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

UCVTF (vector, integer, 2D from 2D)

Test 1: uops

Code:

  ucvtf 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)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)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
10043037230612547251000100010003981603018303730372414328951000100010003037303711100110003073116112701100030383038303830383038
10043037240612547251000100010003981603018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
10043037240612547251000100010003981603018303730372414328951000100010003037303711100110001373116112629100030383038303830383038
10043037230612547251000100010003981603018303730372414328951000100010003037303711100110000973116112629100030383038303830383038
10043037240612547251000100010003981603018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
10043037240612547251000100010003981603018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
10043037240612547251000100010003996773018303730372414328951000100010003037303711100110000373116112629100030383038303830383038
10043037230612547251000100010003981603018303730372414328951000100010003037303711100110000673116112629100030383038303830383038
10043037240612547251000100010003981603018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
10043037230612547251000100010003981603018303730372414328951000100010003037303711100110000673116112629100030383038303830383038

Test 2: Latency 1->2

Code:

  ucvtf 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)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)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
102043003723306129547251010010010000100100005004277160130018300373003728264328745101002001000020010000300373003711102011009910010010000100007101161129633100001003003830038300383003830038
102043003723309929547251010010010000100100005004277160130018300373003728264328745101002001000020010000300373003711102011009910010010000100007101161129633100001003003830038300383003830038
10204300372321276829547251010010010000100100005004277160130018300373003728264328745101002001000020010000300373003711102011009910010010000100007101161129633100001003003830038300383003830038
102043003723336129547621010010010000100100005004277160130018300373003728264328745101002001000020010000300373003711102011009910010010000100007101161129633100001003003830038300383003830038
102043003723306129547251010010010000100100005004277160130018300373003728264328745101002001000020010000300373003711102011009910010010000100007101161129633100001003003830038300383003830038
102043003723306129547251010010010000100100005004277160030018300373003728264328745101002001000020010000300373003711102011009910010010000100007101161129633100001003003830038300383003830038
102043003723306129547251010010010000100100005004277160130018300373003728264328745101002001000020010000300373003711102011009910010010000100007101161129633100001003003830038300383003830038
102043003723308929547251010010010000100100005004277160130018300373003728264328745101002001000020010000300373003711102011009910010010000100007101161129633100001003003830038300383003830038
102043003723306129547251010010010000100100005004277160130018300373003728264328745101002001000020010000300373003711102011009910010010000100107101161129633100001003003830038300383003830038
102043003723306129547251010010010000100100005004277160130018300373003728264328745101002001000020010000300373003711102011009910010010000100007101161129633100001003003830038300383003830038

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 miss (a1)ld unit uop (a6)l1d cache writeback (a8)a9acc2branch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
10024300372250000000411295472510010101000010100005042771600300183003730037282863287671001020100002010000300373003711100211091010100001000000006403163329629010000103003830038300383003830038
1002430084225000000082295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000006403163329629010000103003830038300383003830038
10024300372250000000103295472510010101000010100005042771600300183003730037282866287671001020100002010000300373003711100211091010100001000000006403163329629010000103003830038300383003830038
1002430037225000000061295472510010101000010100005042771600300183003730037282863287671001020100002010000300373003711100211091010100001000000006403163329629010000103003830038300383003830038
1002430037224000000061295472510010101000010100005042771600300183003730037282863287671001020100002010000300373003711100211091010100001000000006403163329629010000103003830038300383003830038
1002430037224000000061295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000006403163329629010000103003830038300383003830038
100243003722500000002128295472510010101000010100005042771600300183003730037282863287671001020100002010000300373003711100211091010100001000000006403163329629010000103003830038300383003830038
100243003722500000001415295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000006403163329629010000103003830038300383003830038
1002430037225000000061295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000006613163329629010000103003830038300383003830038
1002430037225000000061295472510010101000010100005042771600300183003730037282863287671001020100002010000300373003711100211091010100001000000006403163329629010000103003830038300383003830038

