Apple M1 Microarchitecture Research by Dougall Johnson

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

FCMLE (vector, zero, 2S)

Test 1: uops

Code:

  fcmle 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)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)a8cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
1004203715061168625100010001000264521201820372037157131895100010001000203720371110011000073116111786100020382038203820382038
1004203715061168625100010001000264521201820372037157131895100010001000203720371110011000073116111786100020382038203820382038
1004203715061168625100010001000264521201820372037157131895100010001000203720371110011000073116111786100020382038203820382038
100420371524103168625100010001000264521201820372037157131895100010001000203720371110011000073116111786100020382038203820382038
1004203715061168625100010001000264521201820372037157131895100010001000203720371110011000073116111786100020382038203820382038
1004203716084168625100010001000264521201820372037157131895100010001000203720371110011000073116111786100020382038203820382038
1004203715084168625100010001000264521201820372037157131895100010001000203720371110011000073116111786100020382038203820382038
1004203715061168625100010001000264521201820372037157131895100010001000203720371110011000073116111786100020382038203820382038
1004203715061168625100010001000264521201820372037157131895100010001000203720371110011000373116111786100020382038203820382038
1004203715082168625100010001000264521201820372037157131895100010001000203720371110011000073116111786100020382038203820382038

Test 2: Latency 1->2

Code:

  fcmle 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)03081e3f4e51inst 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? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102042003715000821968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000071011611197910100001002003820038200382003820038
102042003715000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000071011611197910100001002003820038200382003820038
102042003715000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000071011611197910100001002003820038200382003820038
102042003715000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000071011641197910100001002003820038200382003820038
102042003715000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000071011611197910100001002003820038200382003820038
102042003715000841968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000071011611197910100001002003820038200382003820038
1020420037150001471968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000071011611197910100001002003820038200382003820038
102042003715000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000071011611197910100001002003820038200382003820038
102042003715000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000071011611197910100001002003820038200382003820038
102042003715000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000071011611197910100001002003820038200382003820038

1000 unrolls and 10 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)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)9fa8cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024200371500611968625100101010000101000050284752120018200372003718443318767100102010000201000020037200371110021109101010000100640316221982210000102003820038200382003820038
1002420037150399611968625100101010000121015250284752120018200372003718443318767100102010000201000020037200371110021109101010000100640216221978610000102003820038200382003820038
100242003715001561968625100101010000101000050284752120018200372003718443318767100102010000201000020037200371110021109101010000100640216231978610000102003820038200382003820038
10024200371500611968625100101010000101000050284752120018200372003718443318767100102010000201000020037200371110021109101010000100640216221978610000102003820038200382003820038
1002420037150270611968625100101010000101000050284752120018200372003718443318767100102010000201000020037200371110021109101010000100640216221978610000102003820038200382003820038
10024200371500611968625100101010000101000050284752120018200372003718443318767100102010000201000020037200371110021109101010000100640216221978610000102003820038200382003820038
10024200371500611968625100101010000101000050284752120018200372003718443318767100102010000201000020037200371110021109101010000100640216221978610000102003820038200382003820038
100242003715001491968625100101010000101000050284752120018200372003718443318767100102010000201000020037200371110021109101010000100640216221978610000102003820038200382003820038
10024200371500611968625100101010000101000050284752120018200372003718443318767100102010000201000020037200371110021109101010000100640216221978610000102003820038200382003820038
10024200371500611968625100101010000101000050284752120018200372003718443318767100102010000201000020037200371110021109101010000100640216221978610000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  fcmle v0.2s, v8.2s, #0
  fcmle v1.2s, v8.2s, #0
  fcmle v2.2s, v8.2s, #0
  fcmle v3.2s, v8.2s, #0
  fcmle v4.2s, v8.2s, #0
  fcmle v5.2s, v8.2s, #0
  fcmle v6.2s, v8.2s, #0
  fcmle 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)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)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)9fc5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
802042005715002925801081008000810080020500640132020019200382003899776998980120200800322008003220038200381180201100991001008000010011151184160020035800001002003920039200392003920039
802042003815002925801081008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010011151180160020035800001002003920039200392003920039
802042003815054369425801081008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010011151180160020035800001002003920039200392003920039
802042003815002925801081008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010011151180160020035800001002003920039200392003920039
802042003815039225801081008000810080020500640132020019200382003899776998980120200800322008003220038200381180201100991001008000010011151180160020035800001002003920039200392003920039
802042003815002925801081008000810080020500640132020019200382003899776998980120200800322008003220038200381180201100991001008000010011151180160020035800001002003920039200392003920039
802042003815002925801081008000810080020500640132020019200382003899776998980120200800322008003220038200381180201100991001008000010011151180163020035800001002003920039200392003920039
802042003815002925801081008000810080020500640132020019200382003899776998980120200800322008003220038200381180201100991001008000010011151180160020035800001002003920039200392003920039
802042003815002925801081008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010011151180160020035800001002003920039200392003920039
802042003815002925801081008000810080020500640132020019200382003899776998980120200800322008003220038200381180201100991001008000010011151180160020035800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03080b18191e1f3a3f51inst 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)5d60696d6edispatch 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)9fa0a1a7a8a9accfd5d6dbddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200501500000000210258001010800001080000506400001120019200382003899963100188001020800002080000200382003811800211091010800001000000050201160112003580000102003920039200392003920039
800242003815000004920044258001010800001080000506400000120019200382003899963100188001020800002080000200382003811800211091010800001000000050201160112003580000102003920039200392003920039
8002420038150000000039258001010800001080000506400000120019200382003899963100188001020800002080000200382003811800211091010800001000000050201160112003580000102003920039200392003920039
8002420038150000000039258001010800001080000506400000120019200382003899963100188001020800002080000200382003811800211091010800001000000050201160112003580000102003920039200392003920039
8002420038149000000039258001010800001080000506400000120019200382003899963100188001020800002080000200382003811800211091010800001000000050201160112003580000102003920039200392003920039
800242003815000005100039258001010800001080000506400000120019200382003899963100188001020800002080000200382003811800211091010800001000000050201160112003580000102003920039200392003920039
8002420038150000000039258001010800001080000506400000120019200382003899963100188001020800002080000200382003811800211091010800001000000050201160112003580000102003920039200392003920039
8002420038150000000039258001010800001080000506400000020019200382003899963100188001020800002080000200382003811800211091010800001000000050891160112003580000102003920039200392003920039
8002420038150000000039258001010800001080000506400000020019200382003899963100188001020800002080000200382003811800211091010800001000000050201160112003580000102003920039200392003920039
8002420038150000000039258001010800001080000506400000020019200382003899963100188001020800002080000200382003811800211091010800001000000050201160112003580000102003920039200392003920039