Apple M1 Microarchitecture Research by Dougall Johnson

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

SADDLP (vector, 2S)

Test 1: uops

Code:

  saddlp v0.2s, v0.4h
  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)a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203715061168625100010001000264521120182037203715713189510001000100020372037111001100044073116111786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203715010316862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
100420371606116862510001000100026452112018203720371571318951000100010002037203711100110004073116111786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038

Test 2: Latency 1->2

Code:

  saddlp v0.2s, v0.4h
  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)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)9fa6a8accfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020420037150006119686251010010010000100100005002847521120018020037200371842131874510100200100002001000020037200371110201100991001001000010000071021622197910100001002003820038200382003820038
1020420037150006119686251010010010000100100005002847521120018020037200371842131874510100200100002001000020037200371110201100991001001000010000071021622197910100001002003820038200382003820038
1020420037150006119686251010010010000100100005002847521120018020037200371842131874510100200100002001000020037200371110201100991001001000010000071021622197910100001002003820038200382003820038
1020420037150006119686251010010010000100100005002847521120018020037200371842131874510100200100002001000020037200371110201100991001001000010000071021622197910100001002003820038200382003820038
10204200371500015619686251010010010000100100005002847521120018020037200371842131874510100200100002001000020037200371110201100991001001000010000071021622197910100001002003820038200382003820038
1020420037150006119686251010010010000100100005002847521120018020037200371842131874510100200100002001000020037200371110201100991001001000010000071021622197910100001002003820038200382003820038
1020420037150006119686251010010010000100100005002847521120018020037200371842131874510100200100002001000020037200371110201100991001001000010000071021622197910100001002003820038200382003820038
1020420037150006119686251010010010000100100005002847521120018020037200371842131874510100200100002001000020037200371110201100991001001000010000071021622197910100001002003820038200382003820038
1020420037150006119672251010010010000100100005002847521120018020037200371842131874510100200100002001000020037200371110201100991001001000010000071021622197910100001002003820038200382003820038
10204200371500061196862510100100100001001000050028475211200180200372003718421318745101002001000020010000200372003711102011009910010010000100011971021622197910100001002003820038200382003820038

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)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)9fa6a7a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1002420037150086019686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
10024200371500127219686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
1002420037150061196862510010101000010100005028475210200182003720037184433187671001020100002010000200372003711100211091010100001000140640216221978610000102003820038200382003820038
1002420037150020819686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
1002420037150053619686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  saddlp v0.2s, v8.4h
  saddlp v1.2s, v8.4h
  saddlp v2.2s, v8.4h
  saddlp v3.2s, v8.4h
  saddlp v4.2s, v8.4h
  saddlp v5.2s, v8.4h
  saddlp v6.2s, v8.4h
  saddlp v7.2s, v8.4h
  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)03181e1f3f51inst 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)9fa0a1a8acc5branch mispredict (cb)cdcfd5d6inst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
802042006115000015925801081008000810080020500640132020019200382003899776998980120200800322008003220038200381180201100991001008000010000001115118216020035800001002003920039200392003920039
802042003815000013425801081008000810080020500640132020019200382003899776998980120200800322008003220038200381180201100991001008000010000001115118016020035800001002003920039200392003920039
802042003815000029258010810080008100800205006401320200192003820038997769989801202008003220080032200382003811802011009910010080000100002201115118016020035800001002003920039200392003920039
802042003814900016125801081008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010000001115118016020035800001002003920039200392003920039
80204200381500005025801081008000810080020500640132020019200382003899776998980120200800322008003220038200381180201100991001008000010000001115118016020035800001002003920039200392003920039
802042003815000019725801081008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010000101115118016020035800001002003920039200392003920039
8020420038150000197258010810080008100800205006401321200192010020038997712998980120200800322008003220098200381180201100991001008000010000201115118016020035800001002003920039200392003920039
802042003815000029258010810080104100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100002518731115118016020035800001002003920039200392003920039
802042003815001328889025801081008000810080020500640132020019200382003899776998980120200800322008003220038200381180201100991001008000010000001115118016020035800001002003920039200392003920039
8020420038150000117125801081008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010000101115118016020035800001002003920039200392003920039

1000 unrolls and 10 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)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)9fa0a8a9accfd5d6ddinst fetch restart (de)e0ea? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200511500000104258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010000050203161120035080000102003920039200392003920039
80024200381500000392580010108000010800005064000012001920038200389996310018800102080000208000020038200381180021109101080000100460050201161120035080000102003920039200392003920039
8002420038150000039258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010000050201161120035080000102003920039200392003920039
8002420038150000039258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010000050201162220035080000102003920039200392003920039
8002420038150000045258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010000050202162220035080000102003920039200392003920039
8002420038150000062258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010000050202161120035080000102003920039200392003920039
80024200381500000104258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010000050201161120035080000102003920039200392003920039
8002420038150000039258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010000050201161120035080000102003920039200392003920039
80024200381500000508258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010000050201161120035080000102003920039200392003920039
80024200381500000729258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010020050201161120035080000102003920039200392003920039