Apple M1 Microarchitecture Research by Dougall Johnson

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

CMGT (zero, D)

Test 1: uops

Code:

  cmgt d0, d0, #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)a8cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
10042037150611686251000100010002645210201820372037157131895100010001000203720371110011000073116111786100020382038203820382038
10042037150821686251000100010002645210201820372037157131895100010001000203720371110011000073116111786100020382038203820382038
100420371501491686251000100010002645210201820372037157131895100010001000203720371110011000073116111786100020382038203820382038
10042037150611686251000100010002645210201820372037157131895100010001000203720371110011000073116111786100020382038203820382038
10042037150611686251000100010002645210201820372037157131895100010001000203720371110011000073116111786100020382038203820382038
10042037150611686251000100010002645210201820372037157131895100010001000203720371110011000073116111786100020382038203820382038
10042037150611686251000100010002645210201820372037157131895100010001000203720371110011000073116111786100020382038203820382038
10042037150611686251000100010002645210201820372037157131895100010001000203720371110011000073116111786100020382038203820382038
100420371515611686251000100010002645210201820372037157131895100010001000203720371110011000073116111786100020382038203820382038
100420371601031686251000100010002645210201820372037157131895100010001000203720371110011000073116111786100020382038203820382038

Test 2: Latency 1->2

Code:

  cmgt d0, d0, #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)0318191e1f3a3f4e51inst 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)~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)9fa0a1a8a9acc2c5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0ea? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102042003715000000611968625101001001000010010000500284752112001820037200371842861874110100200100082001000820037200371110201100991001001000010000000011171801600198010100001002003820038200382003820038
1020420037150000006119686251010010010000100100005002847521120018200372003718428618740101002001000820010008200372003711102011009910010010000100004106011171801600198000100001002003820038200382003820038
1020420037150003300611968625101001001000010010000500284752102001820037200371842131874510100200100002001000020037200371110201100991001001000010000300000071011611197910100001002003820038200382003820038
102042003715000000611968625101001001000010010000500284752102001820037200371842131874510100200100002001000020037200371110201100991001001000010000200000071011611197910100001002003820038200382003820038
102042003715000000611968625101001001000010010000500284752102001820037200371842131874510100200100002001000020037200371110201100991001001000010000120200071011611197910100001002003820038200382003820038
1020420037150120001261968625101001001000010010000500284752102001820037200371842131874510100204100002001000020037200371110201100991001001000010000002000000071012411197910100001002003820038200382003820038
102042003715000000611968625101001001000010010000500284752102001820037200371842131874510100200100002041016420037200371110201100991001001000010020106000073322511197910100001002003820038200382003820038
102042003715000000831968625101001001000010010000500284752102001820037200371842131874510100200100002001000020037200371110201100991001001000010000200000071011611197910100001002003820038200382003820038
102042017915000900611968625101001001000010010000500284752102001820037200371842131874510100200100002001000020037200371110201100991001001000010000000000071011611197910100001002003820038200382003820038
102042003715000000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000100000071011611197910100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)0308090b18191e1f3f4e51inst 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)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)9fa0a1a6a8a9acc2branch mispredict (cb)cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1002420037149000000061196862510010101000010100005028475212001820037200371844331876710010201000020100002003720037111002110910101000010000000006403162219786010000102003820038200382003820038
1002420037150000000061196862510010101000010100005028475212001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
1002420037150000000082196862510010101000010100005028475212001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
1002420037150000000061196862510010101000010100005028475212001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102012020038200382003820038
1002420037150000000061196862510010101000010100005028475212001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
10024200371500000000156196862510010101000010100005028475212001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
1002420037150000000061196862510010101000010100005028475212001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
1002420037150000000061196862510010101000010100005028475212001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
1002420037150000000061196862510010101000010101505028475212001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
1002420037150000000061196862510010101000010100005028475212001820037200371844331878810010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  cmgt d0, d8, #0
  cmgt d1, d8, #0
  cmgt d2, d8, #0
  cmgt d3, d8, #0
  cmgt d4, d8, #0
  cmgt d5, d8, #0
  cmgt d6, d8, #0
  cmgt d7, d8, #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)03070a1e3f51inst 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
80204200691501102925801081008000810080020500640132120019200382003899770699898012020080032200800322003820038118020110099100100800001000011151183161120035800001002003920039200392003920039
80204200381501102925801081008000810080020500640132120019200382003899770699898012020080032200800322003820038118020110099100100800001000011151181161220035800001002003920039200392003920039
80204200381501102925801081008000810080020500640132120019200382003899770699898012020080032200800322003820038118020110099100100800001000011151181161120035800001002003920039200392003920039
80204200381501102925801081008000810080020500640132120019200382003899770699898012020080032200800322003820038118020110099100100800001000011151181161120035800001002003920039200392003920039
802042003815011016625801081008000810080020500640132120019200382003899770699898012020080032200800322003820038118020110099100100800001000011151182161120035800001002003920039200392003920090
80204200381501102925801081008000810080020500640132120019200382003899770699898012020080032200800322003820038118020110099100100800001000011151181161120035800001002003920039200392003920039
80204200381501102925801081008000810080020500640132120019200382003899770699898012020080032200800322003820038118020110099100100800001000011151181161120035800001002003920039200392003920039
80204200381501102925801081008000810080020500640132120019200382003899770699898012020080032200800322003820038118020110099100100800001000011151181162120035800001002003920039200392003920039
80204200381501102925801081008000810080020500640132120019200382003899770699898012020080032200800322003820038118020110099100100800001000011151181161120035800001002003920039200392003920039
802042003815011029258010810080008100800205006401321200192003820038997706998980120200800322008003220038200381180201100991001008000010052311151181161120035800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)030b181e3f51inst 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)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)9fa6a8accdcfd0d5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200511500003925800101080000108000050640000200192003820038999631001880010208000020800002003820038118002110910108000010010050200216232003580000102003920233200392003920088
80024200381500003925800101080000108000050640000200192003820038999631001880010208000020800002003820038118002110910108000010000050200316332003580000102003920039200392003920039
80024200381500003925800101080000108000050640000200192003820038999631001880010208000020800002003820038118002110910108000010000050200316332003580000102003920039200392003920039
80024200381500003925800101080000108000050640724200192003820038999631001880010208000020800002003820038118002110910108000010010050200216332003580000102003920039200392003920039
80024200381500008325800101080000108000050640000200192003820038999631001880010208000020800002003820038118002110910108000010000050200216232003580000102003920039200392003920039
80024200381500003925800101080000108000050640000200192003820038999631001880010208000020800002003820038118002110910108000010000050200316322003580000102003920192200392003920039
800242003815000022925800101080000108000050640000200192003820038999631001880010208000020800002003820038118002110910108000010000050200316322003580000102003920039200392003920039
80024200381500003925800101080000108000050640000200192003820038999631001880010208000020800002003820038118002110910108000010000050200316232003580000102003920039200392003920039
80024200381500003925800101080000108000050640000200192003820038999631001880010208000020800002003820038118002110910108000010000050200316332003580000102003920039200392003920039
80024200381500003925800101080000108000050640000200192003820038999631001880010208000020800002003820038118002110910108000010000050200316332003580000102003920039200392003920039