Apple M1 Microarchitecture Research by Dougall Johnson

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

DUP (element, vector, 4H)

Test 1: uops

Code:

  dup v0.4h, v0.h[1]
  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
10042037150010516862510001000100026452102018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203715006116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203715006116862510001000100026452102018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203715006116862510001000100026452102018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203715006116862510001000100026452102018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203716006116862510001000100026452102018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
10042037150061168625100010001000264521020182037203715713189510001000100020372037111001100030073116111786100020382038203820382038
1004203715006116862510001000100026452102018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203716006116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203715006116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038

Test 2: Latency 1->2

Code:

  dup v0.4h, v0.h[1]
  movi v0.16b, 1
  movi v1.16b, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)03181e1f3f4e51inst 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)9fa1a6a7a8accfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204200371490006119686251010010010000100100005002847521200182003720037184213187451010020010000200100002003720037111020110099100100100001000000071011611197910100001002003820038200382003820180
10204200371490006119686251010010010000100100005002847521200182003720037184213187451010020010000200100002003720037111020110099100100100001000000071011611197910100001002003820038200382003820038
10204200371500006119686251010010010000100100005002847521200182003720037184213187451010020010000200100002003720037111020110099100100100001000000071011611197910100001002003820038200382003820038
10204200371500006119686251010010010000100100005002847521200182008520085184213187451010020010000200100002003720037111020110099100100100001000000071011611197910100001002003820038200382003820038
10204200371500006119686251010010010000104100005002847521200182003720037184213187451010020010000200100002003720037111020110099100100100001000000071011611197910100001002003820038200382003820038
1020420037150017706119686251010010010000100100005002847521200182003720037184213187451010020010000200100002003720037111020110099100100100001000000071011611197910100001002003820038200382003820038
10204200371500006119686251010010010000100100005002847521200182003720037184213187451010020010000200100002003720037111020110099100100100001000000071011611197910100001002003820038200382013220038
10204200371500006119686251010010010000100100005002847521200652003720037184213187451010020010000200100002003720037111020110099100100100001000000071011611197919100001002003820038200382003820038
10204200371500006119686251010010010000100100005002847521200182003720037184213187451010020010000200100002003720037111020110099100100100001000000671011611197910100001002003820038200382003820038
102042003715000061196862510100100100001001000050028475212001820037200371842131874510100200100002001000020037200371110201100991001001000010000000710116111985721100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

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)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
1002420037150053619686251001010100001010000502847521120018020037200371844303187671001020100002010000200372003711100211091010100001000640316331978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521120018020037200371844303187671001020100002010000200372003711100211091010100001000640316331978610000102003820038200382003820038
10024200371500104019686251001010100001010000502847521020018020037200371844303187671001020100002010000200372003711100211091010100001000640316331978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521020018020037200371844303187671001020100002010000200372003711100211091010100001020640316331978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521020018020037200371844303187671001020100002010000200372003711100211091010100001056640316331978610000102003820038200382003820038
1002420037150010319686251001010100001010000502847521020018020037200371844303187671001020100002010000200372003711100211091010100001000640316331978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521020018020037200371844303187671001020100002010000200372003711100211091010100001010640316331978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521020018020037200371844303187671001020100002010000200372003711100211091010100001000640316331978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521020018020037200371844303187671001020100002010000200372003711100211091010100001010640316331978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521020018020037200851844303187671001020100002010168200862003711100211091010100001000640316331978610000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  dup v0.4h, v8.h[1]
  dup v1.4h, v8.h[1]
  dup v2.4h, v8.h[1]
  dup v3.4h, v8.h[1]
  dup v4.4h, v8.h[1]
  dup v5.4h, v8.h[1]
  dup v6.4h, v8.h[1]
  dup v7.4h, v8.h[1]
  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)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)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)9fa8a9acc5branch mispredict (cb)cdcfd5d6e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
802042005715092925801081008000810080020500640132120019020038200389977699898012020080032200800322003820038118020110099100100800001004400111511801620035800001002003920039200392003920039
802042003815024292580108100800081008002050064013202001902003820038997769989801202008003220080032200382003811802011009910010080000100000111511801620035800001002003920039200392003920039
802042003815015292580108100800081008002050064013202001902003820038997769989801202008014220080032200382003811802011009910010080000100000111511801620035800001002003920039200392003920039
80204200381500292580108100800081008002050064013212001932003820038997769989801202008003220080032200382003811802011009910010080000100000111511801620035800001002003920039200392003920039
80204200381500292580108100800081008002050064013212001902003820038997769989801202008003220080032200382003811802011009910010080000100000111511801620035800001002003920039200392003920039
802042003815027292580108100800081008002050064013212001902003820038997769989801202008003220080032200382003811802011009910010080000100000111511801620035800001002003920039200392003920039
80204200381500292580108100800081008002050064013212001902003820038997769989801202008003220080032200382003811802011009910010080000100000111511801620035800001002003920039200392003920039
80204200381500292580108100800081008002050064013212001902003820038997769989801202008003220080032200382003811802011009910010080000100000111511801620035800001002003920039200392003920039
80204200381500292580108100800081008002050064013212001902003820038997769989801202008003220080032200382003811802011009910010080000100000111511801620035800001002003920039200392003920039
80204200381500292580108100800081008002050064013212001902003820038997769989801202008003220080032200382003811802011009910010080000100000111511801620035800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03080b191e3f51inst 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)9fa8cfd5d6ddinst fetch restart (de)e0ea? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242005015000012039258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110910108000010050205164320035080000102003920039200392003920039
8002420038150000039258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010050204164220035080000102003920039200392003920039
80024200381500001539258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110910108000010050204164220035080000102003920039200392003920039
80024200381500003939258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010050204164220035080000102003920039200392003920039
8002420038150000039258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110910108000010050204164420035080000102003920039200392003920039
8002420038150000039258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010050204162420035080000102003920039200392003920039
8002420038150000039258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010050204164320035080000102003920039200392003920039
80024200381500006339448010210800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010050205164420035080000102003920039200392003920039
800242003815000044739258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110910108000010050205164220035080000102003920039200392003920039
8002420038150000039258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010050202164220035080000102003920039200392003920039