Apple M1 Microarchitecture Research by Dougall Johnson

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

SSHLL (8H)

Test 1: uops

Code:

  sshll v0.8h, v0.8b, #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)696d6edispatch 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
10042037150611686251000100010002645212018203720371571318951000100010002037203711100110000073316221786100020382038203820382038
10042037150611686251000100010002645212018203720371571318951000100010002037203711100110000073216221786100020382038203820382038
100420371501031686251000100010002645212018203720371571318951000100010002037203711100110000073216221786100020382038203820382038
100420371554611686251000100010002645212018203720371571318951000100010002037203711100110002073216221786100020382038203820382038
100420371501371686251000100010002645212018203720371571318951000100010002037203711100110000073216221786100020382038203820382038
100420371560611686251000100010002645212018203720371571318951000100010002037203711100110000073216221786100020382038203820382038
100420371503681686251000100010002645212018203720371571318951000100010002037203711100110000073216221786100020382038203820382038
10042037150611686251000100010002645212018203720371571318951000100010002037203711100110000073216221786100020382038203820382038
10042037150611686251000100010002645212018203720371571318951000100010002037203711100110000073216221786100020382038203820382038
100420371502401686251000100010002645212018203720371571318951000100010002037203711100110000073216221786100020382038203820382038

Test 2: Latency 1->2

Code:

  sshll v0.8h, v0.8b, #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)030818191e1f3f4e51inst 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)9fa0a6a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204200371500000061196862510100100100001001000050028475212001820037200371842131874510100200100002001000020037200371110201100991001001000010000000071011611197910100001002003820038200382003820038
10204200371500000061196862510100100100001001000050028475212001820037200371842131874510100200100002001000020037200371110201100991001001000010000000071011611197910100001002003820038200382003820038
102042003715000000667196862510100100100001001000050028475212001820037200371842131874510100200100002001000020037200371110201100991001001000010000000071011611197910100001002003820038200382003820038
10204200371500000061196862510100100100001001000050028475212001820037200371842131874510100200100002001000020037200371110201100991001001000010000000071011611197910100001002003820038200382003820038
10204200371500009061196862510100100100001001000050028475212001820037200371842131874510100200100002001000020037200371110201100991001001000010000000071011611197910100001002003820038200382003820038
10204200371500000061196862510100100100001001000050028475212001820037200371842131874510100200100002001000020037200371110201100991001001000010000000071011611197910100001002003820038200382003820038
10204200371500000061196862510100100100001001000050028475212001820037200371842131874510100200100002001000020037200371110201100991001001000010000000071011611197910100001002003820038200382003820038
102042003715000027061196862510100100100001001000050028475212001820037200371842131874510100200100002001000020037200371110201100991001001000010000000071011611197910100001002003820038200382003820038
1020420037150000372061196862510100100100001001000050028475212001820037200371842131874510100200100002001000020037200371110201100991001001000010000000071011611197910100001002003820038200382003820038
10204200371500000061196862510100100100001001000050028475212001820037200371842131874510100200100002001000020037200371110201100991001001000010000000071011611197910100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)030b18191e1f3f4e51inst 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)9fa6a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024200371500003906119686251001010100001010000502847521120018020037200371844331876710010201000020100002003720037111002110910101000010000006402162219786010000102003820038200382003820038
10024200371500001806119686251001010100001010000502847521120018020037200371844331876710010201000020100002003720037111002110910101000010000006402162219786010000102003820038200382003820038
1002420037150000606119686251001010100001010000502847521120018020037200371844331876710010201000020100002003720037111002110910101000010000006402162219786010000102003820038200382003820038
1002420037150000006119686251001010100001010000502847521120018020037200371844331876710010201000020100002003720037111002110910101000010000006402162219786010000102003820038200382003820038
1002420037150000606119686251001010100001010000502847521020018020037200371844331876710010201000020100002003720037111002110910101000010000006402162219786010000102003820038200382003820038
1002420037150000006119686251001010100001010000502847521120018020037200371844331876710010201000020100002003720037111002110910101000010000006402162219786010000102003820038200382003820038
1002420037150000006119686251001010100001010000502847521020018020037200371844331876710010201000020100002003720037111002110910101000010000006402162219786010000102003820038200382003820038
10024200371490002406119686251001010100001010000502847521120018020037200371844331876710010201000020100002003720037111002110910101000010000006402162219786010000102003820038200382003820038
1002420037150000006119686251001010100001010000502847521120018020037200371844331876710010201000020100002003720037111002110910101000010000006402162219786010000102003820038200382003820038
1002420037150000006119686251001010100001010000502847521120018020037200371844331876710010201000020100002003720037111002110910101000010000006402162219786010000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  sshll v0.8h, v8.8b, #3
  sshll v1.8h, v8.8b, #3
  sshll v2.8h, v8.8b, #3
  sshll v3.8h, v8.8b, #3
  sshll v4.8h, v8.8b, #3
  sshll v5.8h, v8.8b, #3
  sshll v6.8h, v8.8b, #3
  sshll v7.8h, v8.8b, #3
  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)030b18191e1f3a3f51inst 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)9fa1a6a8a9acc2c5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200601500004500292580108100800081008002050064013220019200382003899776998980120200800322008003220038200381180201100991001008000010000000011151180160020035800001002003920039200392003920039
8020420038150000000292580108100800081008002050064013220019200382003899776998980120200800322008003220038200381180201100991001008000010000000011151180160020035800001002003920039200392003920039
8020420038150000000292580108100800081008002050064013220019200382003899776998980120200800322008003220038200381180201100991001008000010000000011151180161020035800001002003920039200392003920039
80204200381500001500292580108100800081008002050064013220019200382003899776998980120200800322008003220089200381180201100991001008000010000000011151180270020035800001002003920039200392003920039
80204200381500001500292580108100800081008002050064013220019200382003899776998980120200800322008003220038200381180201100991001008000010000000011151180160020035800001002003920039200392003920039
8020420038150000900292580108100800081008002050064013220019200382003899776998980120200800322008003220038200381180201100991001008000010000000011151180160020035800001002003920039200392003920039
8020420038150000900292580108100800081008002050064013220019200382003899776998980120200800322008003220038200381180201100991001008000010000000011151180160020035800001002003920039200392003920039
8020420038150000000292580108100800081008002050064013220019200382003899776998980120200800322008003220038200381180201100991001008000010000000011151180160020035800001002003920039200392003920039
8020420038150000000292580108100800081008002050064013220019200382003899776998980120200800322008003220038200381180201100991001008000010000000011151180160020035800001002003920039200392003920039
802042003815000026100292580108100800081008002050064013220019200382003899776998980120200800322008003220038200381180201100991001008000010000000011151180160020035800001002003920039200392003920039

