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)

Test 1: uops

Code:

  mvni v0.4h, #3

(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)030b3f51inst 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
10042882040251000100010007000126928828812331461000100028828811100110000073216112851000289289289289289
10042882040251000100010007000126928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000126928828812331461000100028828811100110000073116112851000289289289289289
100428820387251000100011007000026928833712331461000100028828811100110000073116112851000289289289289289
10043272140251000100010007000126928828812331461000100028828811100110001073116112851000289289289289339
10042883040251000100010007000126928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000126928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000126928828812331461000100028828811100110000073116112851000289289289289289
100428820100251000100010007000126928828812331461000100028828811100110001073116112851000289289289289289
10042882040251000100010007000026928828812331461000100028828811100110000073116112851000289289289289289

Test 2: throughput

Count: 8

Code:

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

(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)9fa0a1a6a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200591550000008225801001008000010080000500560000020019200382003899733999680100200800002002003820038118020110099100100800001000003000511021622200350800001002003920039200392003920039
80204200381550000006125801001008000010080000500560000020019200382003899733999680100200800002002003820038118020110099100100800001000000000511021622200350800001002003920039202452003920039
80204200381550000004025801001008000010080000500560000020019200382003899733999680100200800002002003820038118020110099100100800001000000000511021722200350800001002003920039200392003920039
80204200381560000004025801001008000010080000500560000020019200382003899733999680100200800002002003820038118020110099100100800001000000000511021622200350800001002003920039200392003920039
802042003815500000011025801001008000010080000500560000020019200382003899733999680100200800002002003820038118020110099100100800001000000000511021622200350800001002003920039200392003920039
80204200381560000004025801001008000010080000500560000020019200382003899733999680100200800002002003820038118020110099100100800001000001000511021622200350800001002003920039200392003920039
80204200381560000004025801001008000010080000500560000020019200382024299733999680100200800002002003820038118020110099100100800001000000011630511021622200350800001002003920039202472003920039
80204200911550000005425801001008000010080000578560000020019200382003899733999680100200800002002003820038118020110099100100800001000000000511021622200350800001002003920039200392003920039
80204200381560000004025801001008000010080000606560000020019200382003899733999680100200800002002003820038118020110099100100800001000000000511021622200350800001002003920039200392003920039
80204200381550000004025801001008000010080000500560000020019200382003899733999680100200800002002003820038118020110099100100800001000000000511021622200350800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)030b18191e3f51inst 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)9fa6a8accfd0d2d5d6ddinst fetch restart (de)e0? int output thing (e9)eaebec? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8002420040155000039258001010800001080000505600001020019200382003899963100188001020800002020038200381180021109101080000100005020001616715200350150080000102003920039200392023920039
80024200381560000392580010108000010800005056000000200192003820038999631001880010208000020200382003811800211091010800001000050205071617620035000080000102003920039200392003920039
800242003815500003925800101080000108000050560000002001920038200389996310018800102080000202003820038118002110910108000010010502050171661620035000080000102003920039200392003920039
800242003815500003925800101080000108000050560000002001920038200389996310018800102080000202003820038118002110910108000010000502000171671720035000080000102003920039200392003920039
8002420038155000939258001010800001080000505600000520019200382003899963100188001020800002020038200381180021109101080000100005020001716171720035000080000102003920039200392003920039
8002420038155000123925800101080000108000050560000102001920038200389996310018800102080000202003820038118002110910108000010000502000171614720035000080000102003920039200392003920039
80024201391550000392580010108000010800005056000000200192003820038999631001880010208000020200382003811800211091010800001000050200071617720035000080000102003920039200392003920039
8002420038155000039258001010800001080000505600000020019200382003899963100188001020800002020038200381180021109101080000100005020501716171720035000080000102003920039200392003920039
800242003815500003925800101080000108000050560000052001920038200389996310018800102080000202003820038118002110910108000010000502050716171720035000080000102003920039200392003920039
8002420038155000039258001010800001080000505600000020019200382003899963100188001020800002020038200381180021109101080000100018502000171617720035000080000102003920039200392003920039