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

UQXTN (4S)

Test 1: uops

Code:

  uqxtn v0.4h, v0.4s
  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)60696b6d6emap 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
100430372396125472510001000100039816013018030373037241432895100010001000303730371110011000073116112629100030383038303830383038
100430372206125472510001000100039816013018030373037241432895100010001000303730371110011000073116112629100030383038303830383038
100430372206125472510001000100039816013018030373037241432895100010001000303730371110011000073116112629100030383038303830383038
100430372306125472510001000100039816003018030373037241532895100010001000303730371110011000073116112629100030383038303830383038
100430372236125472510001000100039816003018030373037241432895100010001000303730371110011000073116112629100030383038303830383038
100430372306125472510001000100039816003018030373037241432895100010001000303730371110011000073116112629100030383038303830383038
100430372206125472510001000100039816003018030373037241432895100010001000303730371110011000073116112629100030383038303830383038
100430372206125472510001000100039816003018030373037241432895100010001000303730371110011000073116112629100030383038303830383038
100430372306125472510001000100039816003018030373037241432895100010001000303730371110011000073116112629100030383038303830383038
100430372206125472510001000100039816003018030373037241432895100010001000303730371110011000073116112629100030383038303830383038

Test 2: Latency 1->2

Code:

  uqxtn v0.4h, v0.4s
  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)191e3f4e51schedule 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)a9acbranch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
102043003722500006129547251010010010000100100005004277160030018300373003728264328745101002001000020010000300373003711102011009910010010000100000007101161129633100001003003830038300383003830038
102043003722500006129547251010010010000100100005004277160030018300373003728264328745101002001000020010000300373003711102011009910010010000100000007101161129633100001003003830038300383003830038
102043003722500006129547251010010010000100100005004277160030018300373003728264328745101002001000020010000300373003711102011009910010010000100000007101161129633100001003003830038300383003830038
1020430037225000128229547251010010010000100100005004277160030018300373003728264328745101002001000020010000300373003711102011009910010010000100000007101161129633100001003003830038300383003830038
102043003722500006129547251010010010000100100005004277160030018300373003728264328745101002001000020010000300373003711102011009910010010000100000007101161129633100001003003830038300383003830038
102043003722500006129547251010010010000100100005004277160030018300373003728264328745101002001000020010000300373003711102011009910010010000100000007101161129633100001003003830038300383003830038
102043003722400006129547251010010010000100100005004277160030018300373003728264328745101002001000020010000300373003711102011009910010010000100000007101161129633100001003003830038300383003830038
102043003722500006129547251010010010000100100005004277160030018300373003728264328745101002001000020010000300373003721102011009910010010000100000007101161129633100001003003830038300383003830038
102043003723200006129547251010010010000100100005004277160130018300373003728264328745101002001000020010000300373003711102011009910010010000100003007101161129633100001003003830038300383003830038
102043003722500006129547251010010010000100100005004277160030018300373003728264328745101002001000020010000300373003711102011009910010010000100000007101161129633100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)03mmu table walk instruction (07)l2 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)l1d tlb miss (a1)ld unit uop (a6)l1d cache writeback (a8)a9acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1002430037225000001290061295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
10024300372250000000061295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
100243003722500000300061295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
100243003722500000240061295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
10024300372250000000061295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
10024300372250000000061295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
100243003722500000120061295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
10024300372250000000061295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
10024300372240000000061295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
10024300372250000000061295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038

Test 3: throughput

Count: 8

Code:

  uqxtn v0.4h, v8.4s
  uqxtn v1.4h, v8.4s
  uqxtn v2.4h, v8.4s
  uqxtn v3.4h, v8.4s
  uqxtn v4.4h, v8.4s
  uqxtn v5.4h, v8.4s
  uqxtn v6.4h, v8.4s
  uqxtn v7.4h, v8.4s
  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)03181e1f3f51schedule 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 cache writeback (a8)acbranch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfmap dispatch bubble (d6)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
802042004915000043425801081008000810080020500640132120020200392019399776999080120200800322008003220039200391180201100991001008000010000011151185220036800001002004020040200402004020040
802042003915000015825801081008000810080020500640132020020200392003999776999080120200800322008003220039200391180201100991001008000010000011151181620036800001002004020040200402004020040
80204200391500003025801081008000810080020500640132120020200392003999776999080120200800322008003220039200391180201100991001008000010000011151181620157800001002004020040200402004020040
802042003915000883025801081008000810080020500640132120020200392003999776999080120200800322008003220039200391180201100991001008000010000011151181620036800001002004020040200402004020040
802042003915000030258010810080008100800205006401321200202003920039997711999080120200800322008003220039200391180201100991001008000010000011151181620036800001002004020040200402004020040
802042003915000030258010810080008100800205006401321200202003920039997769990801202008003220080032200392003911802011009910010080000100003111511828920036800001002004020040200402004020040
80204200391500003025801081008000810080020500640132120020203952003999986999080120200800322008003220039200391180201100991001008000010000311151181620036800001002004020040200402004020040
8020420039150027030258010810080008100800205006409441200202003920039997711100158023420080136200801372011320096218020110099100100800001000247511151181620036800001002004020040200402004020040
802042003915001503025801081008000810080020500640132120020200392003999776999080120200800322008003220039200391180201100991001008000010000011151181620036800001002004020040200402004020040
80204200391500603025801081008000810080020500640132120020200392003999776999080120200800322008003220039200391180201100991001008000010000011151181620036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

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)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)9fl1d cache writeback (a8)a9acbranch mispred nonspec (cb)cdcfd0d2l1i cache miss demand (d3)d5map dispatch bubble (d6)d9dbddfetch restart (de)e0eaeb? simd retires (ee)? int retires (ef)f5f6f7f8fd
8002420050150004025800101080000108000050640000612002020039200399996310019800102080000208000020039200391180021109101080000100000050200004160043200360080000102004020040200402004020040
8002420039150004025800101080000108000050640000512002020039200399996310019800102080000208000020039200391180021109101080000100000050200003160032200360080000102004020040200402004020040
8002420039150066125800101080000108000050640000612002020039200399996310019800102080000208000020039200391180021109101080000100000050200003160033200360080000102004020040200402004020040
800242003915001240258001010800001080000506400006120020200392003910005310019800102080000208000020039200391180021109101080000100000050200003160033200360080000102004020040200402004020040
80024200391500124025800101080000108000050640000612002020039200399996310019800102080000208000020039200391180021109101080000100000050200003160032200360080000102004020040200402004020040
80024200391500040258001010800001080000506400006120020200392003999963100198001020800002080000200392003911800211091010800001000000502000041600232003620080000102004020040200402004020040
8002420039150004025800101080000108000050640000612002020039200399996310019800102080000208000020039200391180021109101080000100000050200003160032200360080000102004020040200402004020040
8002420039150004025800101080000108000050640000612002020039200399996310019800102080000208000020039200391180021109101080000100000050200003160032200360080000102004020040200402004020040
80024200391500154025800101080000108000050640000712002020039200399996310019800102080000208000020039200391180021109101080000100000050200003160032200360080000102004020040200402004020040
80024200391500051525800101080000108000050640000712002020039200399996310019800102080000208000020039200391180021109101080000100000050200002160033200360080000102004020040200402004020040