Apple M1 Microarchitecture Research by Dougall Johnson

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

PMULL2 (8H)

Test 1: uops

Code:

  pmull2 v0.8h, v0.16b, v1.16b
  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)a8acc2cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
1004303723082254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303723061254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303723061254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
10043037230103254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303723061254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303723061254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303723061254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
10043037220103254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303723061254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303722061254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  pmull2 v0.8h, v0.16b, v1.16b
  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)031e3f4e51inst 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? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204300372250612954825101001001000010010000500427731313001803003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
102043003722515612954825101001001000010010000500427731313001803003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
102043003722512612954825101001001000010010000500427731313001803003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
1020430037224237612954825101001001000010010000500427731313001803003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
102043003722518612954825101001001000010010000500427731313001803003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
102043003722524612954825101001001000010010000500427731313001803003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
102043003722518612954825101001001000010010000500427731313001803003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
1020430037225241402954825101001001000010010000500427731313001803003730037282653287451010020010000200200003003730037111020110099100100100001001071011611296340100001003003830038300383003830038
10204300372253877262954825101001001000010010000500427731313001803003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
1020430037225187262954825101001001000010010000500427731313001803003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)030818191e3f4e51inst 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)9fa8acc5cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024300372250000612954825100101010000101000050427731313001830037300372830232876710010201000020200003003730037111002110910101000010000640316222963010000103003830038300383003830038
100243003722500030612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
100243003722500024612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
1002430037225000252612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
10024300372250000612953925100101010000101000050427731313001830037300372828732878610010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
1002430037224000255612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
10024300372250006612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
100243003722500078612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
100243003722500036612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
100243003722400010554312954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  pmull2 v0.8h, v1.16b, v0.16b
  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)030818191e1f3f4e51inst 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)9fa0a8a9acc2cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204300372250000061295482510100100100001001000050042773130300180300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773130300180300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383007930038
10204300372250000061295482510100100100001001000050042773130300180300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
10204300372250000089295482510100100100001001000050042773130300180300373003728265328745101002001000020020000300373003711102011009910010010000100200007101161129634100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773130300180300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
10204300372250000061295484510100100100001001000050042773130300180300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042777830300180300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773130300180300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
10204300372250000061295482510100103100001001000050042773130300180300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773130300180300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)03080b1e1f3f4e51inst 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)9fa1a6a8acc2cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024300372250000612954825100101010000101000050427731313001830037300372828703287671001020100002020000300373003711100211091010100001000000640416332963010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000000640316332963010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731313001830037300372828703287671001020100002020000300373003711100211091010100001000000640316332963010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731313001830037300372828703287671001020100002020000300373003711100211091010100001000000640316332963010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000000640316332963010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000000640316332970010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000000640316332963010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000000640316332963010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000000640316332963010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000000640316332969610000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  pmull2 v0.8h, v8.16b, v9.16b
  pmull2 v1.8h, v8.16b, v9.16b
  pmull2 v2.8h, v8.16b, v9.16b
  pmull2 v3.8h, v8.16b, v9.16b
  pmull2 v4.8h, v8.16b, v9.16b
  pmull2 v5.8h, v8.16b, v9.16b
  pmull2 v6.8h, v8.16b, v9.16b
  pmull2 v7.8h, v8.16b, v9.16b
  movi v8.16b, 9
  movi v9.16b, 10

(fused SUBS/B.cc loop)

100 unrolls and 100 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)6061696d6edispatch 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)9faccfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200601500412580100100800001008000050064000000200202003920039997303999780100200800002001600002003920039118020110099100100800001000511031611200360800001002004020090200502004020040
802042003915024412580100100800001008000050064000000200202003920039997303999780100200800002001600002003920039118020110099100100800001000511011611200360800001002004020040200402004020040
80204200391500412580100100800001008000050064000000200202003920039997303999780100200800002001600002003920039118020110099100100800001000511011611200360800001002004020040200402004020040
80204200391500412580100100800001008000050064000000200202003920039997303999780100200800002001600002003920039118020110099100100800001000511011611200360800001002004020040200402004020040
80204200391500412580100100800001008000050064000000200202003920039997303999780100200800002001600002003920039118020110099100100800001000511011611200360800001002004020040200402004020040
802042003915007062580100100800001008000050064000000200202003920039997303999780100200800002001600002003920039118020110099100100800001000511011611200360800001002004020040200402004020040
802042003915012412580100100800001008000050064000000200202003920039997303999780100200800002001600002003920039118020110099100100800001000511011611200360800001002004020040200402004020040
80204200391500412580100100800001008000050064000000200202003920039997303999780100200800002001600002003920039118020110099100100800001000511011611200360800001002004020040200402004020040
80204200391500412580100100800001008000050064000000200202003920039997303999780100200800002001600002003920039118020110099100100800001000511011611200360800001002004020040200402004020040
80204200391500412580100100800001008000050064000000200202003920039997303999780100200800002001600002003920039118020110099100100800001000511011611200360800001002004020040200402004020040

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)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)9fa8acc2c5cfd5d6ddinst fetch restart (de)e0ea? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200481500402580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010000050204164320036080000102004020040200402004020040
80024200391500402580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010000050203163420036080000102004020040200402004020040
80024200391506402580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010000050204164320036080000102004020040200402004020040
80024200391500402580010108000010800005064000012002020039200399996310019800102080140201600002003920039118002110910108000010000050203164320036080000102004020040200402004020040
80024200391500402580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010000050204164320036080000102004020040200402004020040
80024200391500402580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010000050203164420036080000102004020040200402004020040
800242003915002302580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010000050204164420036080000102004020040200402004020040
80024200391506402580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010000050203163420036080000102004020040200402004020040
80024200391500402580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010000050204163420036080000102004020040200402004020040
80024200391500402580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010000050204163420036080000102004020040200402004020040