Apple Microarchitecture Research by Dougall Johnson

M1/A14 P-core (Firestorm): Overview | Base Instructions | SIMD and FP Instructions
M1/A14 E-core (Icestorm):  Overview | Base Instructions | SIMD and FP Instructions

FMUL (by element, 4S)

Test 1: uops

Code:

  fmul v0.4s, v0.4s, v1.s[1]
  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 uop (01)cycle (02)031e3f4e51schedule uop (52)schedule simd uop (54)dispatch simd uop (57)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map simd uop (7e)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst simd alu (9a)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
100440373006134072510001000100053190804018403740373258338951000100020004037403711100110000073116113473100040384038403840384038
100440373006134072510001000100053190804018403740373258338951000100020004037403711100110000073116113473100040384038403840384038
100440373106134072510001000100053190804018403740373258338951000100020004037403711100110000073116113473100040384038403840384038
100440373006134072510001000100053190804018403740373258338951000100020004037403711100110000073116113473100040384038403840384038
100440373006134072510001000100053190804018403740373258338951000100020004037403711100110000073116113473100040384038403840384038
100440373006134072510001000100053190804018403740373258338951000100020004037403711100110000073116113473100040384038403840384038
100440373006134072510001000100053190804018403740373258338951000100020004037403711100110001073116113473100040384038403840384038
100440373006134072510001000100053190804018403740373258338951000100020004037403711100110004373116113473100040384038403840384038
100440373006134072510001000100053190804018403740373258338951000100020004037403711100110000073116113473100040384038403840384038
100440373006134072510001000100053190804018403740373258338951000100020004037403711100110000373116113473100040384038403840384038

Test 2: Latency 1->2

Code:

  fmul v0.4s, v0.4s, v1.s[1]
  movi v0.16b, 1
  movi v1.16b, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 4.0037

retire uop (01)cycle (02)031e3f4e51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d cache writeback (a8)accdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
10204400372990613940725101001001000010010000500570690804001840037400373810833874510100200100002002000040037400371110201100991001001000010000071011611394790100001004003840038400384003840038
10204400373000613940725101001001000010010000500570690814005340037400373810833874510100200100002002000040037400371110201100991001001000010000071011611394790100001004003840038400384003840038
10204400373000613940725101001001000010010000500570690814001840037400373810833874510100200100002002000040037400371110201100991001001000010000071011612394790100001004003840038400384003840038
10204400373000613940725101001001000010010000500570690814001840037400373810833874510100200100002002000040037400371110201100991001001000010000071011611394790100001004003840038400384003840038
10204400373000613940725101001001000010010000500570690814001840037400373810833876410100200100002002000040037400371110201100991001001000010000071011611394790100001004003840038400384003840038
10204400373000613940725101001001000010010000500570690804001840037400373810833874510100200100002002000040037400371110201100991001001000010000071011611394790100001004003840038400384003840038
10204400373000613940725101001001000010010000500570690814001840037400373810833874510100200100002002000040037400371110201100991001001000010000071011611394790100001004003840038400384003840038
102044003730002323940725101001001000010010000500570690814001840037400373810833874510100200100002002000040037400371110201100991001001000010000071011611394790100001004003840038400384003840038
10204400372990613940725101001001000010010000500570690814001840037400373810833874510100200100002002000040037400371110201100991001001000010000071011611394790100001004003840038400384003840038
102044003730045613940725101001001000010010000500570690814001840037400373810833874510100200100002002000040037400371110201100991001001000010000171011611394790100001004003840038400384003840038