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)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)9fa1a8acc2cfd0icache miss (d3)d5d6dbddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8002420051150039258001010800001080000506400000200192003820038999603100188001020800002080000200382003811800211091010800001000005020007160642003580000102003920039200392003920039
80024200381502439258001010800001080000506400001200192003820038999603100188001020800002080000200382003811800211091010800001000005020006160462003580000102003920039200392003920039
80024200381509338258001010800001080000506400000200192003820038999603100188001020800002080000200382003811800211091010800001000005020006160662003580000102003920039200392003920039
80024200381617239258001010800951080098506400000200192003820038999603100188001020800002080000200382003811800211091010800001000005020006160662003580000102003920039200392003920039
8002420038150039258001010800001080000506400000200192003820038999603100188001020800002080000200382003811800211091010800001000005020006160462003580000102003920039200392003920039
8002420038150039258001010800001080000506400001200192003820038999603100188001020800002080000200382003811800211091010800001000005020304160462003580000102003920039200392003920039
80024200381491239258001010800001080000506400000200192003820038999603100188001020800002080000200382003811800211091010800001000005020006160662003580000102003920039200392003920039
80024200381502739258001010800001080000506400000200192003820038999603100188001020800002080000200382003811800211091010800001000005020006160662003580000102003920039200392003920039
8002420038150039258001010800001080000506400001200192003820038999603100188001020800002080000200382003811800211091010800001000005020006160652003580000102003920039200392003920039
8002420038150039258001010800001080000506400000200192003820038999603100188001020800002080000200382003811800211091010800001000005020004160642003580000102003920039200392003920039