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

XTN (2D)

Test 1: uops

Code:

  xtn v0.2s, v0.2d
  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)03mmu table walk data (08)l2 tlb miss data (0b)18191e1f3f4e51schedule 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 tlb access (a0)ld unit uop (a6)st unit uop (a7)l1d cache writeback (a8)a9acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
1004203716000090611686251000100011522645211201820372037157131895100010001000203720371110011000000000073116111786100020382038203820382038
1004203715000000611686251000100010002645211201820372037157131895100010001000203720371110011000000106073116111786100020382038203820382038
1004203716000000611686251000100010002645211201820372037157131895100010001000203720371110011000000000073116111786100020382038203820382038
1004203715000000821686251000100010002645211201820372037157131895100010001000203720371110011000000000073116111786100020382038203820382085
1004203717000000611686251000100010002645211201820372037157131895100010001000203720371110011000000006073116111786100020382038203820382038
1004203715000000611686251000100010002645211201820372037157131895100010001000203720371110011000000000073116111786100020382038203820382038
1004203715000000611686251000100010002645211201820372037157131895100010001000203720371110011000000000073116111786100020382038203820382038
1004203715000000611686251000100010002645211201820372037157131895100010001000203720371110011000000006073116111786100020382038203820382038
1004203716000000611686251000100010002645211201820372037157131895100010001000203720371110011000000003073116111786100020382038203820382038
10042037160000001031686251000100010002645211201820372037157131895100010001000203720371110011000000000073116111786100020382038203820382038

Test 2: Latency 1->2

Code:

  xtn v0.2s, v0.2d
  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)09l2 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)l1d cache writeback (a8)a9acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
10204200371550000000611968625101001001000010010000500284752112001820037200371842131874510100200100002001066420037200371110201100991001001000010000000071011611197910100001002003820038200382003820038
102042003715500000480611968625101001001000010010000500284752112001820037200371843831874510100200100002001000020037200371110201100991001001000010000000071011611197910100001002003820038200382018220038
10204200371550110000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000000071011611197910100001002003820038200382003820038
1020420037156000000020871968625101001001000010010000500285131312001820037200371842131874510100200100002001000020037200371110201100991001001000010000000071011611197910100001002003820181200382003820038
10204200371550000000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000100071011612197910100001002003820038200382003820038
10204200371550000000611968625101001001000010010000500284752112001820037200371842131874510100216100002001000020037200371110201100991001001000010000100071011611197910100001002003820038200382003820038
102042003715600030001031968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000000071011611197910100001002003820038200382003820038
10204200371560000000611968625101001001000012210000500284752112001820037200371842131874510100200100002001000020037200373110201100991001001000010000000071013311197910100001002003820038200382003820038
10204200371550000000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000000071011611197910100001002003820038200382003820038
1020420037155000000061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000300100180800357121997223100001002026620265200382022920275

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)acbranch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
10024200371500001451968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000640216221978610000102003820038200382003820038
10024200371501301451968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010300640216221978610000102003820038200382003820038
1002420037150000611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000640216221978610000102003820038200382003820038
10024200371500001661968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000640216221978610000102003820038200382003820038
1002420037150000611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000640216221978610000102003820038200382003820038
10024200371500001661968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000640216221978610000102003820038200382003820038
1002420037150000611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010000640216221978610000102003820038200382003820038
1002420037150000611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010000640216221978610000102003820038200382003820038
1002420037150000611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000640217221978610000102003820038200382003820038
10024200371560018611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000640216221978610000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  xtn v0.2s, v8.2d
  xtn v1.2s, v8.2d
  xtn v2.2s, v8.2d
  xtn v3.2s, v8.2d
  xtn v4.2s, v8.2d
  xtn v5.2s, v8.2d
  xtn v6.2s, v8.2d
  xtn v7.2s, v8.2d
  movi v8.16b, 9

(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)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)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)branch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
802042005915000002925801081008000810080020500640132200192003820038997769989801202008003220080032200382003811802011009910010080000100011151181161120035800001002003920039200392003920039
802042003814900002925801081008000810080020500640132200192003820038997769989801202008003220080032200382003811802011009910010080000100011151182162220035800001002003920039200392003920039
802042003815000002925801081008000810080020500640132200192003820038997769989801202008003220080032200382003811802011009910010080000100011151182162220035800001002003920039200392003920039
802042003815000002925801081008007210080020500640132200192003820038997769989801202008003220080032200382003811802011009910010080000100011151182161220035800001002003920039200392003920039
802042003815000002925801081008000810080020500640132200192003820038997769989801202028003220080032200382003811802011009910010080000100011151182168420097800001002003920039200392003920039
802042003815000002925801081008000810080020500640132200192003820038997769989801202008003220080032200382003811802011009910010080000100011151182162120035800001002003920039200392003920039
802042003815000002925801081008000810080020500640132200192003820038997769989801202008003220080032200382003811802011009910010080000100011151182161220035800001002003920039200392003920039
802042003815000002925801081008000810080020500640132200192003820038997769989801202008003220080032200382003811802011009910010080000100011151181161220035800001002003920039200392003920039
802042003815000002925801081008000810080020500640132200192003820038997769989801202008003220080032200382003811802011009910010080000100011151182162120035800001002003920039200392003920039
802042003815000002925801081008000810080020506640132200192003820038997769989801202008003220080032200382003811802011009910010080000100011151182161220035800001002003920039200392003920039

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)18191e1f3f51schedule 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)l1d cache writeback (a8)accfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
80024200401550000039258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110910108000010200050200416662003580000102003920039200392003920039
80024200381560000039258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110910108000010001050200316532003580000102003920039200392003920139
80024200381550000039258001010800001080000506400000201002003820038999631001880010208000020800002003820038518002110910108000010001650200347542003580000102003920039200392003920039
80024200381550000039258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010000050200316352003580000102003920039200392003920039
80024200381550000039258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110910108000010000050200516542003580000102003920039200392003920039
8002420038155000001530258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110910108000010001050200316532003580000102003920039200392003920039
80024200381550000039258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110910108000010000050200516642003580000102003920039200392003920039
80024200381550000039258001010800001080000506400000200192003820038999631001880010208000020800002003820189118002110910108000010000050200516352003580000102003920039200392003920039
8002420038155000003925800101080000108000050640000020019200382003899962610018800102080000208000020038200381180021109101080000100011850200516362003580000102003920039200392003920039
80024200381610000039258001010800001080000506423040200192003820038999631001880010208000020800002003820038118002110910108000010000050200516362003580000102003920039200392003920039