1000 unrolls and 10 iterations

Result (median cycles for code): 4.0037

retire uop (01)cycle (02)031e3f4e51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)6061696d6emap stall dispatch (70)simd prf full (72)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fld unit uop (a6)l1d cache writeback (a8)acc2cfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1002440037300061394072510010101000010100005057069081540018400374003738130033876710010201000020200004003740037111002110910101000010000064054164439473010000104003840038400384003840038
1002440037300061394072510010101000010100005057069081540018400374003738130033876710010201000020200004003740037111002110910101000010000064054164439473010000104003840038400384003840038
1002440037300061394072510010101000010100005057069081340018400374003738130033876710010201000020200004003740037111002110910101000010000064034164439473010000104003840038400384003840038
1002440037299061394072510010101000010100005057069081340018400374003738130033876710010201000020200004003740037111002110910101000010000064034164439473010000104003840038400384003840038
10025400373000103394072510010101000010100005057069081340018400374003738130033876710010201000020200004003740037111002110910101000010000064033164439473010000104003840038400384003840038
1002440037300061394072510010101000010100005057069081340018400374003738130033876710010201000020200004003740037111002110910101000010000064033164439473010000104003840038400384003840038
1002440037300061394072510010101000010100005057069081340018400374003738130033876710010201000020200004003740037111002110910101000010000064033164439473010000104003840038400384003840038
1002440037300061394072510010101000010100005057069081340018400374003738130033876710010201000020200004003740037111002110910101000010000064034164439473010000104003840038400384003840038
1002440037300061394072510010101000010100005057069081340018400374003738130033876710010201000020200004003740037111002110910101000010000064034164339473010000104003840038400384003840038
1002440037300061394072510010101000010100005057069081340018400374003738130033876710010201000020200004003740037111002110910101000010000064034164439473010000104003840038400384003840038

Test 3: Latency 1->3

Code:

  fmul v0.4s, v1.4s, v0.s[1]
  movi v0.16b, 1
  movi v1.16b, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 4.0037

retire uop (01)cycle (02)031e3f4e51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fld unit uop (a6)l1d cache writeback (a8)acbranch cond mispred nonspec (c5)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1020440037300061394072510100100100001001000050057069081400184003740037381083387451010020010000200200004003740037111020110099100100100001000000071012511394790100001004003840038400384003840038
10204400373000726394072510100100100001001000050057069081400184003740037381083387451010020010000200200004003740037111020110099100100100001000000071011611394790100001004003840038400384003840038
1020440037300061394072510100100100001001000050057069081400184003740037381083387451010020010000200200004003740037111020110099100100100001000000071011611394790100001004003840038400384003840038
1020440037300061394072510100100100001001000050057069081400184003740037381083387451010020010000200200004003740037111020110099100100100001000000071011611394790100001004003840038400384003840038
1020440037299061394072510100100100001001000050057069081400184003740037381083387451010020010000200200004003740037111020110099100100100001002000171011611394790100001004003840038400384003840038
1020440037300061394072510100100100001001000050057069081400184003740037381083387451010020010000200200004003740037111020110099100100100001000000071011611394790100001004003840038400384003840038
1020440037300061394072510100100100001001000050057069081400184003740037381083387451010020010000200200004003740037111020110099100100100001000000071011611394790100001004003840038400384003840038
1020440037300061394072510100100100001001000050057069081400184003740037381343387451010020010000200200004003740037111020110099100100100001000000071011611394790100001004003840038400384003840038
1020440037299061394072510100100100001001000050057069081400184003740037381083387451010020010000200200004003740037111020110099100100100001000000071011611394790100001004003840038400384003840038
1020440037300061394072510100100100001001000050057069081400184003740037381083387451010020010000200200004003740037111020110099100100100001000000071011611394790100001004003840038400384003840038

1000 unrolls and 10 iterations

Result (median cycles for code): 4.0037

retire uop (01)cycle (02)03mmu table walk data (08)09181e3f4e51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)6061696b6d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d tlb miss (a1)l1d cache writeback (a8)a9acbranch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1002440037300000061394072510010101000010100005057069080040018040037400373813033876710010201000020200004003740037111002110910101000010000006405163339473010000104003840038400384003840038
1002440037300000061394072510010101000010100005057069080040018040037400373813033876710010201000020200004022840037111002110910101000010000006403163339473010000104003840038400384003840038
1002440037300000061394072510010101000010100005057069081040018040037400373813033876710010201000020200004003740037111002110910101000010000006403163339473010000104003840038400384003840038
1002440037300000061394072510010101000010100005057069081040018040037400373813033876710010201000020200004003740037111002110910101000010000006403163339473010000104003840038400384003840038
1002440037299000061394072510010101000010100005057069081040018040037400373813033876710010201000020200004003740037111002110910101000010000006403163339473010000104003840038400384003840038
1002440037300000061394072510010101000010100005057069081040018040037400373813033876710010201000020200004003740037111002110910101000010000006403163339473010000104003840038400384003840038
1002440037300000061394072510010101000010100005057069081040018040037400373813033876710010201000020206484003740037111002110910101000010000006613163339473010000104003840038400384003840038
1002440037299000089394072510010101000010100005057069081040018040037400373813033876710010201000020200004003740037111002110910101000010000006403163339509010000104003840038400384003840038
1002440037300000061394072510010101000010100005057069081040018040037400373813033876710010201000020200004003740037111002110910101000010000006403163339473010000104003840038400384003840038
1002440037300000061394072510010101000010100005057069081040018040037400373813033876710010201000020200004003740037111002110910101000010000006403163339473010000104003840038400384003840038

