Apple M1 Microarchitecture Research by Dougall Johnson

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

MOVI (vector, 64-bit, D)

Test 1: uops

Code:

  movi d0, #0xff00

(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
10042882040251000100010007000026928828812331461000100028828811100110000073216222851000289289289289289
10042882040251000100010007000026928828812331461000100028828811100110000073216222851000289289289289289
10042882040251000100010007000026928828812331461000100028828811100110000073216222851000289289289289289
10042882061251000100010007000026928828812331461000100028828811100110000073216222851000289289289289289
10042882040251000100010007000026928828812331461000100028828811100110000373216222851000289289289289289
10042882040251000100010007000026928828812331461000100028828811100110000073216222851000289289289289289
10042882040251000100010007000026928828812331461000100028828811100110000073216222851000289289289289289
10042883040251000100010007000026928828812331461000100028828811100110000073216222851000289289289289289
10042882040251000100010007000026928828812331461000100028828811100110000073216222851000289289289289289
100428821240251000100010007000026928828812331461000100028828811100110000073216222851000289289289289289

Test 2: throughput

Count: 8

Code:

  movi d0, #0xff00
  movi d1, #0xff00
  movi d2, #0xff00
  movi d3, #0xff00
  movi d4, #0xff00
  movi d5, #0xff00
  movi d6, #0xff00
  movi d7, #0xff00

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

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

retire (01)cycle (02)03090b18191e1f3a3f51inst 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)9fa8acc5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8020420058155000000029258010810080008100800205005601280200192003820038997769989801202008003220020038200381180201100991001008000010000111511801600200350800001002003920039200392003920039
8020420038155000000029258010810080008100800205005601281200192003820038997739996801002008000020020038200381180201100991001008000010000000511021622200350800001002003920039200392003920039
8020420038155000000040258010010080000100800005005600000200192003820038997339996801002008000020020038200381180201100991001008000010000000511021622200350800001002003920039200392003920039
8020420038155000000040258010010080000100800005005600000200192003820038997339996801002008000020020038200381180201100991001008000010000000511021622200350800001002003920039200392003920039
8020420038155000000040258010010080000100800005005600001200192003820038997339996801002008000020020038200381180201100991001008000010000000511021622200350800001002003920039200392003920039
8020420038155000000040258010010080000100800005005600001200192003820038997339996801002008000020020038200381180201100991001008000010000000511021622200350800001002003920039200392003920039
8020420038155000000040258010010080000100800005005600000200192003820038997339996801002008000020020038200381180201100991001008000010000000511021622200350800001002003920039200392003920039
8020420038156000000040258010010080000100800005005600001200192003820038997339996801002008000020020038200381180201100991001008000010000000511021622200350800001002003920039200392003920039
8020420038156000000040258010010080000100800005005600001200192003820038997339996802152008000020020038200381180201100991001008000010000000511021622200350800001002003920039200392003920039
8020420038155000000040258010010080000100800005005600001200192003820038997339996801002008000020020038200381180201100991001008000010000000511021622200350800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03191e3a3f51inst 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)696b6d6edispatch 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)9fa0a8cficache miss (d3)d5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200391550003925800101080000108000050560000200190200382003899963100188001220800002020038200381180021109101080000100050201116112003580000102003920039200392003920039
80024200381550003925800101080000108000050560000200190200382003899963100188001020800002020038200381180021109101080000100050200116112003580000102003920039200392003920039
80024200381550003925800101080000108000050560000200190200382003899963100188001020800002020038200381180021109101080000100050200116112003580000102003920039200392003920039
80024200381560003925800101080000108000050560000200190200382003899963100188001020800002020038200381180021109101080000100050200116112003580000102003920039200392003920039
80024200381550003925800101080000108000050560000200190200382003899963100188001020800002020038200381180021109101080000100050200116112003580000102003920039200392003920039
80024200381550003925800101080000108000050560000200190200382003899963100188001020800002020038200381180021109101080000100050200116112003580000102003920039200392003920039
80024200381550003925800101080000108000050560000200190200382003899963100188001020800002020038200381180021109101080000100050200116112003580000102003920039200392003920039
800242003815600051425800101080000108000050560000200190200382003899963100188001020800002020038200381180021109101080000100050200116112003580000102003920039200392003920039
80024200381550003925800101080000108000050560000200190200382003899963100188001020800002020038200381180021109101080000100050200116112003580000102003920039200392003920039
80024200381550003925800101080000108000050560000200190200382003899963100188001020800002020038200381180021109101080000100050200116112003580000102003920039200392008820039