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, 2S)

Test 1: uops

Code:

  fneg v0.2s, v0.2s
  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)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)a6accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
10042037150611686251000100010002645212018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
10042037150611686251000100010002645212018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
10042037150611686251000100010002645212018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
100420371505341686251000100010002645212018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
10042037150611686251000100010002645212018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
10042037150611686251000100010002645212018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
10042037150821686251000100010002645212018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
10042037150611686251000100010002645212018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
10042037150611686251000100010002645212018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
10042037150611686251000100010002645212018203720371571318951000100010002037203711100110000073116111786100020382038203820382038

Test 2: Latency 1->2

Code:

  fneg v0.2s, v0.2s
  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)033a3f4e51inst 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)9fa8acc5cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204200371500611968625101001001000010010000500284752112001802003720037184213187451010020010000200100002003720037111020110099100100100001003007101161119791100001002003820038200382003820038
102042003715006119686251010010010000100100005002847521120018020037200371842131874510100200100002001000020037200371110201100991001001000010022307101161119791100001002003820038200382003820038
102042003715001241968625101001001000010010000500284752112001802003720037184213187451010020010000200100002003720037111020110099100100100001000007341161119791100001002003820038200382003820038
10204200371500611968625101001001000010010000500284752112001802003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
10204200371500611968625101001001000010010000500284752112001802003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
102042003715012771968625101001001000010010000500284752112001802003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
102042003715006119686251010010010000100100005002847521120018020037200371842131874510100200100002001000020037200371110201100991001001000010054307101161119791100001002003820038200382003820038
10204200371500841968625101001001000010010000500284752112001802003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
10204200371500821968625101001001000010010000500284752112001802003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
10204200371500841968625101001001000010010000500284752112001802003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038

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)9fa8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024200371500214196862510010101000010100005028475210200182003720037184433187671001020100002010000200372003711100211091010100001000640316221978610000102003820038200382003820038
10024200371500369196862510010101000010100005028475210200182003720037184433187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
1002420037150061196862510010101000010100005028475210200182003720037184433187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
1002420037150061196862510010101004810100005028475210200182003720037184433187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
1002420037150061196862510010101000010100005028475210200182003720037184433187671001020100002010000200372003711100211091010100001000669216221978610000102003820038200382003820038
10024200371500438196862510010101000010100005028475211200182003720037184433187671001020100002010000200372003711100211091010100001010640216221978610000102003820038200382003820038
1002420037150010319686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000103715640216221978610000102003820038200382003820038
1002420037150061196862510010101000010100005028475210200182003720037184433187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
10024200371500103196862510010101000010100005028475210200182003720037184433187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
10024200371500147196862510010101000010100005028475210200182003720037184433187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  fneg v0.2s, v8.2s
  fneg v1.2s, v8.2s
  fneg v2.2s, v8.2s
  fneg v3.2s, v8.2s
  fneg v4.2s, v8.2s
  fneg v5.2s, v8.2s
  fneg v6.2s, v8.2s
  fneg v7.2s, v8.2s
  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)03080b18191e3f51inst 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)9fa8a9acc5branch mispredict (cb)cdcfd5d6inst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8020420059150000001362580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000001115118116120035800001002003920039200392003920039
8020420038150000002032580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000001115118016020035800001002003920039200392003920039
8020420038150000001172580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001001001115118016020035800001002003920039200392003920039
802042003815000000502580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000001115118016020035800001002003920039200392003920039
8020420038150000003212580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000001115118016020035800001002003920039200392003920039
802042003815000000292580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001000001115118016020035800001002003920039200392003920039
802042003815000000292580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001000001115118016120035800001002003920039200392003920039
802042003815000000292580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001000001115118016120035800001002003920039200392003920039
802042003815000000292580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001000001115118016020035800001002003920039200392003920039
8020420038150000005002580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001000001115118016120035800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)033f51inst 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)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)9fa0a8a9acc2cfd0d2d5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242005015039258001010800001080000506400000020019200382003899963100188001020800002080000200382003811800211091010800001000030502000116112008780000102003920039200392003920039
800242003815039258001010800001080390506400001020019200382003899963100188001020800002080000200382003811800211091010800001000000502054116122003580000102003920039200392003920039
800242003815039258001010800001080000506400000020019200382003899963100188001020800002080000200382003811800211091010800001000000502000116132003580000102003920039200392003920039
8002420038150209258001010800001080000506400000520019200382003899963100188001020800002080000200382003811800211091010800001000000502054116112003580000102003920039200392003920039
800242003815060258001010800001080000506400001020019200382003899963100188001020800002080000200382003811800211091010800001002000502000116142003580000102003920039200392003920039
800242003815039258001010800001080000506400000520019200382003899963100188001020800002080000200382003811800211091010800001000000502054116112003580000102003920039200392003920039
8002420038150150258001010800001080000506400000020019200382003899963100188001020800002080000200382003811800211091010800001001000502000116432003580000102003920039200392003920039
800242003815062258001010800001080000506400000020019200382003899963100188001020800002080132200382034411800211091010800001000000502054116122003580000102003920039200872003920039
800242003815081258001010800001080000506400001520019200382003899963100188001020800002080000200382003811800211091010800001000000502000116122003580000102003920039200392003920039
800242003815060258001010800001080000506400001520019200382003899963100188001020800002080000200382003811800211091010800001001000502000116122003580000102003920039200392003920039