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

CMHS (register, 8H)

Test 1: uops

Code:

  cmhs v0.8h, v0.8h, v1.8h
  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
100420371606616872510001000100026468012018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371506116872510001000100026468002018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371506116872510001000100026468012018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371606116872510001000100026468012018203720371572318951000100020002037203711100110000373116111787100020382038203820382038
100420371506116872510001000100026468002018203720371572318951000100020002037203711100110000373116111787100020382038203820382038
100420371506116872510001000100026468002018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371506116872510001000100026468002018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
1004203716156116872510001000100026468002018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371506116872510001000100026468002018203720371572318951000100020002037203711100110000073116111787100020382038203820382038

Test 2: Latency 1->2

Code:

  cmhs v0.8h, v0.8h, v1.8h
  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)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)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)a9acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
10204200371500000000611968725101001001000010010000500284768020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000071021611197910100001002003820038200382003820038
10204200371500000000971968725101001001000010010000500284768020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371500000000611968725101001001000010010000500284768020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371500000000611968725101001001000010010000500284768020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371500000000611968725101001001000010010000500284768020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371500000000611968725101001001000010010000500284768020018200372003718422318745101002001000020020000200372003711102011009910010010000100000006071011611197910100001002003820038200382003820038
10204200371500000000611968725101001001000010010000500284768020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371500000000611968725101001001000010010000500284768020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371500000000611968725101001001000010010000500284768020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371500000000611968725101001001000010010000500284768020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire uop (01)cycle (02)031e3f4e51schedule 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)60696b6d6emap 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
100242003715006119687251001010100001010000502847680120018020037200371844431876710010201000020200002003720037111002110910101000010000640216221978510000102003820038200382003820038
100242003715006119687251001010100001010000502847680120018020037200371844431876710010201000020200002003720037111002110910101000010006640216221978510000102003820038200382003820038
10024200371500611968725100101010000101000050284768012001802003720037184443187671001020100002020000200372003711100211091010100001003018640216221978510000102003820038200382003820038
1002420037150061196872510010101000010100005028476801200180200372003718444318767100102010000202000020037200371110021109101010000100018640216221978510000102003820038200382003820038
1002420037150061196872510010101000010100005028476801200180200372003718444318767100102010000202000020037200371110021109101010000100379640216221978510000102003820038200382003820038
100242003715006119687251001010100001010000502847680120018020037200371844431876710010201000020200002003720037111002110910101000010030640216221978510000102003820038200382003820038
100242003715006119687251001010100001010000502847680120018020037200371844431876710010201000020200002003720037111002110910101000010010640216221978510000102003820038200382003820038
100242003715006119687251001010100001010000502847680120018020037200371844431876710010201000020200002003720037111002110910101000010010640216221978510000102003820038200382003820038
1002420037150072619687251001010100001010000502847680120018020037200371844431876710010201000020200002003720037111002110910101000010000640216221978510000102003820038200382003820038
100242003715006119687251001010100001010000502847680120018020037200371844431876710010201000020200002003720037111002110910101000010310640216221978510000102003820038200382003820038

Test 3: Latency 1->3

Code:

  cmhs v0.8h, v1.8h, v0.8h
  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)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)ld unit uop (a6)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
102042003715000611968725101001001000010010000500284768020018200372003718422318745101002001000020020000200372003711102011009910010010000100223127101161119791100001002003820038200382003820038
10204200371500061196872510100100100001001000050028476802001820037200371842231874510100200100002002000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
10204200371500061196872510100100100001001000050028476802001820037200371842231874510100200100002002000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
10204200371500061196872510100100100001001000050028476802001820037200371842231874510100200100002002000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
10204200371500061196872510100100100001001000050028476802001820037200371842231874510100200100002002000020037200371110201100991001001000010000107101161119791100001002003820038200382003820038
10204200371500061196542510100100100001001000050028476802001820037200371842231874510100200100002002000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
10204200371500061196872510100100100001001000050028476802001820037200371842231874510100200100002002000020037200371110201100991001001000010000107101161119791100001002003820038200382003820038
102042003715000611968725101001001000010010000500284768020018200372003718422318745101002001000020020000200372003711102011009910010010000100003907101161119791100001002003820038200382003820038
10204200371500061196872510100100100001001000050028476802001820037200371842231874510100200100002002000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
10204200371500061196872510100100100001001000050028476802001820037200371842231874510100200100002002000020037200371110201100991001001000010000607101161119791100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire uop (01)cycle (02)03mmu table walk instruction (07)mmu table walk data (08)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)6061696b6d6emap 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)a9acc2cfd0d2d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
10024200371500000000611968725100101010000101000050284768000200180200372003718444318767100102010000202000020037200371110021109101010000100000000640002162219785010000102003820038200382003820038
10024200371500000000611968725100101010000101000050284768000200180200372003718444318767100102010000202000020037200371110021109101010000100000000640002162219785010000102003820038200382003820038
10024200371490000000611968725100101010000101000050284768000200180200372003718444318767100102010000202000020037200371110021109101010000100000000640002162219785010000102003820038200382003820038
10024200371500000000611968725100101010000101000050284768015200180200372003718444318767100102010000202000020037200371110021109101010000100000000640552162219785010000102003820038200382003820038
10024200371500000000611968725100101010000101000050284768015200180200372003718444318767100102010000202000020037200371110021109101010000100000000640552162219785010000102003820038200382003820038
10024200371490000000611968725100101010000101000050284768015200180200372003718444318767100102010000202000020037200371110021109101010000100001000640552162219785010000102003820038200382003820038
10024200371500000000611968725100101010000101000050284768015200180200372003718444318767100102010000202000020037200371110021109101010000100000000640552162219785010000102003820038200382003820038
10024200371500000000611968725100101010000101000050284768015200180200372003718444318767100102010000202000020037200371110021109101010000100000000640552162219785010000102003820038200382003820038
10024200371500000000611968725100101010000101000050284768015200180200372003718444318767100102010000202000020037200371110021109101010000100000000640552162219785010000102003820038200382003820038
10024200371500000000611968725100101010000101000050284768000200180200372003718444318767100102010000202000020037200371110021109101010000100000000640002162219785010000102003820038200382003820038

