Apple M1 Microarchitecture Research by Dougall Johnson

Firestorm: Overview | Base Instructions | SIMD and FP Instructions
Icestorm:  Overview | Base Instructions | SIMD and FP Instructions

SQRSHRUN (H)

Test 1: uops

Code:

  sqrshrun b0, h0, #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 (01)cycle (02)031e3f4e51inst issue (52)~issue fp/simd (54)~dispatch fp/simd (57)huge thing fp/simd (5b)60696d6edispatch stall (70)scheduler rewind (75)scheduler stall (76)~dispatch op (78)~map op fp/simd (7e)~map lookup fp/simd (81)8283pipeline redirect (84)85inst all (8c)inst neon or fp (9a)a8a9accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
1004303722082254725100010001000398160030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
1004303722061254725100010001000398160030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
1004303723061254725100010001000398160130183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
1004303722061254725100010001000398160130183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
1004303723061254725100010001000398160030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
1004303722061254725100010001000398160030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
1004303723061254725100010001000398160130183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
1004303722061254725100010001000398160130183037303724143289510001000100030843037111001100000073116112701100030383038303830383038
1004303723061254725100010001000398160030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
1004303723061254725100010001000398160030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038

Test 2: Latency 1->2

Code:

  sqrshrun b0, h0, #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 (01)cycle (02)03090b18191e1f3a3f4e51inst issue (52)~issue int (53)~issue fp/simd (54)~dispatch int (56)~dispatch fp/simd (57)huge thing int (59)huge thing fp/simd (5b)60696d6edispatch stall (70)scheduler rewind (75)scheduler stall (76)~dispatch op (78)~map op int (7c)~map op fp/simd (7e)~map lookup int (7f)~map lookup fp/simd (81)8283pipeline redirect (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst b.cc (94)inst integer (97)inst neon or fp (9a)9fa0a1a6a7a8a9acc2cdcfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102043003722500009004092954725101001001000010010000500427716003001830037300372826432874510100200100002001000030037300371110201100991001001000010000000000071011611296330100001003003830038300383003830038
10204300372250000000612954725101001001000010010000500427716003001830037300372826432874510100200100002001000030037300371110201100991001001000010000000000071011611296330100001003003830038300383003830038
10204300372250000000612954725101001001000010010000500427716003001830037300372826432874510100200100002001000030037300371110201100991001001000010000000000071011611296330100001003003830038300383003830038
10204300372250000000612954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010000000000071011611296330100001003003830038300383003830038
10204300372250000000612954725101001001000010010000500427716003001830037300372826432874510100200100002001000030037300371110201100991001001000010000000030071011611296330100001003003830038300383003830038
10204300372250000000612954725101001001000010010000500427716003001830037300372826432874510100200100002001000030037300371110201100991001001000010000000000071011611296330100001003003830038300383003830038
10204300372250000000612954725101001001000010010000500427716003001830037300372826432874510100200100002001000030037300371110201100991001001000010000000000071011611296330100001003003830038300383003830038
102043003722500002400612954725101001001000010010000500427716003001830037300372826432874510100200100002001000030037300371110201100991001001000010000000000071011611296330100001003003830038300383003830038
102043003722500002700612954725101001001000010010000500427716003001830037300372826432874510100200100002001000030037300371110201100991001001000010000000000071011611296330100001003003830038300383003830038
102043003722500003000612954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010000000000071011611296330100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)03090b191e1f3f4e51inst issue (52)~issue int (53)~issue fp/simd (54)~dispatch int (56)~dispatch fp/simd (57)huge thing int (59)huge thing fp/simd (5b)6061696d6edispatch stall (70)scheduler rewind (75)scheduler stall (76)~dispatch op (78)~map op int (7c)~map op fp/simd (7e)~map lookup int (7f)~map lookup fp/simd (81)8283pipeline redirect (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst b.cc (94)inst integer (97)inst neon or fp (9a)9fa6a8a9acc2cfd0d5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100243003722500042061295472510018121000010100005042771601330018300373003728286328767100102010000201000030037300371110021109101010000100000064034162229629010000103003830038300383003830038
100243003722500042061295472510010101000010100005042771601330018300373003728286328767100102010000201000030037300371110021109101010000100000064032162229629010000103003830038300383003830038
100243003722500045061295472510010101000010100005042771601330018300373003728286328767100102010000201000030037300371110021109101010000100000064032162229629010000103003830038300383003830038
100243003722500036061295472510010101000010100005042771601330018300373003728286328767100102010000201000030037300371110021109101010000100000064034242229629010000103003830038300383003830038
10024300372250000061295472510010101000010100005042771601330018300373003728286328767100102010000201000030037300371110021109101010000100000064032162229629010000103003830038300383003830038
100243003722500057061295472510010101000010100005042771601330018300373003728286328767100102010000201000030037300371110021109101010000100000064032162229629010000103003830038300383003830038
100243003722500024061295112510010101000010100005042771601330018300373003728286328767100102010000201000030037300371110021109101010000100000064032162229629010000103003830038300383003830038
100243003722500051061295472510010101000010100005042771601330018300373003728286328767100102010000201000030037300371110021109101010000100000264032162229629010000103003830038300383003830038
100243003722400072061295472510010101000010100005042771601330018300373003728286328767100102010000201000030037300371110021109101010000100000064032162229629010000103003830133300383003830038
10024300372250006061295472510010101000010100005042771601330018300373003728286328767100102010000201000030037300375110021109101010000100000064032162229629010000103008630038300383003830038

