Apple M1 Microarchitecture Research by Dougall Johnson

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

SQSUB (vector, 4S)

Test 1: uops

Code:

  sqsub v0.4s, v0.4s, v1.4s
  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)03080b191e3f4e51inst 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)a6a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
10043037220001512825482510001000100039831330183037303724153289510001000200030373037111001100000073316222627100030383038303830383038
100430372200006125482510001000100039831330183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303723000010325482510001000100039831330183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
100430372200006125482510001000100039831330183037303724153289510001000200030373037111001100000075216112630100030383038303830383038
100430372300006125482510001000100039831330183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
100430372300006125482510001000100039831330183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
100430372300006125482510001000100039831330183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
100430372300006125482510001000100039831330183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
100430372300106125482510001000100039831330183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
100430372300006125482510001000100039831330183037303724153289510001000200030373037111001100000075216112627100030383038303830383038

Test 2: Latency 1->2

Code:

  sqsub v0.4s, v0.4s, v1.4s
  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)0308181e3a3f4e51inst 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)9fa0a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020430037225000061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037224000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000027287101161129634100001003003830038300383003830038
10204300372240015061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830086300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)030408090b18191e1f3f4e51inst 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)9fa1a6a8a9acc2branch mispredict (cb)cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100243003722500000000124295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000000006404166529630010000103003830038300383003830038
10024300372250000040061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003751100211091010100001000000006405165529630010000103003830038300383003830038
10024300372250000000061295482510010101000010100005042773131300183003730225282873287671001020100002020000300373003711100211091010100001000000006404165429630010000103003830038300383003830038
1002430037225000000120103295482510010101000010100005042773131300183003730037282873287671001020100002020000300373022411100211091010100001000000006405336629630010000103003830038300383003830038
10024300372250000000061295482510010101000010100005042773131300183003730037282963287671001020100002020000300373003711100211091010100001000003006406165529630010000103003830038300383003830038
10024300372250000000061295302510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000006006405165529630010000103003830038300383003830038
10024300372250000000061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000108296006405165629630010000103003830038300383003830038
10024300372250000000061295482510010101000810100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000000006405166529630010000103003830038300383003830038
10024300372251001000061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000000006405165529630010000103003830038300383003830038
10024300372250000000061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000100006404165429630010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  sqsub v0.4s, v1.4s, v0.4s
  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)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)9fbranch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020430037225966129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225246129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
10204300372253816129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225396129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037224276129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129707100001003003830038300383003830038
1020430037225516129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722535110529548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
10204300372253846129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225246129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225306129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)03181e3f4e51inst 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)9fa8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100243003722508461295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372250061295482510010101000010100005042773131300183003730037282873287671001020100002020000300823003711100211091010100001000640216222963010000103003830038300383003830083
10024300372240361295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
1002430037225025861295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
1002430037225030361295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
1002430037225031861295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
1002430037225028261295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
1002430037225026461295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372250061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
1002430037225032761295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  sqsub v0.4s, v8.4s, v9.4s
  sqsub v1.4s, v8.4s, v9.4s
  sqsub v2.4s, v8.4s, v9.4s
  sqsub v3.4s, v8.4s, v9.4s
  sqsub v4.4s, v8.4s, v9.4s
  sqsub v5.4s, v8.4s, v9.4s
  sqsub v6.4s, v8.4s, v9.4s
  sqsub v7.4s, v8.4s, v9.4s
  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)5e60696d6edispatch 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)9fa6a8a9accfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
802042005815054412580100100800001008000050064000001200202003920039997303999780100200800002001600002003920039118020110099100100800001000025055110216112003617800001002004020040200402004020040
80204200391506412580100100800001008000050064000000200202003920039997303999780100200800992001602122009020039218020110099100100800001000000511011611200360800001002004020040200402004020040
802042003915033412580100100800001008000050064000001200202003920039997303999780100200800002001600002003920039118020110099100100800001000000511011611200360800001002004020040200402004020040
80204200391500412580100100800001008000050064000000200202003920039997303999780100200800002001600002003920039118020110099100100800001000000511011611200360800001002004020040200402004020040
80204200391509412580100100800001008000050064000000200202003920039997303999780100200800002001600002003920039118020110099100100800001000000511011611200360800001002004020040200402004020040
802042003915027412580100100800001008000050064000000200202003920039997303999780100200800002001600002003920039118020110099100100800001000000511011611200360800001002004020040200402004020040
802042003915054412580100100800001008000050064000000200202003920039997303999780100200800002001600002003920039118020110099100100800001000000511011611200360800001002004020040200402004020040
802042003915048412580100100800001008000050064000000200202003920039997303999780100200800002001600002003920039118020110099100100800001000000511011611200360800001002004020040200402004020040
802042003915057412580100100800001008000050064000000200202003920039997303999780100200800002001600002007720039118020110099100100800001000000511011611200360800001002004020040200402004020040
80204200391503412580100100800001008000050064000000200202003920039997303999780100200800002001600002003920039118020110099100100800001000000511011611200360800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)030407080a0b18191e1f3a3f51inst 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)5f60696d6edispatch 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)9fa0a1a6a8a9acc2cfd0d2d5d6d9dbddinst fetch restart (de)e0? int output thing (e9)eb? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242004815000000001140040258001010800001080000506400000020020200392003999963100198001020800002016000020039200391180021109101080000100000000502000151600148200360080000102004020040200402004020040
80024200391500000000150040258001010800001080000506400000020020200392003999963100198001020800002016000020039200391180021109101080000100000000502000171600177200360080000102004020040200402004020040
800242003915000000004440040258001010800001080000506400000020020200392003999963100198001020800002016000020039200391180021109101080000100000000502231171620148200360080000102004020040200402004020040
8002420039150000000000040258001010800001080000506400000020020200392008899963100198001020800002016000020039200391180021109101080000100000000502000171600176200360080000102004020040200402004020040
8002420039150000000000040258001010800001080000506400000020020200392003999963100198001020800002016000020039200391180021109101080000100000000502000171600178200360080000102004020040200402004020040
8002420039150000000000040258001010800001080000506400000020020200392003999963100198001020800002016000020039200391180021109101080000100000000502000171600617200360080000102004020040200402004020040
8002420039150000000000040258001010800001080000506400000020020200392003999963100198001020800002016000020039200391180021109101080000100000000502000171600178200360080000102004020040200402004020040
800242003915000000003600402580010108000010800005064000000200202003920039999631001980010208000020160000200392003911800211091010800001000000005020001716001717200360080000102004020040200402004020040
8002420039150000000060040258001010800001080000506400000020020200392003999963100198001020800002016000020039200391180021109101080000100000000502000171600146200360080000102004020040200402004020040
800242003915000000000004025800101080000108000050640000002002020039200399996310019800102080000201600002003920039118002110910108000010000000050200061601716200360080000102004020040200402004020040