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, 4S)

Test 1: uops

Code:

  movi v0.4s, #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)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
1004288204025100010001000700026928828812331461000100028828811100110000073116112851000289289289289289
1004288304025100010001000700026928828812331461000100028828811100110000073116112851000289289289289289
1004288204025100010001000700026928828812331461000100028828811100110000073116112851000289289289289289
1004288204025100010001000700026928828812331461000100028828811100110000073116112851000289289289289289
1004288204025100010001000700026928828812331461000100028828811100110001073116112851000289289289289289

Test 2: throughput

Count: 8

Code:

  movi v0.4s, #3
  movi v1.4s, #3
  movi v2.4s, #3
  movi v3.4s, #3
  movi v4.4s, #3
  movi v5.4s, #3
  movi v6.4s, #3
  movi v7.4s, #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)0308090b18191e1f3f51inst 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)9fa0a1a6a7a8acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8020420060155000000040258010010080000100800005005600002001902008920241997339996801002008000020020038200381180201100991001008000010000000330511021622200350800001002003920039200392003920039
8020420038155000000040258010010080000100800005005600002001902003820038997339996801002008000020020038200381180201100991001008000010000000600511021622200350800001002003920039200392003920039
80204200381550000000135258010010080000100800005005600002001902003820038997339996801002008000020020038200381180201100991001008000010000000870511021622200350800001002003920039200392003920039
8020420038155000000040258010010080000100800005005600002001902003820038997339996801002008000020020038200381180201100991001008000010000000900511021622200350800001002003920039200392003920039
802042003815500000004025801001008000010080000500560000200190200382003899733999680100200800002002003820038118020110099100100800001000000000511021622200350800001002003920039200392003920039
802042003815500000004025801001008000010080000500560000200190200382003899733999680100200800002002003820038118020110099100100800001000000000511021622200350800001002003920039200742003920039
802042003815500000004025801001008000010080000500560000200190200382003899733999680100200800002002003820038118020110099100100800001000000000511021622200350800001002003920039200392003920039
8020420038155000000040258010010080000100800005005600002001902003820038997339996801002008000020020038200381180201100991001008000010000000900511021622200350800001002003920039200392003920039
8020420038156000000040258010010080000100800005005600002001902003820038997339996801002008000020020038200381180201100991001008000010000000840511021622200350800001002003920039200392003920039
8020420038155000000040258010010080000100800005005600002001902003820038997339996801002008000020020038200381180201100991001008000010000000780511021622200350800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)0318191e1f3f51inst 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)9fa0a1a8acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242004015500003925800101080000108000050560000020019200382003899963100188001020800002020038200381180021109101080000100000950206165520035080000102003920039200392003920039
800242003815600003925800101080000108000050560000120019200382003899963100188001020800002020038200381180021109101080000100000050206166520035080000102003920039200392003920039
800242003815600003925800101080000108000050560000120019200382003899963100188001020800002020038200381180021109101080000100000050206164520035080000102003920039200392003920039
800242003815500006025800101080000108000050560000120019200382003899963100188001020800002020038200381180021109101080000100003050206165420035080000102003920039200392003920039
800242003815500003925800101080000108000050560000120019200382003899963100188001020800002020038200381180021109101080000100000050205165620035080000102003920039200392003920039
800242003815600003925800101080000108000050560000120019200382003899963100188001020800002020038200381180021109101080000100000050206166520035080000102003920039200392003920039
800242003815500003925800101080000108000050560000120019200382003899963100188001020800002020038200381180021109101080000100000050205165520035080000102003920039200392003920039
800242003815600003925800101080000108000050560000120019200382003899963100188001020800002020038200381180021109101080000100000050205167720035080000102003920039200392003920039
800242003815500003925800101080000108000050560000120019200382003899963100188001020800002020038200381180021109101080000100000050207165720035080000102003920039200392003920039
800242003815500003925800101080000108000050560000120019200382003899963100188001020800002020038200381180021109101080000109010050206165620035080000102003920039200392003920039