Test 3: throughput

Count: 8

Code:

  ucvtf v0.2d, v8.2d
  ucvtf v1.2d, v8.2d
  ucvtf v2.2d, v8.2d
  ucvtf v3.2d, v8.2d
  ucvtf v4.2d, v8.2d
  ucvtf v5.2d, v8.2d
  ucvtf v6.2d, v8.2d
  ucvtf 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)031e1f3f51schedule 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 tlb access (a0)ld unit uop (a6)st unit uop (a7)l1d cache writeback (a8)a9abacc2branch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
802042004915512030258010810080008100800205006401322002020039200399977699908012020080032200800322003920039118020110099100100800001000000000011151183163420036800001002004020040200402004020040
80204200391550030258010810080008100800205006401322002020039200399977699908012020080032200800322003920039118020110099100100800001000300000011151183162320036800001002004020040200402004020040
80204200391550030258010810080008100800205006401322002020039200399977699908012020080032200800322003920039118020110099100100800001000000000011151183163420036800001002004020040200402004020040
80204200391550030258010810080008100800205006401322002020039200399977699908012020080032200800322003920039118020110099100100800001000000000011151183164420036800001002004020040200402004020040
80204200391550030258010810080008100800205006401322002020039200399977699908012020080032200800322003920039118020110099100100800001000000000011151183163320036800001002009020040200402004020040
80204200391550030258010810080008100800205006401322002020039200399977699908012020080032200800322003920039118020110099100100800001000000000011151184164420036800001002004020040200402004020040
80204200391610030258010810080008100800205006401322002020039200399977699908012020080032200800322003920039118020110099100100800001000000000011151182164320036800001002004020040200402004020040
8020420039155297030258010810280008100800205006401322002020039200399977699908023220080032200800322003920039118020110099100100800001000000000011151183164420036800001002004020040200402004020040
80204200391550030258010810080008100801265006401322002020039200399995699908012020080032200800322003920039118020110099100100800001000003000011151183164320036800001002004020040200402004020040
80204200391550080258010810080008100800205006401322014020039200399977699908012020080032200800322003920039118020110099100100800001000000000011151183163320036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)031e3f51schedule 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)5f696d6emap 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)l1d cache writeback (a8)acb5cfd0d2l1i cache miss demand (d3)d5map dispatch bubble (d6)ddfetch restart (de)e0ea? simd retires (ee)? int retires (ef)f5f6f7f8fd
80024200501550822580010108000010800005064000002002020039200399996310019800102080000208000020039200391180021109101080000100000050200103163220036080000102004020040200402004020040
80024200391550402580010108000010800005064000002002020039200399996310019800102080000208000020039200391180021109101080000100000050200003162320036080000102004020040200402004020040
80024200391550405080010108000010800005064000002002020039200399996310019800102080000208000020039200391180021109101080000100200050200003163220036080000102004020040200402004020040
80024200391560402580010108000010800005064000002002020039200399996310019800102080000208000020039200391180021109101080000100000050200003163220036080000102004020040200402004020040
800242003915502752580010108000010800005064000002002020039200399996310019800102080000208000020039200391180021109101080000100000050200003163220036080000102004020040200402004020040
80024200391550402580010108000010800005064000002002020039200399996310019800102080000208000020039200391180021109101080000100000050200003163320036080000102004020040200402004020040
80024200391550402580010108000010800005064000002002020039200399996310019800102080000208000020039200391180021109101080000100009050200003163220036080000102004020040200402004020040
80024200391550402580010108000010800005064000002002020039200399996310019800102080000208000020039200391180021109101080000100000050200003162320036080000102004020040200402004020040
80024200391560452580010108000010800005064000002002020039200399996310019800102080000208000020039200391180021109101080000100000050200002163320036080000102004020040200402004020040
80024200391550402580010108000010800005064000002002020039200399996310019800102080000208000020039200391180021109101080000100100050200003163320036080000102004020040200402004020040