Apple M1 Microarchitecture Research by Dougall Johnson

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

SQXTUN (D)

Test 1: uops

Code:

  sqxtun s0, d0
  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)696d6edispatch 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)a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
10043037230612547251000100010003981603018303730372414328951000100010003037303711100110000073216112629100030383038303830383038
10043037220612547251000100010003981603018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372312612547251000100010003981603018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
10043037230612547251000100010003981603018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372301032547251000100010003981603018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372301242547251000100010003981603018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372263612547251000100010003981603018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
10043037230612547251000100010003981603018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
10043037230612547251000100010003981603018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
10043037220612547251000100010003981603018303730372414328951000100010003037303711100110000073116112629100030383038303830383038

Test 2: Latency 1->2

Code:

  sqxtun s0, d0
  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)0318191e1f3f4e51inst 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)9fa8cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102043003722500630612954725101001001000010010000500427716013005430037300372826432874510100200100002001000030037300371110201100991001001000010007101161129633100001003003830038300383003830038
10204300372250000612954725101001001000010010000500427716003001830037300372826432874510100200100002001000030037300371110201100991001001000010007101161129633100001003003830038300383003830038
10204300372250000612954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010007101161129633100001003003830038300383003830038
10204300372250000612954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010007101161129704100001003003830038300383003830038
10204300372250000612954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010007101161129633100001003003830038300383003830038
1020430037225041888612954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010007101161129633100001003003830038300383003830038
10204300372250000612954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010007101161129633100001003003830038300383003830038
10204300372250000612954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010007101161129633100001003003830038300383003830038
10204300372250000612954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010007101161129633100001003003830038300383003830038
10204300372250000612954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010007101161129633100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)030b18191e1f3a3f4e51inst 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)9fa0a1a6a7a8a9acbccfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024300372250006300612954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010000000006402162229629010000103003830038300383003830038
1002430037225000000612954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010000000006402162229629010000103003830038300383003830038
1002430037225000000612954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010020000007653743229883410000103037130368303213037230367
100243036722816710861760461729484154100711310048111105087428798503027030319303682831331289121106620113062411151304033036981100211091010100001020001016493083341053229917210000103003830038300383008630038
10024300372250000012037295111361006914100271510750824285272030198303183022528306222882210766201049020104923032330367711002110910101000010200100842306402412229629210000103021730274301803003830038
1002430037282012121056704140412945719010099151006416112007642893280300183055930603282865328951106142411238241148430553303695110021109101010000100200021685586402162229629010000103003830038300383003830038
1002430037225000000612954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010000000006402162229629010000103003830038300383003830038
1002430037225000000612954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010000000006402162229629010000103003830038300383003830038
1002430037225000000612954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010000000006402162229629010000103003830038300383003830038
100243003722500037200612954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010000000006402162229629010000103003830038300383003830038

Test 3: throughput

Count: 8

Code:

  sqxtun s0, d8
  sqxtun s1, d8
  sqxtun s2, d8
  sqxtun s3, d8
  sqxtun s4, d8
  sqxtun s5, d8
  sqxtun s6, d8
  sqxtun s7, d8
  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 (01)cycle (02)03080b18191e1f3f51inst 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)9fa0a1a8a9acc2c5branch mispredict (cb)cdcfd5d6dde0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200581500000300302580108100800081008002050064013220020200392003999776999080120200800322008003220039200391180201100991001008000010000000011151180160200360800001002004020040200402004020040
8020420039150000000302580108100800081008002050064013220020200392003999886999080120200800322008003220039200391180201100991001008000010000000011151180160200360800001002004020040200402004020040
8020420039150000000302580108100800081008002050064013220020200392003999776999080120200800322008003220039200391180201100991001008000010000000011151180160200360800001002004020040200402004020040
802042003915000003600302580108100800081008002050064013220020200392003999776999080120200800322008003220039200391180201100991001008000010000000011151180160200360800001002004020040200402004020040
8020420039150000000302580108100800081008002050064013220020200392003999776999080120200800322008003220039200391180201100991001008000010000000011151180160200360800001002004020040200402004020040
8020420039150000000302580108100800081008002050064013220020200392003999776999080120200800322008003220039200391180201100991001008000010000000011151180160200360800001002004020040200402004020040
8020420039150000000302580108100800081008002050064013220020200392003999776999080120200800322008003220039200391180201100991001008000010000000011151180160200360800001002004020040200402004020040
8020420039150004100302580108100800081008002050064013220020200392003999776999080120200800322008003220039200391180201100991001008000010000000011151180160200360800001002004020040200402004020040
8020420039150000000302580108100800081008002050064013220020200392003999776999080120200800322008003220039200391180201100991001008000010000000011151180160200360800001002004020040200402004020040
80204200391500000006952580108100800081008002050064013220020200392003999776999080120200800322008003220039200391180201100991001008000010000000011151180160200360800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03181e1f3f51inst 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)9fa8cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242005015002404025800101080000108000050640000020020200392003999963100198001020800002080000200392003911800211091010800001005020116112003680000102004020040200402004020040
800242003915000040258001010800001080000506400000200202011420039100053100198001020800002080000200392003911800211091010800001005020116112003680000102004020040200402004020040
80024200391500004025800101080000108000050640000120020200392003999963100198001020800002080000200392003911800211091010800001005020116112003680000102004020040200402004020040
80024200391500004025800101080000108000050640000020020200392003999963100198001020800002080000200392003911800211091010800001005020116112003680000102004020040200402004020040
80024200391500004025800101080000108000050640000020020200392003999963100198001020800002080000200392003911800211091010800001005020116112003680000102004020040200402004020040
80024200391500004025800101080000108000050640000020020200392003999963100198001020800002080000200392003911800211091010800001005020116112003680000102004020040200402004020040
80024200391500004025800101080000108000050640000120020200392003999963100198001020800002080000200392003911800211091010800001005020116112003680000102004020040200402004020040
80024200391500004025800101080000108000050640000020020200392003999963100198001020800002080000200392003911800211091010800001005020116112003680000102004020040200402004020040
800242003915001804025800101080000108000050640000020020200392003999963100198001020800002080000200392003911800211091010800001005020116112003680000102004020040200402004020040
80024200391500004025800101080000108000050640000020020200392003999963100198001020800002080000200392003911800211091010800001005020116112003680000102004020040200402004020040