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

FCVTZU (vector, integer, 2D)

Test 1: uops

Code:

  fcvtzu v0.2d, 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)03l2 tlb miss instruction (0a)181e3f4e51schedule 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
10043037232006125472510001000100039816013018303730372414328951000100010003037303711100110000073216222629100030383038303830383038
100430372320017025472510001000100039816013018303730372414328951000100010003037303711100110000073216222629100030383038303830383038
100430372320014525472510001000100039816013018303730372414328951000100010003037303711100110000073216222629100030383038303830383038
100430372320012725472510001000100039816013018303730372414328951000100010003037303711100110000073216222629100030383038303830383038
10043037242006125472510001000100039816013018303730372414328951000100010003037303711100110000073216222629100030383038303830383038
100430372320010325472510001000100039816013018303730372414328951000100010003037303711100110000073216222629100030383038303830383038
100430372320010325472510001000100039816013018303730372414328951000100010003037303711100110000373216222629100030383038303830383038
10043037252006125472510001000100039816013018303730372414328951000100010003037303711100110000073216222629100030383038303830383038
10043037252006125472510001000100039816003018303730372414328951000100010003037303711100110000073216222629100030383038303830383038
10043037242006125472510001000100039816013018303730372414328951000100010003037303711100110000073216222629100030383038303830383038

Test 2: Latency 1->2

Code:

  fcvtzu v0.2d, 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): 3.0037

retire uop (01)cycle (02)03181e3f4e51schedule 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)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)ea? simd retires (ee)? int retires (ef)f5f6f7f8fd
10204300372320336129547251010010010000100100005004277160300183003730037282643287451010020010000200100003003730037111020110099100100100001000100710116112963300100001003003830038300383003830038
10204300372330336129547251010010010000100100005004277160300183003730037282643287451010020010000200100003003730037111020110099100100100001000000710116112963300100001003003830038300383003830038
102043003723304746129547251010010010000100100005004277160300183003730037282643287451010020010000200100003003730037111020110099100100100001000000710116112963300100001003003830038300383003830038
10204300372330308929547251010010010000100100005004277160300183003730037282643287451010020010000200100003003730037111020110099100100100001000000710116112963300100001003003830038300383008530038
10204300372330126129547251010010010000100100005004277160300183003730037282643287451010020010000200100003003730037111020110099100100100001000000710116112963300100001003003830038300383003830038
10204300372320186129547251010010010000100100005004277160300183003730037282643287451010020010000200100003003730037111020110099100100100001000000710116112963300100001003003830038300383003830038
1020430037232006129547251010010010000100100005004277160300183003730037282643287451010020010000200100003003730037111020110099100100100001000000710116112963300100001003003830038300383003830038
102043003723301597429547251010010010000100100005004277160300183003730037282643287451010020010000200100003003730037111020110099100100100001000000710116112963300100001003003830038300383003830038
1020430037233066129547251010010010000100100005004277160300183003730037282643287451010020010000200100003003730037111020110099100100100001000000710116112963300100001003003830038300383003830038
1020430037232006129547251010010010000100100005004277160300183003730037282643287451010020010000200100003003730037111020110099100100100001000000710116112963300100001003003830038300383003830038

1000 unrolls and 10 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)696b6d6emap 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? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
100243003722525515629547251001010100001010000504277160300180300373003728286328767100102010000201000030037300371110021109101010000100006404162229629010000103003830038300383003830038
1002430037225072629547251001010100001010000504277160300180300373003728286328767100102010000201000030037300371110021109101010000100006402162229629010000103003830038300383003830038
1002430037225072629547251001010100001010000504277160300180300373003728286328767100102010000201000030037300371110021109101010000100006542162229629010000103003830038300383003830086
10024300372252434629547251001010100001010000504277160300180300373003728286328767100102010000201000030037300371110021109101010000100006402162229629010000103003830038300383003830038
1002430037225306129547251001010100001210000604277160300180300373003728286328767100122010000201000030037300371110021109101010000100006422162229629010000103003830038300383003830038
1002430037225396129547251001010100001010000504277160300180300373003728286328767100102010000201000030037300371110021109101010000100006402162629631010000103003830038300383003830038
100243003722506129547251001010100001010000504277160300180300373003728286328767100102010000201000030037300371110021109101010000100006402162229629010000103003830038300383003830038
100243003722566129547251001010100001010000504277160300180300373003728286328767100102010000201000030037300371110021109101010000100006402162229629010000103003830038300383003830038
1002430037225308929547251001212100001210000504277160300183300373003728286328767100102010000201000030037300371110021109101010000100006402162229629010000103003830038300383003830038
100243003722566129547251001010100001010000504277160300180300373003728286328767100102010000201000030037300371110021109101010000100006402162229629010000103003830038300383003830038

