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, 2S, msl)

Test 1: uops

Code:

  mvni v0.2s, #3, msl #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)696d6edispatch 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
1004288204025100010001000700026928828812331461000100028828811100110000073116112851000289289289289289
1004288204025100010001000700026928828812331461000100028828811100110000073116112851000289289289289289
1004288204025100010001000700026928828812331461000100028828811100110000073116112851000289289289289289
1004288204025100010001000700026928828812331461000100028828811100110000073116112851000289289289289289
1004288204025100010001000700026928828812331461000100028828811100110000073116112851000289289289289289
1004288264025100010001000700026928828812331461000100028828811100110000073116112851000289289289289289
1004288204025100010001000700026928828812331461000100028828811100110000073116112851000289289289289289
1004288204025100010001000700026928828812331461000100028828811100110000073116112851000289289289289289
1004288208225100010001000700026928828812331461000100028828811100110000073116112851000289289289289289
1004288204025100010001000700026928828812331461000100028828811100110000073116112851000289289289289289

Test 2: throughput

Count: 8

Code:

  mvni v0.2s, #3, msl #8
  mvni v1.2s, #3, msl #8
  mvni v2.2s, #3, msl #8
  mvni v3.2s, #3, msl #8
  mvni v4.2s, #3, msl #8
  mvni v5.2s, #3, msl #8
  mvni v6.2s, #3, msl #8
  mvni v7.2s, #3, msl #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)0307080b18191e1f3a3f51inst 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)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)9fa6a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200381550000000059125801001008000010080000500560000200192003820038997339996801002008000020020038200381180201100991001008000010000000511031622200350800001002003920039200392003920039
80204200381550000000081125801001008000010080000500560000200192003820038997339996801002008000020020038200381180201100991001008000010000000511021622200350800001002003920039200392003920039
80204200381560000000040258010010080084100800005005600002001920038200389973399968010020080000200200382003811802011009910010080000100020000511021622200350800001002003920039200392003920039
80204200381550000000016825801001008000010080000500560000200192003820038997339996801002008000020020038200381180201100991001008000010000000511021622200350800001002003920039200392003920039
80204200381550000000010525801001008000010080000500560000200192003820038997339996801002008000020020038200381180201100991001008000010001000511021622200350800001002003920039200392003920039
80204200381550000000055258010010080000100800005005600002001920038200389973610022801002008000020020038200381180201100991001008000010000000512721612200350800001002003920039200392003920039
8020420038155000001321080402580100100800001008000050056000020019200382003899823100218010020080000200200382003811802011009910010080000100000005110335252019321800001002034320246202412029320194
802042034315801054663440020491228068512180000121804885865640562021520293202911002325101548070520280199200203442029171802011009910010080000100010235545189271232023720800001002030020298203022028720296
802042029915700056672440021041418059512280468118800995955633752025220292202911002627101328070920080486202202852029161802011009910010080000100202281005195280222023821800001002034620398203032034520393
8020420356156310661044616219601598068011580466126805925965641082010320396204001004034101528070520080298200203982039071802011009910010080000100052304095209432442028222800001002018920292201912028920194

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)5f60696d6edispatch 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)9fa7a8accdcfd5d6ddinst fetch restart (de)e0eaebec? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8002420040155039258001010800001080000505600000020019200382003899963100188001020800002020038200381180021109101080000100066050208161762003500080000102003920039200392003920039
8002420038155039258001010800001080000505600000020019200382003899963100188001020800002020038200381180021109101080000100084050207168172003500080000102003920039200392003920039
80024200381550392580010108000010800005056000000200192003820038999631001880010208000020200382003811800211091010800001000750502017161782003500080000102003920039200392003920039
80024200381550109258001010800001080000505600000020019200382003899963100188001020800002020038200381180021109101080000100072050205165172003500080000102003920039200392003920039
8002420038155067258001010800001080000505600000120019200382003899963100188001020800002020038200381180021109101080000100090050207161782003500080000102003920039200392003920039
80024200381560392580010108000010800005656000000200192003820038999631001880010208000020200382003811800211091010800001000960502016161682003500080000102003920039200392003920039
800242003816103925800101080000108000050560000002001920038200389996310018800102080000202003820038118002110910108000010008105020171614172003500080000102003920039200392003920039
8002420038155039258001010800001080000505600000120019200382003899963100188001020800002020038200381180021109101080000100060502017161672003500080000102003920039200392003920039
800242003815503925800101080000108000050560000002001920038200389996310018800102080000202003820038118002110910108000010008105020171616172003500080000102003920039200392003920039
8002420038156039258001010800001080000505600000020019200382003899963100188001020800002020038200381180021109101080000100030502016161662003500080000102003920039200392003920039