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

FCVTZS (vector, integer, 2S)

Test 1: uops

Code:

  fcvtzs v0.2s, v0.2s
  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)03191e1f3f4e51schedule 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)acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
100430372406061254725100010001000398160030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
100430372400061254725100010001000398160030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
100430372400061254725100010001000398160030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
100430372500061254725100010001000398160030183037303724143289510001000100030373037111001100003073116112629100030383038303830383038
100430372300061254725100010001000398160030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
100430372506061254725100010001000398160130183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
100430372400061254725100010001000398160030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
1004303724015061254725100010001000398160030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
100430372400089254725100010001000398160030183085318124143289510001000100030373037111001100000073116112629100030383038303830383038
100430372500061254725100010001000398160030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038

Test 2: Latency 1->2

Code:

  fcvtzs v0.2s, v0.2s
  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)696d6emap 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)acbranch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0ea? simd retires (ee)? int retires (ef)f5f6f7f8fd
102043003722500000612954725101001001000010010000500427716030018300373003728264032874510100200100002001000030037300371110201100991001001000010000071021622296332100001003003830038300383003830038
102043003722400000612954725101001001000010010000500427716030018300373003728264032874510100200100002001000030037300371110201100991001001000010000071021622296330100001003003830038300383003830038
102043003722500000612954725101001001000010010000500427716030018300373003728264032874510100200100002001000030037300371110201100991001001000010000071021632296330100001003003830038300383003830038
102043003722500000612954725101001001000010010000500427716030018300373003728264032874510100200100002001000030037300371110201100991001001000010000071021622296330100001003003830038300383003830038
102043003722500000612954725101001001000010010000500427716030018300373003728264032874510100200100002001000030037300371110201100991001001000010000071021622296330100001003003830038300383003830038
102043003722500000612954725101001001000010010000500427716030018300373003728264032874510100200100002001000030037300371110201100991001001000010000171021622296330100001003003830038300383003830038
102043003722400000612954725101001001000010010000500427716030018300373003728264032874510100200100002001000030037300371110201100991001001000010000071021622296330100001003003830038300383003830038
102043003722500000612954725101001001000010010000500427716030018300373003728264032874510100200100002001000030037300371110201100991001001000010000071021622296330100001003003830038300383003830038
102043003722500000612954725101001001000010010000500427716030018300373003728264032874510100200100002001000030037300371110201100991001001000010000071021622296330100001003003830038300383003830038
1020430037225000006129547251010010010000100100005004277160300183003730037282640262874510100200100002001000030037300371110201100991001001000010000071021622296330100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)0309l2 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)60696b6d6emap 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)l1d cache writeback (a8)acbranch cond mispred nonspec (c5)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
100243003722500072629547421001810100241010000504277160030018030037300372828632876710010201000020100003003730037111002110910101000010001080640216222962910000103003830038300383003830038
100243003722500061295472510010101000010100005042771600300183300373003728286328767100102010000201000030037300371110021109101010000100000640216222962910000103003830038300383003830038
100243003722400025129547251001010100001010000504277160130018030037300372828632876710010201000020100003003730037111002110910101000010001770640216222962910000103003830038300383003830038
10024300372250006129547251001010100001010000504277160030018030037300372828632876710010201000020100003003730037111002110910101000010001470640216222962910000103003830038300713003830038
1002430037225000612954725100101010000101000050427716013001803003730037282863287671001020100002010000300373003711100211091010100001000120640216222962910000103003830038300383003830038
10024300372240006312954725100101010000101000050427716003001803003730037282863287671001020100002010000300373003711100211091010100001000990640216222962910000103003830038300383003830038
100243003722400072629547251001010100001010000504277160030018030037300372828632876710010201000020100003003730037111002110910101000010001200640216222962910000103003830038300383003830038
10024300372240006129547251001010100001010000504277160130018030037300372828632876710010201000020100003003730037111002110910101000010001200640216222962910000103003830038300383003830038
10024300372250006129547251001010100001010000504277160030018030037300372828632876710010201000020100003003730037111002110910101000010001380640216222962910000103003830038300383003830038
10024300372250006129547251001010100001010000504277160030018030037300372828632876710010201000020100003003730037111002110910101000010001260640216222962910000103003830038300383003830038

