Apple M1 Microarchitecture Research by Dougall Johnson

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

SQSHLU (scalar, H)

Test 1: uops

Code:

  sqshlu h0, h0, #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)03091e3f4e51inst 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)a1a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
100420371500103168625100010001000264521120182037203715713189510001000100020372037111001100000073216221786100020382038203820382038
10042037150061168625100010001000264521120182037203715713189510001000100020372037111001100000073216221786100020382038203820382038
100420371500124168625100010001000264521120182037203715713189510001000100020372037111001100000073216221786100020382038203820382038
1004203716013261168625100010001000264521120182037203715713189510001000100020372037111001100000073216221786100020382038203820382038
10042037160061168625100010001000264521120182037203715713189510001000100020372037111001100000073216211786100020382038203820382038
10042037150061168625100010001000264521120182037203715713189510001000100020372037111001100000073216221786100020382038203820382038
100420371500103168625100010001000264521120182037203715713189510001000100020372037111001100000073216221786100020382038203820382038
10042037150061168625100010001000264521120182037203715713189510001000100020372037111001100000073216221786100020382038203820382038
10042037150061168625100010001000264521120182037203715713189510001000100020372037111001100000073216221786100020382038203820382038
10042037160061168625100010001000264521120182037203715713189510001000100020372037111001100000073216221786100020382038203820382038

Test 2: Latency 1->2

Code:

  sqshlu h0, h0, #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)031e3f4e51inst 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)9fa0a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020420037150061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
1020420037150061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
1020420037150084196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
10204200371500145196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
1020420037150061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000007121161119791100001002003820038200382003820038
102042003715018661196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
1020420037150061196862510100100100001001000050028475211200182008420037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
1020420037149061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
1020420037150061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
1020420037150061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000007101161119791100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)0318191e1f3f4e51inst 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)9fa0a8a9accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100242003715000006119686251001010100001010000502847521120018200372003718443318767100102010000201000020037200371110021109101010000100000640316221978610000102003820038200382003820038
100242003715000006119686251001010100001010000502847521120018200372003718443318767100102010000201000020037200371110021109101010000100003640216221978610000102003820038200382003820038
10024200371501008814919675251001010100001210000502847521120022200372003718443318767100102010000201000020037200841110021109101010000104220640216221978610000102003820038200382003820038
1002420037150000053619686251001010100001010000502847521120018200372003718443318767100102010000201000020037200371110021109101010000100003640216221978610000102003820038200742003820038
1002420037150000010319686251001010100001010000502847521120018200372003718443318767100102010000201000020037200371110021109101010000100003640216221978610000102003820038200382003820038
1002420037150000010319686251001010100001310000502847521120018200372003718443318767100102010000201016820084200371110021109101010000100103640216221978610000102003820038201332003820038
1002420037150000010319686251001010100001010000502847521120018201322003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
100242003715000006119686251001010100001010000502847521120018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
100242003715000006119686251001010100001010000502847521120018200372003718443318767100102010000201000020037200371110021109101010000100000640216321978610000102003820038200382003820038
100242003715000306119686251001010100001010000502847521120018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  sqshlu h0, h8, #3
  sqshlu h1, h8, #3
  sqshlu h2, h8, #3
  sqshlu h3, h8, #3
  sqshlu h4, h8, #3
  sqshlu h5, h8, #3
  sqshlu h6, h8, #3
  sqshlu h7, h8, #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)03070a0b1e1f3a3f51inst 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)cdcfd0d5d6ddinst fetch restart (de)dfe0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8020420038150111390029258010810080008100800205006401322001920038200389977699898012020080032200800322003820091118020110099100100800001000011151240616113200350800001002003920039200392003920039
802042003815011000340258010810080008100800205006401322001920038200389977699898012020080032200800322003820038118020110099100100800001000011151247116113200350800001002003920039200392003920039
802042003815011000340258010810080008100800205006401322001920038200389977699898012020080032200800322008720038118020110099100100800001000011151247116113200350800001002003920039200392003920039
8020420038150110210340258010810080008100800205006401322001920038200389977699898012020080134200800322003820038118020110099100100800001000011151247116113200350800001002003920039200392009420039
8020420038150110150340258010810080008100800205006401322001920038200389977699898012020080032200800322003820038118020110099100100800001002011151247116113200350800001002003920039200392003920039
80204200381501101203402580108100800081008002050064013220019200382003899776100148012020080032200801342003820038118020110099100100800001000011151247116113200350800001002003920039200392003920039
8020420038150110240340258010810080008100800205006401322001920038200389977699898012020080032200800322003820038118020110099100100800001000011151247116113200350800001002003920039200392003920039
802042003815011000340258010810080008100800205006401322001920038200389977699898012020080032200800322003820038118020110099100100800001000011151247116113200350800001002003920039200392003920039
802042003815011000382258010810080008100800205006401322001920038200389977699898012020080032200800322003820038118020110099100100800001001311151247116113200350800001002003920039200392003920039
8020420038150110003272258010810080008100800205006401322001920038200389977699898012020080032200800322003820038118020110099100100800001000011151247116113200350800001002003920092200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)0307080b1e1f3a3f51inst 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)9fa1a8a9acc2cfd5d6ddinst fetch restart (de)e0eaeb? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200511500000003925800101080000108000050640000020019200382003899960310018800102080000208000020038200381180021109101080000100000050348161714200350080000102003920039200392003920039
8002420038150000000319258001010800001080000506400000200192003820038999603100188001020800002080000200382003811800211091010800001000000503614161714200350080000102003920039200392003920039
80024200381500000880602580010108000010800005064000002001920038200389996031001880010208000020800002003820038118002110910108000010000005036101610172003515080000102003920039200392003920039
8002420038150000000104258001010800001080000506400000200192003820038999603100188001020800002080000200382003811800211091010800001000000503416161317200350080000102003920039200392003920039
8002420038150000000165258001010800001080000506400000200192003820038999603100188001020800002080000200382003811800211091010800001000000503410161710200350080000102003920039200392003920039
800242003815000000039258001010800001080000506400000200192003820038999603100188001020800002080000200382003811800211091010800001000000502817161417200350080000102003920039200392003920039
800242003815000000039258001010800001080000506400000200192003820038999603100188001020800002080000200382003811800211091010800001000000503717161717200350080000102003920039200392003920039
8002420038150000000211258001010800001080000506400000200192003820038999603100188001020800002080000200382003811800211091010800001000000503410161714200350080000102003920039200392003920039
80024200381500000003925800101080000108000050640000020019200382003899960310018800102080000208000020038200381180021109101080000100000050368161714200350080000102003920039200392003920039
800242003815000000039258001010800001080000506400000200192003820038999603100188001020800002080000200382003811800211091010800001000000503617161717200350080000102003920039200392003920039