Apple M1 Microarchitecture Research by Dougall Johnson

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

FMAXP (vector, 8H)

Test 1: uops

Code:

  fmaxp v0.8h, v0.8h, v1.8h
  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)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)a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
1004203715010316872510001000100026468002018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371506116872510001000100026468002018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371606116872510001000100026468002018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371606116872510001000100026468012018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371506116872510001000100026468002018203720371572318951000100020002037203711100110000373116111787100020382038203820382038
100420371506116872510001000100026468002018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
1004203715317616872510001000100026468002018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371506116872510001000100026468002018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371508416872510001000100026468002018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371506116872510001000100026468002018203720371572318951000100020002037203711100110000073116111787100020382038203820382038

Test 2: Latency 1->2

Code:

  fmaxp v0.8h, v0.8h, v1.8h
  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)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)9fa8accfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102042003715006119687251010010010000100100005002847680200182003720037184223187451010020010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
102042003715006119687251010010010000100100005002847680200182003720037184223187451010020010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
102042003715006119687251010010010000100100005002847680200182003720037184223187451010020010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
102042003715006119687251010010010000100100005002847680200182003720037184223187451010020010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820087
10204200371503218419687251010010010000100100005002847680200182003720037184223187451025720010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
102042003715006119687251010010010000100100005002847680200182003720037184223187451010020010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
102042003715006119687251010010010000100100005002847680200182003720037184223187451010020010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
102042008615006119687251010010010000100100005002847680200182003720037184223187451010020010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
10204200371503156119687251010010010000100100005002847680200182003720037184223187451010020010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
102042003715006119687251010010010000100100005002847680200182003720037184223187451010020010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)0308091e3f4e51inst 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)9fa1a8cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100242003715000061196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
100242003715000661196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
10024200371500034261196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
10024200371500022861196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
10024200371500012631196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
100242003715000061196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
100242003715000661196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
100242003715000061196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000640217221978510000102003820038200382003820038
1002420037150001561196872510010101000010100005028476800200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
1002420037150000726196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038

Test 3: Latency 1->3

Code:

  fmaxp v0.8h, v1.8h, v0.8h
  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)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)9fa6a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102042003715008919687251010010010000100100005002847680200182003720037184223187451010020010000200200002003720037111020110099100100100001000007102162219791100001002003820038200382003820038
102042003715006119687251010010010000100100005002847680200182003720037184223187451010020010000200200002003720037111020110099100100100001000007102162219791100001002003820038200382003820038
1020420037150216119687251010010010000100100005002847680200182003720037184223187451010020010000200200002003720037111020110099100100100001000007102162219791100001002003820038200382003820038
10204200371605166119687251010010010000100100005002847680200182003720037184223187451010020010000200200002003720037111020110099100100100001000007102162219791100001002003820038200382003820038
10204200371502556119687251010010010000100100005002847680200182003720037184223187451010020010000200200002003720037111020110099100100100001000007102162219791100001002003820038200382003820038
102042003715006119687251010010010000100100005002847680200182003720037184223187451010020010000200200002003720037111020110099100100100001000007102162219791100001002003820038200382003820038
102042003715006119687251010010010000100100005002847680200182003720037184223187451010020010000200200002003720037111020110099100100100001000007102162219791100001002003820038200382003820038
102042003716106119687251010010010000100100005002847680200182003720037184223187451010020010000200200002003720037111020110099100100100001000007102162219791100001002003820038200382003820038
102042003714936119687251010010010000100100005002847680200182003720037184223187451010020010000200200002003720037111020110099100100100001000007102162219791100001002003820038200382003820038
1020420037150156119687251010010010000100100005002847680200182003720037184223187451010020010000200200002003720037111020110099100100100001000007102162219791100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)033f4e51inst 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)9fa7a8acc2cdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100242003715061196872510010101000010100005028476801200182003720037184443187871001020100002020000200372003711100211091010100001001000640216221978510000102003820038200382003820038
100242003715071196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001005202600640216221978510000102003820038200382003820038
100242003715061196872510010101000010100005028476800200182003720037184443187671001020100002020000200372003711100211091010100001004000640216221978510000102003820038200382003820038
100242003715061196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001004000640216221978510000102003820038200382003820038
100242003715091196872510010101000010100005028476800200182003720037184443187671001020100002020000200372003711100211091010100001005000640216221978510000102003820038200382003820038
100242003715061196872510010101000010100005028476800200182003720037184443187671001020100002020000200372003711100211091010100001006000640216221978510000102003820038200382003820038
100242003715061196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001005799000640216221978510000102003820038200382003820038
100242003715061196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001005000640216221978510000102003820038200382003820038
100242003715061196872510010101000010100005028476800200182003720037184443187671001020100002020000200372003711100211091010100001003000640216221978510000102003820038200382003820038
10024200371506119687251001010100001010000502847680120018200372003718444318767100102010000202000020037200371110021109101010000100012900640216221978510000102003820038200382003820038

