Apple M1 Microarchitecture Research by Dougall Johnson

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

SSHL (vector, 2S)

Test 1: uops

Code:

  sshl v0.2s, v0.2s, v1.2s
  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)03070a1e1f3a3f4e51inst 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)accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
100420371611002681687251000100010002646800201820372037157231895100010002000203720371110011000077416441787100020382038203820382038
1004203715117202681687251000100010002646800201820372037157231895100010002000203720371110011000077416441787100020382038203820382038
100420371511002681687251000100010002646800201820372037157231895100010002000203720371110011000077416441787100020382038203820382038
100420371511002681687251000100010002646801201820372037157231895100010002000203720371110011000077416441787100020382038203820382038
100420371611002681687251000100010002646800201820372037157231895100010002000203720371110011000077416441787100020382038203820382038
100420371511002681687251000100010002646800201820372037157231895100010002000203720371110011000077416441787100020382038203820382038
100420371511002681687251000100010002646800201820372037157231895100010002000203720371110011000077416441787100020382038203820382038
100420371511002681687251000100010002646800201820372037157231895100010002000203720371110011000077416441787100020382038203820382038
100420371511002681687251000100010002646800201820372037157231895100010002000203720371110011000077416441787100020382038203820382038
100420371511002681687251000100010002646800201820372037157231895100010002000203720371110011000077416441787100020382038203820382038

Test 2: Latency 1->2

Code:

  sshl v0.2s, v0.2s, v1.2s
  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)030b1e3f4e51inst 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)9fa0a1a6a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204200371500061196872510100100100001001000050028476800200182003720037184220318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
102042003715000611968725101001001000010010000500284768012001820037200371842203187451010020010000200200002003720037111020110099100100100001000005200071011611197910100001002003820038200382003820038
10204200371500061196872510100100100001001000050028476800200182003720037184220318745101002001000020020000200372003711102011009910010010000100000100071011611198490100001002003820038200382003820083
10204200371500061196872510100100100001001000050028476800200182003720037184220318745102562001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371500061196872510100100100001001000050028476800200182003720037184220318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371500061196872510100100100001001000050028476800200182003720037184220318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371500061196872510100100100001001000050028476800200182003720037184220318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371500126311968725101001001000010010000500284768002001820037200371842203187451010020010000200200002003720037111020110099100100100001000000057071011611197910100001002003820038200382003820038
102042003715010124196872510100100100001001000050028476800200182003720037184220318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371500061196872510100100100001001000052228476800200182003720037184220318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)03080b18191e1f3a3f4e51inst 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)9fa0a1a6a7a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024200371500000000611968725100101010000101000050284768012001820037200371844431876710010201000020200002003720037111002110910101000010000000006402162219785010000102003820038200382003820038
10024200371500000000611968725100101010000101000050284768012001820037200371844431876710010201000020200002003720037111002110910101000010000000006402162219785010000102003820038200382003820038
100242003715000009001031968725100101010000101000050284768012001820037200371844481878610010201000020200002003720037111002110910101000010000000006402162219785010000102003820038200382003820038
100242003715000001500611968725100101010000101000050284768002001820037200371844431876710010201000020200002003720037111002110910101000010000000306402162219785010000102003820038200382003820038
100242003715000000005601968725100101010012101000050284768012001820085200371844431876710010201016820204602008420037111002110910101000010000012006402162219785010000102003820038200382003820038
100242003715000001800611968725100101010000101000050284768012001820037200831844431878610166201000020200002003720037111002110910101000010000000006402162219785010000102003820038200382003820038
10024200371500000000821968725100101010000101000050284768012006520037200371844431876710010201000020200002003720037111002110910101000010000000306402162219785010000102003820038200382003820038
10024200371500000000611968725100101010000101000050284768012001820037200371844431876710010201000020200002003720037111002110910101000010000000006402162219785010000102003820038200382003820038
10024200371500000000611968725100101010000101000050284768012001820037200371844431876710010201000020200002003720037111002110910101000010000000306402162219785010000102003820038200382003820038
10024200371500000000611968725100101010000101000050284768012001820037200371844431876710010201000020200002003720037111002110910101000010000000006402162219785010000102003820038200382003820038

Test 3: Latency 1->3

Code:

