Apple M1 Microarchitecture Research by Dougall Johnson

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

CMLE (zero, 2S)

Test 1: uops

Code:

  cmle v0.2s, v0.2s, #0
  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)03191e3f4e51inst 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
100420371500611686251000100010002645212018203720371571318951000100010002037203711100110000073316221786100020382038203820382038
100420371500611686251000100010002645212018203720371571318951000100010002037203711100110000073216221786100020382038203820382038
1004203715012611686251000100010002645212018203720371571318951000100010002037203711100110000073216221786100020382038203820382038
100420371500611686251000100010002645212018203720371571318951000100010002037203711100110000073216221786100020382038203820382038
100420371500611686251000100010002645212018203720371571318951000100010002037203711100110000073216221786100020382038203820382038
100420371500611686251000100010002645212018203720371571318951000100010002037203711100110000073216221786100020382038203820382038
100420371500611686251000100010002645212018203720371571318951000100010002037203711100110000073216221786100020382038203820382038
100420371500611686251000100010002645212018203720371571318951000100010002037203711100110000073216221786100020382038203820382038
100420371509611686251000100010002645212018203720371571318951000100010002037203711100110000073216221786100020382038203820382038
100420371500611686251000100010002645212018203720371571318951000100010002037203711100110000073216221786100020382038203820382038

Test 2: Latency 1->2

Code:

  cmle v0.2s, v0.2s, #0
  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)9fa8a9cfd0d5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204200371501115346196862510100100100001001000050028475210200182003720037184213187451010020010000200100002003720037111020110099100100100001001071001161119791100001002003820038200382003820038
10204200371490111761196862510120130100001001000050028475210200182003720084184213187451010020010000200100002003720037111020110099100100100001000071001161119791100001002003820038200382003820038
102042003715000061196862510100100100001001000056628487850200182003720037184213187451010020010000200100002003720037111020110099100100100001000071001161119791100001002003820038200382003820038
102042003715000061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001001071001161119791100001002003820038200382003820038
102042003715000061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001001471001161119825100001002003820038200382003820038
102042008515100061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000071001161119791100001002003820038200382003820038
102042003715000061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000071001161119791100001002003820038200382003820038
10204200371500021061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000071001161119791100001002003820038200382003820038
102042003715000061196862510100100100001001000050028475211200222003720037184213187631010020010000200100002003720037111020110099100100100001000071001161119791100001002003820038200382003820038
10204200371500039061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000071001161119791100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)03080b18191e1f3a3f4e51inst 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)9fa0a1a6a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024200371500000120061196862510010101000010100005028475211200182003720037184433187671001020100002010000200372003711100211091010100001000000006402162219786010000102003820038200382003820038
1002420037150000000061196862510010101000010100005028475211200182003720037184433187671001020100002010000200372003711100211091010100001000000006402162219786010000102003820038200382003820038
1002420037150000000061196862510010101000010100005028475211200182003720037184433187671001020100002010000200372003711100211091010100001000000006402162219786010000102003820038200382003820038
100242003714900003330061196862510010101000010100005028475211200542003720037184433187671001020100002010000200372003711100211091010100001000000006402162219786010000102003820038200382003820038
100242003715000002400251196862510010101000010100005028475211200182003720037184433187671001020100002010000200372003711100211091010100001000000006402162219786010000102003820038200382003820038
1002420037150000000061196862510010101000010100005028475211200182003720037184433187671001020100002010000200372003711100211091010100001000000006402162219786010000102003820038200382003820038
1002420037150000000061196862510010101000010100005028475211200182003720037184433187671001020100002010000200372003711100221091010100001000000006402162219786010000102003820038200382003820038
10024200371500000420061196862510010101000010100005028475211200182003720037184433187671001020100002010000200372003711100211091010100001000000006402754219786010000102003820038200382003820038
10024200371500000000124196862510010101000010100005028475211200182003720037184433187671001020100002010000200372003711100211091010100001000000006402162219786010000102003820038200382003820038
10024200371500000360061196862510010101000010100005028475211200182003720037184433187671001020100002010000200372003711100211091010100001000000006402162219786010000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  cmle v0.2s, v8.2s, #0
  cmle v1.2s, v8.2s, #0
  cmle v2.2s, v8.2s, #0
  cmle v3.2s, v8.2s, #0
  cmle v4.2s, v8.2s, #0
  cmle v5.2s, v8.2s, #0
  cmle v6.2s, v8.2s, #0
  cmle v7.2s, v8.2s, #0
  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)030818191e3f51inst 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)cdcfd6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200591500005129258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100000000011151181600200350800001002003920039200392003920039
8020420038150000029258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100000000011151181600200350800001002003920039200392003920039
8020420038150000329258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100000000011151181600200350800001002003920039200392003920039
8020420038150000029258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100000000011151181600200350800001002003920039200392003920039
8020420038150000629648010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100000000011151181600200350800001002003920039200392003920039
8020420038150000029258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100000000211151181600200350800001002003920039200392003920135
8020420038150000029258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100000000011151181600200350800001002003920039200392003920039
8020420038150000050258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100000000011151181600200350800001002003920039200392003920039
8020420038150000057258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100000000211151181600200350800001002003920039200392003920039
8020420038151000050258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100000000011151181600200350800001002003920039200392003920039

1000 unrolls and 10 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)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)9fa8acc5cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200511500003007042580010108000010800005064000012001920038200389996310018800102080000208000020038200381180021109101080000100005020616762003580000102003920039200392003920039
8002420038150000000392580010108000010800005064000012001920038200389996310018800102080000208000020038200381180021109101080000100005020616562003580000102003920039200392003920039
8002420038150000000392580010108000010800005064000012001920038200389996310018800102080000208000020038200381180021109101080000100005020816562003580000102003920039200392003920039
8002420038150000000392580010108000010800005064000012001920038200389996310018800102080000208000020038200381180021109101080000100005020516752003580000102003920039200392003920039
8002420038150000000392580010108000010800005064000012001920038200389996710018800102080000208000020038200381180021109101080000100005020616562003580000102003920039200392003920039
8002420038150000000392580010108000010800005064000012001920038200389996310018800102080000208000020038200381180021109101080000100005020516562003580000102003920039200392003920039
8002420038150000000392580010108000010800005064000012001920038200389996310018800102080000208000020038200381180021109101080000100005020716872003580000102003920039200392003920039
8002420038150000000392580010108000010800005064000012001920038200389996310018800102080000208000020038200381180021109101080000100005020816852003580000102003920039200392003920039
8002420038150000000392580010108000010800005064000012001920038200389996310018800102080000208000020038200381180021109101080000100005020816562003580000102003920039200392003920039
8002420038150000000392580010108000010800005064000012001920038200389996310018800102080000208000020038200381180021109101080000100005020516872003580000102003920039200392003920039