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

URSHR (vector, 4S)

Test 1: uops

Code:

  urshr v0.4s, 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)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
10043037220612547251000100010003981603018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
10043037230612547251000100011503981603018303730372414328951000100010003037303711100110001073116112629100030383038303830383038
10043037230612547251000100010003981603018303730372414328951000100010003037303711100110007073116112629100030383038303830383038
10043037220612547251000100010003981603018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
10043037220612547251000100010003981603018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
10043037230612547251000100010003981603018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
1004303722048225382510001000100039816030183037303724143289510001000100030373037111001100004873116112629100030383038303830383038
100430372302182547251000100010003981603018303730372414328951000100010003037303711100110007073116112629100030383038303830383038
10043037220612547251000100010003981603018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372303672547251000100010003981603018303730372414328951000100010003037303711100110000073116112629100030383038303830383038

Test 2: Latency 1->2

Code:

  urshr v0.4s, 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)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)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)91inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d cache writeback (a8)a9accdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
1020430037225006129547251010010010000100100005004277160300183003730037282643287451010020010000200100003003730037111020110099300211001001000010000007101161129633100001003003830038300383003830038
102043003722500612954725101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009901001001000010000007101161129633100001003003830038300383003830038
102043003722500612954725101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009901001001000010000007101161129633100001003003830038300383003830038
1020430037225009362954725101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009901001001000010000007101161129633100001003003830038300383003830038
102043003722500612954725101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009901001001000010000007101161129633100001003003830038300383003830038
102043003722500612954725101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009901001001000010000007101161129633100001003003830038300383003830038
102043003722400612954725101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009901001001000010000007101161129633100001003003830038300383003830038
102043003722500612954725101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009901001001000010000007101161029633100001003003830038300383003830038
102043003722500612954725101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009901001001000010000007101161129633100001003003830038300383003830038
102043003722500612954725101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009901001001000010000007101161129633100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)03mmu table walk instruction (07)mmu table walk data (08)09l2 tlb miss instruction (0a)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)ld unit uop (a6)l1d cache writeback (a8)acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
10024300372240000000000612954725100101010000101000050427716013001830037300372828632876710010201000020100003003730037111002110910101000010000006403162229629010000103003830038300843003830038
10024300372240000000000612954725100101010000101000050427716013001830037300372828632876710010201000020100003003730037111002110910101000010000006402162229629010000103003830038300383003830038
10024300372250000000000612954725100101010000101000050427716013001830037300372828632876710010201000020100003003730037111002110910101000010000006402162229629010000103003830038300383003830038
10024300372250000000000612954725100101010000101000050427716013001830037300372828632876710010201000020100003003730037111002110910101000010000006402162229629010000103003830038300383003830038
10024300372250000000000612954725100101010000101000050427716013001830037300372828632876710010201000020100003003730037111002110910101000010000006402162229629010000103003830038300383003830038
10024300372250000000000612954725100101010000101000050427716013001830037300372828632876710010201000020100003003730037111002110910101000010000006402162229629010000103003830038300383003830038
10024300372250000000000612954725100101010000101000050427716013001830037300372828632876710010201000020100003003730037111002110910101000010000006402162229629010000103008530038300383003830038
10024300372264100088118870405798294576310077171006415111068742825681303063046330402283143728936110662211305221032930412304159110021109101010000102012260008183895329962610000103046430415304613046730415
10024304142260100000000823294758010089191006413112008842889391301623046330415283143928918112152211306221146730417304674110021109101010000102212253308293455729952510000103046530462304143046130464
1002430463226000108826770415872294661711008115100241811200664287976130270303713032228316112891011117241115222113063027230370611002110910101000010000006402162229989410000103032330038304643022630215

Test 3: throughput

Count: 8

Code:

  urshr v0.4s, v8.4s, #3
  urshr v1.4s, v8.4s, #3
  urshr v2.4s, v8.4s, #3
  urshr v3.4s, v8.4s, #3
  urshr v4.4s, v8.4s, #3
  urshr v5.4s, v8.4s, #3
  urshr v6.4s, v8.4s, #3
  urshr v7.4s, 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)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)9fl1d tlb miss (a1)l1d cache writeback (a8)a9acbranch 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
80204200591500360302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000000111511801602200360800001002004020040200402004020040
802042003914903510302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000300111511801600200360800001002004020040200402004020040
8020420039150000302580108100800081008002050064013212002020039200399977699908012020080032200800322003920039118020110099100100800001000000111511801600200360800001002004020040200402004020040
80204200391500210302580108100800081008002050064013212002020039200399977699908012020080032200800322003920039118020110099100100800001000000111511801600200360800001002004020040200402004020040
802042003915003570302580108100800081008002050064013212002020039200399977699908012020080032200800322008920039118020110099100100800001000000111511801600200360800001002004020040200402004020040
8020420039150000302580108100800081008002050064013212002020039200399977699908012020080032200800322003920039118020110099100100800001000000111511801600200760800001002004020040200402004020040
8020420039150000302580108100800081008002050064013212002020039200399977699908012020080032200800322003920039118020110099100100800001000000111511801600200360800001002004020040200402004020040
802042003915013060302580108100800081008002050064013212002020039200399977699908022820080032200800322003920039118020110099100100800001000003111515101600200361800001002004020040200402004020040
802042003915004080512580108100800081008002050064013212002020039200399977699908012020080032200800322003920039118020110099100100800001000000111511801600200360800001002004020040200402004020040
802042003915002820302580108100800081008002050064013212002020039200399977699908012020080032200800322003920039118020110099100100800001000000111511801600200360800001002004020040200402004020040

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)5f60696d6emap 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)accfd5map dispatch bubble (d6)ddfetch restart (de)e0eb? simd retires (ee)? int retires (ef)f5f6f7f8fd
80024200511500402580010108000010800005064000001200202003920039999631001980010208000020800002003920039118002110910108000010002150206166620036080000102004020040200402004020040
8002420039150040258001010800001080000506400000020020200392003999963100198001020800002080000200392003911800211091010800001000050202162220036080000102004020040200402004020040
8002420039150040258001010800001080000506400000120020200392003999963100198001020800002080000200392003911800211091010800001000050202162220036080000102004020040200402004020040
8002420039150040258001010800001080000506400000020020200392003999963100198001020800002080000200392003911800211091010800001000050202162620036080000102004020040200402004020040
8002420039150040258001010800001080105506400000120020200392003999963100198001020800002080000200392003911800211091010800001000050206162220036080000102004020040200402004020040
8002420039150040258001010800001080000506400000020020200392003999963100198001020800002080000200392003911800211091010800001000650203163620036080000102004020040200402004020040
8002420039150040258001010800001080000506400000020020200392003999963100198001020800002080000200392003911800211091010800001000050203166620036080000102004020040200402004020040
8002420039150040258001010800001080000506400000020020200392003999963100198001020800002080000200392003911800211091010800001000050202162620036080000102004020040200402004020040
8002420039150040258001010800001080000506400000020020200392003999963100198001020800002080000200392003911800211091010800001000050202166220036080000102004020040200402004020040
8002420039150040258001010800001080000506400000020020200392003999963100198001020800002080000200392003911800211091010800001000050202162620036080000102004020040200402004020040