Test 4: throughput

Count: 8

Code:

  fmaxp v0.8h, v8.8h, v9.8h
  fmaxp v1.8h, v8.8h, v9.8h
  fmaxp v2.8h, v8.8h, v9.8h
  fmaxp v3.8h, v8.8h, v9.8h
  fmaxp v4.8h, v8.8h, v9.8h
  fmaxp v5.8h, v8.8h, v9.8h
  fmaxp v6.8h, v8.8h, v9.8h
  fmaxp v7.8h, v8.8h, v9.8h
  movi v8.16b, 9
  movi v9.16b, 10

(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)9fa0a1a8a9accdcfd5d6dbddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200591500000392580100100800001008000050064000012001920038200389973399968010020080000200160000200382003811802011009910010080000100000000511021611120035800001002003920039200392003920039
8020420038150000016825801001008000010080000500640000020019200382003899733999680100200800002001600002003820038118020110099100100800001000017000511011601120035800001002003920039200392003920039
802042003815000001702580100100800001008000050064000002001920038200389973399968010020080000200160000200382003811802011009910010080000100000430511011601120035800001002003920039200392003920039
802042003815000097082580100100800001008000050064000012001920038200389973399968010020080000200160000200382003811802011009910010080000100000000511011601120035800001002003920039200392003920039
80204200381500000402580100100800001008000050064000002001920038200389973399968010020080000200160000200382003811802011009910010080000100000000511011601120035800001002003920039200392003920039
80204200381500000402580100100800001008000050064000002001920038200389973399968010020080000200160000200382003811802011009910010080000100000000511011601120035800001002003920039200392003920039
80204200381500000402580100100800001008000050064000002001920038200389973399968010020080000200160000200382003811802011009910010080000100000000511011601120035800001002003920039200392003920039
80204200381500000402580100100800001008000050064000002001920038200389973399968010020080000200160000200382003811802011009910010080000100020000511011601120035800001002003920039200392003920039
80204200381500000402580100100800001008000050064000002001920038200389973399968010020080000200160000200382003811802011009910010080000100001000511011601120035800001002003920039200392003920039
8020420038150000010722580100100800001008000050064000002001920049200389973799968022120080000202160196200992010021802011009910010080000100000000511011601120035800001002003920039200392003920039

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)5f60696b6d6edispatch 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)9fa8accfd2d5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200471500842580010108000010800005064000001200190200382003899960310018800102080000201600002003820038118002110910108000010005020010161782003580000102003920039200392003920039
80024200381500452580010108000010800005064000000200190200382003899960310018800102080000201600002003820038118002110910108000010005020017168172003580000102003920039200392003920039
8002420038150039258001010800001080000506400000120019020038200389996031001880010208000020160000200382003811800211091010800001003502008166172003580000102003920039200392003920039
80024200381500392580010108000010800005064000001200190200382003899960310018800102080000201600002003820038118002110910108000010035020017161782003580000102003920039200392003920039
800242003815003925800101080000108000050640000002001902003820038999673100188001020800002016000020038200381180021109101080000100245020017161782003580000102003920039200392003920039
80024200381500452580010108000010800005064000001200190200382003899960310018800102080000201600002003820038118002110910108000010265020071616162003580000102003920039200392003920039
80024200381500392580010108000010800005064000001200190200382003899960310018800102080000201600002003820038118002110910108000010035020071617172003580000102003920039200392003920039
80024200381500392580010108000010800005064000011200190200382003899960310018800102080000201600002003820038118002110910108000010035020017168172003580000102003920039200392003920039
80024200381500452580010108000010800005064000000200190200382003899960310018800102080000201600002003820038118002110910108000010018835020061617172003580000102003920039200392003920039
8002420038150010762580010108000010800005064000001200190200382003899960310018800102080000201600002003820038118002110910108000010005020061614172003580000102003920039200392003920039