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

UHADD (vector, 16B)

Test 1: uops

Code:

  uhadd v0.16b, v0.16b, v1.16b
  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
100420371506116872510001000100026468012018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371506116872510001000100026468002018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371506116872510001000100026468002018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371506116872510001000100026468002018203720371572318951000100020002037203711100110001073116111787100020382038203820382038
100420371509616872510001000100026468002018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371506116872510001000100026468002018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371506116872510001000100026468002018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371606116872510001000100026468002018203720371572318951000100020002037203711100110000373116111787100020382038203820382038
100420371508216872510001000100026468002018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371506116872510001000100026468002018203720371572318951000100020002037203711100110000073116111787100020382038203820382038

Test 2: Latency 1->2

Code:

  uhadd v0.16b, v0.16b, v1.16b
  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)03mmu table walk data (08)l2 tlb miss data (0b)1e1f3f4e51schedule 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)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
102042003715000006119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100000107102162219791100001002003820038200382003820038
102042003715000006119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000007102162219791100001002003820038200382003820038
102042003715000006119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100200067102162219791100001002003820038200382003820038
102042003715000006119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100002007102162219791100001002003820038200382003820038
1020420037150006072619687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000007102162219791100001002003820038200382003820038
102042003715500006119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000107102162219791100001002003820038200382003820038
1020420037150001206119687251010010010000100100005222847680020018200372003718422318745101002001000020020000200372003721102011009910010010000100000107102162219791100001002003820038200382003820038
102042003715000006119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000207102162219791100001002003820038200382003820038
1020420037150000029119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000007102162219791100001002003820038200382003820038
102042003715000006119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000007102162219791100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire uop (01)cycle (02)03mmu table walk data (08)09l2 tlb miss instruction (0a)l2 tlb miss data (0b)18191e1f3f4e51schedule 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)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
100242003715000000000888196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000000006402162219785010000102003820038200382008120038
10024200371500000000061196872510010101000010100005028476800200182003720037184443187671001020100002020000200372003711100211091010100001000000006402162219785010000102003820038200382003820038
10024200371500000000061196872510010101000010100005028476800200182003720037184443187671001020100002020000200372003711100211091010100001000000006402162219785010000102003820038200382003820038
100242003715000000000861196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000000906402162219785010000102003820038200382003820038
100242003715000000000986196872510010101000010100005028476800200182003720037184443187671001020100002020000200372003711100211091010100001000000006402162219785010000102003820038200382003820038
100242003715000000000805196872510010101000010100005028476800200182003720037184443187671001020100002020000200372003711100211091010100001000000006402162219785010000102003820038200382003820038
10024200371500000000061196872510010101000010100005028476800200182003720037184443187671001020100002020000200372003711100211091010100001000000006402162219785010000102003820038200382003820038
100242003715000000000996196872510010101000010100005028476800200182003720037184443187671001020100002020000200372003711100211091010100001000000006402162219785010000102003820038200382003820038
100242003715000000000995196872510010101000010100005028476800200182003720037184443187671001020100002020000200372003711100211091010100001000000006402162219785010000102003820038200382003820038
10024200371500000000061196872510010101000010100005028476800200182003720037184443187671001020100002020000200372003711100211091010100001000000006402162219785010000102003820038200382003820038

Test 3: Latency 1->3

Code:

  uhadd v0.16b, v1.16b, v0.16b
  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)033f4e51schedule 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)9fld unit uop (a6)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
1020420037150851196872510100100100001001000050028476800200182003720037184223187451010020010000200200002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
102042003715011571968725101001001000010010000500284768002001820037200371842231874510100200100002002000020037200371110201100991001001000010002497101161119791100001002003820038200382003820038
102042003715061196872510100100100001001000050028476800200182003720037184223187451010020010000200200002003720037111020110099100100100001000007101161119794100001002003820038200382003820038
1020420037150166196872510100100100001001000050028476800200182003720037184223187451010020010000200200002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
1020420037150611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010002407101161119791100001002003820038200382003820038
1020420037150839196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
102042003715061196872510100100100001001000050028476800200182003720037184223187451010020010000200200002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
1020420037150839196872510100100100001001000050028476800200182003720037184223187451010020010000200200002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
102042003715061196872510100100100001001000050028476800200182003720037184223187451010020010000200200002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
1020420037150611968725101001001000010010000500284768002001820037200371842231874510100200100002002000020037200371110201100991001001000010001107101161119791100001002008620038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire uop (01)cycle (02)03191e1f3a3f4e51schedule 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)a9acbranch cond mispred nonspec (c5)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
100242003714900006119687251001010100001010000502847680020018200372003718444318767100102010000202000020037200371110021109101010000104000640316331978510000102003820038200382003820038
1002420037150000061196872510010101000010100005028476800200182003720037184443187671001020100002020000200372003711100211091010100001016000640316331978510000102003820038200382003820038
100242003715000008219687251001010100001010000502847680020018200372003718444318767100102010000202000020037200371110021109101010000100000640316331978510000102003820038200382003820038
10024200371500000111019687251001010100001010000502847680020018200372003718444318767100102010000202000020037200371110021109101010000100000640316331978510000102003820038200382003820038
100242003715000006119687251001010100001010000502847680120018200372003718444318767100102010000202000020037200371110021109101010000100000640316331978510000102003820038200382003820038
10024200371500000166119687251001010100001010000502847680020018200372003718444318767100102010000202000020037200371110021109101010000101000640316331978510000102003820038200382003820038
1002420037150000020919687251001010100001010000502847680020018200372003718444318767100102010000202000020037200371110021109101010000100000640316331978510000102003820038200382003820038
1002420037150000072619687251001010100001010000502847680020018200372003718444318767100102010000202000020037200371110021109101010000100000640316331978510000102003820038200382003820038
100242003715000006119687251001010100001010000502847680120018200372003718444318767100102010000202000020037200371110021109101010000100000640316331978510000102003820038200382003820038
1002420037150000078619687251001010100001010000502847680020018200372003718444318767100102010000202000020037200371110021109101010000100000640316331978510000102003820038200382003820038

