Apple M1 Microarchitecture Research by Dougall Johnson

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

REV16 (vector, 16B)

Test 1: uops

Code:

  rev16 v0.16b, v0.16b
  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)0308091e3f4e51inst issue (52)~issue fp/simd (54)~dispatch fp/simd (57)huge thing fp/simd (5b)696d6edispatch 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
1004203716000611686251000100010002645212018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
10042037160006116862510001000100026452120182037203715713189510001000100020372037111001100033073116111786100020382038203820382038
10042037150060611686251000100010002645212018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203715000611686251000100010002645212018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203715000611686251000100010002645212018203720371571318951000100010002037203711100110008073116111786100020382038203820382038
1004203716000821686251000100010002645212018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
10042037150006116862510001000100026452120182037203715713189510001000100020372037111001100016073116111786100020382038203820382038
1004203715000611686251000100010002645212018203720371571318951000100010002037203711100110000373116111786100020382038203820382038
1004203715000611686251000100010002645212018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203715000611686251000100010002645212018203720371571318951000100010002037203711100110000073116111786100020382038203820382038

Test 2: Latency 1->2

Code:

  rev16 v0.16b, 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)0309181e3f4e51inst 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)9fa8accdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102042003715000061196862510100100100001001000050028475210200182003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
102042003715000061196862510100100100001001000050028475210200182003720037184213187451010020010000200100002003720037111020110099100100100001000007101171119791100001002003820038200382003820038
1020420037150000611968625101001001000010010000500284752102001820037200371842131874510100200100002001000020037200371110201100991001001000010051607101161119791100001002003820038200382003820038
10204200371500054595196862510100100100001001000050028475210200182003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
102042003715000061196862510100100100001001000050028475210200182003720037184213187451010020010000200100002003720037111020110099100100100001000307101161119791100001002003820038200382003820038
1020420037150001561196862510100100100001001000050028475210200182003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
102042003715000061196862510100100100001001000050028475210200182003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
102042003715000061196862510100100100001001000050028475210200182003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
102042003715000061196862510100100100001001000050028475210200182003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
102042003715000082196862510100100100001001000050028475210200182003720037184213187451010020010332200100002003720037111020110099100100100001001307103161119931100001002003820232200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)0308090b1e3f4e51inst 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)9fa8acc5cdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024200371500000611968625100101010000101000050284752120018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
10024200371501000611968625100101010000101000050284752120018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
10024200371500000611968625100101010000101000050284752120018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
100242003715000030611968625100101010000101000050284752120018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
10024200371500000611968625100101010000101000050284752120018200372003718443318767100102010000201000020037200371110021109101010000100900640216221978610000102003820038200382003820038
10024200371500000611968625100101010000101000050284752120018200372003718443318767100102010000201000020037200371110021109101010000100010640216221978610000102003820038200382003820038
10024200371500000611968625100101010000101000050284752120018200372003718443318767100102010000201000020037200371110021109101010000102000640216221978610000102003820038200382003820038
10024200371500000611968625100101010000101000050284752120018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
10024200371500000611968625100101010000101000050284752120018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
10024200371500000611968625100101010000101000050284752120018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  rev16 v0.16b, v8.16b
  rev16 v1.16b, v8.16b
  rev16 v2.16b, v8.16b
  rev16 v3.16b, v8.16b
  rev16 v4.16b, v8.16b
  rev16 v5.16b, v8.16b
  rev16 v6.16b, v8.16b
  rev16 v7.16b, v8.16b
  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)0318191e1f3f51inst 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)9fa0a6a8a9acc5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
802042004815000002925801081008000810080020500640132120019200382003899770699898012020080032200800322003820038118020110099100100800001000000011151180160020035800001002014420102200392035620039
802042003815000011629258010810080008100800205006401321200192003820104998601210015802262008013720080230201032015521802011009910010080000100230254011151520160020035800001002003920039200392003920091
802042003815000002925801081008000810080020500640132020019200382003899770699898012020080032200800322003820038118020110099100100800001000000011151180160020035800001002003920039200392003920039
802042003815000002925801081008000810080020500640132120019200382003899770699898012020080032200800322003820038118020110099100100800001000000011151180160120035800001002003920039200392003920039
802042003815000002925801081008000810080020500640132020019200382003899770699898012020080032200800322003820038118020110099100100800001000000011151180160020035800001002003920039200392003920039
802042003815000002925801081008000810080020500640132020019200382003899770699898012020080032200800322003820038118020110099100100800001000000011151180160020035800001002003920039200392003920039
802042003815000002925801081008000810080020500640132120019200382003899777699898012020080032200800322003820038118020110099100100800001000000011151180160020035800001002003920242200392003920039
802042003815000002925801081008000810080020500640132120019200382003899770699898012020080032200800322003820038118020110099100100800001000000011151180160020035800001002003920039200392003920039
802042003815000002925801081008000810080020500640132020019200382003899770699898012020080032200800322003820038118020110099100100800001000000011151180160020035800001002003920039200392003920039
802042003815000002925801081008000810080020500640132020019200382003899770699898012020080032200800322003820038118020110099100100800001000000011151180160020035800001002003920039200392003920039

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)6061696d6edispatch 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)9fa7a8acc2cfd0d2d5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200401502139258001010800001080000506400001520019200382003899960310018800102080000208000020038200381180021109101080000100000502050121613122003580000102003920039200392003920039
8002420038150039258001010800001080000506400001520019200382003899960310018800102080000208000020038200381180021109101080000100030502050121613122003580000102003920039200392003920039
80024200381506939258001010800001080000506400001520019200382003899960310018800102080000208000020038200381180021109101080000100000502052111613122003580000102003920039200392003920039
80024200381502439258001010800001080000506400001520019200382003899960310018800102080000208000020038200381180021109101080000100000502052121612122003580000102003920039200392003920039
8002420038150939258001010800001080000506400001520019200382003899960310018800102080000208000020038200381180021109101080000100030502052131613112003580000102003920039200392003920039
8002420038150039258001010800001080000506407601520019200382003899960310018800102080000208000020038200381180021109101080000100002502054101612112003580000102003920039200392003920039
80024200871504839258001010800001080000506400000520019200382003899960310018800102080000208000020038200381180021109101080000100000502050121612122003580000102003920039200392003920039
8002420038150039258001010800001080000506400001520019200382003899960310018800102080000208000020038200381180021109101080000100030502054131612112003580000102003920039200392003920086
8002420038150060258001010800001080000506400001020019200382003899960310018800102080000208000020038200381180021109101080000100130502000121613102003580000102003920039200392003920039
8002420038150039258001010800001080193506400000020019200382003899960310018800102080000208000020038200381180021109101080000100030502004121611112003580000102003920039200392003920039