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 (2D)

Test 1: uops

Code:

  sqshrun v0.2s, v0.2d, #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)0318191e3f4e51schedule 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)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
1004303723000612547251000100010003981600301830373037241432895100010001000303730371110011000073116112629100030383038303830383038
1004303723000612547251000100010003981600301830373037241432895100010001000303730371110011000173116112629100030383038303830383038
1004303723000612547251000100010003981600301830373037241432895100010001000303730371110011000073116112629100030383038303830383038
1004303723000612547251000100010003981600301830373037241432895100010001000303730371110011000073116112629100030383038303830383038
1004303723000822547251000100010003981600301830373037241432895100010001000303730371110011000073116112629100030383038303830383038
10043037221012612547251000100010003981600301830373037241432895100010001000303730371110011000073116112629100030383038303830383038
1004303722000612547251000100010003981601301830373037241432895100010001000303730371110011000073116112629100030383038303830383038
1004303723000612547251000100010003981601301830373037241432895100010001000303730371110011000073116112629100030383038303830383038
1004303722000612547251000100010003981601301830373037241432895100010001000303730371110011000073116112629100030383038303830383038
10043037230001452547251000100010003981601301830373037241432895100010001000303730371110011000073116112629100030383038303830383038

Test 2: Latency 1->2

Code:

  sqshrun v0.2s, v0.2d, #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)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)inst barrier (9c)9fl1d 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
102043003722500000006129547251010010010000100100005004277160030018300373003728264252874510100200100002001000030037300371110201100991001001000001000000000071021622296330100001003003830038300383003830038
10204300372250000000612954725101001001000010010000500427716003001830037300372826432874510100200100002001000030037300371110201100991001001000001000000000071021622296330100001003003830038300383003830038
102043003722400000007482954725101001001000010010000500427716003001830037300372826432874510100200100002001000030037300371110201100991001001000001000000000071021622296330100001003003830038300383003830038
10204300372250000000612954725101221001000010010150500427716003001830037300372826430288531104322011159222111533037130323811020110099100100100000100000121943320868372542986831100001003037130419303703037030362
10204303232270088936616045752949315910183139100161391105069642866240302703037330367282902628838111912251116422411154304183037481102011009910010010000010020000000710216222963330100001003003830227301813027230230
1020430179227116455844004653295021011017415210080132106006694289328030018302783013128264328745105842081000020610000301323022711102011009910010010000110022200296300071021622296330100001003018130181301803017930182
10204301312341121088113932945643101001001000010010000649427716013001830037300372826932874510100200100002001000030037300851110201100991001001000001000000000074124822296660100001003003830038300383003830038
10204300372250000000612954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000001000000000071021622296330100001003003830038300383003830038
10204300372250000000612954725101001001000010010000500427716003001830037300372826432874510100200100002001000030037300371110201100991001001000001000000000071021622296330100001003003830038300383003830038
102043003722500000002512954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000001000000000071021622296330100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)03l2 tlb miss data (0b)18191e3f4e51schedule 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)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
10024300372250000726295472510010101000010100005042771600300183003730037282863287671001020100002010000300373003711100211091010100001006408163429629010000103003830038300383003830038
10024300372240000726295472510010101000010100005042771600300183003730037282863287671001020100002010000300373003711100211091010100001006402164429629010000103003830038300383003830038
1002430037225000061295472510010101000010100005042771600300183003730037282863287671001020100002010000300373003711100211091010100001006404163329629010000103003830038300383003830038
1002430037225000061295472510010101000010100005042771600300183003730037282863287671001020100002010000300373003711100211091010100001006404164429629010000103003830038300383003830038
1002430037224000061295472510010101000010100005042771600300183003730037282863287671001020100002010000300373003711100211091010100001006404163429629010000103003830038300383003830038
1002430037225000061295472510010101000010100005042771600300183003730037282863287671001020100002010000300373003711100211091010100001006404414429629010000103003830038300383003830038
100243003722400005683295472510010101000010100005042771600300183003730037282863287671001020100002010000300373003711100211091010100001006403164329629010000103003830038300383003830038
1002430037225000061295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001006404164429629010000103003830038300383003830038
1002430037225000061295472510010101000010100005042771600300183003730037282863287671001020100002010000300373003711100211091010100001006404163329629010000103003830038300383003830038
10024300372250001261295472510010101000010100005042771600300183003730037282863287671001020100002010000300373003711100211091010100001006403163429629010000103003830038300383003830038

