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

SQSHRUN (4S)

Test 1: uops

Code:

  sqshrun v0.4h, v0.4s, #3
  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
100430372206125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372306125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372206125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372306125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
1004303722032025472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372306125472510001000100039816003018303730372414328951000100010003037303711100110000373116112629100030383038303830383038
100430372206125472510001000100039816003018303730372414328951000100010003037303711100110007073116112629100030383038303830383038
100430372306125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372306125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372206125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038

Test 2: Latency 1->2

Code:

  sqshrun v0.4h, v0.4s, #3
  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)03091e3f4e51schedule 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 cache writeback (a8)acc2cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
102043003722500128295472510100100100001001000050042771603001830037300372826432874510100200100002001000030037300371110201100991001001000010000007101161129633100001003003830038300383003830038
10204300372250061295472510100100100001001000050042771603001830037300372826432874510100200100002001000030037300371110201100991001001000010000007101161129633100001003003830038300383003830038
10204300372250061295382510100100100001001000050042771603001830037300372826432874510100200100002001000030037300371110201100991001001000010000007101161129633100001003003830038300383003830038
10204300372250061295472510100100100001001000050042771603001830037300372826432874510100200100002001000030037300371110201100991001001000010000007101161129633100001003003830038300383003830038
10204300372250061295472510100100100001001000050042771603001830037300372826432874510100200100002001000030037300371110201100991001001000010000007101161129633100001003003830038300383003830038
102043003722500103295472510100100100001001000050042771603001830037300372826432874510100200100002001000030037300371110201100991001001000010009007101161129633100001003003830038300383003830038
10204300372250061295472510100100100001001000050042771603001830037300372826432874510100200100002001000030037300371110201100991001001000010000007101161129633100001003003830038300383003830038
10204300372250084295472510100100100001001000050042771603001830037300372826432874510100200100002001000030037300371110201100991001001000010000007101161129633100001003003830038300383003830038
10204300372250061295472510100100100001001000050042771603001830037300372826432874510100200100002001000030037300371110201100991001001000010000007101161129633100001003003830038300383003830038
10204300372250061295472510100100100001001000050042771603001830037300372826432874510100200100002001000030037300371110201100991001001000010000007101161129633100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)03mmu table walk data (08)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 cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1002430037225011702954725100101010000101000050427716003001830037300852828632876710010201000020100003003730037111002110910101000010006403161329629010000103003830038300383003830038
1002430037225001912954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010006403163329629010000103003830038300383003830038
100243003722500822954725100101010000101000050427716013001830037300372828632876710010201000020100003003730037111002110910101000010006403163329629010000103003830038300383003830038
1002430037225005532954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010006403163329629010000103003830038300383003830038
10024300372250040842954725100101010000101000050427716013001830037300372828632876710010201000020100003003730037111002110910101000010006403163329629010000103003830038300383003830038
100243007722500842954725100101010000101000050427716013001830037300372828632876710010201000020100003003730037111002110910101000010006403163329629010000103003830038300383003830038
1002430037225002312954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010006403163329629010000103003830038300383003830038
100243003722500842954725100101010000101000050427716013001830037300372828632876710010201000020100003003730037111002110910101000010006403163329629010000103003830038300383003830038
100243003722500842954725100101010000101014850427716013001830037300372828632876710010201000020100003003730037111002110910101000010006403163329629010000103003830038300383003830038
100243003722500612954725100101010000101000050427716013001830037300372828632876710010201000020100003003730037111002110910101000010006403163329629010000103003830038300383003830038

Test 3: throughput

Count: 8

Code:

  sqshrun v0.4h, v8.4s, #3
  sqshrun v1.4h, v8.4s, #3
  sqshrun v2.4h, v8.4s, #3
  sqshrun v3.4h, v8.4s, #3
  sqshrun v4.4h, v8.4s, #3
  sqshrun v5.4h, v8.4s, #3
  sqshrun v6.4h, v8.4s, #3
  sqshrun v7.4h, v8.4s, #3
  movi v8.16b, 9

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code divided by count): 0.2506

retire uop (01)cycle (02)03181e3f51schedule 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 cache writeback (a8)c2branch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
802042006015000302580108100800081008002050064013212002002003920039997706999080120200800322008003220039200391180201100991001008000010000111511811611200360800001002004020040200402004020040
802042003915000302580108100800081008002050064013212002002003920039997706999080120200800322008003220039200391180201100991001008000010000111511811612200360800001002004020040200402004020040
802042003915000302580108100800081008002050064013212002002003920039997706999080120200800322008003220039200391180201100991001008000010000111511811622200360800001002004020040200402004020040
802042003915000302580108100800081008002050064013212002002003920039997706999080120200800322008003220039200391180201100991001008000010000111511821614200360800001002004020040200402004020040
802042003915000302580108100800081008002050064013212002002003920039997706999080120200800322008003220039200391180201100991001008000010000222512822331200450800001002004920049200492004920049
8020420049150006426801161008001610080028500640196020029020048200499976010998680128200800382008003820049200481180201100991001008000010000222512922323200450800001002004920049200492005020050
802042004815000642680116100800161008002850064019612002902004820048997609998680128200800382008003820048200481180201100991001008000010000222512932323200460800001002004920049200492004920049
802042004915000642680116100800161008002850064019612002902004820048997609998680128200800382008003820048200481180201100991001008000010000222512922334200450800001002004920049200502005020050
8020420048150006426801161008001610080028500640196120029020049200489976010998680128200800382008003820048200481180201100991001008000010000222512932311200450800001002005020049200492004920049
802042004915000642680116100800161008002850064019612002902004920048997609998680128200800382008003820049200491180201100991001008000010000222512922332200450800001002004920049200492004920049

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)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)696b6d6emap 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)ld unit uop (a6)st unit uop (a7)l1d cache writeback (a8)a9acc2cfd5map dispatch bubble (d6)daddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
800242004015100000004025800101080000108000050640000200200200392003999960310019800102080000208000020039200391180021109101080000100000000050204160552003680000102004020040200402004020040
800242003915000000004025800101080000108000050640000200200200392003999960310019800102080000208000020039200391180021109101080000100000000050201160722003680000102004020040200402004020040
800242003915000000004025800101080000108000050640000200200200392003999960310019800102080000208000020039200391180021109101080000100000000050202160532003680000102004020040200402004020040
800242003915000000004025800101080000108000050640000200200200392003999960310019800102080000208000020039200391180021109101080000100000000050201160322003680000102004020040200402004020040
800242003915000000004025800101080000108000050640000200200200392003999960310019800102080000208000020039200391180021109101080000100000000050201160422003680000102004020040200402004020040
800242003915000000004025800101080000108000050640000200200200392003999960310019800102080000208000020039200391180021109101080000100000000050202160632003680000102004020040200402004020040
800242003915000000004025800101080000108000050640000200200200392003999960310019800102080000208000020039200391180021109101080000100000000050201160362003680000102004020040200402004020040
800242003915000000004025800101080000108000050640000200200200392003999960310019800102080000208000020039200391180021109101080000100000000050202160332003680000102004020040200402004020040
800242003915000000304025800101080000108000050640000200203200392003999960310019800102080000208000020039200391180021109101080000100000100050202160252003680000102004020040200402004020040
800242003915000000004025800101080000108000050640000200200200392003999960310019800102080000208000020039200391180021109101080000100000000050201160362003680000102004020040200402004020040