Apple M1 Microarchitecture Research by Dougall Johnson

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

CMEQ (zero, 2D)

Test 1: uops

Code:

  cmeq v0.2d, v0.2d, #0
  movi v0.16b, 1
  movi v1.16b, 2

(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)031e3f4e51inst 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)~map lookup fp/simd (81)8283pipeline redirect (84)85inst all (8c)inst neon or fp (9a)a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
100420371606116862510001000100026452102018203720371571318951000100010002037203711100110000073316331786100020382038203820382038
100420371506116862510001000100026452102018203720371571318951000100010002037203711100110000073316331786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000073316331786100020382038203820382038
100420371506116862510001000100026452102018203720371571318951000100010002037203711100110000073316221786100020382038203820382038
1004203715015616862510001000100026452102018203720371571318951000100010002037203711100110000073316231786100020382038203820382038
100420371506116862510001000100026452102018203720371571318951000100010002037203711100110000073316331786100020382038203820382038
100420371506116862510001000100026452102018203720371571318951000100010002037203711100110000073316331786100020382038203820382038
100420371506116862510001000100026452102018203720371571318951000100010002037203711100110000073316331786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000073316331786100020382038203820382038
100420371606116862510001000100026452112018203720371571318951000100010002037203711100110000073316331786100020382038203820382038

Test 2: Latency 1->2

Code:

  cmeq v0.2d, v0.2d, #0
  movi v0.16b, 1
  movi v1.16b, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)031e3f4e51inst 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)60696b6d6edispatch stall (70)scheduler rewind (75)scheduler stall (76)~dispatch op (78)~map op int (7c)~map op fp/simd (7e)~map lookup int (7f)~map lookup fp/simd (81)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)9fa8acc2cdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102042003715008219686251010010010000100100005002847521120018020037200371842131874510100200100002001000020037200371110201100991001001000010000407102162219791100001002003820038200382003820038
102042003715006119686251010010010000100100005002847521120018020037200371842131874510100200100002001000020037200371110201100991001001000010000007102162219791100001002003820038200382003820038
1020420037150025119686251010010010000100100005002847521120018020037200371842131874510100200100002001000020037200371110201100991001001000010000007102162219791100001002003820038200382003820038
102042003715006119686251010010010000100100005002847521120018020037200371842131874510100200100002001000020037200371110201100991001001000010000007102162219791100001002003820038200382003820038
102042003715006119686251010010010000100100005002847521120018020037200371842131874510100200100002001000020037200371110201100991001001000010000007102162219791100001002003820038200382003820038
1020420037150041119686251010010010000100100005002847521120018020037200371842131874510100200100002001000020037200371110201100991001001000010000007102162219791100001002003820038200382003820038
102042003715006119686251010010010000100100005002847521120018020037200371842131874510100200100002001000020037200371110201100991001001000010000007102162219791100001002003820038200382003820038
102042003715006119686251010010010000100101505532847521120018020037200371842131874510100200100002001000020037200371110201100991001001000010000007102162219791100001002003820038200382003820038
102042003715006119686251010010010000100100005002847521120018020037200371842131874510100200100002001000020037200371110201100991001001000010000007102162219791100001002003820038200382003820038
102042003715006119686251010010010000100100005002847521120018020037200371842131874510100200100002001000020037200371110201100991001001000010000007102162219791100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)03080918191e1f3f4e51inst 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)696d6edispatch stall (70)72scheduler rewind (75)scheduler stall (76)~dispatch op (78)~map op int (7c)~map op fp/simd (7e)~map lookup int (7f)~map lookup fp/simd (81)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)9fa0a1a6a8a9accfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100242003715002000010319686251001010100001010000502847521200182003720037184430318767100102010000201000020037200371110021109101010000100000006402162219786010000102003820038200382003820038
100242003715000000010319686451001010100001010000502847521200182003720037184430318767100102010000201000020037200371110021109101010000100000736402162219786010000102003820038200382003820038
10024200371500000006119686251001010100001010000502847521200182003720037184430318767100102010000201000020037200371110021109101010000100000006402162219786010000102003820038200382003820038
10024200371500000006119686251001010100001010000502847521200182003720037184430318767100102010000201000020037200371110021109101010000100000006402162219786010000102003820038200382003820038
10024200371500000006119686251001010100001010000502847521200182003720037184430318767100102010000201000020037200371110021109101010000100000006402162219786010000102003820038200382003820038
10024200371500000006119686251001010100001010000502847521200182003720037184430318767100102010000201000020037200371110021109101010000100000006402162219847010000102003820038200382003820038
10024200371500000006119686251001010100001010000502847521200182003720037184430318767100102010000201000020037200371110021109101010000100000006402162219786010000102003820038200382003820038
10024200371500000006119686251001010100001010000502847521200182003720037184430318767100102010000201000020037200371110021109101010000100000006402162219786010000102003820038200382003820038
10024200371500000006119686251001010100001010000502847521200182003720037184430318767100102010000201000020037200371110021109101010000100000006402162219786010000102003820038200382003820038
10024200371500000006119686251001010100001010000502847521200182003720037184430318767100102010000201000020037200372110021109101010000100000006402162219786010000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  cmeq v0.2d, v8.2d, #0
  cmeq v1.2d, v8.2d, #0
  cmeq v2.2d, v8.2d, #0
  cmeq v3.2d, v8.2d, #0
  cmeq v4.2d, v8.2d, #0
  cmeq v5.2d, v8.2d, #0
  cmeq v6.2d, v8.2d, #0
  cmeq v7.2d, v8.2d, #0
  movi v8.16b, 9