  sshl v0.2s, v1.2s, v0.2s
  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)03080b18191e1f3f4e51inst 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
10204200371500000240389196872510100100100001001000050028476800200182003720037184223187451010020010000200200002003720037111020110099100100100001000000015071011611197910100001002003820038200382003820038
102042003714900000061196872510100100100001001000050028476800200182003720037184223187451010020010000200200002003720037111020110099100100100001000000015071011611197910100001002003820038200382003820038
10204200371500000006119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371500000306119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371500000006119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371500000006119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
1020420037150000000611968725101001001000010010000500284768002001820037200371842231874510100200100002002000020037200371110201100991001001000010000000213071011611197910100001002003820038200382003820038
10204200371500000006119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371500000006119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371500000006119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)030b1e3f4e51inst 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)9fa0a1accfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100242003715000611968725100101010000101000050284768020018200372003718444318767100102010000202000020037200371110021109101010000100006402162219785010000102003820038200382003820038
100242003715000611968725100101010000101000050284768020018200372003718444318767100102010000202000020037200371110021109101010000100006402162219785010000102003820038200382003820038
100242003715000611968725100101010000101000050284768020018200372003718444318767100102010000202000020037200371110021109101010000100006402162219785110000102003820038200382003820038
1002420037150001561968725100101010000101000050284768020018200372003718444318767100102010000202000020037200371110021109101010000100006402162219785010000102003820038200382003820038
1002420037150024611968725100101010000101000050284768020018200372003718444318767100102010000202000020037200371110021109101010000100006402162219785010000102003820038200382003820038
10024200371500150611968725100101010000101000050284768020018200372003718444318767100102010000202000020037200371110021109101010000100006402162219785010000102003820038200382003820038
10024200371500252611968725100101010000101000050284768020018200372003718444318767100102010000202000020037200371110021109101010000100006402162219785010000102003820038200382003820038
10024200371500252611968725100101010000101000050284768020018200372003718444318767100102010000202000020037200371110021109101010000100006402162219785010000102003820038200382003820038
100242003715000611968725100101010000101000050284768020018200372003718444318767100102010000202000020037200371110021109101010000100006402162219785010000102003820038200382003820038
100242003715000611968725100101010000101000050284768020018200372003718444318767100102010000202000020037200371110021109101010000100006402162219785010000102003820038200382003820038

Test 4: throughput

Count: 8

Code:

  sshl v0.2s, v8.2s, v9.2s
  sshl v1.2s, v8.2s, v9.2s
  sshl v2.2s, v8.2s, v9.2s
  sshl v3.2s, v8.2s, v9.2s
  sshl v4.2s, v8.2s, v9.2s
  sshl v5.2s, v8.2s, v9.2s
  sshl v6.2s, v8.2s, v9.2s
  sshl v7.2s, v8.2s, v9.2s
  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)030a18191e1f3f51inst 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)6061696d6edispatch 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)9fa0a6a8accfd0d5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
802042006015000000402580100100800001008000050064000015200192003820038997339996801002008000020016000020038200381180201100991001008000010000005110521611200350800001002003920039200392003920039
802042003815000000402580100100800001008000050064000015200192003820038997339996801002008000020016000020038200381180201100991001008000010000305110511611200350800001002003920039200392003920039
802042003815000000402580100100800001008000050064000015200192003820038997339996801002008000020016000020038200382180201100991001008000010000481685110511611200350800001002003920039200392003920039
802042003815000000822580100100800001008000050064000010200192003820038997339996801002008000020016000020038200381180201100991001008000010000005110521611200350800001002003920039200392003920039
802042003815000000402580100100800001008000050064000015200192003820038997339996801002008000020016000020038200381180201100991001008000010000005110511611200350800001002003920039200392003920039
802042003815000000402580100100800001008000050064000015200192003820038997339996801002008000020016000020038200381180201100991001008000010000105110511611200350800001002003920039200392003920039
80204200381500000040258010010080000100800005006400001520019200382003899733999680100200800002001600002003820038118020110099100100800001000001355110511611200350800001002003920039200392003920039
802042003814900000402580100100800001008000050064000015200192003820038997339996801002008000020016000020038200381180201100991001008000010000005110511611200350800001002003920039200392003920039
8020420038150000009625801001008000010080000500640000152001920038200389973310030801002008000020016000020038200381180201100991001008000010000005110511611200350800001002003920039200392003920039
802042003815000000402580100100800001008000050064000015200192003820038997339996801002008000020016000020038200381180201100991001008000010000005110511611200350800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03040a18193f51inst 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)9fa8acbranch mispredict (cb)cfitlb miss (d4)d5d6ddinst fetch restart (de)e0ec? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8002420048150100039258001010800001080000506400002001920038200389996310018800102080000201600002003820038118002110910108000010000502001416141720035080000102003920039200392003920039
8002420038150000039258001010800001080000506400002001920038200389996310018800102080000201600002003820038118002110910108000010000502111716171820035080000102003920039200392003920039
800242003815010003925800101080000108000050640000200192003820038999631001880010208000020160000200382003811800211091010800001000050211916171420035080000102003920039200392003920039
8002420038150100039258001010800001080000506400002001920038200389996310018800102080000201600002003820038118002110910108000010000502001716171720035080000102003920039200392003920039
8002420038150000039258001010800001080000506400002001920038200389996310018800102080000201600002003820038118002110910108000010000502001716171720035080000102003920039200392003920039
8002420038150000039258001010800001080000506400002001920038200389996310018800102080000201600002003820038118002110910108000010000502001716171720035080000102003920039200392003920039
8002420038150000039258001010800001080000506400002001920038200389996310018800102080000201600002003820038118002110910108000010100502001416151720035080000102003920039200392003920039
8002420038150000039258001010800001080000506400002001920038200389996310018800102080000201600002003820038118002110910108000010000502001416171420035080000102003920039200392003920039
8002420038150000039258001010800001080000506400002001920038200389996310018800102080000201600002003820038118002110910108000010100502001816101720035080000102003920039200392003920039
800242003815000003925800101080000108000050640000200192003820038999631001880010208000020160000200382003811800211091010800001000050200161691620035080000102003920039200392003920039