Apple M1 Microarchitecture Research by Dougall Johnson

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

FADDP (vector, 4S)

Test 1: uops

Code:

  faddp 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)031e1f3f4e51inst 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
10043037230010325482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303722006125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303723006125482510001000100039831313018303730372415328951000100020003037303711100110004073116112630100030383038303830383038
1004303723006125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303722606125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303722006125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303722006125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303723006125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303723006125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303723006125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  faddp 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)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)9fa8accdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020430037225061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007102161129634100001003003830132300383003830038
1020430037225061295482510100100100001001000061842773130300183003730037282653287451010020010000200200003003730037111020110099100100100001004007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003008530038300383003830038
1020430037225061295482510100100100001001000052642773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)030708090b18191e1f3f4e51inst 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)9fa0a1a6a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1002430037225000000006129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000000006402162229630010000103003830038300383003830038
10024300372250000000072629548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000000006402162229630010000103003830038300383003830038
1002430037225000000006129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000000006402162229630010000103003830038300383003830038
1002430037225000000006129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000000006402162229630010000103003830038300383008530038
1002430037225000000006129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000000006402162229630010000103003830038300383003830038
1002430037225000000006129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000000006402162229630010000103003830038300383003830038
1002430037225000000006129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000000006402162229630010000103003830038300383003830038
1002430037225000000006129548251001010100001010149504277313300183003730037282873287671001020100002020000300373003711100211091010100001000000006402162229630010000103003830038300383003830038
1002430073227011076804616330329485141100661110056141029877428545530270303193031828315282889510908201116720219523036430366811002110910101000010203121929507873722429880310000103036930370303673036930407
1002430367228010167795264493429485139100721510064131044770428681230306303683008528316322887811054241100022219643037030368711002110910101000010022121948807652563329881110000103036730370304083013330367

Test 3: Latency 1->3

Code:

  faddp 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)0308090b18191e1f3a3f4e51inst 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)9fa0a1a6a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020430037225000000006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071011611296340100001003003830038300383003830038
1020430037225000000006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071011611296340100001003003830038300383003830038
1020430037225000000006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071011611296340100001003003830038300383003830038
1020430037225000000006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071011611296340100001003003830038300383003830038
1020430037225000000006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071011611296340100001003003830038300383003830038
1020530037225000000006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071011611296340100001003003830038300383003830038
1020430037224000000006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071011611296340100001003003830038300383003830038
1020430037225000000006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071011611296340100001003003830038300383003830038
1020430037224000000006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071011611296340100001003003830038300383003830038
1020430037224000000006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071011611296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)03090e191e3f4e51inst 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)9fa8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024300372250100612954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000640316222963010000103003830038300383003830038
100243003722500008332954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731313001830037300372828703287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001003640216222963010000103003830038300383003830038
10024300372250000612954825100101010000101000050427867003001830037300372828703287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  faddp v0.4s, v8.4s, v9.4s
  faddp v1.4s, v8.4s, v9.4s
  faddp v2.4s, v8.4s, v9.4s
  faddp v3.4s, v8.4s, v9.4s
  faddp v4.4s, v8.4s, v9.4s
  faddp v5.4s, v8.4s, v9.4s
  faddp v6.4s, v8.4s, v9.4s
  faddp 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)03080b3f51inst 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)9fa9c5branch mispredict (cb)cdcfd6inst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200581500030258010810080008100800205006401320200200200392003999776999080120200800322001600642003920039118020110099100100800001000111511816020036800001002004020040200402004020040
80204200391500030258010810080008100800205006401321200200200392016799876999080120200800322001600642003920039118020110099100100800001000111511816020036800001002004020040200402004020040
80204200391500030258010810080008100800205006401320200200200392003999776999080120200800322001600642003920039118020110099100100800001000111511816020036800001002004020040200402004020040
80204200391500030258010810080008100800205006401320200200200392003999776999080120200800322001600642003920039118020110099100100800001000111511816020036800001002004020040200402004020040
802042003915000505258010810080008100800205006401321200200200392003999776999080120200800322001600642003920039118020110099100100800001000111511816020036800001002004020040200402004020040
80204200391500030258010810080008100800205006401320200203200392003999776999080120200800322001600642003920039118020110099100100800001000111511816020036800001002004020040200402004020040
80204200391500030258010810080008100800205006401320200200200392003999776999080120200800322001600642003920039118020110099100100800001000111511816020036800001002004020040200402004020040
80204200391500030258010810080008100800205006401320200200200392003999776999080120200800322001600642003920039118020110099100100800001000111511816020036800001002004020040200402004020040
80204200391500030258010810080008100800205006401320200200200392003999776999080120200800322001600642003920039118020110099100100800001000111511816020036800001002004020040200402004020040
80204200391500030258010810080008100800205006401321200200200392003999776999080120200800322001600642003920039118020110099100100800001000111511816020036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)0308091e3f51inst 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? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200481500008225800101080000108000050640000120063200392003999963100198001020800002016000020039200391180021109101080000100050203163220036080000102004020040200402004020040
8002420039150000272448001010800001080107506400001200202003920039999631001980010208000020160000200392003911800211091010800001011250202163320036080000102004020040200402009220040
80024200391500004025800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100050203163320036080000102004020040200402009020040
80024200391500004025800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000101350203163320036080000102004020040200402004020040
80024200391500004025800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100050203163320036080000102004020040200402004020040
800242003915000013525800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100050203163320036080000102004020040200402004020040
80024200391500004025800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100050203162320036080000102004020040200402004020040
80024200391500004025800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100950202163320036080000102004020040200402004020040
80024200391500004025800101080000108000050640000120070200392003999963100198001020800002016000020039200391180021109101080000100050203163320036080000102004020040200402004020040
800242003915000124025800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000101050202163320036080000102004020040200402009120040