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

FCADD (vector, 4S)

Test 1: uops

Code:

  fcadd v0.4s, v0.4s, v1.4s, #90
  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)ld unit uop (a6)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
10043037220126254825100010001000398313130183037303724153289510001000200030373037111001100000073316222630100030383038303830383038
1004303723061254825100010001000398313030183037303724153289510001000200030373037111001100000373216222630100030383038303830383038
10043037220265254825100010001000398313030183037303724153289510001000200030373037111001100001073216222630100030383038303830383038
10043037230197254825100010001000398313030183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
10043037230107254825100010001000398313030183037303724153289510001000200030373037111001100001073216222630100030383038303830383038
10043037230229254825100010001000398313130183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
1004303723061254825100010001000398313030183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
1004303723061254825100010001000398313130183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
1004303722061254825100010001000398313130183037303724153289510001000200030373037111001100022073216222630100030383038303830383038
1004303723061254825100010001000398313130183037303724153289510001000200030373037111001100000073216222630100030383038303830383038

Test 2: Latency 1->2

Code:

  fcadd v0.4s, v0.4s, v1.4s, #90
  movi v0.16b, 1
  movi v1.16b, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 3.0037

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)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)l1d cache writeback (a8)a9accfd0d5map dispatch bubble (d6)ddfetch restart (de)e0ea? simd retires (ee)? int retires (ef)f5f6f7f8fd
1020430037225006129548251010010010000100100005004277313030018300373003728265032874510100200100002002000030037300371110201100991001001000010000000710011611296340100001003003830038300383003830038
1020430037224006129548251010010010000100100005004277313030018300373003728265032874510100200100002002000030037300371110201100991001001000010002002813710011611296340100001003003830038300383003830038
1020430037225106129548251010010010000105100005814277313030018300373003728265032874510100200101812002000030037300371110201100991001001000010000000710011611296340100001003003830038300383003830038
1020430037225006129548251010010010000100100005004277313030018300373003728265032874510100200100002002000030037300371110201100991001001000010000000710011611296340100001003003830038300383003830038
1020430037225006129548251010010010000100100005004277313030018300373003728265032874510100200100002002000030037300371110201100991001001000010000000710011611296340100001003003830038300383003830038
10204300372250061295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100000037100116112963420100001003003830038300383003830038
1020430037225006129548251010010010000100100005004277313030018300373003728265032874510100200100002002000030037300371110201100991001001000010000100710011611296340100001003003830038300383003830038
10204300372240061295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100201012710011611296340100001003003830038300383003830038
1020430037225006129548441010010010000100100005004277313030018300373007028265032874510100200100002002000030037300371110201100991001001000010000000710011611296340100001003003830038300383003830038
1020430037225036129548251010010010000100100005004277313130018300373003728265032874510100200100002002000030037300371110201100991001001000010000000710011611296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)03091e3f4e51schedule 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
10024300372250061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001003640316222963010000103003830038300383003830038
10024300372250061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001003640216222963010000103003830038300383003830038
10024300372250061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001009640216222963010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100111640216222963010000103003830038300383003830038
10024300372250061295392510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372250061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001003640216222963010000103003830038300383003830038
10024300372250061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001009640216222963010000103003830038300383003830038
10024300372240061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001003640216222963010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100117640216222963010000103003830038300383003830038
100243003722600612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010509668216222963010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  fcadd v0.4s, v1.4s, v0.4s, #90
  movi v0.16b, 1
  movi v1.16b, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 3.0037

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)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 cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
10204300372250612954825101001001000010010000500427731303001830037300372826503287451010020010000200200003003730037111020110099100100100001008107101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100037101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100037101161129702100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100037101161129634100001003003830038300383003830038
10204300372250612954825101001001000010010000500427731303001830037300372826503287451010020010000200200003003730037111020110099100100100001000787101161129634100001003003830038300383003830038
1020430037224061295482510100100100001001000050042773131300183008430037282650328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830085
1020430132225061295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003721102011009910010010000100037101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773131300183003730037282650328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042777811300183003730037282650328745101002001000020020000300373003711102011009910010010000100037101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)03l2 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)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)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
100243003722500061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010106402162229630010000103003830038300383003830227
1002430037225000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000104066402162229630010000103003830038300383003830038
1002430037225000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000105536402162229630010000103003830038300383003830038
100243007022500061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010036402162229630010000103003830038300853003830038
1002430037225000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000103596402162229630010000103003830038300383003830038
100243003722500061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
1002430037225000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000104766402162229630010000103003830038300383003830038
1002430037225000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000105906402162229630010000103003830038300383003830038
1002430037225000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000104696402162229630010000103003830038300383003830038
1002430037225000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000105406402162229630010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  fcadd v0.4s, v8.4s, v9.4s, #90
  fcadd v1.4s, v8.4s, v9.4s, #90
  fcadd v2.4s, v8.4s, v9.4s, #90
  fcadd v3.4s, v8.4s, v9.4s, #90
  fcadd v4.4s, v8.4s, v9.4s, #90
  fcadd v5.4s, v8.4s, v9.4s, #90
  fcadd v6.4s, v8.4s, v9.4s, #90
  fcadd v7.4s, v8.4s, v9.4s, #90
  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)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)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 cache writeback (a8)accfd0d2d5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
802042005715000006112580100100800001008000050064000010200202003920039997339997801002008000020016000020039200391180201100991001008000010001115110003161120036800001002004020040200402004020040
802042003915000004125801001008000010080000500640000102002020039200399973399978010020080000200160000200392003911802011009910010080000100005110001161120036800001002004020040200402004020040
802042003915000004125801001008000010080000500640000102002020039200399973399978010020080000200160000200392003911802011009910010080000100005110001161120036800001002004320040200402004020040
802042003915000004125801001008000010080000556640000102002020039200399973399978010020080106200160000200392003911802011009910010080000100005110001161120036800001002004020040200402004020040
802042003915000006425801001008000010080000500640000002002020039200399973399978010020080000200160000200392003911802011009910010080000100005110001161120036800001002004020040200402004020040
802042003915000004125801001008000010080000500640000002002020039200399973399978010020080000200160000200392003911802011009910010080000100005110001161220036800001002004020040200402004020040
802042003915000004125801001008000010080000500640000002002020039200399973399978010020080000200160000200392003911802011009910010080000100065110001161120036800001002004020040200402004020040
802042003915000004125801001008000010080000500640000002002020039200399973399978010020080000200160000200392003911802011009910010080000100005110001161120036800001002004020040200402004020040
8020420039150001204125801001008000010080000500640000102002020039200399973399978010020080000200160000200392003911802011009910010080000100105110001161120036800001002004020040200402004020040
802042003915000004125801001008000010080000500640000002002020039200399973399978010020080000200160000200392003911802011009910010080000100205110001161120036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03mmu table walk instruction (07)1e1f3f51schedule 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)61696d6emap 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
800242003915100040258001010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001000502017161772003680000102004020040200402004020040
800242003915000040258001010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001006502017161772003680000102004020040200402004020040
800242003915000040258001010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001000502071617172003680000102004020040200402004020040
80024200391500004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100050207167172003680000102004020040200402004020040
800242003915000040258001010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001000502017161772003680000102004020040200402004020040
800242003915000027225800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100050207167172003680000102004020040200402004020040
8002420039150000402580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010435020171617172003680000102004020040200402004020040
80024200391500004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100050207161772003680000102004020040200402004020040
800242003915000040258001010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001000502017167172003680000102004020040200402004020040
80024200391501004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100050207167172003680000102004020040200402004020040