Apple M1 Microarchitecture Research by Dougall Johnson

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

UHSUB (vector, 16B)

Test 1: uops

Code:

  uhsub v0.16b, 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)030a1e3f4e51inst 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)cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
10042037150061168725100010001000264680020182037203715723189510001000200020372037111001100073116111787100020382038203820382038
10042037150061168725100010001000264680020182037203715723189510001000200020372037111001100073116111787100020382038203820382038
1004203715015126168725100010001000264680020182037203715723189510001000200020372037111001100073116111787100020382038203820382038
10042037150961168725100010001000264680020182037203715723189510001000200020372037111001100073116111787100020382038203820382038
10042037150961168725100010001000264680020182037203715723189510001000200020372037111001100073116111787100020382038203820382038
10042037150361168725100010001000264680020182037203715723189510001000200020372037111001100073140111787100020382038203820382038
10042037150061168725100010001000264680020182037203715723189510001000200020372037111001100073116111787100020382038203820382038
10042037150061168725100010001000264680020182037203715723189510001000200020372037111001100073116111787100020382038203820382038
10042037150061168725100010001000264680020182037203715723189510001000200020372037111001100073116111787100020382038203820382038
10042037150061168725100010001000264680020182037203715723189510001000200020372037111001100073116111787100020382038203820382038

Test 2: Latency 1->2

Code:

  uhsub v0.16b, 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): 2.0037

retire (01)cycle (02)03081e1f3a3f4e51inst 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
10204200371500000611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010015071011611197910100001002003820038200382003820038
10204200371500000611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010002471011611197910100001002003820038200382003820038
1020420037150000061196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
10204200371490000156196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
10204200371500000916196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
1020420037150000061196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
1020420037150090061196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
1020420037150000061196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
1020420037150000061196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
1020420037150000061196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)033f4e51inst 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)9fa8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100242003715061196872510010101000010100005028476802001820037200371844431876710010201000020200002003720037111002110910101000010312004640216221978510000102003820038200382003820038
10024200371506119687251001010100001010000502847680200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
10024200371506119687251001010100001010000502847680200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
10024200371506119687251001010100001010000502847680200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
10024200371506119687251001010100001010000502847680200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
10024200371506119687251001010100001010000502847680200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
10024200371506119687251001010100001010000502847680200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
10024200371506119687251001010100001010000502847680200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
1002420037150611966725100101010000101000050284768020018200372003718444318767100102010000202000020037200371110021109101010000102812640216221978510000102003820038200382003820038
10024200371506119687251001010100001010000502847680200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038

Test 3: Latency 1->3

Code:

  uhsub v0.16b, 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): 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)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)9fa7a8a9acc2cdcfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102042003715006119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100000630071011611197910100001002003820038200382003820038
10204200371500611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010000000071011611197910100001002003820038200382003820038
102042003715006119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100038030071011611197910100001002003820038200382003820038
10204200371500611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010000000071011611197910100001002003820038200382003820038
102042003715006119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100021000071011611197910100001002003820038200382003820038
10204200371500611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010000000071011611197910100001002003820038200382003820038
10204200371500611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010000000071011611197910100001002003820038200382003820038
10204200371500611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010004001350071011611197910100001002003820038200382003820038
10204200371500611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010000000071011611197910100001002003820038200382003820038
10204200371500611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010000000071011611197910100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)03070a1e3a3f4e51inst 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)9fa6a7a8a9accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024200371501102681968725100101010000101000050284768002001802003720037184443187671001020100002020000200372003711100211091010100001000280064411161051978510000102003820038200382003820038
1002420037150110268196872510010101000010100005028476800200180200372003718444318767100102010000202000020037200371110021109101010000100000064410167121978510000102003820038200382003820038
10024200371501102681968725100101010000101000050284768002001802003720037184443187671001020100002020000200372003711100211091010100001000100644121612101978510000102003820038200382003820038
10024200371501102681968725100101010000101000050284768002001802003720037184443187671001020100002020000200372003711100211091010100001000510364410161051978510000102003820038200382003820038
10024200371501102681968725100101010000101000050284768002001802003720037184443187671001020100002020000200372003711100211091010100001000100644101610101978510000102003820038200382003820038
1002420037150110268196872510010101000010100005028476800200180200372003718444318767100102010000202000020037200371110021109101010000100010364410161051978510000102003820038200382003820038
10024200371501102681968725100101010000101000050284768002001802003720037184443187671001020100002020000200372003711100211091010100001000106644111610101978510000102003820038200382003820038
1002420037150110268196872510010101000010100005028476800200180200372003718444318767100102010000202000020037200371110021109101010000100002064410165101978510000102003820038200382003820038
10024200371501102681968725100101010000101000050284768002001802003720037184443187671001020100002020000200372003711100211091010100001000000644101610101978510000102003820038200382003820038
10024200371501102681968725100101010000101000050284768002001802003720037184443187671001020100002020000200372003711100211091010100001000106644101610101978510000102003820038200382003820038

