Apple M1 Microarchitecture Research by Dougall Johnson

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

SQSHL (immediate, scalar, D)

Test 1: uops

Code:

  sqshl d0, d0, #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)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)a0a6a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
100420371500611686251000100010002645210201820372037157131895100010001000203720371110011000000073216221786100020382038203820382038
100420371500611686251000100010002645210201820372037157131895100010001000203720371110011000000073216221786100020382038203820382038
100420371500611686251000100010002645211201820372037157131895100010001000203720371110011000000073216221786100020382038203820382038
100420371500611686251000100010002645210201820372037157131895100010001000203720371110011000000073216221786100020382038203820382038
100420371500611686251000100010002645210201820372037157131895100010001000203720371110011000000073216221786100020382038203820382038
100420371500611686251000100010002645210201820372037157131895100010001000203720371110011000000073216221786100020852038203820382038
100420371600611686251000100010002645210201820372037157131895100010001000203720371110011000000073216221786100020382038203820382038
100420371500611686251000100010002645211201820372037157131914100010001000203720371110011000000073216221786100020382038203820382038
100420371500611686251000100010002645210201820372037157131895100010001000203720371110011000000073216221786100020382038203820382038
100420371500611686251000100010002645210201820372037157131895100010001163203720371110011000000073216221786100020382038203820382038

Test 2: Latency 1->2

Code:

  sqshl d0, d0, #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)030b18191e1f3a3f4e51inst 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)9fa0a6a8a9acc2branch mispredict (cb)cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204200371500000006119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371500000006119686251010010010000100100005002849735120018200372003718421318745101002001000020010000200372003711102011009910010010000100001000071011611197910100001002003820038200382003820038
10204200371500000006119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371500000006119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371500000006119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
102042003715000000044119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371500000006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371500000006119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371500000006119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371490000006119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038

1000 unrolls and 10 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)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)9fa0a6a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1002420037150000006119686251001010100001010000502852577120018200372003718443318767100102010000201000020037200371110021109101010000100040006404168319786010000102003820038200382003820038
1002420037150000008219686251001010100001010000502847521120018200372003718443318767100102010000201000020037200371110021109101010000100000006403164319786010000102003820038200382003820038
1002420037150000006119686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000006404166419786010000102003820038200382003820038
10024200371500003063119686251001010100481010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000006404163419786010000102003820038200382003820038
1002420037150000006119686831001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000006404163419786010000102003820038200382003820038
1002420037150000006119686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100010306403163419786010000102003820038200382003820038
10024200371500000010319686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000906403164419786010000102003820038200382003820038
1002420037150000006119686251001010100001010000602847521020018200372003718443318767100102010000201000020037200371110021109101010000100010006404164319786010000102003820038200382003820038
1002420037150000006119686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100010306403163419786010000102003820038200382003820038
1002420037150000006119686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000306404164319786010000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  sqshl d0, d8, #3
  sqshl d1, d8, #3
  sqshl d2, d8, #3
  sqshl d3, d8, #3
  sqshl d4, d8, #3
  sqshl d5, d8, #3
  sqshl d6, d8, #3
  sqshl d7, d8, #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)0307081e3f51inst 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)9fa8acc5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
802042004915010029258010810080008100800205006401322001920038200389977699898012020080032200800322003820038118020110099100100800001000011151184164020035800001002003920039200392003920039
802042003815000929258010810080008100800205006401322001920038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020035800001002003920039200392003920039
802042003815000029258010810080008100800205006401322001920038200389977699898012020080032200800322003820038118020110099100100800001000011151200160020035800001002003920039200392003920039
8020420038150000280258010810080008100800205006401322001920038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020035800001002003920039200392003920039
80204200381500001464258010810080008100800205006401322001920038200389977699898012020080032200800322003820038118020110099100100800001001011151184160020035800001002003920039200392003920039
802042003815000029258010810080008100800205006401322001920038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020035800001002003920039200392003920039
802042003815000029258010810080008100800205006401322001920038200389977699898012020080032200800322003820038118020110099100100800001000311151180160020035800001002003920039200392003920039
8020420038150000124258010810080008100800205006401322001920038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020035800001002003920039200392003920039
802042003815010029258010810080008100800205006401322001920038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020035800001002003920039200392003920039
802042003815000029258010810080008100800205006401322001920038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020035800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)0307080a18191e1f3f51inst 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)9fa0a1a6a7a8a9acc2cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200391500000000852580010108000010800005064000012001920038200389996031001880010208000020800002003820038118002110910108000010000000905020616562003580000102003920039200392003920039
80024200381500000000392580010108000010800005064000012001920038200389996031001880010208000020800002003820038118002110910108000010000000005020316352003580000102003920039200392003920039
80024200381500010000392580010108000010800005064000012001920038200389996031001880010208000020800002003820038118002110910108000010000000605020516352003580000102003920039200392003920039
80024200381500000000392580010108000010800005064000012001920038200389996031001880010208000020800002003820038118002110910108000010000000005020516532003580000102003920039200392003920039
80024200381500000000392580010108000010800005064000012001920038200389996031001880010208000020800002003820038118002110910108000010000000005020516532003580000102003920039200392003920039
800242003814900000002292580010108000010800005064000012001920038200389996031001880010208000020800002003820038118002110910108000010000020005020416552003580000102003920039200392003920039
80024200381500000000392580010108000010800005064000012001920038200389996031001880010208000020800002003820038118002110910108000010000000005020316532003580000102003920039200392003920039
80024200381500000000392580010108000010800005064000012001920038200389996081001880010208000020800002003820038118002110910108000010000000005020316452003580000102003920039200392003920039
80024200381500000000392580010108000010800005064000012001920038200389996031001880010208000020800002003820038118002110910108000010000000005020516532003580000102003920039200392003920039
80024200381500000000392580010108000010800005064000012001920038200389996031001880010208000020800002003820038118002110910108000010000010005020516352003580000102003920039200392003920039