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

SMAX (vector, 4H)

Test 1: uops

Code:

  smax v0.4h, v0.4h, v1.4h
  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)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
1004203715061168725100010001000264680020182037203715723189510001000200020372037111001100073116111787100020382038203820382038
10042037153661168725100010001000264680020182037203715723189510001000200020372037111001100073116111787100020382038203820382038
10042037150164168725100010001000264680020182037203715723189510001000200020372037111001100073116111787100020382038203820382038
1004203715061168725100010001000264680020182037203715723189510001000200020372037111001100073116111787100020382038203820382038
10042037153961168725100010001000264680020182037203715723189510001000200020372037111001100073116111787100020382038203820382038
1004203715061168725100010001000264680020182037203715723189510001000200020372037111001100073116111787100020382038203820382038
10042037153061168725100010001000264680020182037203715723189510001000200020372037111001100073116111787100020382038203820382038
1004203715061168725100010001000264680120182037203715723189510001000200020372037111001100073116111787100020382038203820382038
1004203715061168725100010001000264680120192037203715723192110001000200020372037111001100073116111787100020382038203820382038
1004203716061168725100010001000264680120182037203715723189510001000200020372037111001100073116111787100020382038203820382038

Test 2: Latency 1->2

Code:

  smax v0.4h, v0.4h, v1.4h
  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)03l2 tlb miss data (0b)18191e3f4e51schedule 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 tlb miss (a1)ld unit uop (a6)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1020420084150000061196872510100100100001001000050028476800200182003720037184220318745101002001000020020000200372003711102011009910010010000100000071012511197910100001002003820038200382003820038
1020420037165000061196872510100100100001001000050028476800200182003720037184220318745101002001000020020000200372003711102011009910010010000100000071011611197910100001002003820038200382003820038
1020420037150000061196872510100100100001001000050028476801200182003720037184220318745101002001000020020000200372003711102011009910010010000100001671011611197910100001002003820038200382003820038
1020420037150000061196872510100100100001001000050028476801200182003720037184220318745101002001000020020000200372003711102011009910010010000100000071011611197910100001002003820038200382003820038
102042003715000006119687251010010010000100100005002847680120018200372003718422031874510100200100002002000020083200371110201100991001001000010000012971011611197910100001002003820038200382003820038
1020420037150000061196872510100100100001001000050028476800200182003720037184220318745101002001000020020000200372003711102011009910010010000100000071011611197910100001002003820038200382003820038
1020420037150000061196872510100100100001001000050028476801200182003720037184220318745101002001000020020000200372003711102011009910010010000100000371011611197910100001002003820038200382003820038
10204200371500000611968725101001001000010010000500284768012001820037200371842203187451010020010000200200002003720037111020110099100100100001000018971011611197910100001002003820038200382003820038
1020420037150000061196872510100100100001001000050028476800200182003720037184220318745101002001000020020000200372003711102011009910010010000100000371011611197910100001002003820038200382003820038
1020420037150000061196872510100100100001001000050028476801200182003720037184220318745101002001000020020000200372003711102011009910010010000100000371011611197910100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire uop (01)cycle (02)03mmu table walk data (08)l2 tlb miss data (0b)18191e1f3a3f4e51schedule 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)696d6emap 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 tlb access (a0)ld unit uop (a6)st unit uop (a7)l1d cache writeback (a8)a9acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1002420037150000000061196872510010101000010100005028476802001820037200371844403187671001020100002020000200372003711100211091010100001000080306402162219785010000102003820038200382003820038
1002420037150000000061196872510010101000010100005028476802001820037200371844403187671001020100002020000200372003711100211091010100001000010006402162219785010000102003820038200382003820038
1002420037150000000061196872510010101000010100005028476802001820037200371844403187671001020100002020000200372003711100211091010100001000010006402162219785010000102003820038200382003820038
1002420037149000000061196872510010101000010100005028476802001820037200371844403187671001020100002020000200372003711100211091010100001000012006402162219785010000102003820038200382003820038
1002420037150000000061196872510010101000010100005028476802001820037200371844403187671001020100002020000200372003711100211091010100001000010006402162219785010000102003820038200382003820038
10024200371500000000251196872510010101000010100005028476802001820037200371844403187671001020100002020000200372008411100211091010100001000040306402162219785010000102003820038200382003820038
1002420037150000000061196872510010101000010100005028476802001820037200371844403187671001020100002020000200372003711100211091010100001000020006402162219785010000102003820038200382003820038
1002420037150000000061196872510010101000010100005028476802001820037200371844403187671001020100002020000200372003711100211091010100001000000906402162219785010000102008620038200862008420038
1002420037150000000061196872510010101000010100005028476802001820037200371844403187671001020100002020000200372003711100211091010100001000000796506402162219785010000102003820038200382003820038
100242003715000000001471968725100101010000101000050284768020018200372003718448071876710010201000020200002003720037111002110910101000010000440306402162219785010000102003820038200852003820038