Test 4: throughput

Count: 8

Code:

  uhsub v0.16b, v8.16b, v9.16b
  uhsub v1.16b, v8.16b, v9.16b
  uhsub v2.16b, v8.16b, v9.16b
  uhsub v3.16b, v8.16b, v9.16b
  uhsub v4.16b, v8.16b, v9.16b
  uhsub v5.16b, v8.16b, v9.16b
  uhsub v6.16b, v8.16b, v9.16b
  uhsub v7.16b, 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)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)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
802042005915091632580100100800001008000050064000012001920038200389973399968010020080000200160000200382003811802011009910010080000100051102161120035800001002003920039200392003920039
802042003815001492580100100800001008000050064000012001920038200389973399968010020080000200160000200382003811802011009910010080000100051101161120035800001002003920039200392003920039
80204200381500452580100100800001008000050064000012001920038200389973399968010020080000200160000200382003811802011009910010080000100051101161120035800001002003920039200392003920039
802042003815004102580100100800001008000050064000012001920038200389973399968010020080000200160000200382003811802011009910010080000100151101161120035800001002003920039200392003920039
802042003815003232580100100800001008000050064000012001920038200389973399968010020080000200160000200382003811802011009910010080000100051101161120035800001002003920039200392003920039
80204200381500632580100100800001008000050064000012001920038200389973399968010020080000200160000200382003811802011009910010080000100051101161120035800001002003920039200392003920039
802042003815001032580100100800001008000050064000012001920038200389973399968010020080000200160000200382003811802011009910010080000100051101161120035800001002003920039200392003920039
80204200381500402580100100800001008000050064000012001920038200389973399968010020080000200160000200382003811802011009910010080000100051101161120035800001002003920039200392003920039
80204200381500822580100100800001008000050064000012001920038200389973399968010020080000200160000200382003811802011009910010080000100051101161120035800001002003920039200392003920039
8020420038150013082580100100800001008000050064000012001920038200389973399968010020080000200160000200382003811802011009910010080000100051101161120035800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)0308090a0b18191e1f3f51inst 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)9fa0a1a6a8a9acc2c5cfd5d6ddinst fetch restart (de)e0? int output thing (e9)eb? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242004015000000000102258001010800001080000506400000200192003820038999631001880010208000020160000200382003811800211091010800001000000000502031632200350080000102003920039200392003920039
800242003815000000000791258001010800001080000506400000200192003820038999631001880010208000020160000200382003811800211091010800001000000001502021622200350080000102003920039200892003920039
800242003815000000000171258001010800761080000506400000200192003820038999631001880010208000020160000200382003811800211091010800001000000000502021622200350080000102003920039200392003920039
800242003815000000000188258001010800001080000506400001200192003820038999631001880010208000020160000200382003811800211091010800001000000000502021632200350080000102003920039200392003920039
80024200381500000000085258001010800001080000506400000200192003820038999631001880010208000020160000200382003811800211091010800001000000000502021622200350080000102003920039200392003920039
80024200381500000000039258001010800001080000506400001200192003820038999631001880010208000020160000200382003811800211091010800001000000000502021622200350080000102003920039200392003920039
80024200381500000000039258001010800001080000506400001200192003820038999631001880010208000020160000200382003811800211091010800001000000000502021622200350080000102003920039200392003920039
80024200381500000000039258001010800001080000506400001200192003820038999631001880010208000020160000200382003811800211091010800001000000000502021623200350080000102003920039200392003920039
800242003815000000000213258001010800001080000506400000200192003820038999631001880010208000020160000200382003811800211091010800001000000000502031622200350080000102003920039200392003920039
80024200381500000000039258001010800001080000506400000200192003820038999631001880010208000020160000200382003811800211091010800001000000000502021642200350080000102003920039200392003920039