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)

Test 1: uops

Code:

  mvni v0.2s, #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)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
10042882040251000100010007000126928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000126928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000126928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000126928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000126928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000126928828812331461000100028828811100110000073116112851000289289289289289
10042882061251000100010007000126928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000126928828812331461000100028828811100110000073116112851000289289289289289
10042883040251000100010007000126928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000026928828812331461000100028828811100110000073116112851000289289289289289

Test 2: throughput

Count: 8

Code:

  mvni v0.2s, #3
  mvni v1.2s, #3
  mvni v2.2s, #3
  mvni v3.2s, #3
  mvni v4.2s, #3
  mvni v5.2s, #3
  mvni v6.2s, #3
  mvni v7.2s, #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)03181e1f3a3f51inst 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)72scheduler 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)9fa0a1a6a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200581610001422580100100800001008000050056000012001902003820038997303999680100200800002002003820038118020110099100100800001000000051125164420035800001002003920039200392003920039
80204200381550001422580100100800001008000050056000012001902003820038997303999680100200800002002003820038118020110099100100800001000000051124164320035800001002003920039200392003920039
80204200381551001422580100100800001008000050056000012001902003820038997303999680100200800002002003820038118020110099100100800001000000051124164420035800001002003920039200392003920039
80204200381550001422580100100800001008000050056000012001902003820038997303999680100200800002002003820038118020110099100100800001000000051283164420035800001002003920039200392003920039
802042003815500017072580100100800001008000050056000012001902003820038997303999680100200800002002003820038118020110099100100800001000000051124164420035800001002003920039200392003920039
802042003815600014225801001008000010080000500560000120019020038200389973039996801002008000020020038200381180201100991001008000010000046651124164320035800001002003920039200392003920039
80204200381550001422580100100800001008000050056000012001902003820038997303999680100200800002002003820038118020110099100100800001000001051124164420035800001002003920039200392003920039
80204200381550001422580100100800001008000050056000012001902003820038997303999680100200800002002003820038118020110099100100800001000000051124164420035800001002003920039200392003920039
802042003815600014225801001008000010080000500560000120019020038200389973039996801002008000020020038200381180201100991001008000010000037351124164320035800001002003920039200392003920039
8020420038155008813462580100100800001008000050056000012001902003820038997303999680100200800002002003820038118020110099100100800001000000051124164320035800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)030b1e3f51inst 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)9fa8accfd0d2d5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200471550181042580010108000010800005056000002001920038200389996310018800102080000202003820038118002110910108000010005020501716652003580000102003920039200392003920039
8002420038155004752580010108000010800005056000002001920038200389996310018800102080000202003820038118002110910108000010005020007161352003580000102003920039200392003920039
8002420038155027392580010108000010800005056000002001920038200389996310018800102080000202003820038118002110910108000010005020007161392003580000102003920039200392003920039
8002420038155024650258001010800001080000505600001200592003820038999631001880010208000020200382003811800211091010800001000502000916952003580000102003920039200392003920039
8002420038155039392580010108000010800005056000002001920038200389996310018800102080000202003820038118002110910108000010005020001016942003580000102003920039200392003920039
800242003815502739258001010800001080000505600000200192003820038999631001880010208000020200382003811800211091010800001000502000916472003580000102003920039200392003920039
800242003815502073925800101080000108000050560000020019200382003899963100188001020800002020038200381180021109101080000100050200013165132003580000102003920039200392003920039
800242003815501539258001010800001080000505600000200192003820038999631001880010208000020200382003811800211091010800001000502000516992003580000102003920039200392003920039
800242003815501239258001010800001080000505600000200192003820038999631001880010208000020200382003811800211091010800001000502000916782003580000102003920039200392003920039
800242003815503339258001010800001080000505600000200192003820038999631001880010208000020200382003811800211091010800001000502000816942003580000102003920039200392003920039