Test 3: throughput

Count: 8

Code:

  sqrshrun b0, h8, #3
  sqrshrun b1, h8, #3
  sqrshrun b2, h8, #3
  sqrshrun b3, h8, #3
  sqrshrun b4, h8, #3
  sqrshrun b5, h8, #3
  sqrshrun b6, h8, #3
  sqrshrun b7, h8, #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 (01)cycle (02)03191e1f3f51inst issue (52)~issue int (53)~issue fp/simd (54)~dispatch int (56)~dispatch fp/simd (57)huge thing int (59)huge thing fp/simd (5b)60696d6edispatch stall (70)scheduler rewind (75)scheduler stall (76)~dispatch op (78)~map op int (7c)~map op fp/simd (7e)~map lookup int (7f)~map lookup fp/simd (81)8283pipeline redirect (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst b.cc (94)inst integer (97)inst neon or fp (9a)9fa6a8acc5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
802042005915001203025801081008000810080020500640132020020200392003999776999080120200800322008003220039200391180201100991001008000010000011151181162120036800001002004020040200402004020040
802042003915030053258010810080008100800205006410400200202003920039997769990801202008003220080032200392003911802011009910010080000100001211151181161120036800001002004020040200402004020040
802042003915000030258010810080008100800205006401320200202003920039997769990801202008003220080032200392003911802011009910010080000100002411151181161120036800001002004020040200402004020040
802042003915000030258010810080008100800205006401320200202003920039997769990801202008003220080032200392003911802011009910010080000100236311151181161120036800001002004020040200402004020040
802042003915000020125801081008000810080020500640132020020200392003999776999080120200800322008003220039200391180201100991001008000010001311151181161120036800001002004020040200402004020040
80204200391500003025801081008000810080020500640132020020200392003999776999080120200800322008003220039200391180201100991001008000010000911151181161120036800001002004020040200402004020040
802042003915019883025801081008000810080020500640132120020200392003999776999080120200800322008003220039200391180201100991001008000010000011151181161120036800001002004020040200402004020040
80204200391500003025801081008000810080020500640132020020200392003999776999080120200800322008003220039200391180201100991001008000010000911151181161120036800001002004020040200402004020040
802042003915000030258010810080008100800205006401321200202003920039997769990801202008003220080032200392003911802011009910010080000100006611151181161120036800001002004020040200402004020040
802042003915000030258010810080008100800205006401320200202003920039997769990801202008003220080032200392003911802011009910010080000100045011151181161120036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)031e3f51inst issue (52)~issue int (53)~issue fp/simd (54)~dispatch int (56)~dispatch fp/simd (57)huge thing int (59)huge thing fp/simd (5b)696d6edispatch stall (70)scheduler rewind (75)scheduler stall (76)~dispatch op (78)~map op int (7c)~map op fp/simd (7e)~map lookup int (7f)~map lookup fp/simd (81)8283pipeline redirect (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst b.cc (94)inst integer (97)inst neon or fp (9a)9fa1cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200391500632580010108000010800005064000020020201432003999963100198001020800002080000200392003911800211091010800001005020716862003680000102004020040200402004020040
80024200391500402580010108000010800005064000020020200392003999963100198001020800002080000200392003911800211091010800001005020716672003680000102004020040200402004020040
80024200391500402580010108000010800005064000020020200392003999963100198001020800002080000200392003911800211091010800001005020716792003680000102004020040200402004020040
80024200391500402580010108000010800005064000020020200392003999963100198001020800002080000200392003911800211091010800001005020616972003680000102004020040200402004020040
80024200391500402580010108000010800005064000020020200392003999963100198001020800002080000200392003911800211091010800001005020716962003680000102004020040200402004020040
80024200391500402580010108000010800005064000020020200392003999963100198001020800002080000200392003911800211091010800001005020716872003680000102004020040200402004020040
80024200391500402580010108000010800005064000020020200392003999963100198001020800002080000200392003911800211091010800001005020616992003680000102004020040200402004020040
80024200391500402580010108000010800005064000020020200392003999963100198001020800002080000200392003911800211091010800001005020716892003680000102004020040200402004020040
80024200391500402580010108000010800005064000020021200392003999963100198001020800002080000200392003911800211091010800001005020616992003680000102004020040200402004020040
80024200391503402580010108000010800005064000020020200392003999963100198001020800002080000200392003911800211091010800001005020716762003680000102004020040200402004020040