Apple M1 Microarchitecture Research by Dougall Johnson

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

FSUB (vector, 2D)

Test 1: uops

Code:

  fsub v0.2d, v0.2d, v1.2d
  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)03181e3f4e51inst issue (52)~issue fp/simd (54)~dispatch fp/simd (57)huge thing fp/simd (5b)696b6d6edispatch 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
1004303723006125482510001000100039831330180303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303723006125482510001000100039831330180303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303722008225482510001000100039831330180303730372415328951000100020003037303711100110000073116112630100030383038303830383038
10043037230010325482510001000100039831330180303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303723006125482510001000100039831330180303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303723006125482510001000100039831330180303730372415328951000100020003037303711100110000373116112630100030383038303830383038
1004303723006125482510001000100039831330180303730372415628951000100020003037303711100110002373116112630100030383038303830383038
1004303722006125482510001000100039831330180303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303722006125482510001000100039831330180303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303723006125482510001000100039831330180303730372415328951000100020003037303711100110000073116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  fsub v0.2d, v0.2d, v1.2d
  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)030b191e3a3f4e51inst 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)9fa0a8acc5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020430037225000061295482510100100100001001000050042773131300183003730037282727287411010020010008200200163003730037111020110099100100100001000001117180160029647100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773131300183003730037282726287411010020010008200200163003730037111020110099100100100001000001117170160029647100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773130300183003730037282727287411010020010008200200163003730037111020110099100100100001000001117180160029646100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773131300183003730037282727287411010020010008200200163003730037111020110099100100100001000001117180160029647100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773130300183003730037282727287401010020010008200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038
10204300372250000105295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038
1020430037225000084295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000030007321161229634100001003003830038300383003830038
102043003722510120103295482510100100100001001059650042773130300183022830037282653287451073320010000200200003003730037111020110099100100100001000260007101161129634100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)0308181e3f4e51inst 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)9fa0a8accdcfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1002430037225000612954825100101010000101000050427731313001830037300372828703287671001020100002020000300373003711100211091010100001000006402162229630010000103003830038300383003830038
10024300372250002322954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000006402162229630010000103003830038300383003830038
1002430037224000612954825100101010000101000050427731313001830037300372828703287671001020100002020000300373003711100221091010100001001006402162229630010000103003830038300383003830038
1002430037225000612954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000006402162229630010000103003830038300383003830038
1002430037225000612954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000006402162229630010000103003830038300383003830038
1002430037225000612954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000006402162229630010000103003830038300383003830038
1002430037225000612954825100101010000101000050427731313001830037300372828703287671001020100002020000300373003711100211091010100001000006402322229630210000103003830038300383003830038
1002430037225000822954825100101010000101000050427731313001830037300372828703287671001020100002020000300373003711100211091010100001000006402162229630010000103003830038300383003830038
1002430037225000612954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000006402162229630010000103003830038300383003830038
10024300372250007262954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000006402162229630010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  fsub v0.2d, v1.2d, v0.2d
  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)9fa8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020430037225021429548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)03071e3f4e51inst 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)9fa1a8accfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1002430037225007629548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038
10024300372250156129548251001010100001010000504277313030018300373003728287328767100122010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038
1002430037224006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  fsub v0.2d, v8.2d, v9.2d
  fsub v1.2d, v8.2d, v9.2d
  fsub v2.2d, v8.2d, v9.2d
  fsub v3.2d, v8.2d, v9.2d
  fsub v4.2d, v8.2d, v9.2d
  fsub v5.2d, v8.2d, v9.2d
  fsub v6.2d, v8.2d, v9.2d
  fsub v7.2d, v8.2d, v9.2d
  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)030b3f51inst 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)9fa0a6a8a9acc2cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8020420057150041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051103161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051101161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051101161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051101161120036800001002004020040200402004020040
80204200391500798258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051101161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051101161120036800001002004020040200402004020040
80204200391500844258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051101161120036800001002004020040200402004020040
8020420039150083258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051101161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051101161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051101161120036800001002004020040200402004020040

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)9fa8accfd2icache miss (d3)d5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242003915008425800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100050200618169172003680000102004020040200402004020040
80024200391500646258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000502006171613172003680000102004020040200402004020040
8002420039150040258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000502006151616142003680000102004020040200402004020040
800242003915006325800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100050200771617142003680000102004020040200402004020040
8002420039150040258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000502007161618182003680000102004020040200402004020040
800242003915001300258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000502056141617132003680000102004020040200402004020040
8002420039150059325800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100050200681617142003680000102004020040200402004020040
8002420039150040258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000502006151610172003680000102004020040200402004020040
800242003915006225800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100050200891616132003680000102004020040200402004020040
80024200391500711258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000502008161614162003680000102004020040200402004020040