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, 8H, lsl)

Test 1: uops

Code:

  mvni v0.8h, #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
10042882040251000100010007000126928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000126928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000126928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000026928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000126928828812331461000100028828811100110000073116112851000289289289289289
10042883040251000100010007000126928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000026928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000126928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000126928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000026928828812331461000100028828811100110000073116112851000289289289289289

Test 2: throughput

Count: 8

Code:

  mvni v0.8h, #3, lsl #8
  mvni v1.8h, #3, lsl #8
  mvni v2.8h, #3, lsl #8
  mvni v3.8h, #3, lsl #8
  mvni v4.8h, #3, lsl #8
  mvni v5.8h, #3, lsl #8
  mvni v6.8h, #3, lsl #8
  mvni v7.8h, #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)03090b18191e1f3f51inst 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
80204200581560000004025801001008000010080000500560000120019200382003899733999680100200800002002003820038118020110099100100800001000000000511021622200350800001002003920039200392003920039
80204200381550000004025801001008000010080000500560000120019200382003899733999680100200800002002003820038118020110099100100800001000000000511021622200350800001002003920039200392003920039
80204200381550000004025801001008000010080000500560000020019200382003899733999680100200800002002003820038118020210099100100800001000000000511021622200350800001002003920039200392003920039
80204200381610000005425801001008000010080000500560000120019200382003899733999680100200800002002003820038118020110099100100800001000000000511021622200350800001002003920039200392003920039
80204200381560000004025801001008000010080000500560000020019200382003899733999680100200800002002003820038118020110099100100800001000000000511021622200350800001002003920039200392003920039
80204200381550000004025801001008000010080000500560000020019200382003899733999680100200800002002003820038118020110099100100800001000000000511021622200350800001002003920039200392003920039
80204200381550000004025801001008000010080000500560000020019200382003899733999680100200800002002003820038118020110099100100800001000001000511021622200350800001002003920039200392003920039
80204200381550000004025801001008000010080000500560000020019200382003899733999680100200800002002003820038518020110099100100800001000000000511021622200350800001002003920039200392003920039
80204200381550000004025801001008000010080000500560000020019200382003899733999680100200800002002003820038118020110099100100800001000000000511021622200350800001002003920039200392003920039
80204200381560000008225801001008000010080000500560000120019200382003899733999680100200800002002003820038118020110099100100800001000000000511021622200350800001002003920039200392003920039

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)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)9fa8accfd2icache miss (d3)d5d6dbddinst fetch restart (de)e0? int output thing (e9)ea? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8002420039155039258001010800001080000505600000200192003820038999631001880010208000020200382003811800211091010800001000502000716066200350080000102003920039200392003920039
80024200381550704258001010800001080000505600000200192003820038999631001880010208000020200382003811800211091010800001003502000516066200350080000102003920039200392003920039
8002420038155039258001010800001080000505600000200192003820038999631001880010208000020200382003811800211091010800001000502000516033200350080000102003920039200392003920039
8002420038156039258001010800001080000505600000200192003820038999631001880010208000020200382003811800211091010800001000502000416058200350080000102003920039200392003920039
80024200381550392580010108000010800005056000002001920038200389996310018800102080000202003820038118002110910108000010005020006160116200350080000102003920039200392003920039
80024200381550392580010108000010800005056000002001920038200389996310018800102080000202003820038118002110910108000010005020006160411200350080000102003920039200392003920039
8002420038155039258001010800001080000505600000200192003820038999631001880010208000020200382003811800211091010800001000502000516066200350080000102003920039200392003920039
8002420038155039258001010800001080000505600000200192003820038999631001880010208000020200382003811800211091010800001000502000516065200350080000102003920039200392003920039
80024200381550392580010108000010800005056000002001920038200389996310018800102080000202003820038118002110910108000010005020005160116200350080000102003920039200392003920039
8002420038155039258001010800001080000505600000200192003820038999631001880010208000020200382003811800211091010800001000502000616066200350080000102003920039200392003920039