPU16Regs:$y),
1224 (SelTBteqZSltu CPU16Regs:$x, CPU16Regs:$y,
1225 CPU16Regs:$b, CPU16Regs:$a)>;
1229 // x = (a == b)? x : y
1231 // if (a != b) x = y
1233 def : Mips16Pat<(select (i32 (seteq CPU16Regs:$a, CPU16Regs:$b)),
1234 CPU16Regs:$x, CPU16Regs:$y),
1235 (SelTBteqZCmp CPU16Regs:$x, CPU16Regs:$y,
1236 CPU16Regs:$b, CPU16Regs:$a)>;
1240 // x = (a == 0)? x : y
1242 // if (a != 0) x = y
1244 def : Mips16Pat<(select (i32 (seteq CPU16Regs:$a, 0)),
1245 CPU16Regs:$x, CPU16Regs:$y),
1246 (SelBeqZ CPU16Regs:$x, CPU16Regs:$y,
1252 // x = (a == k)? x : y
1254 // if (a != k) x = y
1256 def : Mips16Pat<(select (i32 (seteq CPU16Regs:$a, immZExt16:$k)),
1257 CPU16Regs:$x, CPU16Regs:$y),
1258 (SelTBteqZCmpi CPU16Regs:$x, CPU16Regs:$y,
1259 CPU16Regs:$a, immZExt16:$k)>;
1264 // x = (a != b)? x : y
1266 // if (a == b) x = y
1269 def : Mips16Pat<(select (i32 (setne CPU16Regs:$a, CPU16Regs:$b)),
1270 CPU16Regs:$x, CPU16Regs:$y),
1271 (SelTBtneZCmp CPU16Regs:$x, CPU16Regs:$y,
1272 CPU16Regs:$b, CPU16Regs:$a)>;
1276 // x = (a != 0)? x : y
1278 // if (a == 0) x = y
1280 def : Mips16Pat<(select (i32 (setne CPU16Regs:$a, 0)),
1281 CPU16Regs:$x, CPU16Regs:$y),
1282 (SelBneZ CPU16Regs:$x, CPU16Regs:$y,
1290 def : Mips16Pat<(select CPU16Regs:$a,
1291 CPU16Regs:$x, CPU16Regs:$y),
1292 (SelBneZ CPU16Regs:$x, CPU16Regs:$y,
1298 // x = (a != k)? x : y
1300 // if (a == k) x = y
1302 def : Mips16Pat<(select (i32 (setne CPU16Regs:$a, immZExt16:$k)),
1303 CPU16Regs:$x, CPU16Regs:$y),
1304 (SelTBtneZCmpi CPU16Regs:$x, CPU16Regs:$y,
1305 CPU16Regs:$a, immZExt16:$k)>;
1308 // When writing C code to test setxx these patterns,
1309 // some will be transformed into
1310 // other things. So we test using C code but using -O3 and -O0
1315 <(seteq CPU16Regs:$lhs,CPU16Regs:$rhs),
1316 (SltiuCCRxImmX16 (XorRxRxRy16 CPU16Regs:$lhs, CPU16Regs:$rhs), 1)>;
1319 <(seteq CPU16Regs:$lhs, 0),
1320 (SltiuCCRxImmX16 CPU16Regs:$lhs, 1)>;
1328 <(setge CPU16Regs:$lhs, CPU16Regs:$rhs),
1329 (XorRxRxRy16 (SltCCRxRy16 CPU16Regs:$lhs, CPU16Regs:$rhs),
1333 // For constants, llvm transforms this to:
1334 // x > (k -1) and then reverses the operands to use setlt. So this pattern
1335 // is not used now by the compiler. (Presumably checking that k-1 does not
1336 // overflow). The compiler never uses this at a the current time, due to
1337 // other optimizations.
1340 // <(setge CPU16Regs:$lhs, immSExt16:$rhs),
1341 // (XorRxRxRy16 (SltiCCRxImmX16 CPU16Regs:$lhs, immSExt16:$rhs),
1342 // (LiRxImmX16 1))>;
1344 // This catches the x >= -32768 case by transforming it to x > -32769
1347 <(setgt CPU16Regs:$lhs, -32769),
1348 (XorRxRxRy16 (SltiCCRxImmX16 CPU16Regs:$lhs, -32768),
1357 <(setgt CPU16Regs:$lhs, CPU16Regs:$rhs),
1358 (SltCCRxRy16 CPU16Regs:$rhs, CPU16Regs:$lhs)>;
1364 <(setle CPU16Regs:$lhs, CPU16Regs:$rhs),
1365 (XorRxRxRy16 (SltCCRxRy16 CPU16Regs:$rhs, CPU16Regs:$lhs), (LiRxImmX16 1))>;
1370 def: SetCC_R16<setlt, SltCCRxRy16>;
1372 def: SetCC_I16<setlt, immSExt16, SltiCCRxImmX16>;
1378 <(setne CPU16Regs:$lhs,CPU16Regs:$rhs),
1379 (SltuCCRxRy16 (LiRxImmX16 0),
1380 (XorRxRxRy16 CPU16Regs:$lhs, CPU16Regs:$rhs))>;
1387 <(setuge CPU16Regs:$lhs, CPU16Regs:$rhs),
1388 (XorRxRxRy16 (SltuCCRxRy16 CPU16Regs:$lhs, CPU16Regs:$rhs),
1391 // this pattern will never be used because the compiler will transform
1392 // x >= k to x > (k - 1) and then use SLT
1395 // <(setuge CPU16Regs:$lhs, immZExt16:$rhs),
1396 // (XorRxRxRy16 (SltiuCCRxImmX16 CPU16Regs:$lhs, immZExt16:$rhs),
1397 // (LiRxImmX16 1))>;
1403 <(setugt CPU16Regs:$lhs, CPU16Regs:$rhs),
1404 (SltuCCRxRy16 CPU16Regs:$rhs, CPU16Regs:$lhs)>;
1410 <(setule CPU16Regs:$lhs, CPU16Regs:$rhs),
1411 (XorRxRxRy16 (SltuCCRxRy16 CPU16Regs:$rhs, CPU16Regs:$lhs), (LiRxImmX16 1))>;
1416 def: SetCC_R16<setult, SltuCCRxRy16>;
1418 def: SetCC_I16<setult, immSExt16, SltiuCCRxImmX16>;
1420 def: Mips16Pat<(add CPU16Regs:$hi, (MipsLo tglobaladdr:$lo)),
1421 (AddiuRxRxImmX16 CPU16Regs:$hi, tglobaladdr:$lo)>;