Apple M1 Microarchitecture Research by Dougall Johnson

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

NEG (vector, 8H)

Test 1: uops

Code:

  neg v0.8h, v0.8h
  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)03081e3f4e51inst 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)accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
100420371500611686251000100010002645211201820372037157131895100010001000203720371110011000073116111786100020382038203820382038
100420371500611686251000100010002645211201820372037157131895100010001000203720371110011000073116111786100020382038203820382038
100420371600611686251000100010002645211201820372037157131895100010001000203720371110011000073116111786100020382038203820382038
100420371500611686251000100010002645211201820372037157131895100010001000203720371110011000073116111786100020382038203820382038
100420371500611686251000100010002645211201820372037157131895100010001000203720371110011000073116111786100020382038203820382038
100420371500611686251000100010002645211201820372037157131895100010001000203720371110011000073116111786100020382038203820382038
100420371500611686251000100010002645211201820372037157131895100010001000203720371110011000073116111786100020382038203820382038
100420371500611686251000100010002645211201820372037157131895100010001000203720371110011000073116111786100020382038203820382038
100420371500611686251000100010002645211201820372037157131895100010001000203720371110011000073116111786100020382038203820382038
100420371510611686251000100010002645211201820372037157131895100010001000203720371110011000073116111786100020382038203820382038

Test 2: Latency 1->2

Code:

  neg v0.8h, v0.8h
  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)031e1f3f4e51inst 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)9fa8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204200371500061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000607102162219791100001002003820038200382003820038
1020420037150006119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100007102162219791100001002003820038200382003820038
1020420037149006119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100007102162219791100001002003820038200382003820038
1020420037150006119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100007102162219791100001002003820038200382003820038
102042003715000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010001627102162219791100001002003820038200382003820038
1020420037150006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100007102162219791100001002003820038200382003820038
1020420037150006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100007102162219791100001002003820038200382003820038
1020420037150006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100007102162219791100001002003820038200382003820038
1020420037150006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100007102162219791100001002003820038200382003820038
1020420037150006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100007102162219791100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)03080b181e1f3f4e51inst 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)9fa0a1a6a8acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100242003715000021061196862510010101000010100005028475211200182003720037184433187671001020100002010000200372003711100211091010100001000052006403162219786010000102003820038200382003820038
1002420037150000906119686251001010100001010000502847521120018200372003718443318767100102010000201000020037200371110021109101010000100000006402162219786010000102003820038200382003820038
1002420037150000006119686251001010100001010000502847521120018200372003718443318767100102010000201000020037200371110021109101010000100000006402162219786010000102003820038200382003820038
1002420037150000006119686251001010100001010000502847521120018200372003718443318767100102010000201000020037200371110021109101010000100000006402162219786010000102003820038200382003820038
10024200371500000025119686251001010100001010000502847521120018200372008518443318767100102010000201000020037200371110021109101010000100000006402162219786010000102003820038200382003820038
1002420037150000006119686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000006402162219786010000102003820038200382003820038
1002420037150000006119686251001010100001010000502847521120018200372003718443318767100102010000201000020037200371110021109101010000100000792306402162219786010000102003820038200382003820038
10024200371500000061196862510010101000010100005028475211200182003720037184433187671001020100002010000200372003711100211091010100001000055006402162219786010000102003820038200382003820038
100242003715000000611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000691506402162219786010000102003820038200382003820038
1002420037150000006119686251001010100001010000502847521120018200372003718443318767100102010000201000020037200371110021109101010000100000006402162219786010000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  neg v0.8h, v8.8h
  neg v1.8h, v8.8h
  neg v2.8h, v8.8h
  neg v3.8h, v8.8h
  neg v4.8h, v8.8h
  neg v5.8h, v8.8h
  neg v6.8h, v8.8h
  neg v7.8h, v8.8h
  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)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)9fa6a8a9acc2c5branch mispredict (cb)cdcfd5d6dde0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8020420059150000504258010810080008100800205006401322001920038200389977699898012020080032200800322003820038118020110099100100800001000450001115118116020035800001002003920039200392003920039
8020420038150000292580108100800081008002050064013220019200382003899776998980120200800322008003220038200381180201100991001008000010000015601115118016020035800001002003920039200392003920039
80204200381500002925801081008000810080020500640132200192003820038997769989801202008003220080032200382003811802011009910010080000100000901115118016020079800001002003920039200392003920039
80204200381510002925801081008000810080020500640132200192003820038997769989801202008003220080032200382003811802011009910010080000100050601115118016020035800001002003920039200392003920039
802042003815000029258010810080008100800205006401322001920038200389977699898012020080032200800322003820038218020110099100100800001000430301115118016020035800001002003920039200392003920039
80204200381500002925801081008000810080020500640132200192003820038997769989801202008003220080032200382003811802011009910010080000100000001115118016020035800001002003920039200392003920039
8020420038150000292580108100800081008002050064013220019200382003899776998980120200800322008003220038200381180201100991001008000010000011101115118016020035800001002003920039200392003920039
80204200381500002925801081008000810080020500640132200192003820038997769989801202008003220080032200382003811802011009910010080000100000301115118016020035800001002003920039200392003920039
80204200381500002925801081008000810080020500640132200192003820038997769989801202008003220080032200382003811802011009910010080000100000001115118016020035800001002003920039200392003920039
80204200381500002925801081008000810080020500640132200192003820038997769989801202008003220080032200382003811802011009910010080000100000301115118016020035800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03080a0b191e1f3f51inst 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)9fa0a1a6a8a9accfd0d2d5d6d9dadbddinst fetch restart (de)e0eaeb? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200511500000003925800101080000108000050640000020019200382003899963100188001020800002080000200382003811800211091010800001000020050200022160002514200350080000102003920039200392003920039
80024200381500100003925800101080000108000050640000020019200382009099963100188001020800002080000200382003811800211091010800001000020050200021160002621200350080000102003920039200392003920039
80024200381500000003925800101080000108000050640000020019200382003899963100188001020800002080000200382003811800211091010800001000000050200020170002519200350080000102003920039200392003920039
80024200381500000003925800101080000108000050640000020019200382003899963100188001020800002080000200382003811800211091010800001000010050200013160002412200350080000102003920039200392003920039
80024200381500000003925800101080000108000050640000020019200382003899963100188001020800002080000200382003821800211091010800001000000050223016160002716200350080000102003920039200392003920039
80024200381510000008125800101080000108000050640000020019200382003899963100188001020800002080000200382003811800211091010800001000012950200013160002715200350080000102003920039200392003920089
80024200381500010003925800101080000108000050640000020019200382003899963100188001020800002080000200382003811800211091010800001000010350200015160002526200350080000102003920039200392003920039
80024200381500000003925800101080000108000050640000020019200382003899963100188001020800002080000200382003811800211091010800001000050350200027160002727200350080000102008720090200392003920039
80024200381500000003925800101080000108000050640000020019200382003899963100188001020800002080000200382003811800211091010800001000000050200016160002714200350080000102003920039200392003920039
8002420038150000000392580010108000010800005064000002001920038200389996310018800102080000208000020038200381180021109101080000100004019250560026160001427200350080000102003920039200392003920039