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, 16B)

Test 1: uops

Code:

  dup v0.16b, v0.b[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)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
100420371506116862510001000100026452102018203720371571318951000100010002037203711100110000073216221786100020382038203820382038
100420371506116862510001000100026452102018203720371571318951000100010002037203711100110000073216221786100020382038203820382038
1004203715061168625100010001000264521020182037203715713189510001000100020372037111001100012073216221786100020382038203820382038
100420371506116862510001000100026452102018203720371571318951000100010002037203711100110000073216221786100020382038203820382038
1004203715010316862510001000100026452102018203720371571318951000100010002037203711100110000073216221786100020852085203820382038
1004203715061168625100010001000264521020182037203715713189510001000100020372037111001100008773216221786100020382038203820382038
100420371506116862510001000100026452102018203720371571318951000100010002037203711100110000073216221786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000073216221786100020382038203820382038
1004203715246116862510001000100026452102018203720371571318951000100010002037203711100110000973216221786100020382038203820382038
100420371506116862510001000100026452102018203720371571318951000100010002037203711100110000073216221786100020382038203820382038

Test 2: Latency 1->2

Code:

  dup v0.16b, v0.b[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)0307080b1e3f4e51inst 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)9fa1accfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204200371500110124196862510100100100001001000050028475212001820037200861842431874510125200100002001000020037200371110201100991001001000010002020710116111979125100001002003820038200382003820038
102042003715000006119686251010010010000100100005002847521200182003720037184213187451010020010000200100002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
102042003715000006119686251010010010000100100005002847521200182003720037184213187451012520010000200100002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
102042003715000006119686251010010010000100100005002847521200182003720037184213187451010020010000200100002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
102042003715000006119686251010010010000100100005002847521200182003720037184213187451010020010000200100002003720037111020110099100100100001000071211611197910100001002003820038200382003820038
102042003715000006119686251010010010000100100005002847521200182003720037184213187451010020010000200100002003720037111020110099100100100001000071021611197910100001002003820038200382003820038
102042003715000006119686251010010010000100100005002847521200182003720037184213187451010020010000200100002003720037111020110099100100100001000071011711197910100001002003820038200382003820038
102042003715000006119686251010010010000100100005002847521200182003720037184213187451010020010000200100002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
1020420037150000014519686251010010010000100100005002847521200182003720037184213187451010020010000200100002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
102042003715000006119686251010010010000100100005002847521200182003720037184213187451010020010000200100002003720037111020110099100100100001000071011611197910100001002003820038200382003820038

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)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)9fa8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100242003715006119686251001010100001010000502847521200182003720037184433187671001020100002010000200372003711100211091010100001000640216431978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521200182003720037184433187671001020100002010000200372003711100211091010100001080640416431978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521200182003720037184433187671001020100002010000200372003711100211091010100001000640416341978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521200182003720037184433187671001020100002010000200372003711100211091010100001000640416341978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521200182003720037184433187671001020100002010000200372003711100211091010100001000640316341978610000102003820038200382003820038
10024200371501893519686251001010100001010000502847521200182003720037184433187671001020100002010000200372003711100211091010100001000640316341978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521200182003720037184433187791001020100002010000200372003711100211091010100001000640416431978610000102003820038200382003820038
1002420037150072619686251001010100001010000502847521200182003720037184433187671001020100002010000200372003711100211091010100001013640316431978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521200182003720037184433187671001020100002010000200372003711100211091010100001000640416441978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521200182003720037184433187671001020100002010000200372003711100211091010100001000640417341978610000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  dup v0.16b, v8.b[1]
  dup v1.16b, v8.b[1]
  dup v2.16b, v8.b[1]
  dup v3.16b, v8.b[1]
  dup v4.16b, v8.b[1]
  dup v5.16b, v8.b[1]
  dup v6.16b, v8.b[1]
  dup v7.16b, v8.b[1]
  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)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)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)9fa8acc5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8020420060150102925801081028000810080020500640132020019020038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020035800001002003920039200392003920039
80204200381500021925801081008000810080020500640132120019020038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020035800001002003920039200392003920039
80204200381500127125801081008000810080020500640132020019020038200389977699898012020080032200801362003820038118020110099100100800001000011151180160020035800001002003920039200392003920039
802042003815001211325801081008000810080020500640132020019020038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020035800001002003920039200392003920039
8020420090150002925801081008000810080020500640132020019020038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020035800001002003920039200392003920039
8020420038150002925801081008000810080020500640756020019020038200389977699898012020080032200800322003820038118020110099100100800001000011151180163120035800001002003920039200392003920039
80204200381500050425801081008000810080020500640132020019020038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020035800001002003920039200392003920039
8020420038150002925801081008000810080020500640132020019020038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020035800001002003920039200392003920039
80204200381500011325801081008000810080020500640132020019020038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020035800001002003920039200392003920039
8020420038150002925801081008000810080020500640132020019020038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020035800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)031e1f3f51inst 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)9fa8acc2cdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8002420050150003925800101080000108000050640000020019200382003899963100188001020800002080000200382003811800211091010800001000005020416422003580000102003920039200392003920039
8002420038155003925800101080000108000050640000120019200382003899963100188001020800002080000200382003811800211091010800001000005020416422003580000102003920039200392003920039
8002420038150003925800101080000108000050640000020019200382003899963100188001020800002080000200382003811800211091010800001000005020216242003580000102003920039200392003920039
8002420038150003925800101080000108000050640000020019200992003899963100188001020800002080000200382003811800211091010800001000005020216432003580000102003920039200392003920039
8002420038150003925800101080000108000050640000020019200382003899963100188001020800002080000200382003811800211091010800001000005020416342003580000102003920039200392003920039
8002420038150003925800101080000108000050640000020019200382003899963100188001020800002080000200382003811800211091010800001000005020216242003580000102003920039200392003920039
80024200381500051425800101080000108000050640000120019200382003899963100188001020800002080000200382003811800211091010800001000005020416242003580000102003920039200392003920039
8002420038150003925800101080000108000050640000020019200382003899963100188001020800002080000200382003811800211091010800001000005020416242003580000102003920039200392003920039
8002420038150003925800101080000108000050640000120019200382003899963100188001020800002080000200382003811800211091010800001000015020416242003580000102003920039200392003920039
8002420038150006025800101080000108000050640000020019200382003899963100188001020800002080000200382003811800211091010800001000005020416442003580000102003920039200392003920039