Apple M1 Microarchitecture Research by Dougall Johnson

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

UQSHRN (H)

Test 1: uops

Code:

  uqshrn 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)a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
100430372206125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
1004303722061254725100010001000398160130183037303724143289510001000100030373037111001100001273116112629100030383038303830383038
100430372206125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
1004303723061254725100010001000398160030183037303724143289510001000100030373037111001100001273116112629100030383038303830383038
100430372306125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372306125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372306125472510001005100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372206125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372206125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372306125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038

Test 2: Latency 1->2

Code:

  uqshrn 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)030b18191e3f4e5051inst 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)9fa8accfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102043003722500005362954702510100100100001001000050042771603001830037300372826432874510100200100002001000030037300371110201100991001001000010021871471011611296330100001003003830038300383003830038
102043003722500006312954702510100100100001001000050042771603001830037300372826432874510100200100002001000030037300371110201100991001001000010029371011611296330100001003003830038300383003830038
10204300372250000726295470251010010010000100100005004277160300183003730037282643287451010020010000200100003003730037111020110099100100100001007371011611296330100001003003830038300383003830038
102043003722500007262954702510100100100001001000050042771603001830037300372826432874510100200100002001000030037300371110201100991001001000010026371011611296330100001003003830038300383003830038
102043003722500006129547025101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009910010010000100010571011611296330100001003003830038300383003830038
1020430037225000216129547025101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009910010010000100261125371011611296330100001003003830038300383003830038
10204300372240000612954702510100100100001001000050042771603001830037300372826432874510100200100002001000030037300371110201100991001001000010031371011611296330100001003003830038300383003830038
10204300372250000612954702510100100100001001000050042771603001830037300372826432874510100200100002001000030037300371110201100991001001000010026371011611296330100001003003830038300383003830038
10204300372250000612954702510100100100001001000050042771603001830037300372826432874510100200100002001000030037300371110201100991001001000010027371011611296330100001003003830038300383003830038
10204300372250000612954702510100100100001001000050042771603001830037300372826432874510100200100002001000030037300371110201100991001001000010043371011611296330100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)03080b18191e1f3a3f4e51inst 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)72scheduler 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)9fa0a1a6a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024300372250000000612954725100101010000101000050427716003001830037300372828603287671001020100002010000300373003711100211091010100001000010006402162229629010000103003830038300383003830038
10024300372250000000612954725100101010000101000050427716003001830037300372828603287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
10024300372250000000612954725100101010000101000050427716013001830037300372828603287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
10024300372250000000612954725100101010000101000050427716003001830037300372828603287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
10024300372250000000612954725100101010000101000050427716003001830037300372828603287671001020100002010000300373003711100211091010100001000000006402162229629010000103008630038300383003830038
10024300372250000000612954725100101010000101000050427716003001830037300372828603287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
100243003722500000006129547251001010100001010000504277160030018300373003728286732876710010201000020100003003730037111002110910101000010000003306402162229629010000103003830038300383003830038
10024300372250000000612954725100101010000101000050427716003001830037300372828603287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
100243003722500000001242954725100101010000101000050427716003001830037300372828603287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
10024300372250000000612954725100101010000101000050427716003001830037300372828603287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038

Test 3: throughput

Count: 8

Code:

  uqshrn b0, h8, #3
  uqshrn b1, h8, #3
  uqshrn b2, h8, #3
  uqshrn b3, h8, #3
  uqshrn b4, h8, #3
  uqshrn b5, h8, #3
  uqshrn b6, h8, #3
  uqshrn 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): 0.2505

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)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)9fa0a1a6a8a9acc2c5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
802042003915000000050525801081008000810080020500640132020020200392003999776999080120200800322008003220039200391180201100991001008000010000053090111511811600200360800001002004020040200402004020040
80204200391500000003025801081008000810080020500640132120020200392003999776999080120200800322008003220039200391180201100991001008000010000000900111511801600200360800001002004020040200402004020040
80204200391500000004025801081008000810080020500640132120020200392003999776999080120200800322008003220039200391180201100991001008000010000010120111511801600200360800001002004020040200402004020040
8020420039150001030302580108100800081008002050064013212002020039200399977699908012020080032200800322003920039118020110099100100800001000004501740111511801600200360800001002004020040200402004020040
8020420039150000000302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000000000111511801600200360800001002004020040200402004020040
8020420039150000000302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000000030111511801600200360800001002004020040200402004020040
8020420039150000000302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000000000111511801600200360800001002004020040200402004020040
8020420039150000000302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000005204780111511801600200360800001002004020040200402004020040
8020420039150000000302580108100800081008002050064013212002020039200399977699908012020080032200800322003920039118020110099100100800001000001000111511801600200360800001002004020040200402004020040
80204200391500000003025801081008000810080020500640132020020200392003999776999080120200800322008003220039200391180201100991001008000010000047000111511801600200360800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03081e3f51inst 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)9fa6a8a9accfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200511500040258001010800001080000506400001200202003920039999631001980010208000020800002003920039118002110910108000010020050202161120036080000102004020040200402004020040
80024200391500040258001010800001080000506400001200202003920039999631001980010208000020800002003920039118002110910108000010010650201161120036080000102011420040200402004020040
80024200391500040258001010800001080000506400001200202003920039999631001980010208000020800002003920039118002110910108000010010050201161120036080000102004020040200402004020040
80024200391500040258001010800001080000506400001200202003920039999631001980010208000020800002003920039118002110910108000010000050201161120036080000102004020040200402004020040
80024200391500040258001010800001080000506400001200692003920039999631001980010208000020800002003920039118002110910108000010000050201161120036080000102004020040200402004020040
80024200391500040258001010800001080000506400001200202003920039999631001980010208000020800002003920089118002110910108000010000050201161120036080000102004020040200402004020040
80024200391500040258001010800001080000506400001200202003920039999631001980010208000020800002003920039118002110910108000010090188350201161120036080000102004020040200402004020040
800242003915000705258001010800001080000506400001200202003920039999631001980010208000020800002003920039118002110910108000010000050201161120036080000102004020040200402004020040
80024200391500040258001010800001080000506400001200202003920039999631001980010208000020800002003920039118002110910108000010000050201161120036080000102004020040200402004020040
800242003915000402580010108000010800005064000012002020039200399996310019800102080000208000020039200391180021109101080000100250050201161120036080000102004020040200402004020040