Apple M1 Microarchitecture Research by Dougall Johnson

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

MVNI (vector, 4H, lsl)

Test 1: uops

Code:

  mvni v0.4h, #3, lsl #8

(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)031e3f51inst 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)8283pipeline redirect (84)85inst all (8c)inst neon or fp (9a)a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
10042882040251000100010007000126928828812331461000100028828811100110001073116112851000289289289289289
10042882940251000100010007000026928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000026928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000026928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000026928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000026928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000026928828812331461000100028828811100110000373116112851000289289289289289
10042882040251000100010007000026928828812331461000100028828811100110000073116112851000289289289289289
10042883040251000100010007000026928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000026928828812331461000100028828811100110000073116112851000289289289289289

Test 2: throughput

Count: 8

Code:

  mvni v0.4h, #3, lsl #8
  mvni v1.4h, #3, lsl #8
  mvni v2.4h, #3, lsl #8
  mvni v3.4h, #3, lsl #8
  mvni v4.4h, #3, lsl #8
  mvni v5.4h, #3, lsl #8
  mvni v6.4h, #3, lsl #8
  mvni v7.4h, #3, lsl #8

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

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

retire (01)cycle (02)03080b18191e1f3f51inst 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)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)9fa0a6a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200601550000001262580100100800001008000050056000012001920038200389973399968010020080000200200382003811802011009910010080000100000000511021622200350800001002003920039200392003920039
8020420038155000090402580100100800001008000050056000002001920038200389973399968010020080000200200382003811802011009910010080000100000000511021622200350800001002003920039200392003920039
8020420038155000000402580100100800001008000050056000002001920038200389973399968010020080000200200382003811802011009910010080000100000000511021622200350800001002003920039200392003920039
8020420038155000000402580100100800001008000050056000002001920038200389973399968010020080000200200382003811802011009910010080000100000000511021622200350800001002003920039200392003920039
80204200381550000001052580100100800001008000050056000002001920038200389973399968010020080000200200382003811802011009910010080000100000000511021622200350800001002003920039200392003920039
80204200381550000001032580100100800001008000050056000012001920038200389973399968010020080000200200382003811802011009910010080000100000000511021622200350800001002003920039200392003920039
8020420038156000000402580100100800001008000050056000002001920038200389973399968010020080000200200382003811802011009910010080000100000000511021622200350800001002003920039200392003920039
8020420038156000030682580100100800001008000050056000002001920038200389973399968010020080000200200382003811802011009910010080000100000000511021622200350800001002003920039200392003920039
8020420038155000000432580100100800001008000050056000002001920038200389973399968010020080000200200382003811802011009910010080000100000000511021622200350800001002003920039200392003920039
8020420038155000000452580100100800001008000050056000002001920038200389973399968010020080000200200382003811802011009910010080000100000030511011622200350800001002003920039200392003920039

1000 unrolls and 10 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)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)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
8002420048155041425800101080000108000050560000052001920038200389996310018800102080000202003820038118002110910108000010105020516662003580000102003920039200392003920039
8002420038155024325800101080000108000050560000152001920038200389996310018800102080000202003820038118002110910108000010105020616662003580000102003920039200392003920039
800242003815506025800101080000108000050560000002001920038200389996310018800102080000202003820038118002110910108000010005020716782003580000102003920039200392003920039
8002420038155026725800101080000108000050560000002001920038200389996310018800102080000202003820038118002110910108000010105020616782003580000102003920039200392003920039
8002420038155123925800101080000108000050560000102001920038200389996310018800102080000202003820038118002110910108000010105020616662003580000102003920039200392003920039
8002420038156123925800101080000108000050560000102001920038200389996310018800102080000202003820038118002110910108000010005020616772003580000102003920039200392003920039
80024200381551226725800101080000108000050560000102001920038200389996310018800102080000202003820038118002110910108000010005020616672003580000102003920039200392003920039
8002420038155017125800101080000108000050560000102001920038200389996310018800102080000202003820038118002110910108000010005020616782003580000102003920039200392003920039
8002420038155010625800101080000108000050560000102001920038200389996310018800102080000202003820038118002110910108000010005020716872003580000102003920039200392003920039
800242003815603925800101080000108000050560000102001920038200389996310018800102080000202003820038118002110910108000010105020716782003580000102003920039200392003920039