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, 2S)

Test 1: uops

Code:

  movi 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)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)accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
100428830402510001000100070002692882881233146100010002882881110011000973116112851000289289289289289
100428820402510001000100070002692882881233146100010002882881110011000073116112851000289289289289289
100428820402510001000100070002692882881233146100010002882881110011000073116112851000289289289289289
100428820402510001000100070002692882881233146100010002882881110011000073116112851000289289289289289
100428820402510001000100070002692882881233146100010002882881110011000373116112851000289289289289289
100428820402510001000100070002692882881233146100010002882881110011000073116112851000289289289289289
100428820402510001000100070002692882881233146100010002882881110011000073116112851000289289289289289
100428820402510001000100070002692882881233146100010002882881110011000073116112851000289289289289289
100428820402510001000100070002692882881233146100010002882881110011000073116112851000289289289289289
100428820402510001000100070002692882881233146100010002882881110011000073116112851000289289289289289

Test 2: throughput

Count: 8

Code:

  movi v0.2s, #3
  movi v1.2s, #3
  movi v2.2s, #3
  movi v3.2s, #3
  movi v4.2s, #3
  movi v5.2s, #3
  movi v6.2s, #3
  movi 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)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)9fa0a1a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
802042003815012402580100100800001008000050056000002001920038200389973399968010020080000200200382003811802011009910010080000100000051102162220035800001002003920039200392003920039
802042003815012402580100100800001008000050056000002001920038200389973399968010020080000200200382003811802011009910010080000100000051102162220035800001002003920039200392003920039
8020420038150040258010010080000100800005005600000200192003820038997339996801002008000020020038200381180201100991001008000010000020151102162220035800001002003920039200392003920039
80204200381500612580100100800001008000050056000002001920038200389973399968010020080000200200382003811802011009910010080000100000051102162220035800001002003920039200392003920039
80204200381500402580100100800001008000050056000002001920038200389973399968010020080000200200382003811802011009910010080000100001051102162220035800001002003920039200392003920039
80204200381500402580100100800001008000050056000002001920038200389973399968010020080000200200382003811802011009910010080000100000051102162220035800001002003920039200392003920039
80204200381500402580100100800001008000050056000012001920038200389973399968010020080000200200382003811802011009910010080000100000051102162220035800001002003920039200392003920039
80204200381500402580100100800001008000050056000002001920038200389982399968010020080000200200382003811802011009910010080000100000051102162220035800001002003920039200392003920039
80204200381500402580100100800001008000050056000012001920038200389973399968010020080000200200382003811802011009910010080000100000051102162220035800001002003920039200392003920039
80204200381550402580100100800001008000050056000012001920038200389973399968010020080000200200382003811802011009910010080000100000051102162220035800001002003920039200392003920039

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)9fa8accfd0d5d6dadbddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242004015501272580010108000010800005056000012001920038200389996310018800102080000202003820038118002110910108000010005020051600752003580000102003920039200392003920039
80024200381550622580010108000010800005056000012001920038200389996310018800102080000202003820038118002110910108000010005020051600572003580000102003920039200392003920039
80024200381550812580010108000010800005056000002001920038200389996310018800102080000202003820038118002110910108000010005020071600752003580000102003920039200392003920039
800242003815501252580010108000010800005056000002001920038200389996310018800102080000202003820038118002110910108000010005020071600572003580000102003920039200392003920039
800242003815501272580010108000010800005056000002001920038200389996310018800102080000202003820038118002110910108000010005020051600752003580000102003920039200392003920039
800242003815501232580010108000010800005056000002001920038200389996310018800102080000202003820038118002110910108000010005020071600572003580000102003920039200392003920039
80024200381550392580010108000010800005056000002001920038200389996310018800102080000202003820038118002110910108000010005020071600752003580000102003920039200392003920039
80024200381560392580010108000010800005056000002001920038200389996310018800102080000202003820038118002110910108000010005020051600752003580000102003920039200392003920039
800242003815503522580010108000010800005056000002001920038200389996310018800102080000202003820038118002110910108000010005020051600572003580000102003920039200392003920039
800242003815602072580010108000010800005056000002001920038200389996310018800102080000202003820038118002110910108000010005020051600752003580000102003920039200392003920039