Apple M1 Microarchitecture Research by Dougall Johnson

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

DUP (element, vector, 4S)

Test 1: uops

Code:

  dup v0.4s, v0.s[1]
  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)03181e3f4e51inst 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)a8acc2cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
10042037150061168625100010001000264521120182037203715713189510001000100020372037111001100000073316331786100020382038203820382038
10042037150061168625100010001000264521120182037203715713189510001000100020372037111001100000073216331786100020382038203820382038
10042037150061168625100010001000264521120182037203715713189510001000100020372037111001100000073216331786100020382038203820382038
10042037150061168625100010001000264521120182037203715713189510001000100020372037111001100000073316331786100020382038203820382038
100420371500821686251000100010002645211201820372037157131895100010001000203720371110011000012073316331786100020382038203820382038
10042037150061168625100010001000264521120182037203715713189510001000100020372037111001100000073316331786100020382038203820382038
10042037150061168625100010001000264521120182037203715713189510001000100020372037111001100000073316331786100020382038203820382038
10042037150061168625100010001000264521120182037203715713189510001000100020372037111001100000073316321786100020382038203820382038
10042037150061168625100010001000264521120182037203715713189510001000100020372037111001100000073316331786100020382038203820382038
10042037150061168625100010001000264521120182037203715713189510001000100020372037111001100000073316321853100020382038203820382038

Test 2: Latency 1->2

Code:

  dup v0.4s, v0.s[1]
  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)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)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)9fa6a8a9acbranch mispredict (cb)cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020420037150001491968625101001001000010010000626284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000000710116111979125100001002003820038200382003820038
10204200371500061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000000071211611197910100001002003820038200382003820038
10204200371500061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000000071011611197910100001002003820038200382003820038
10204200371500061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000000071011611197910100001002003820038200382003820038
1020420037150004911968625101001001000010010000626284752112001820037200371842131874510100200100002001000020084200371110201100991001001000010000000710116221979125100001002003820038200382003820038
102042003715000126196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000000071011611197910100001002003820038200382003820038
102042003715000166196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000000071011611197910100001002003820038200382003820038
10204200371500061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000000071011611197910100001002003820038200382003820038
102042003715000191196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000000071011611197910100001002003820038200382003820038
10204200371500061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000000071011611197910100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)031f3f4e51inst 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)9fa6a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100242003715001261968625100101010000101000050284752102006620037200371844331876710010201000020100002003720037111002110910101000010000640316221978610000102003820038200382003820038
10024200371500611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000640216221978610000102003820038200382003820038
100242003715001241968625100241010012101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000640216221985410000102003820038200382003820038
100242003715005081968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010000640216221978610000102003820038200382003820038
10024200371500611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000640216221978610000102003820038200862003820038
10024200371500611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000640216221978610000102003820038200382003820038
10024200371500611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000640216221978610000102003820038200382003820038
100242003715001451968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010000640216221978610000102003820038200382003820038
10024200371500611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010010640216221978610000102003820038200382003820038
10024200371490611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010000640216221978610000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  dup v0.4s, v8.s[1]
  dup v1.4s, v8.s[1]
  dup v2.4s, v8.s[1]
  dup v3.4s, v8.s[1]
  dup v4.4s, v8.s[1]
  dup v5.4s, v8.s[1]
  dup v6.4s, v8.s[1]
  dup v7.4s, v8.s[1]
  movi v8.16b, 9

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code divided by count): 0.2506

retire (01)cycle (02)0307080a18191e1f3f51inst 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)9fa8acc5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8020420057150101000015025801081008000810080020500640132020019200382003899776998980120200800322008003220038200381180201100991001008000010000111511851653200350800001002003920039200392003920039
802042003815010100002925801081008000810080020500640132020019200382003899776998980120200800322008003220038200381180201100991001008000010000111511841644200350800001002003920039200392003920039
802042003815010100002925801081008000810080020500640132020019200382003899776998980120200800322008003220038200381180201100991001008000010000111511841665200350800001002003920039200392003920039
802042003815010100005025801081008000810080020500640132020019200382003899776998980120200800322008003220038200381180201100991001008000010000111511841653200350800001002003920039200392003920039
802042003815010100002925801081008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010000111511851655200350800001002003920039200392003920087
802042003815010100002925801081008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010000111511851744200350800001002003920039200392003920039
802042003815010100002925801081008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010003111511841643200350800001002003920039200392003920039
802042003815010100002925801081008000810080020500640132020019200382003899776998980120200800322008003220038200381180201100991001008000010000111511841645200350800001002003920039200392014620039
802042003815010100009625801081008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010000111511851655200350800001002003920039200392003920039
8020420038150101000051525801081008000810080020500640132020019200382003899776998980120200800322008003220038200381180201100991001008000010000111511851665200350800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03191e3f51inst 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)5f60696d6edispatch 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)9fa1a6a8acc2cfd5d6dbddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8002420039150006025800101080000108000050640000002001920038200389996310018800102080000208000020038200381180021109101080000100010050205163352003580000102003920039200392003920039
8002420038150003925800101080000108000050640000002001920038200389996310018800102080000208000020038200381180021109101080000100003050203163352003580000102003920039200392003920039
80024200381500060925800101080000108000050640000002001920038200389996310018800102080000208000020038200381180021109101080000100003050205163532003580000102003920039200392003920039
8002420038150001482580010108000010800005064000000200192003820038999681004580010208000020800002009020038118002110910108000010400518050205163532003580000102003920039200392003920039
8002420038150006225800101080000108000050640000302001920038200381000531001880010208009720800002003820038118002110910108000010231465050205163552003580000102003920039200392003920039
80024200381500014825800101080000108000050640000002001920038200389996310018800102080000208000020038200381180021109101080000100000050205163552003580000102003920039200392003920039
80024200381500051425800101080000108000050640000012001920038200389996310018800102080000208000020038200381180021109101080000100000050205164532003580000102003920039200392003920039
80024200381500014825800101080000108000050640000002001920038200389996310018800102080000208000020038200381180021109101080000100000050203164532003580000102003920039200392003920039
80024200381500039125800101080000108000050640000002001920038200389996310018800102080000208000020038200381180021109101080000100000050205164552003580000102003920039200392003920039
8002420038150008125800101080000108000050640000002001920038200389996310018800102080000208000020038200381180021109101080000100000650205165552003580000102003920039200392008920039