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

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

retire (01)cycle (02)033f51inst 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)72scheduler rewind (75)scheduler stall (76)~dispatch op (78)~map op int (7c)~map op fp/simd (7e)~map lookup int (7f)~map lookup fp/simd (81)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? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200571502925801081008000810080020500640132120019200382003899770699898012020080032200800322003820038118020110099100100800001000011151183163420035800001002003920039200392003920039
80204200381509425801081008000810080020500640132020019200382003899770699898012020080032200800322003820038118020110099100100800001000011151184164320035800001002003920039200392003920039
8020420038150292580108100800081008002050064013202001920038200389977069989801202008003220080032200382003811802011009910010080000100059111151185164420035800001002003920039200392003920039
80204200381502925801081008000810080020500640132020019200382003899770699898012020080032200800322003820038118020110099100100800001000011151184163320035800001002003920039200392003920039
80204200381502925801081008000810080020500640132020019200382003899770699898012020080032200800322003820038118020110099100100800001000011151184164420035800001002003920039200392003920039
80204200381502925801081008000810080020511640132020019200382003899770699898012020080032200800322003820038118020110099100100800001000011151185163320035800001002003920039200392003920039
80204200381502925801081008000810080020500640132020019200382003899770699898012020080032200800322003820038118020110099100100800001000011151185164320035800001002003920039200392003920039
80204200381502925801081008000810080020500640132020019200382003899770699898012020080032200800322003820038118020110099100100800001000011151182163320035800001002003920039200392003920039
80204200381502925801081008000810080020500640132020019200382003899770699898012020080032200800322003820038118020110099100100800001000011151182163420035800001002003920039200392003920039
80204200381505025801081008000810080020500640132020019200382003899770699898012020080032200800322003820038118020110099100100800001000011151183163420035800001002003920039200392003920039

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)5f60696d6edispatch stall (70)scheduler rewind (75)scheduler stall (76)~dispatch op (78)~map op int (7c)~map op fp/simd (7e)~map lookup int (7f)~map lookup fp/simd (81)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)9fa1a6a8a9accfd0d2d5d6d9daddinst fetch restart (de)e0eaeb? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200501500392580010108000010800005064000001200192003820038999631001880010208000020800002003820038118002110910108000010001005020002160043200350080000102003920039200392003920039
8002420038150402602580010108000010800005064075601200192003820038999631001880010208000020800002003820038118002110910108000010000005020001160033200350080000102003920039200392003920039
80024200381500392580010108000010800005064000000200192003820038999631001880010208000020800002003820038118002110910108000010000005020001160032200350080000102003920088200492003920039
800242003815004322580010108000010800005064000000200192003820038999631001880010208000020800002003820038118002110910108000010000005020001160032200350080000102003920039200392003920039
80024200381500392580010108000010800005064000000200192003820038999631001880010208000020800002003820038118002110910108000010000005020002160023200350080000102003920039200392003920039
80024200381500392580010108000010800005064000000200192003820038999631001880010208000020800002003820038118002110910108000010000005020001160036200350080000102003920039200392003920039
800242003815002102580010108000010800005064000000200192003820038999631001880010208000020800002003820038118002110910108000010000005020001160032200350080000102003920039200392003920039
80024200381500392580010108000010800005064000000200192003820038999631001880010208000020800002003820038118002110910108000010000005020001160023200350080000102003920039200392003920039
80024200381500392580010108000010800005064000000200192003820038999631001880010208000020800002003820038118002110910108000010000005020002160063200350080000102003920039200392003920039
80024200381500392580010108000010800005064000001200192003820038999631001880010208000020800002003820038118002110910108000010000005020001160038200350080000102003920039200392003920039