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

FRINTN (vector, 4S)

Test 1: uops

Code:

  frintn v0.4s, v0.4s
  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
1004303724276125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372306125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
1004303723306125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372336125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372406125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372306125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372306125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372406125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
1004303723426125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372306125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038

Test 2: Latency 1->2

Code:

  frintn v0.4s, v0.4s
  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)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)9fld 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
102043003723200000061295472510100100100001001000050042771600300183003730037282643287451010020010000200100003003730037111020110099100100100001000000071011611296330100001003003830038300383003830038
10204300372330000006129547251010010010000100100005004277160130018300373003728264328745101002001000020010000300373003711102011009910010010000100000105071011611296330100001003003830038300383003830038
10204300372331000120612954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010000096071011611296330100001003003830038300383003830038
102043003723200000061295472510100100100001001000050042771600300183003730037282643287451010020010000200100003003730037111020110099100100100001000006071011611296330100001003003830038300383003830038
102043003723300000061295472510100100100001001000050042771600300183003730037282643287451010020010000200100003003730037111020110099100100100001000005565071011611296330100001003003830038300383003830038
10204300372320000006129547251010010010000100100005004277160030018300373003728264328745101002001000020010000300373003711102011009910010010000100000183071011611296330100001003003830038300383003830038
1020430037232000000612954725101001001000010010000500427716003001830037300372826432874510100200100002001000030037300371110201100991001001000010000078071011611296330100001003003830038300383003830038
102043003723300000010329547251010010010000100100005004277160030018300373003728264328745101002001000020010000300373003711102011009910010010000100000186071011611296330100001003003830038300383003830038
102043003723300000061295472510100100100001001000050042771600300183003730037282643287451010020010000200100003003730037111020110099100100100001000000071011611296330100001003003830038300383003830038
1020430037233000000842954725101001001000010010000500427716003001830037300372826432874510100200100002001000030037300371110201100991001001000010000011083071011611296330100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

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)a9acc2cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1002430037232000012006129547251001010100001010000504277160030018300373003728286328767100102010000201000030037300371110021109101010000100000000006402162229629010000103003830038300383003830038
100243003724100000006129547251001010100001010000504277160030018300373003728286328767100102010000201000030037300371110021109101010000100000000006402162229629010000103003830038300383003830038
100243003723300000006129547251001010100001010000504279864030018300373003728286328767100102010329201000030037301311110021109101010000100000005615006822162229701010000103003830038300383003830038
1002430037233010000018529547251001010100001010000504277160030018300373003728286328767100102010000201000030037300371110021109101010000100000000006402162229629010000103003830038300383003830086
1002430037233000000060729547251001010100001010000504277160030018300373003728286328767100102010000201000030037300371110021109101010000100000000006402162229629010000103003830038300383003830038
100243003723300000006129547251001010100001010000504277160030018300373003728286328767100102010000201000030037300371110021109101010000100000000006402162229629010000103003830038300383003830038
100243003723300000006129547251001010100001010000504277160030018300373003728286328767101632010000201000030037300371110021109101010000100000000006402162229629010000103003830038300383003830038
1002430037225000000072629547251001010100001010000504277160030018300373003728286328767100102010000201000030037300371110021109101010000100000000006402162229629010000103003830038300383003830038
1002430037224000000044129547251001010100001010000504277160030018300373003728286328767100102010000201000030037300371110021109101010000100000000006402162229629010000103003830038300383008430038
100243003722500000006129547251001010100001010000504277160030018300373003728286328767100102010000201000030037300371110021109101010000100000000016402162229629010000103003830038300383003830038

Test 3: throughput

Count: 8

Code:

  frintn v0.4s, v8.4s
  frintn v1.4s, v8.4s
  frintn v2.4s, v8.4s
  frintn v3.4s, v8.4s
  frintn v4.4s, v8.4s
  frintn v5.4s, v8.4s
  frintn v6.4s, v8.4s
  frintn v7.4s, v8.4s
  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)030918191e3f51schedule 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)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)branch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
80204200391550000302580108100800081008002050064013202002020039200399977069990801202008003220080032200392003911802011009910010080000100000011151180160020036800001002004020040200402004020040
80204200391550000302580108100800081008002050064013202002020039200399977069990801202008003220080032200392003911802011009910010080000100000311151180160020036800001002004020040200402004020040
802042003915500030302580108100800081008002050064013202002020039200399977069990801202008003220080032200392003911802011009910010080000100000011151180160020036800001002004020040200402004020040
80204200391550000722580108100800081008002050064013202002020039200399977069990801202008003220080032200392003911802011009910010080000100001011151180160020036800001002004020040200402004020040
80204200391550000302580108100800081008002050064013202002020039200399977069990801202008003220080032200392003911802011009910010080000100000011151180160020036800001002004020040200402004020040
80204200391550000302580108100800081008002050064013202002020039200399977069990801202008003220080032200392003911802011009910010080000100000011151180160020036800001002004020040200402004020040
80204200391550000302580108100800081008002050064013202002020039200399977069990801202008003220080032200392003911802011009910010080000100006011151180160020036800001002004020040200402004020040
80204200391550100582580108100800081008002050064013202002020039200399977069990801202008003220080032200392003911802011009910010080000100001611151180160020036800001002004020040200402004020040
80204200391550000302580108100800081008002050064013202002020039200399977069990801202008003220080032200392003911802011009910010080000100000911151180160020036800001002004020040200402004020040
80204200391550000582580108100800081008002050064013202002020039200399977069990801202008003220080032200392003911802011009910010080000100001011151180160020036800001002004020040200402004020040

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)l2 tlb miss instruction (0a)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)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 miss (a1)ld unit uop (a6)l1d cache writeback (a8)a9accfd0d5map dispatch bubble (d6)ddfetch restart (de)e0eb? simd retires (ee)? int retires (ef)f5f6f7f8fd
800242005015500040258001010800001080000506400000200202003920039999603100198001020800002080000200392003911800211091010800001000900502002162220036080000102004020040200402004020040
80024200391550007052580010108000010800005064000002002020039200399996031001980010208000020800002003920039118002110910108000010001306502002162220036080000102004020040200402004020040
8002420039155000822580010108000010800005064000002002020039200399996031001980010208000020800002003920039118002110910108000010001500502002162220036080000102004020040200402004020040
800242003915500040258001010801951080000506400000200202003920039999603100198001020800002080000200392003911800211091010800001000200502002162220036080000102010820040200402039720040
800242003915500040258001010800001080000506400000200202003920039999603100198001020800002080000200392003911800211091010800001000000502002162220036080000102004020040200402004020040
800242003915500040258001010800001080000506400000200202003920039999603100198001020800002080000200392003911800211091010800001000500502002162220036080000102004020040200402004020040
8002420039155000402580010108000010800005064000002002020039200399996031001980010208000020800002003920039118002110910108000010002703502002162220036080000102004020040200402004020040
8002420039155000402580010108000010800005064000002002020039200399996031001980010208000020800002003920039118002110910108000010002600502005162220036080000102004020040200402004020040
8002420039155000402580010108000010800005064000002002020039200399996031001980010208000020800002003920039118002110910108000010003003502002162220036080000102004020040200402004020040
8002420039155000822580010108000010800005064000002002020039200399996031001980010208000020800002003920039118002110910108000010002803502002162220036080000102004020040200402004020040