Test 3: throughput

Count: 8

Code:

  fcvtzs v0.2s, v8.2s
  fcvtzs v1.2s, v8.2s
  fcvtzs v2.2s, v8.2s
  fcvtzs v3.2s, v8.2s
  fcvtzs v4.2s, v8.2s
  fcvtzs v5.2s, v8.2s
  fcvtzs v6.2s, v8.2s
  fcvtzs v7.2s, v8.2s
  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)09l2 tlb miss data (0b)18191e1f3f51schedule 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)a9acbranch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
80204200391550000012010025801081008000810080020500640132020020200392003999776999080120200800322008003220039201921180201100991001008000010000000011151180160020036800001002004020040200402004020040
802042003915500000003025801081008000810080020500640132120020200392003999776999080438200800322008003220039200391180201100991001008000010000000011151180160020036800001002004020139200402004020040
802042003916100000004425801081008000810080020500640132120020200392003999776999080120200800322008003220039200391180201100991001008000010000200011151180160020036800001002004020040200402004020040
8020420039156000301203025801081008000810080020500640132120020200392003999776999080120200800322008003220039200391180201100991001008000010000000611151180160020036800001002004020040200402024820040
802042003915500000003025801081008000810080020500640132120020200392003999776999080120200800322008003220039200391180201100991001008000010000000011151180160020036800001002004020040200402004020040
802042003915500000003025801081008000810080020500640132120020200392003999776999080120200800322008003220039200391180201100991001008000010000010311151180160020036800001002004020040200402004020040
802042003915500000003025801081008000810080020500640132020020200392003999776999080120200800322008003220039200391180201100991001008000010000000011151180160020036800001002004020040200402004020040
8020420039155000000022025801081008000810080020500640132020020200392003999776999080120200800322008003220039200391180201100991001008000010000000011151180160020036800001002004020040200402004020040
802042003915500000003025801081008000810080020500640132120020200392003999776999080534200800322008003220039200391180201100991001008000010000000311151180160020036800001002014220040200402004020040
8020420039155000000014225801081008000810080020500640132020020200392003999776999080120200800322008003220039200391180201100991001008000010000000011151180160020036800001002004020040200402004020040

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)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)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)accfl1i cache miss demand (d3)l1i tlb miss demand (d4)d5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
80024200511551004025800101080000108000050640000020020200392003999963100198001020800002080000200392003921800211091010800001020475502001916572003680000102004020040200402004020040
800242003915500082258001010800001080000506400001200202003920039999631001980010208000020800002003920039118002110910108000010000502001716892003680000102004020040200402004020040
800242003916000040258001010800001080000506400000200202003920039999631001980010208000020800002003920039118002110910108000010000502001516572003680000102004020040200402004020040
800242003915501204025800101080000108000050640000020020200392003999963100198001020800002080000200392003911800211091010800001000050200210161192003680000102004020040200402004020040
800242003915500040258001010800001080000506400001200202003920039999631001980010208000020800002003920092118002110910108000010000502002716572003680000102004020040200402004020040
800242003915500040258001010800001080000506400001200202003920039999631001980010208000020800002003920039118002110910108000010000502002916562003680000102004020040200402004020040
8002420039155000402580010108000010800005064000012002020039200399996310019800102080000208000020039200391180021109101080000100005020021116782003680000102004020040200402004020040
800242003915500040258001010800001080000506400001200202003920039999631001980010208000020800002003920039118002110910108000010000502001416482003680000102004020040200402004020040
8002420039155000135258001010800001080000506400001200202003920039999631001980010208000020800002003920039118002110910108000010000502001516882003680000102004020040200402004020040
8002420039156000402580010108000010800005064000002002020039200399996310019800102080000208000020039200391180021109101080000100005020015167102003680000102004020040200402004020040