Test 4: throughput

Count: 8

Code:

  cmhs v0.8h, v8.8h, v9.8h
  cmhs v1.8h, v8.8h, v9.8h
  cmhs v2.8h, v8.8h, v9.8h
  cmhs v3.8h, v8.8h, v9.8h
  cmhs v4.8h, v8.8h, v9.8h
  cmhs v5.8h, v8.8h, v9.8h
  cmhs v6.8h, v8.8h, v9.8h
  cmhs v7.8h, v8.8h, v9.8h
  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 instruction (0a)l2 tlb miss data (0b)191e1f3f51schedule 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 access (a0)l1d tlb miss (a1)l1d cache writeback (a8)a9accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
802042006015000000040258010010080000100800005006400000200192003820038997303999680100200800002001600002003820038118020110099100100800001000000051102161120035800001002003920039200392003920039
802042003815000000040258010010080000100800005006400000200192003820038997373999680100200800002001600002003820038118020110099100100800001000000051101161120035800001002003920039200392003920039
8020420038150000000666258010010080000100800005006400000200192003820038997303999680100200800002001600002003820038118020110099100100800001000000051451161120035800001002003920039200392003920039
80204200381500000001210258010010080000100800005006400000200192003820038997303999680100200800002001600002003820038118020110099100100800001000000051101161120035800001002003920039200392003920039
80204200381500000001177258010010080000100800005006400000200192003820038997303999680100200800002001600002003820038118020110099100100800001000000051101161120035800001002003920039200392003920039
8020420038150000000126258010010080000100801125006400000200192003820038997303999680100200800002001600002003820038118020110099100100800001000000051101161120035800001002003920039200392003920039
802042003815000000040258010010080000100800005006400000200192003820038997303999680100200800002001600002008820038118020110099100100800001000000051101161120035800001002003920039200392003920039
802042003815000000040258010010080000100801955006400000200192003820038997303999680100200800002001600002003820038118020110099100100800001000000051101161120035800001002003920039200392003920039
802042003815000000040258010010080000100800005006400000200192003820038997303999680100200800002001600002003820038118020110099100100800001000000051101161120035800001002003920039200392003920039
802042003815000000040258010010080000100800005006400000200192003820038997303999680100200800002001600002003820038118020110099100100800001000000051101161120035800001002003920039200392003920039

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)6061696d6emap 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)accfd0d2l1i cache miss demand (d3)d5map dispatch bubble (d6)ddfetch restart (de)e0ea? simd retires (ee)? int retires (ef)f5f6f7f8fd
8002420048150039258001010800001080000506400001020019200382003899963100188001020800002016000020038200381180021109101080000100050200003161120035080000102003920039200392003920039
80024200381504539258001010800001080000506400001520019200382003899963100188001020800002016000020038200381180021109101080000100050200001161120035080000102003920039200392003920039
8002420038150039258001010800001080000506400000020019200382003899963100188001020800002016000020075200381180021109101080000100350200001161120035080000102003920039200392003920039
8002420038150039258001010800001080000506400000020019200382003899963100188001020800002016000020038200381180021109101080000100050200001161120035080000102003920039200392003920039
8002420038150039258001010800001080000506400000020019200382003899963100188001020800002016000020038200381180021109101080000100050200001161120035080000102003920039200392003920039
80024200381500134258001010800001080000506400000020019200382003899963100188001020800002016000020038200381180021109101080000100050200001161120035080000102003920039200392003920039
800242003815043239258001010800001080000506400000020019200382003899963100188001020800002016000020038200381180021109101080000100050200001161120035080000102003920039200392003920039
80024200381502739258001010800001080000506400000020019200382003899963100188001020800002016000020038200381180021109101080000100050200001161120035080000102003920039200392003920039
800242003815001957258001010800001080000506400000020019200382003899963100188001020800002016000020038200381180021109101080000100050200002161120035080000102003920039200392003920039
8002420038150039258001010800001080000506400000020019200382003899963100188001020800002016000020038200381180021109101080000100050200001161120035080000102003920039200392003920039