Apple M1 Microarchitecture Research by Dougall Johnson

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

UQXTN (H)

Test 1: uops

Code:

  uqxtn b0, h0
  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)accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
1004303723061254725100010001000398160301830373037241432895100010001000303730371110011000073216222629100030383038303830383038
1004303722661254725100010001000398160301830373037241432895100010001000303730371110011000073216222629100030383038303830383038
1004303722061254725100010001000398160301830373037241432895100010001000303730371110011000073216222629100030383038303830383038
1004303723061254725100010001000398160301830373037241432895100010001000303730371110011000073216222629100030383038303830383038
1004303723061254725100010001000398160301830373037241432895100010001000303730371110011000073216222629100030383038303830383038
1004303723061254725100010001000398160301830373037241432895100010001000303730371110011000073216222629100030383038303830383038
1004303723061254725100010001000398160301830373037241432895100010001000303730371110011000073216222629100030383038303830383038
1004303722061254725100010001000398160301830373037241432895100010001000303730371110011000073216222629100030383038303830383038
1004303723061254725100010001000398160301830373037241432895100010001000303730371110011000073216222629100030383038303830383038
1004303722061254725100010001000398160301830373037241432895100010001000303730371110011000073216222629100030383038303830383038

Test 2: Latency 1->2

Code:

  uqxtn b0, h0
  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)030b18191e1f3f4e51inst 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)9fa1a6a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102043003722500000612954725101001001000010010000500427716003001830037300372826432874510100200100002001000030037300371110201100991001001000010000000071011611296330100001003003830038300383003830038
1020430037225000005692954725101001001000010010000500427716013001830037300372826432876710100200100002001000030037300371110201100991001001000010000000071011611296330100001003003830038300383003830038
102043003722500000612954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010000000071011611296330100001003003830038300383003830038
102043003722500000612954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010000000071011611296330100001003003830038300383003830038
102043003722500000612954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010000000071011611296330100001003003830038300383003830038
102043003722400060612954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300372110201100991001001000010000000071011611296330100001003003830038300383003830038
102043003722500000612954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010000000071011611296330100001003003830038300383003830038
102043003722500000822954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010000000071011611296330100001003003830038300383003830038
102043003722500000612954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010000000071011611296330100001003003830038300383003830038
102043003722500000612954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010000000071011611296330100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)030708090b18191e1f3a3f4e51inst 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)9fa0a6a7a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100243003722400000000061295472510010101000010100005042771600300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
1002430037224000000000168295472510010101000010100005042771600300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
100243003722500000000061295472510010101000010100005042771600300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
100243003722500000000061295472510010101000010100005042771600300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
100243003722500000000061295472510010101000010100005042771600300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
100243003722500000000061295472510010101000010100005042771600300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629210000103003830038300383003830038
100243003722500000060082295472510010101000010100005542771600300183003730037282863287671001020100002010329300373003711100211091010100001000000007252162229629010000103003830038300383003830038
100243003722500000000145922948415310069131006412110508242825680300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
1002430037224000052801528039852946615210077161007212111597742879760302703041030463283173628933113462211308261130530413303699110021109101010000102000022190081051064429960310000103055730560305103052130550
10024305112290111101013325280779295202510092221008014116236642906800300223003730037282863287671001020100002010000300373003711100211091010100001000000006403402229629010000103003830038300383003830038

Test 3: throughput

Count: 8

Code:

  uqxtn b0, h8
  uqxtn b1, h8
  uqxtn b2, h8
  uqxtn b3, h8
  uqxtn b4, h8
  uqxtn b5, h8
  uqxtn b6, h8
  uqxtn b7, h8
  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)0307081e3f51inst 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)9fa6a8a9acc5branch mispredict (cb)cdcfd6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8020420059152110267258010810080212101801305006409961200682003920039998612999080232200800322008003220039200391180201100991001008000010030231115118160020036800001002004020040200402004020040
802042003915000030258010810080008100800205006401321200202003920039997769990801202008003220080032200392003911802011009910010080000100000661115118160020036800001002004020040200402004020040
80204200391500003025801081008000810080020500640132120020200392003999776999080120200800322008003220039200391180201100991001008000010000001115118160020036800001002004020040200402004020040
80204200391500003025801081008000810080020500640132120020200392003999776999080120200800322008003220039200391180201100991001008000010000331115118160020036800001002004020040200402004020040
802042003915000022025801081008000810080020500640132120020200392003999776999080120200800322008003220039200391180201100991001008000010000091115118160020036800001002004020040200402004020040
80204200391500003025801081008000810080020500640132120020200392003999776999080120200800322008003220039200391180201100991001008000010000031115118160020036800001002004020040200402004020040
80204200391500005325801081008000810080020500640132120020200392003999776999080120200800322008003220039200391180201100991001008000010000031115118160020036800001002004020040200402004020040
80204200391500003025801081008000810280020500640132020020200392009999776999080120200800322008003220039200911180201100991001008000010002061115136411020036800001002015320142200402004020040
80204200391500003025801081008000810080020500640132120020200392003999776999080120200800322008003220039200391180201100991001008000010000061115118160020036800001002004020040200402004020040
80204200391500003025801081008000810080020500640132120020200392003999776999080120200800322008003220039200391180201100991001008000010001061115118160020036800001002004020040200402004020040

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)60696b6d6edispatch 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)9fa8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200501500402580010108000010800005064000002002002003920039999631001980010208000020800002003920039118002110910108000010005020121612122003680000102004020040200402004020040
80024200391500402580010108000010800005064000002002032003920039999631001980010208000020800002003920039118002110910108000010005020121612122003680000102004020040200402004020040
80024200391500402580010108000010800005064000012002002003920039999631001980010208000020800002003920039118002110910108000010035020131612122003680000102004020040200402004020040
80024200391500402580010108000010800005064000002002002003920039999631001980010208000020800002003920039118002110910108000010005020121611122003680000102004020040200402004020040
80024200391500402580010108000010800005064000012002002003920039999631001980010208000020800002003920039118002110910108000010005020121611132003680000102004020040200402004020040
80024200391500402580010108000010800005064000012002002003920039999631001980010208000020800002003920039118002110910108000010105020111611112003680000102004020090200402004020040
80024200391500402580010108000010800005064000012002002003920039999631001980010208000020800002003920039118002110910108000010195020111612132003680000102004020040200402004020040
80024200391500402580010108000010800005064000002002002003920039999631001980010208000020800002003920039118002110910108000010005020111611112003680000102004020040200402004020040
800242003915002302580010108029310800005064000012002002003920039999631001980010208000020800002003920039118002110910108000010365020121613122003680000102004020040200402004020040
80024200391500402580010108000010800005064000012002002003920039999631001980010208000020800002003920039118002110910108000010005020121611112003680000102004020040200402004020040