Apple M1 Microarchitecture Research by Dougall Johnson

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

FNEG (vector, 4S)

Test 1: uops

Code:

  fneg v0.4s, v0.4s
  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)dfe0? fp/simd (ee)f5f6f7f8fd
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000752161121786100020382038203820382038
1004203715025116862510001000100026452112018203720371571318951000100010002037203711100110000751161121786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000751161121786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000751162121786100020382038203820382038
100420371636116862510001000100026452112018203720371571318951000100010002037203711100110000751161121786100020382038203820382038
1004203715426116862510001000100026452112018203720371571318951000100010002037203711100110000751161121786100020382038203820382038
100420371608216862510001000100026452112018203720371571318951000100010002037203711100110000751161121786100020382038203820382038
1004203715576116862510001000100026452112018203720371571318951000100010002037203711100110000751161121786100020382038203820382038
100420371606116862510001000100026452112018203720371571318951000100010002037203711100110000751161121786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000751161121786100020382038203820382038

Test 2: Latency 1->2

Code:

  fneg v0.4s, v0.4s
  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)9fa8acc2cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204200371500147196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000007102161119791100001002003820038200382003820038
1020420037150061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000027101161119791100001002003820038200382003820038
1020420037150061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
1020420037150061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
10204200371500170196862510100100100001001000050028475210200182003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
10204200371490149196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
1020420037150084196862510100100100001001000050028475210200182003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
1020420037150061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
1020420037150061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
10204200371500124196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)03080b18191e1f3a3f4e51inst 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)9fa0a1a6a7a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024200371500000000158196862510010101000012100005028475212001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
10024200371500000000149196862510010101000010100005028475212001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
1002420037150000000061196862510010101000010100005028475212001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
1002420084150000000061196862510010101000010100005028475212001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
1002420037150000000061196862510010101000010100005028475212001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
1002420037150000000061196862510010101000010100005028475212001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
1002420037150000000061196862510010101000010100005028475212001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
1002420037150000000061196862510010101000010100005028475212001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
1002420037150000000061196862510010101000010100005028475212001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
1002420037149000000061196862510010101000010100005028475212001820037200371844331876710010201000020100002003720037111002110910101000010000000006402163319786010000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  fneg v0.4s, v8.4s
  fneg v1.4s, v8.4s
  fneg v2.4s, v8.4s
  fneg v3.4s, v8.4s
  fneg v4.4s, v8.4s
  fneg v5.4s, v8.4s
  fneg v6.4s, v8.4s
  fneg v7.4s, v8.4s
  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)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)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)9fc5branch mispredict (cb)cdcfd6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200591500292580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001001115118161120035800001002003920039200392003920039
80204200381500292580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001001115118160020035800001002003920039200392003920039
80204200381500292580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001001115118160020035800001002003920039200392003920039
80204200381500292580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001001115118160020035800001002003920039200392003920039
80204200381500292580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001001115118161120035800001002003920039200392003920039
80204200381500292580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001001115118160020035800001002003920039200392003920039
80204200381500292580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001001115118160020035800001002003920039200392003920039
80204200381500292580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001001115118160020035800001002003920039200392003920039
80204200381500292580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001001115118160020035800001002003920039200392003920039
802042003815001242580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001001115118161120035800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03071e3f51inst 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)9fa8acc2cfd0d5d6dadbddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200511500032625800101080000108000050640000020019020038200389996310018800102080000208000020038200881180021109101080000100645037021630122003580000102003920039200392003920039
80024200381501031325800101080000108000050640000020019020038200389996310018800102080000208000020038200381180021109101080000100005020011600112003580000102003920039200392003920039
80024200381501123925800101080000108000050640000020019020038200389996310018800102080000208000020038200381180021109101080000100005020011600112003580000102003920039200392003920039
8002420038150008125800101080000108000050640000020019020038200389996310018800102080000208000020038200381180021109101080000100005020011600312003580000102003920039200392003920039
80024200381500028325801031080000108000050640000020019020038200389996310018800102080000208000020038200381180021109101080000100005020031600212015080000102003920039200392003920039
8002420038150006225800101080000108000050640000020019020038200389996310018800102080000208000020038200381180021109101080000100005020011600122003580000102003920039200392003920039
8002420038150003925800101080000108000050640000020019020038200389996310018800102080000208000020038200381180021109101080000100005020011600212003580000102003920039200392003920039
8002420038150003925800101080000108000050640000020019020038200389996310018800102080000208000020038200381180021109101080000100005020011610112003580000102003920039200392003920039
80024200381501023225800101080000108000050640000020019020038200389996310018800102080000208000020038200381180021109101080000100005020011600112003580000102003920039200392003920039
8002420038150006025800101080000108000050640000020019020038200389996310018800102080000208000020038200381180021109101080000100005020411600112003580000102003920039200392003920039