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, 8B)

Test 1: uops

Code:

  sshl v0.8b, v0.8b, v1.8b
  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)031e3f4e51inst 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)a8cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
10042037150611687251000100010002646800201820372037157231895100010002000203720371110011000073216231785100020382038203820382038
10042037150611687251000100010002646801201820372037157331895100010002000203720371110011000073216221787100020382038203820382038
10042037150611687251000100010002646801201820372037157231895100010002000203720371110011000073216221787100020382038203820382038
10042037150611687251000100010002646801201820372037157231895100010002000203720371110011000073216221787100020382038203820382038
10042037150611687251000100010002646801201820372037157231895100010002000203720371110011000073216331787100020382038203820382038
10042037150611687251000100010002646801201820372037157231895100010002000203720371110011000075216231785100020382038203820382038
100420371602321687251000100010002646800201820372037157231895100010002000203720371110011000073216221787100020382038203820382038
10042037160611687251000100010002646801201820372037157231895100010002000203720371110011000075216221787100020382038203820382038
10042037150611687251000100010002646801201820372037157231895100010002000203720371110011000073216221787100020382038203820382038
10042037150611687251000100010002646801201820372037157231895100010002000203720371110011000073216221787100020382038203820382038

Test 2: Latency 1->2

Code:

  sshl v0.8b, v0.8b, v1.8b
  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)03091e3f4e51inst 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)9fa8a9acc5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204200371500061196872510100100100001001000050028476800200182003720037184296187411010020010008200200162003720037111020110099100100100001000001117170160019802100001002003820038200382003820038
10204200371500061196872510100100100001001000050028476800200182003720037184427187411010020010008200200162003720037111020110099100100100001000000007101161119791100001002003820038200382003820038
102042003715000103196872510100100100001001000052228476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000000007101161119791100001002003820038200382003820038
102042003715000124196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000000007101161119791100001002003820038200382003820038
102042003715000145196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000000007101161119791100001002003820038200382003820038
10204200371500061196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000000007101161119791100001002003820038200382003820038
10204200371500061196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000000007101161119791100001002003820038200382003820038
10204200371500061196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000000007101161119791100001002003820038200382003820038
10204200371500061196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000000007101161119791100001002003820038200382003820038
10204200371500061196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000000007101161119791100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)033a3f4e51inst 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
1002420037150243719687251001010100001010000502847680120018200372003718444318767100102010000202000020037200371110021109101010000100064410161051978510000102003820038200382003820038
100242003715026619687251001010100001010000502847680020018200372003718444318767100102010000202000020037200371110021109101010000100064410165101978510000102003820038200382003820038
1002420037150266196872510010101000010100005028476800200182003720037184443187671001020100002020000200372003711100211091010100001000644101610101978510000102003820038200382003820038
10024200371502661968725100101010000101000050284768012001820037200371844431876710010201000020200002003720037111002110910101000010615644101610111978510000102003820038200382003820038
100242003715026619687251001010100001010000502847680120018200372003718444318767100102010000202000020037200371110021109101010000100064410161081978510000102003820038200382003820038
1002420037150266196766110023101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000644101610101978510000102003820038200382003820038
1002420037150266196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000644101610101978510000102003820038200382003820038
1002420037150266196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000644101610101978510000102003820038200382003820038
1002420037150266196872510010101000010100005028476800200182003720037184443187671001020100002020000200372003711100211091010100001000644101610101978510000102003820038200382003820038
1002420037150266196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000644101610101978510000102003820038200382003820038

Test 3: Latency 1->3

Code:

  sshl v0.8b, v1.8b, v0.8b
  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)9fa1a6a8cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102042003715041161196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
102042003715047161196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
1020420037150061196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
1020420037150061196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
1020420037150061196872510100100100001001000050028476800200182003720037184223187451010020010000200200002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
1020420037150089196872510100100100001001000050028476800200182003720037184223187451010020010000200200002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
102042003715024361196872510100100100001001000050028476800200182003720037184223187451010020010000200200002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
1020420037150061196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
1020420037150061196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
102042003715048661196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000307101161119791100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)031e1f3f4e51inst 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)9faccfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024200371500061196872510010101000010100005028476800200180200372003718444318767100102010000202000020037200371110021109101010000100640216221978510000102003820038200382003820038
10024200371500061196872510010101000010100005028476800200180200372003718444318767100102010000202000020037200371110021109101010000100640316221978510000102003820038200382003820038
1002420037150917661196872510010101000010100005028476801200180200372003718444318767100102010000202000020037200371110021109101010000100640216221978510000102003820038200382003820038
10024200371490061196872510010101000010100005028476800200180200372003718444318767100102010000202000020037200371110021109101010000100640216221978510000102003820038200382003820038
10024200371500061196872510010101000010100005028476800200180200372003718444318767100102010000202000020037200371110021109101010000100640216221978510000102003820038200382003820038
10024200371500061196872510010101000010100005028476800200180200372003718444318767100102010000202000020037200371110021109101010000100640216221978510000102003820038200382003820038
10024200371500061196872510010101000010100005028476800200180200372003718444318767100102010000202000020037200371110021109101010000100640216221978510000102003820038200382003820038
10024200371500061196872510010101000010100005028476800200180200372003718444318767100102010000202000020037200371110021109101010000100640216221978510000102003820038200382003820038
10024200371500061196872510010101000010100005028476800200180200372003718444318767100102010000202000020037200371110021109101010000100640216221978510000102003820038200382003820038
10024200371500061196872510010101000010100005028476800200180200372003718444318767100102010000202000020037200371110021109101010000100640216221978510000102003820038200382003820038

