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

FABD (vector, 4H)

Test 1: uops

Code:

  fabd v0.4h, v0.4h, v1.4h
  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
100430372306125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372206125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372306125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372306125482510001000100039831303018303730372415328951000100020003037303711100110001073116112630100030383038303830383038
100430372306125482510001000100039831303018303730372415328951000100020003037303711100110002973116112630100030383038303830383038
100430372206125482510001000100039831303018303730372415328951000100020003037303711100110000673116112630100030383038303830383038
100430372206125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372206125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303723061254825100010001000398313030183037303724153289510001000200030373037111001100001273116112630100030383038303830383038
100430372206125482510001000100039831303018303730372415328951000100020003037303711100110001073116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  fabd v0.4h, v0.4h, v1.4h
  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)03mmu table walk data (08)l2 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)9fl1d tlb access (a0)l1d tlb miss (a1)ld unit uop (a6)l1d cache writeback (a8)a9accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
102043003722500061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038
102043003722500061295482510100100100001121000050042786701301983032430037282653287451010020010000200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038
102043003722500061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038
102043003722500061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038
102043003722500061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038
102043003722500089295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038
1020430037225003361295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038
102043003722500061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000100007101161129634100001003003830038300383003830038
102043003722500061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038
102043003722500961295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)03mmu table walk data (08)09l2 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)a9acc2branch cond mispred nonspec (c5)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
10024300372250000012006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000000006402162229630010000103003830038300383003830038
1002430037225000000006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000000006402162229630010000103003830038300383003830038
100243003722500034162006129548251001010100001010000664277313030018300373003728287328767100102010161202000030084300371110021109101010000100000000006402162229630010000103003830038300383003830038
1002430037225000000006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000000006402162229630010000103003830038300383003830038
10024300372250000000044129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000000006402162229630010000103003830038300383003830038
1002430037225000000006129548251001010100001010000504277797030018300373003728287328786100102010000202000030037300371110021109101010000100000000006402162229630010000103003830038300383003830038
1002430037224000000006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000000006402162229630010000103003830038300383003830038
1002430037225000000006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000000006402162229630010000103003830038300383003830038
1002430037225000000006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000000006402162229630010000103003830038300383003830038
1002430037225000000006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000100006402162229630010000103013230038300383003830038

Test 3: Latency 1->3

Code:

  fabd v0.4h, v1.4h, v0.4h
  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)030918191e1f3f4e51schedule 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)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)acbranch cond mispred nonspec (c5)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
10204300372250007206129548251010010010000100100005004277313130018030037300372826503287451010020010000200200003003730037111020110099100100100001000000007421161129634100001003003830038300383003830038
10204300852250002106129548251010010010000100100005004277313030090030037300372827803287451010020010000200200003003730037111020110099100100100001002210007101161129634100001003003830038300383003830170
1020430037225100006129548251010010010000100102985974277313030018030086300852826503287451010020010000200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038
102043003722500000760295482510100100100001001000050042773130300180300373003728265017287631010020010000200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038
1020430037224000006129548251010010010000100100005004277313130018030037300372826503287451010020010000200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038
1020430037225000006129548251010010010000100100005004277313030018030037300372826503287451010020010000200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038
1020430037225000006129548251010010010000100100005004277313030018030037300372826503287451010020010000200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038
1020430037224000006129548251010010010000100100005004277313030018030037300372826503287451010020010000200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038
1020430037225000006129548251010010010000100100005004277313030018030037300372826503287451010020010000200200003003730037111020110099100100100001000000107101161129634100001003003830038300383003830038
1020430037225000006129548251010010010000100100005004277313030018030037300372826503287451010020010000200200003003730037111020110099100100100001000000117101161129634100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)031e3a3f4e51schedule 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 cache writeback (a8)cfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
1002430037225006129548251001010100001010000504277313103006403003730037282873287671001020100002020000300373003711100211091010100001006400316332963010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313003001803003730037282873287671001020100002020000300373003711100211091010100001006400316332963010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313003001803003730037282873287671001020100002020000300373003711100211091010100001006400316342963010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313003001803003730037282873287671001020100002020000300373003711100211091010100001006400316332963010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313003001803003730037282877287671001020100002020000300373003711100211091010100001006400316332963010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313003001803003730037282873287671001020100002020000300373003711100211091010100001006400316332963010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313083001803003730037282873287671001020100002020000300373003711100211091010100001006400316332963010000103003830038300383003830038
1002430037224006129548251001010100001010000504277313003001803003730037282873287671001020100002020000300373003711100211091010100001006400316332963010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313003001803003730037282873287671001020100002020000300373003711100211091010100001006400341332963010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313003001803003730037282873287671001020100002020000300373003711100211091010100001006400316332963010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  fabd v0.4h, v8.4h, v9.4h
  fabd v1.4h, v8.4h, v9.4h
  fabd v2.4h, v8.4h, v9.4h
  fabd v3.4h, v8.4h, v9.4h
  fabd v4.4h, v8.4h, v9.4h
  fabd v5.4h, v8.4h, v9.4h
  fabd v6.4h, v8.4h, v9.4h
  fabd v7.4h, v8.4h, v9.4h
  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 data (0b)1e3f51schedule 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)a9accdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
8020420039150002741258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051102161120036800001002004020040200402004020040
802042003915000041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051101161120036800001002004020040200402004020040
802042003915000041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051101161120036800001002004020040200402004020040
802042003915000041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051101161120036800001002004020040200402004020040
802042003915000041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051101161120036800001002004020040200402004020040
80204200391500027341258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051101161120036800001002004020040200402004020040
802042003915000041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010001000051101161120036800001002004020040200402004020040
802042003915000041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051101161120036800001002004020040200402004020040
802042003915100041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051101161120036800001002004020040200402004020040
8020420039150002141258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051101161120036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)0309l2 tlb miss instruction (0a)18191e1f3a3f51schedule 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)9faccfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
8002420048150000000040258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001005020191610162003680000102004020040200402004020040
8002420039150000000040258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001035020161610192003680000102004020040200402004020040
8002420039150000000040258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001005020101616162003680000102004020040200402004020040
8002420039150000000040258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001005020161616162003680000102004020040200402004020040
80024200391500000210040258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001005020101616102003680000102004020040200402004020040
8002420039150000000040258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001005020191610162003680000102004020040200402004020040
8002420039150000000040258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001005020161610202003680000102004020040200402004020040
8002420039150000000040258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001005020191610202003680000102004020040200402004020040
800242003915000000004025800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100502016169152003680000102004020040200402004020040
8002420039150000000040258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001005020161616162003680000102004020040200402004020088