Apple Microarchitecture Research by Dougall Johnson

M1/A14 P-core (Firestorm): Overview | Base Instructions | SIMD and FP Instructions
M1/A14 E-core (Icestorm):  Overview | Base Instructions | SIMD and FP Instructions

SADDLP (vector, 4H)

Test 1: uops

Code:

  saddlp v0.4h, v0.8b
  movi v0.16b, 1
  movi v1.16b, 2

(no loop instructions)

1000 unrolls and 1 iteration

Retires: 1.000

Issues: 1.000

Integer unit issues: 0.000

Load/store unit issues: 0.000

SIMD/FP unit issues: 1.000

retire uop (01)cycle (02)031e3f4e51schedule uop (52)schedule simd uop (54)dispatch simd uop (57)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map simd uop (7e)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst simd alu (9a)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
100420371606116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110001073116111786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020852038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110001073116111786100020382038203820382038
100420371606116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110001073116111786100020382038203820382038
100420371606116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038

Test 2: Latency 1->2

Code:

  saddlp v0.4h, v0.8b
  movi v0.16b, 1
  movi v1.16b, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 2.0037

retire uop (01)cycle (02)03191e3f4e51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1020420037150021061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000071012511197910100001002003820038200382003820038
1020420037150016561196862510100100100001001015250028513131200182003720037184213187451010020010000200100002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
102042003715000251196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
10204200371500061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
10204200371500061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
10204200371500061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
10204200371500061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000071011611197910100001002003820038200852003820038
102042003715010536196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
10204200371500061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
10204200371500061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000071011611197910100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire uop (01)cycle (02)03191e1f3f4e51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)simd prf full (72)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
100242003715003750611968625100101010000101000050284752102001820037200371844303187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
100242003715001770611968625100101010000101000050284752102001820037200371844303187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
1002420037150000611968625100101010000101000050285004902001820037200371844303187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
100242003715002400611968625100101010000101000050284752112001820037200371844303187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
10024200371500360611968625100101010000101000050284752102001820037200371844303187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
1002420037150000611968625100101010000101000050284752112001820037200371844303187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
1002420037150000611968625100101010000101000050284752112001820037200371844303187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
1002420037150000611968625100231010000101000050284752102001820037200371844303187671016020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
10024200371500180611968625100101010000101000050284752112001820037200371844303187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
10024200371500007261968625100101010000101000050284752102001820037200371844303187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  saddlp v0.4h, v8.8b
  saddlp v1.4h, v8.8b
  saddlp v2.4h, v8.8b
  saddlp v3.4h, v8.8b
  saddlp v4.4h, v8.8b
  saddlp v5.4h, v8.8b
  saddlp v6.4h, v8.8b
  saddlp v7.4h, v8.8b
  movi v8.16b, 9

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code divided by count): 0.2506

retire uop (01)cycle (02)0318191e1f3f51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d tlb miss (a1)l1d cache writeback (a8)branch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
802042003815000240292580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020035800001002003920039200392003920039
80204200381500000292580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020035800001002003920039200392003920039
80204200381500000292580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020115800001002003920039200392003920039
80204200381501190292580108100800081008002050064095212001920038200389977699898012020080032200800322003820038118020110099100100800001002011151180160020035800001002003920039200392003920039
80204200381500000292580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020035800001002003920039200392003920039
80204200381500000292580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020035800001002003920039200392003920039
80204200381500000292580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020035800001002003920039200392003920039
802042003815000210292580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020035800001002003920039200392003920039
8020420038150003540292580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020035800001002003920039200392003920039
80204200381500000292580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020035800001002003920039200392003920039

1000 unrolls and 10 iterations

Result (median cycles for code divided by count): 0.2505

retire uop (01)cycle (02)031e3f51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)5f6061696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d cache writeback (a8)accfd0d2d5map dispatch bubble (d6)dbddfetch restart (de)e0eb? simd retires (ee)? int retires (ef)f5f6f7f8fd
80024200501501239258001010800001080000506400000152001920038200389996310018800102080000208000020038200381180021109101080000100050205011601120035080000102003920039200392003920039
8002420038150039258001010800001080000506400001152001920038200389996310018800102080000208000020038200381180021109101080000100050205011601120035080000102003920039200392003920039
8002420038150039258001010800001080000506400000152001920038200389996310018800102080000208000020038200381180021109101080000100050205011601120035080000102003920039200392003920039
8002420038150960258001010800001080000506400000052001920038200389996310018800102080000208000020038200381180021109101080000100050205111601120035080000102003920039200392003920039
8002420038150039258001010800001080000506400000102001920038200389996310018800102080000208000020038200381180021109101080000100350205111601120035080000102003920039200392003920039
80024200381501860258001010800001080000506400000052001920038200389996310018800102080000208000020038200381180021109101080000100050205111601120035080000102003920039200392003920039
800242003815027514258001010800001080000506400000002001920038200389996310018800102080000208000020038200381180021109101080000100050200011601120035080000102003920039200392003920039
8002420038150039258001010800001080000506400000152001920038200389996310018800102080000208000020038200381180021109101080000100350200111601120035080000102009920039200392003920039
8002420038150039258001010800001080000506400000052001920038200389996310018800102080000208000020038200381180021109101080000100050205111602120035080000102003920039200392003920039
8002420038150039258001010800001080000506400000152001920038200389996310018800102080000208000020038200381180021109101080000100050205111601120035080000102003920039200392003920039