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, 8H)

Test 1: uops

Code:

  movi v0.8h, #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)03081e3f51inst 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)a6a8a9accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
10042882004025100010001000700002692882881233146100010002882881110011000050073316112851000289289289289289
10042882004025100010001000700002692882881233146100010002882881110011000030073116112851000289289289289289
10042882004025100010001000700002692882881233146100010002882881110011000000073116112851000289289289289289
10042882004025100010001000700002692882881233146100010002882881110011000000093120112851000289289289289289
10042883001052510931000100070000269288338123314610001096288288111001100030222073116113231000289289289289289
100428820023825100010001000700002692883371333146100010002902881110011000000073116112851000289289289289289
10042883004025100010001000700002692882881233146100010002882881110011000000073116112851000289289289289289
10042882004025100010001000700002692882881233146100010002882881110011000000073116112851000289289289289289
10042882004025100010001000700002692882881233146100010002882881110011000000073116112851000289289289289289
100428820214025100010001000700002692882881233146100010002882881110011000000073116112851000289289289289289

Test 2: throughput

Count: 8

Code:

  movi v0.8h, #3
  movi v1.8h, #3
  movi v2.8h, #3
  movi v3.8h, #3
  movi v4.8h, #3
  movi v5.8h, #3
  movi v6.8h, #3
  movi v7.8h, #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)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)5e60696d6edispatch 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)9fa0a1a8acmemory order violation (c4)branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0eb? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8020420058155045258010010080000100800005005600000020019200382003899733999680100200800002002003820038118020110099100100800001000000000511021622200350800001002003920039200392003920039
8020420038155055258010010080000100800005005600000020019200382003899733999680100200800002002003820038118020110099100100800001000000000511021622200350800001002003920039200392003920039
80204200381550150258010010080000100800005005600000020019200382003899733999680100200800002002003820038118020110099100100800001000000000511021622200350800001002003920039200392003920039
8020420038155042258010010080000100800005005600000020019200382003899733999680100200800002002003820038118020110099100100800001000010000511021622200350800001002003920039200392003920039
80204200381551771118258010010080000100800005005600000020019200382003899733999680100200800002002003820038118020110099100100800001000000000511021622200350800001002003920039200392003920039
80204200381550705258010010080000100800005005600000020019200382003899733999680100200800002002003820038118020110099100100800001000000000511021622200350800001002003920039200392003920039
80204200381551242258010010080000100800005005600000020019200382003899733999680100200800002002003820038118020110099100100800001000000000511021622200350800001002003920039200392003920039
8020420038155042258010010080000100800005005600000020019200382003899733999680100200800002002003820038118020110099100100800001000000000511021622200350800001002003920039200392003920039
8020420038155042258010010080000100800005005600000020019200382003899733999680100200800002002003820038118020110099100100800001000000000511021622200350800001002003920039200392003920039
8020420038155040258010010080000100800005005600000020019200382003899733999680100200800002002003820038118020110099100100800001000000000511021622200350800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03181e3f51inst 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)9fa8a9acc2c5cfd0d5d6ddinst fetch restart (de)e0? int output thing (e9)eaeb? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200471550039258001010800001080000505600000200192003820038999631001880010208000020200382003811800211091010800001000000502001161120035001480000102003920039200392003920039
8002420038155003925800101080000108000050560000020019200382003899963100188001020800002020038200381180021109101080000100030050200116112003500080000102003920039200392003920039
8002420038155003925800101080000108000050560000020019200382003899963100188001020800002020038200381180021109101080000103090050200116112003500080000102003920039200392003920039
8002420038156003925800101080000108000050560000020019200382003899963100188001020800002020038200381180021109101080000100004050200116112003500080000102003920039200392003920039
80024200381550153925800101080000108000050560000020019200382003899963100188001020800002020038200381180021109101080000100000050200116112003500080000102003920039200392003920039
80024200381550037525800101080000108000050560000020019200382003899963100188001020800002020038200381180021109101080000100090050200116112003500080000102003920039200392003920039
8002420038155003925800101080000108000050560000020019200382003899963100188001020800002020038200381180021109101080000100000050200116112003500080000102003920039200392003920039
80024200381550039258001010800001080000505600000200192003820038999631001880010208000020200382003811800211091010800001004120050200116112003500080000102003920039200392003920039
80024200381550062258001010800001080000505601840200192003820038999631001880010208000020200382003811800211091010800001050000502001161120035001480000102003920039200392003920039
8002420038156003925800101080000108000050560000020019200382003899963100188001020800002020038200381180021109101080000100000050200116112003500080000102003920039200392003920039