Test 4: throughput

Count: 8

Code:

  sshl v0.8b, v8.8b, v9.8b
  sshl v1.8b, v8.8b, v9.8b
  sshl v2.8b, v8.8b, v9.8b
  sshl v3.8b, v8.8b, v9.8b
  sshl v4.8b, v8.8b, v9.8b
  sshl v5.8b, v8.8b, v9.8b
  sshl v6.8b, v8.8b, v9.8b
  sshl v7.8b, v8.8b, v9.8b
  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)0308090b18191e1f3a3f51inst 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)9fa0a8a9acbranch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8020420058150000000004025801001008000010080000500640000020019200382003899730399968010020080000200160000200382003811802011009910010080000100000000511031611200350800001002003920039200392003920039
8020420038150000000004025801001008000010080000500640000020019200382003899730399968010020080000200160000200382003811802011009910010080000100000000511011611200350800001002003920039200392003920039
8020420038150000000004025801001008000010080000500640000020019200382003899730399968010020080000200160000200382003811802011009910010080000100000000511011611200350800001002003920039200392003920039
8020420038150000000004025801001008000010080000500640000120019200382003899730399968010020080000200160000200382003811802011009910010080000100000000511011611200350800001002003920039200392003920039
8020420038150000000004025801001008000010080000500640000020019200382003899730399968010020080000200160000200382003811802011009910010080000100000000511011611200350800001002003920039200392003920039
8020420038150000000004025801001008000010080000500640000020019200382003899730399968010020080000200160000200382003811802011009910010080000100000000511011611200350800001002003920039200392003920039
8020420038150000000004025801001008000010080000500640000020019200382003899730399968010020080000200160000200382003811802011009910010080000100000000511011611200350800001002003920039200392003920039
8020420038150000000004025801001008000010080000500640000120019200382003899730399968010020080000200160000200382003811802011009910010080000100000000511021611200350800001002003920039200392003920039
80204200381500000000034825801001008000010080000500640000120019200382003899730399968010020080000200160000200382003811802011009910010080000100000000511011621200350800001002003920039200392003920039
8020420038151000000004025801001008000010080000500640000020019200382003899730399968010020080000200160000200382003811802011009910010080000100000000511011611200350800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)031e3a3f51inst 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)9fa0a8a9acc2cfd5d6daddinst fetch restart (de)e0ea? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8002420048150534039258001010800001080000506400001200192003820038999631001880010208000020160000200382003811800211091010800001001000502026160272720035080000102003920039200392003920039
8002420038150357039258001010800001080000506400000200192003820087999631001880010208000020160000200382003811800211091010800001000000502016270271120035080000102003920039200392003920039
80024200381500039258001010800001080000506400000200192003820038999631001880010208000020160000200382003811800211091010800001000000502015160271420035080000102003920039200392003920039
800242003815024039258001010800001080000506400001200192003820038999631001880010208000020160000200382003811800211091010800001000000502024160142720035080000102003920039200392003920039
80024200381500239258001010800001080000506400001200192003820038999631001880010208000020160000200382003811800211091010800001000000502027160202720035080000102003920039200392003920039
80024200381500039258001010800001080000506400000200192003820038999631001880010208000020160000200382003811800211091010800001000000502020160271620035080000102003920039200392003920039
80024200381500039258001010800001080000506400001200192003820038999631001880010208000020160000200382003811800211091010800001000000502026160272620035080000102003920039200392003920039
8002420038150267039258001010800001080000506400001200192003820038999631001880010208000020160000200382003811800211091010800001000000502027160272720035080000102003920039200392003920039
80024200381500060258001010800001080000506400001200192003820038999631001880010208000020160000200382003811800211091010800001000000502020160262220035080000102003920039200392003920039
80024200381500039258001010800001080000506400001200192003820038999631001880010208000020160000200382003811800211091010800001000030502027160272720035080000102003920039200392003920039