Test 4: throughput

Count: 8

Code:

  fmul v0.4s, v8.4s, v9.s[1]
  fmul v1.4s, v8.4s, v9.s[1]
  fmul v2.4s, v8.4s, v9.s[1]
  fmul v3.4s, v8.4s, v9.s[1]
  fmul v4.4s, v8.4s, v9.s[1]
  fmul v5.4s, v8.4s, v9.s[1]
  fmul v6.4s, v8.4s, v9.s[1]
  fmul v7.4s, v8.4s, v9.s[1]
  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 uop (01)cycle (02)031e3f51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
80204200601503094225801001008000010080000500640000020021200402004099733999880100200800002001600002004020040118020110099100100800001000051103161120037800001002004120041200412004120041
80204200401502734225801001008000010080000500640000020021200402004099733999880100200800002001600002004020040118020110099100100800001000051101161120037800001002004120041200412004120041
8020420040150274225801001008000010080000500640000020021200402004099733999880100200800002001600002004020040118020110099100100800001000051101161120037800001002004120041200412004120041
80204201111502824225801001008000010080000500640000020021200402004099733999880100200800002001600002004020040118020110099100100800001000051101161120037800001002004120041200412004120041
80204200401504414225801001008000010080000500640000020021200402004099733999880100200800002001600002004020040118020110099100100800001000051101162120037800001002004120041200412004120041
8020420040150214225801001008000010080000500640000020021200402004099733999880100200800002001600002004020040118020110099100100800001000051102161120037800001002004120041200412004120041
802042004015004225801001008000010080000500640000120021200402004099733999880100200800002001600002004020040118020110099100100800001000051101161120037800001002004120041200412004120041
802042004015006325801001008000010080000500640000020021200402004099733999880100200800002001600002004020040118020110099100100800001000051101161120037800001002004120041200412004120041
802042004015004225801001008000010080000500640000020021200402004099733999880100200800002001600002004020040118020110099100100800001000051101161120037800001002004120041200412004120041
80204200401502644249801001008000010080000500640000020021200402004099733999880100200800002001600002004020040118020110099100100800001000051101161120037800001002004120041200412004120041

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03l2 tlb miss data (0b)181e1f3f51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d tlb access (a0)l1d cache writeback (a8)accfd2d5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
800242004915000304125800101080000108000050640000200212004020040999631002080010208000020160000200402004011800211091010800001000050200116112003780000102004120041200412004120041
80024200401500022204125800101080000108000050640000200212004020040999631002080010208000020160000200402004011800211091010800001000050200116112003780000102004120041200412004120041
80024200401500025504125800101080000108000050640000200212004020040999631002080010208000020160000200402004011800211091010800001000050200116112003780000102004120041200412004120041
80024200401500042904125800101080000108000050640000200212004020040999631002080010208000020160214200402004011800211091010800001000050200116112003780000102004120041200412004120041
800242004015000004125800101080000108000050640000200212004020040999631002080010208000020160000200402004011800211091010800001000050200116112003780000102004120041200412004120041
800242004015010004125800101080000108000050640000200212004020040999631002080010208000020160000200402004011800211091010800001000050200116112003780000102004120041200412004120041
800242004015000004125800101080000108000050640000200212004020040999631002080010208000020160000200402004011800211091010800001000050200116112003780000102004120041200412004120041
800242004015000904125800101080000108000050640000200212004020040999631002080010208000020160000200402004011800211091010800001000050200116112003780000102004120041200412004120041
8002420040150002704125800101080000108000050640000200212004020040999631002080010208000020160000200402004011800211091010800001000050200116112003780000102004120041200412004120041
8002420040150000032625800101080000108000050640000200212004020040999631002080010208000020160000200402004011800211091010800001000050200116112003780000102004120041200412004120041