Apple M1 Microarchitecture Research by Dougall Johnson

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

SHL (vector, 16B)

Test 1: uops

Code:

  shl v0.16b, v0.16b, #3
  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)0308091e3f4e51inst 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)a1a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
100420371500061168625100010001000264521020182037203715713189510001000100020372037111001100000073116111786100020382038203820382038
100420371500061168625100010001000264521120182037203715713189510001000100020372037111001100000073116111786100020382038203820382038
100420371500061168625100010001000264521020182037203715713189510001000100020372037111001100000073116111786100020382038203820382038
100420371500061168625100010001000264521020182037203715713189510001000100020372037111001100000073116111786100020382038203820382038
1004203715000103168625100010001000264521020182037203715713189510001000100020372037111001100000073116111786100020382038203820382038
100420371510361168625100010001000264521120182037203715713189510001000100020372037111001100000073116111786100020382038203820382038
100420371500061168625100010001000264521120182037203715713189510001000100020372037111001100000073116111786100020382038203820382038
100420371500061168625100010001000264521020182037203715713189510001000100020372037111001100000073116111786100020382038203820382038
100420371600061168625100010001000264521020182037203715713189510001000100020372037111001100000073116111786100020382038203820382038
100420371501061168625100010001000264521120182037203715713189510001000100020372037111001100000073116111786100020382038203820382038

Test 2: Latency 1->2

Code:

  shl v0.16b, v0.16b, #3
  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)03191e3f4e51inst 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)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102042003715000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
102042003715000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000067101161119791100001002003820038200382003820038
102042003715000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010001801057101161119791100001002003820038200382003820038
102042003715000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010004007101161119791100001002003820038200382003820038
102042003715000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010007007101161119791100001002003820038200382003820038
10204200371500012031968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010006007101161119791100001002003820038200382003820038
102042003715000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000037101161119791100001002003820038200382003820038
102042003715000611968625101001001000010010000500284752102001820037200371842131874510100200100002001000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
102042003715000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000007101160119791100001002003820038200382003820038
102042003715000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)03191e1f3f4e51inst 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)72scheduler 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)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024200371500006119686251001010100001010000502847521200182003720037184430318767100102010000201000020037200371110021109101010000100000640416221978610000102003820038200382003820038
100242003715009044119686251001010100001010000502847521200182003720037184430318767100102010000201000020037200371110021109101010000100200640216221978610000102003820038200382003820038
10024200371500006119686251001010100001010000502847521200182003720037184430318767100102010000201000020037200371110021109101010000100101805640216521978610000102003820038200382003820038
10024200371500006119686251001010100001010000502847521200182003720037184430318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
10024200371500006119686251001010100001010000502847521200182003720037184430318767100102010000201000020037200371110021109101010000104000640217221978610000102003820038200382003820038
100242003715000044119686251001010100001010000502847521200182003720037184430318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
10024200371500006119686251001010100001010000502847521200182003720037184430318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
10024200371500006119686251001010100001010000502847521200182003720037184430318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
10024200371500006119686251001010100001010000502847521200182003720037184430318767100102010000201000020037200371110021109101010000100000640216221978610000102008520038200382003820038
100242003715000061196862510010101000010100005028475212001820037200371844303187671001020100002010000200372003711100211091010100001003500640216221978610000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  shl v0.16b, v8.16b, #3
  shl v1.16b, v8.16b, #3
  shl v2.16b, v8.16b, #3
  shl v3.16b, v8.16b, #3
  shl v4.16b, v8.16b, #3
  shl v5.16b, v8.16b, #3
  shl v6.16b, v8.16b, #3
  shl v7.16b, v8.16b, #3
  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)03070a0b1e3f51inst 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? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200571501100942580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001000011151181161120035800001002003920039200392003920039
80204200381501100292580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151181161120035800001002003920039200392003920039
80204200381501100292580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001000011151181161120035800001002003920039200392003920039
80204200381501100702580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001001011151181161120035800001002003920039200392003920039
802042003815011005922580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151181161120035800001002003920039200392003920039
80204200381501100292580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151181161120035800001002003920039200392003920039
802042003815011004092580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151181161120035800001002003920039200392003920039
80204200381501100292580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151181161120035800001002003920039200392003920039
80204200381501100292580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000311151181161120035800001002003920106200392003920039
80204200381501100292580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001000011151181161120035800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)0307080a0b18191e1f3a3f51inst 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)9fa0a1a6a8a9acc2cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200501500000000003925800101080000108000050640000020019200382003899963100188001020800002080000200382003811800211091010800001000000005020616292003580000102003920039200392003920039
8002420038150000000000392580010108000010800005064000002001920038200389996310018800102080000208000020038200381180021109101080000100000000502015163152003580000102003920039200392003920039
8002420038150000000000392580010108000010800005064000002001920038200389996310018800102080000208000020038200381180021109101080000100000000502015161562003580000102003920039200392003920039
8002420038150000000000392580010108000010800005064000012001920038200389996310018800102080000208000020038200381180021109101080000100000000502051613152003580000102003920039200392003920039
8002420038150000000000392580010108000010800006064000002001920038200389996310018800102080000208000020038200381180021109101080000100000000502015164152003580000102011020039201112019020039
8002420038150000000000392580010108000010800005064000002001920038200389996310018800102080000208000020038200381180021109101080000100000000502015161242003580000102003920039200392003920039
8002420038150000000000392580010108000010800005064000002001920038200389996310018800102080000208000020038200381180021109101080000100000000502015161552003580000102003920039200392003920039
800242003815000000023100392580090108000010800005064000002001920038200389996310018800102080000208000020038200381180021109101080000100000000502015165102003580000102003920039200392003920039
800242003815000000000039258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110910108000010000000050205165152003580000102003920039200392003920039
800242003814900000015001442580010108000010800005064000002001920038200389996310018800102080000208000020038200381180021109101080000100200000502051615152003580000102003920039200392003920039