Test 3: Latency 1->3

Code:

  smax v0.4h, v1.4h, v0.4h
  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 tlb access (a0)l1d cache writeback (a8)a9acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
10204200371500010319687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
10204200371500012619687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
1020420037150006119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
10204200371500010319687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100010007101161119791100001002003820038200382003820038
1020420037150006119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100400007101161119791100001002003820038200382003820038
1020420037150006119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
10204200371500014919687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
1020420037150006119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100020007101161119791100001002003820038200382003820038
1020420037150006119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
10204200371500014719687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100002007101161119791100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire uop (01)cycle (02)0318191e3f4e51schedule 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? simd retires (ee)? int retires (ef)f5f6f7f8fd
1002420037150000135196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
100242003715011061196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
100242003715000061196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
100242003715000061196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
100242003715000061196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
100242003715000061196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
100242003715000061196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
100242003715000061196872510010101000010100005028476800200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
100242003715000061196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
100242003715000061196872510010101000010100005028476800200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038

Test 4: throughput

Count: 8

Code:

  smax v0.4h, v8.4h, v9.4h
  smax v1.4h, v8.4h, v9.4h
  smax v2.4h, v8.4h, v9.4h
  smax v3.4h, v8.4h, v9.4h
  smax v4.4h, v8.4h, v9.4h
  smax v5.4h, v8.4h, v9.4h
  smax v6.4h, v8.4h, v9.4h
  smax v7.4h, v8.4h, v9.4h
  movi v8.16b, 9
  movi v9.16b, 10

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

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

retire uop (01)cycle (02)03mmu table walk data (08)l2 tlb miss data (0b)1e1f3a3b3f51schedule 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 access (a0)st unit uop (a7)l1d cache writeback (a8)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
8020420058150000000822580100100800001008000050064000012001920038200389973399968010020080000200160000200382003811802011009910010080000100000511021611200350800001002003920039200392003920039
8020420038150000000402580100100800001008000050064000012001920038200389973399968010020080000200160000200382003811802011009910010080000100000511011611200350800001002003920039200392003920039
8020420038150000000402580100100800001008000050064000012001920038200389973399968010020080000200160000200382003811802011009910010080000100000511011611200350800001002003920039200392003920039
8020420038150000000402580100100800001008000050064000012001920038200389973399968010020080000200160000200382003811802011009910010080000100000511011611200350800001002003920039200392003920039
80204200381500000001662580100100800001008000050064000012001920038200389973399968010020080000200160000200382003811802011009910010080000100000511011611200350800001002003920039200392003920039
8020420038150000000402580100100800001008000050064000012001920038200389973399968010020080000200160000200382003811802011009910010080000100000511011611200350800001002003920039200392003920039
8020420038150000000402580100100800001008000050064000012001920038200389973399968010020080000200160000200382003811802011009910010080000100001511011611200350800001002003920039200392003920039
8020420038150000000402580100100800001008000050064000012001920038200389973399968010020080000200160000200382003811802011009910010080000100000511011611200350800001002003920039200392003920039
80204200381500000001052580100100800001008000050064000012001920038200389973399968010020080000200160000200382003811802011009910010080000100000511011611200350800001002003920039200392003920039
8020420038150000000402580100100800001008000050064000012001920038200389973399968010020080000200160000200382003811802011009910010080000100000511011611200350800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03mmu table walk data (08)09l2 tlb miss data (0b)181e1f3f51schedule 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 access (a0)l1d tlb miss (a1)ld unit uop (a6)l1d cache writeback (a8)a9acc2branch mispred nonspec (cb)cfd0d2l1i cache miss demand (d3)d5map dispatch bubble (d6)d9dadbddfetch restart (de)e0? int output thing (e9)eaeb? simd retires (ee)? int retires (ef)f5f6f7f8fd
8002420039150000000392580010108000010800005064000012001920038200389996310018800102080000201600002003820038118002110910108000010000000005020000211600011112003500080000102003920039200392003920039
800242003815000000039258001010800001080000506400001200192003820038999631001880010208000020160000200382003811800211091010800001000000000502000011160001362003500080000102003920039200392003920039
80024200381500000003925800101080000108000050640000020019200382003899963100188001020800002016078020038200381180021109101080000100000000050200008160001252003500080000102003920039200392003920039
8002420038150000000392580010108000010800005064000002001920038200389996310018800102080000201600002003820038118002110910108000010000000005020000101600010102003500080000102003920039200392003920039
800242003815000000039258001010800001080000506400000200192003820038999631001880010208000020160000200382003811800211091010800001000000000502000013160001142003500080000102003920039200392003920039
8002420038150000000438258001010800001080000506400001200192003820038999631001880010208000020160000200382003811800211091010800001000000000502000061600010102003500080000102003920039200392003920039
80024200381500000903925800101080000108000050640000120019200382003899963100188001020800002016000020038200381180021109101080000100000000050200007160005102003500080000102003920039200392003920039
800242003815000000039258001010800001080000506400000200192003820038999631001880010208000020160000200382003811800211091010800001000000000502000012160001272003500080000102003920039200392003920039
8002420038150000000165258001010800001080000506400001200192003820038999631001880010208000020160000200382003811800211091010800001000000000502000061600010102003500080000102003920039200392003920039
800242003815000000060258001010800001080000506400000200192003820038999631001880010208000020160000200382003811800211091010800001000000000502000011160007122003500080000102003920039200392003920039