Test 3: throughput

Count: 8

Code:

  fcvtzu v0.2d, v8.2d
  fcvtzu v1.2d, v8.2d
  fcvtzu v2.2d, v8.2d
  fcvtzu v3.2d, v8.2d
  fcvtzu v4.2d, v8.2d
  fcvtzu v5.2d, v8.2d
  fcvtzu v6.2d, v8.2d
  fcvtzu v7.2d, 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)0918191e1f3f51schedule 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)st unit uop (a7)l1d cache writeback (a8)a9acc2branch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
8020420048155000000302580108100800081008002050064013212002020039201969977699908012020080032200800322003920039118020110099100100800001000001000111511801620036800001002004020040200402004020040
8020420039156000090302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039418020110099100100800001000001000111511801620036800001002004020040200402004020040
8020420039156000000302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000000000111511801620036800001002004020040200402004020040
8020420039155000000302580108100800081008002050064013202002020039200399977699908012020080346200800322003920039118020110099100100800001000000000111511801620036800001002004020040200402004020040
802042024715500002103342580108100800081008002050064013202018020039200399977699908012020080032200800322003920039118020110099100100800001000000000111511801620036800001002004020040200402004020040
80204200391550000630302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000000000111511801620036800001002004020040200402004020040
8020420039155000000722580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000000000111511801720036800001002004020040200402004020040
802042003915500004680302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000000000111511801620036800001002004020040200402004020040
80204200391550000002522580108100800081008002050064013212002020039200399977699908012020080032200800322003920241118020110099100100800001000000000111511801620119800001002004020040200402004020040
802042003915600000352302580108100800081008002050064013212002020039200399977699908012020080032200800322003920039118020110099100100800001000000000111511801620036800001002004020040200402004020040

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)18191e3a3f51schedule 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 cache writeback (a8)acc2cfd5map dispatch bubble (d6)d9dcddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
800242003915600000402580010108000010800005064000012002020039200399996310019800102080000208000020039200391180021109101080000100000502061620532003680000102004020152201542004020040
80024201021550103151614380010108009610802095064083602002020039200399996310019800102080000208000020039200391180021109101080000100000502031600352003680000102004020040200402004020040
8002420039155000120402580010108000010800005064000012002020039200899996310019800102080000208000020039200391180021109101080000100000502031600352003680000102004020040200932004020040
80024200391550003540402580010108000010800005064000002002020039200399996310019800102080000208000020039200391180021109101080000100030502041600352003680000102004020040200402004020040
80024200391550001590402580010108000010800005064000012002020039200399996310019800102080000208000020039200391180021109101080000100000502061600632003680000102004020040200402004020040
80024201121561002700402580010108000010800005064000002002020039200399996310019800102080000208000020039200391180021109101080000100000502061600562003680000102004020040200402004020040
800242003915500060402580010108000010800005064000002002020039200399996310019800102080000208000020092200391180021109101080000100000502031600542003680000102004020040200402004020040
8002420039156000510612580010108000010800005064000002002020039200399996310019800102080000208000020039200391180021109101080000100100502031600532003680000102004020040200402004020040
8002420039155000008472580010108009610800005064000012002020039200399996310019800102080000208000020039200391180021109101080000100200502051600642003680000102004020040200402004020040
8002420039155000270402580010108000010800005064000012002020039200399996310019800102080000208000020039200391180021109101080000100000502051600532007680000102004020040200402004020040