Test 3: throughput

Count: 8

Code:

  sqshrun v0.2s, v8.2d, #3
  sqshrun v1.2s, v8.2d, #3
  sqshrun v2.2s, v8.2d, #3
  sqshrun v3.2s, v8.2d, #3
  sqshrun v4.2s, v8.2d, #3
  sqshrun v5.2s, v8.2d, #3
  sqshrun v6.2s, v8.2d, #3
  sqshrun v7.2s, v8.2d, #3
  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)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)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)acbranch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)fetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
8020420039186030258010810080008100800205006401320200202003920039997769990801202008003220080032200392003911802011009910010080000100001115118216020036800001002004020040200402004020040
8020420039186930258010810080008100800205006401321200202003920039997769990801202008003220080032200392003911802011009910010080000100101115118016020036800001002004020040200402004020040
802042003918603025801081008000810080020500640132020020200392003999776999080120200800322008003220039200391180201100991001008000010001381115118016020036800001002004020040200402004020040
8020420039185030258010810080008100800205006401320200202003920039997769990801202008003220080032200392003911802011009910010080000100001115154016020036800001002004020040200402004020040
8020420039173030258010810080008100800205006401320200202003920039997769990801202008003220080032200392003911802011009910010080000100001115118016020036800001002004020040200402004020040
8020420039173030258010810080008100800205006401320200202003920039997769990801202008003220080032200392003911802011009910010080000100001115118016020036800001002004020040200402004020040
8020420039173030258010810080008100800205006401320200202003920039997769990801202008003220080032200392003911802011009910010080000100001115118016020036800001002004020040200402004020040
8020420039174030258010810080008100800205006401321200202003920039997769990801202008003220080032200392003911802011009910010080000100001115118016020036800001002004020040200402004020040
8020420039161030258010810080008100800205006401320200202003920039997769990801202008003220080032200392003911802011009910010080000100001115118025020036800001002004020040200402004020040
8020420039161030258010810080008100800205006401320200202003920039997769990801202008003220080032200392003911802011009910010080000100001115118016020036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03l2 tlb miss data (0b)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)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 miss (a1)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
8002420050151000230258001010800001080000506400002002020039200399996310019800102080000208000020039200391180021109101080000100005020416342003680000102004020040200402004020040
800242003915000040258001010800001080000506400002002020039200399996310019800102080000208000020039200391180021109101080000100005020716762003680000102004020040200402004020040
800242003915000040258001010800001080000506400002002020039200399996310019800102080000208000020039200391180021109101080000100005020616462003680000102004020040200402004020040
80024200391500004025800101080000108000050640000200202011520195999631001980010208000020800002003920039118002110910108000010001445020716672003680000102004020040200402004020040
800242003915000040258001010800001080000506400002002020039200399996310019800102080000208000020039200391180021109101080000100005020616642003680000102004020040200402004020040
800242003915000040258001010800001080000506400002002020039200399996310019800102080000208000020039200391180021109101080000100005020616342003680000102004020040200402004020040
800242003915000040258001010800001080000506400002002020039200399996310019800102080000208000020039200391180021109101080000100005020616762003680000102004020040200402004020040
800242003915000040258001010800001080000506400002002020039200399996310019800102080000208000020039200391180021109101080000100095020416452003680000102004020040200402004020040
800242003915000040258001010800001080000506400002002020039200399996310019800102080000208000020039200391180021109101080000100005020416482003680000102004020040200402004020040
800242003915000040258001010800001080000506400002002020039200399996310019800102080000208000020039200391180021109101080000100005020716662003680000102004020040200402004020040