Test 4: throughput

Count: 8

Code:

  uhadd v0.16b, v8.16b, v9.16b
  uhadd v1.16b, v8.16b, v9.16b
  uhadd v2.16b, v8.16b, v9.16b
  uhadd v3.16b, v8.16b, v9.16b
  uhadd v4.16b, v8.16b, v9.16b
  uhadd v5.16b, v8.16b, v9.16b
  uhadd v6.16b, v8.16b, v9.16b
  uhadd v7.16b, v8.16b, v9.16b
  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)030918191e1f3f51schedule 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)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)l1d cache writeback (a8)acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
802042004815000000100925801001008000010080000500640000200192003820038997339996801002008000020016000020038200381180201100991001008000010000000511021611200350800001002003920039200392003920039
80204200381501000040258010010080000100800005006400002001920038200389973199996801002008000020016000020038200381180201100991001008000010042030511011611200350800001002003920039200392003920039
8020420038150000004025801001008000010080000500640000200192003820038997339996801002008000020016000020038200381180201100991001008000010000000511011611200350800001002003920039200392003920039
80204200891500000082525801001008000010080000500640000200192003820038997339996801002008000020016000020038200381180201100991001008000010000000511011611200350800001002003920039201422003920039
802042003815000000773258010010080000100800005006400002001920038200389973399968010020080000200160000200382003811802011009910010080000100002005110116112003519800001002003920039200392003920039
80204200381500000073325801001008000010080000520640000200192003820038997339996801002008000020016000020038200381180201100991001008000010000000511011611200350800001002003920039200392003920039
802042003815000018068825801001008000010080000500640000200192003820038997339996801002008039320016000020038200381180201100991001008000010020000511011611200350800001002003920039200392003920039
80204200381500000014925801001008000010080000500640000200192003820038997339996801002008000020016000020038200381180201100991001008000010000000511011611200350800001002003920039200392003920039
802042003815000000122625801001008000010080000500640000200192003820038997379996801002008000020016000020038200381180201100991001008000010000000511011611200350800001002003920039201902003920039
8020420038150000004025801001008000010080000500640000200192003820038997339996801002008000020016000020038200381180201100991001008000010000000511011611200350800001002003920039200392023720039

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03191e3f51schedule 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)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)acbranch cond mispred nonspec (c5)cfd5map dispatch bubble (d6)d9ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
8002420048151001062258001010800001080000506400002001920038200389996310018800102080000201600002003820038118002110910108000010000502061606820035080000102003920039200392003920039
8002420038150001253258001010800001080000506400002001920038200389996310018800102080000201600002003820038118002110910108000010000502081608620035080000102003920039200392003920039
8002420038150001279258001010800001080000506400002001920038200389996310018800102080000201600002003820038118002110910108000010000502071606820035180000102003920039200392003920098
8002420038150001212258001010800001080000506400002001920038200389996310018800102080000201600002003820038118002110910108000010000502061606820035080000102003920039200392003920039
80024200381500011562580010108000010800005064000020019200382003899963100188001020800002016000020038200381180021109101080000100005020916061020035080000102003920039200392003920039
800242003815009171258001010800001080194506400002001920088200389996310018800102080000201600002003820038118002110910108000010000502091608620035080000102003920039200392003920039
8002420038150001462258001010800001080000506400002001920038200389996310018800102080000201600002003820038118002110910108000010000502081608620035080000102003920039200392003920039
80024200381500010982580010108000010800005064000020019200382003899963100188001020800002016000020038200381180021109101080000100005020816061020035080000102003920039200392003920039
80024200381500019025800101080000108000050640000200192003820038999631001880010208000020160000200382003811800211091010800001000050206160101020035080000102003920039200392003920039
8002420038150001155258001010800001080000506400002001920038200389996310018800102080000201600002003820038118002110910108000010000502091608920035080000102003920039200392003920039