Apple M1 Microarchitecture Research by Dougall Johnson

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

UQSHL (immediate, vector, 8H)

Test 1: uops

Code:

  uqshl v0.8h, v0.8h, #3
  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
100420371506116862510001000100026452102018203720371571318951000100010002037203711100110000073116221786100020382038203820382038
100420371506116862510001000100026452102018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
100420371506116862510001000100026452102018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
100420371508716862510001000100026452102018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
100420371506116862510001000100026452102018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
100420371506116862510001000100026452102018203720371571318951000100010002037203711100110000373116111786100020382038203820382038
100420371606116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038

Test 2: Latency 1->2

Code:

  uqshl v0.8h, v0.8h, #3
  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)0318191e3f4e51inst 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)9facc2cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204200371500006119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100007102162219791100001002003820038200382003820038
10204200371500006119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100007102162219791100001002003820038200382003820038
10204200371500006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100007102162219791100001002003820038200382003820038
102042003715000073619686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100007102162219791100001002003820038200382003820038
10204200371500006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100007102162219791100001002003820038200382003820038
10204200371500006119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100007102162219791100001002003820038200382003820038
10204200371500006119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100007102162219791100001002003820038200382003820038
10204200371500006119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100007102162219791100001002003820038200382003820038
10204200371500006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100007102162219791100001002003820038200382003820038
10204200371500006119686251010010010000100100005002847521020018200372003718421318745101002041000020010000200372003711102011009910010010000100027102162219791100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)0308091e3f4e51inst 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)9fa8acbranch mispredict (cb)cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1002420037150000611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010000640216221978610000102003820038200382003820038
10024200371500005361968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010160640216221978610000102003820038200382003820038
10024200371500006119686251001010100001010000502847521120018200372008418443318767100102010000201000020037200371110021109101010000103501640216221978610000102003820038200382003820038
1002420037150000611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010000640216221978610000102003820038200382003820038
10024200371500006119686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100990640216221978610000102003820038200382003820038
1002420037150000611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010000640216221978610000102003820038200382003820038
100242003715000061196862510010101000010100005028475211200182003720037184433187671001020100002010000200372003711100211091010100001001350640216221978610000102003820038200382003820038
10024200371500006119686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100210640216221978610000102003820038200382003820038
1002420037150000611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010030640216221978610000102003820038200382003820038
1002420037150000611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000640216221978610000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  uqshl v0.8h, v8.8h, #3
  uqshl v1.8h, v8.8h, #3
  uqshl v2.8h, v8.8h, #3
  uqshl v3.8h, v8.8h, #3
  uqshl v4.8h, v8.8h, #3
  uqshl v5.8h, v8.8h, #3
  uqshl v6.8h, v8.8h, #3
  uqshl v7.8h, v8.8h, #3
  movi v8.16b, 9

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code divided by count): 0.2506

retire (01)cycle (02)0308090b18191e1f3a3f51inst 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)9fa0a1a6a8a9acc2c5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200471500000000029258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100000000011151180160020035800001002003920039200392003920039
80204200381500000000029258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100000000011151180160020035800001002003920039200392003920039
80204200381500000000029258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100000000011151180160020035800001002003920039200392003920039
80204200381500000000029258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100000000011151180160020035800001002003920039200392003920039
80204200381500000000094258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100000000011151180160020035800001002003920039200392003920039
80204200381500000000029258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100000000011151180160020035800001002003920039200392003920039
80204200381500000000029258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100000000011151180160020035800001002003920039200392003920039
80204200381500000000029258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100000000011151180160020035800001002003920039200392003920039
80204200381500000000029258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100000000011151180160020035800001002003920039200392003920039
80204200381500000000029258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100000000011151180620020035800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03040708090b18191e1f3a3f51inst 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)9fa0a1a7a8a9acc2cdcfd0d5d6d9ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242005115000000000001072580010108000010800005064000012001920038200389996031001880010208000020800002003820038118002110910108000010000000005020031604220035080000102003920039200392003920039
80024200381500000000000822580010108000010800005064000012001920038200389996031001880010208000020800002003820038118002110910108000010000000005020041602420035080000102003920039200392003920039
80024200381500000000000822580010108000010800005064000012001920038200389996031001880010208000020800002003820038118002110910108000010000000005020021602320035080000102003920039200392003920039
80024200381500000000000882580010108000010800005064000012001920038200389996031001880010208000020800002003820038118002110910108000010000000005020021602420035080000102003920039200392003920039
80024200381500000000000962580010108000010800005064000012001920038200389996031001880010208000020800002003820038118002110910108000010000000005020041604220035080000102003920039200392003920039
800242003815000000000002182580010108000010800005064000012001920038200389996031001880010208000020800002003820038118002110910108000010000000005020041604420035080000102003920039200392003920039
800242003815000000000002182580010108000010800005064000012001920038200389996031001880010208000020800002003820038118002110910108000010000000005020041602420035080000102003920039200392003920039
800242003815000000000009672580010108000010800005064000012001920038200389996031001880010208000020800002003820038118002110910108000010000000005020041602420035080000102003920039200392003920039
80024200381500000000000902580010108000010800005064000012001920038200389996031001880010208000020800002003820038118002110910108000010000000005020021602420035080000102003920039200392003920039
80024200381500000000000822580010108000010800005064000012001920038200389996031001880010208000020800002003820038218002110910108000010000003005020041604220035080000102003920039200392003920039