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

FCMEQ (vector, zero, 8H)

Test 1: uops

Code:

  fcmeq v0.8h, v0.8h, #0
  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)696d6emap 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)acc2c3cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
10042037151561168625100010001000264521201820372037157131895100010001000203720371110011000000073116111786100020382038203820382038
1004203715961168625100010001000264521201820372037157131895100010001000203720371110011000000073116111786100020382038203820382038
1004203715661168625100010001000264521201820372037157131895100010001000203720371110011000000073116111786100020382038203820382038
10042037151561168625100010001000264521201820372037157131895100010001000203720371110011000000073116111786100020382038203820382038
10042037153156168625100010001000264521201820372037157131895100010001000203720371110011000001073116111786100020382038203820382038
10042037159141168625100010001000264521201820372037157131895100010001000203720371110011000000073116111786100020382038203820382038
10042037161561168625100010001000264521201820372037157131895100010001000203720371110011000000073116111786100020382038203820382038
1004203716661168625100010001000264521201820372037157131895100010001000203720371110011000000073116111786100020382038203820382038
1004203715961168625100010001000264521201820372037157131895100010001000203720371110011000000073116111786100020382038203820382038
1004203715061168625100010001000264521201820372037157131895100010001000203720371110011000000073116111786100020382038203820382038

Test 2: Latency 1->2

Code:

  fcmeq v0.8h, v0.8h, #0
  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)1e3f4e51schedule 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)9fcfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
10204200371500061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001007102162219791100001002003820038200382003820038
10204200371500061196862510100100100001001000050028475210200182003720037184213187451010020010000200101672003720037111020110099100100100001007102162319791100001002003820038200382003820038
10204200371500061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001007102162219791100001002003820038200382003820038
10204200371500061196862510100100100001001000050028475210200182003720037184213187451010020010000200100002003720037111020110099100100100001007102162219791100001002003820038200382003820038
10204200371500061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001007102162219791100001002003820038200382003820038
1020420037150013261196862510100100100001001000052228487851200182003720037184213187451010020010000200100002003720037111020110099100100100001007102162219791100001002003820038200382008520038
10204200371500061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001007102162219791100001002003820038200382003820038
1020420037150056161196862510100100100001001000050028475210200182003720037184213187451010020010000200100002003720037111020110099100100100001007102162219791100001002003820038200382003820038
10204200371500061196862510100100100001001000050028475210200182003720084184213187451010020010000200100002003720037111020110099100100100001007102162219791100001002003820038200382003820038
10204200371500961196862510100100100001001000050028475210200182003720037184213187451010020010000200100002003720037111020110099100100100001007352162219791100001002003820038200382003820038

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)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)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
100242003715000013001031968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000000306402162219786010000102003820038200382003820038
10024200371500100231002511967525100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000010006402162219786010000102003820038200382003820038
10024200371500000000611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000010006402162219786010000102003820038200382003820038
10024200371500000000611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
10024200371500000000611968625100101010000101015250284752102001820037200371844331876710010201000020100002003720037211002110910101000010000000006402242219822010000102003820038200382003820038
10024200371500000000611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010000000007272162219786010000102003820038200382003820038
100242003715000001200611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000010306402162219786010000102003820038200382003820038
100242003715000001200611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
10024200371500000000821968645100101010000101000050284752112005420037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
100242003715000002700611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  fcmeq v0.8h, v8.8h, #0
  fcmeq v1.8h, v8.8h, #0
  fcmeq v2.8h, v8.8h, #0
  fcmeq v3.8h, v8.8h, #0
  fcmeq v4.8h, v8.8h, #0
  fcmeq v5.8h, v8.8h, #0
  fcmeq v6.8h, v8.8h, #0
  fcmeq v7.8h, v8.8h, #0
  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)03181e1f3f51schedule 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)9fld unit uop (a6)l1d cache writeback (a8)acbranch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
8020420061150100292580108100800081008002050064013220019200382003899776998980120200800322008003220038200381180201100991001008000010000011151181160020035800001002003920039200392003920039
8020420038150000292580108100800081008002050064013220019200382003899776998980120200800322008003220038200381180201100991001008000010000011151180160020035800001002003920039200392003920039
8020420038150000292580108100800081008002050064013220019200382003899776998980120200800322008003220038200381180201100991001008000010000011151180160020035800001002003920039200392003920039
8020420038150000292580108100800081008002050064013220019200382003899776998980120200800322008003220038200381180201100991001008000010000011151180160020035800001002003920039200392003920039
8020420038150000292580108100800081008002050064013220019200382003899776998980120200800322008003220038200381180201100991001008000010000011151180160020035800001002003920039200392003920039
8020420038150000292580108100800081008002050064013220019200382003899776998980120200800322008003220038200381180201100991001008000010000011151180160020035800001002003920039200392003920039
8020420038150060292580108100800081008002050064013220019200382003899776998980120200800322008003220038200381180201100991001008000010000012251281231120046800001002005020049200492004920049
8020420048150000642680116100800161008002850064019620028200482004899769998680128200800382008003820048200481180201100991001008000010000022251281231120046800001002005020050200502005020050
8020420090150000642680116100800161008002850064019620028200492004899769998680128200800382008003820049200481180201100991001008000010000022251281231520123800001002004920050200502004920049
8020420048150000642680116100800161008002850064019620028200492004999769998680128200800382008003820049200491180201100991001008000010000022251291231120045800001002004920049200492004920049

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03l1i tlb fill (04)091e3f51schedule 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)branch mispred nonspec (cb)cfl1i tlb miss demand (d4)d5map dispatch bubble (d6)ddfetch restart (de)e0eaeb? simd retires (ee)? int retires (ef)f5f6f7f8fd
800242005015000085258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010005020016161717200350080000102003920039200392003920039
80024200381501108525800101080000108000050640000120019200382003899963100188001020800002080000200652003811800211091010800001000502118161816200350080000102003920039200392003920039
800242003815011085258001010800001080000506400001200192003820038999631001880010208000020800002004920038118002110910108000010015020017161717200350080000102003920039200392003920039
80024200381501108525800101080000108000050640000120019200382003899963100188001020800002080000200382003811800211091010800001000502111716169200350080000102003920039200392003920039
800242003815011016925800101080000108000050640000120019200382003899963100188001020800002080000200652003811800211091010800001020502111616179200350080000102003920039200392003920039
800242003815011085258001010800001080000506400001200192003820038999631001880010208000020800002004920038118002110910108000010005021117161716200350080000102003920039200392003920039
800242003815011085258001010800001080000506400001200192003820038999631001880010208000020800002004920038118002110910108000010005021114161717200350080000102003920039200392003920039
800242003815011085258001010800001080000506400001200192003820038999631001880010208000020800002006520038118002110910108000010005021117161714200350080000102003920039200392003920039
80024200381501108525800101080000108000050640000120019200382003899963100188001020800002080000200492003811800211091010800001000502111616917200350080000102003920039200392003920039
800242003815011085258001010800001080000506400001200192003820038999631001880010208000020800002004920038118002110910108000010005021113161017200350080000102003920039200392003920039