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

FRSQRTS (vector, 2D)

Test 1: uops

Code:

  frsqrts v0.2d, v0.2d, v1.2d
  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)03091e3f4e51schedule 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
1004403730006134072510001000100053190814018403740373258338951000100020004037403711100110000073116113473100040384038403840384038
1004403730006134072510001000100053190814018403740373258338951000100020004037403711100110000073116113473100040384038403840384038
1004403731006134072510001000100053190814018403740373258338951000100020004037403711100110000073116113473100040384038403840384038
1004403730006134072510001000100053190814018403740373258338951000100020004037403711100110000073116113473100040384038403840384038
10044037300061340725100010001000531908140184037403732583389510001000200040374037111001100002473116113473100040384038403840384038
10044037300061340725100010001000531908140184037403732583389510001000200040374037111001100001273116113473100040384038403840384038
1004403730006134072510001000100053190814018403740373258338951000100020004037403711100110000073116113473100040384038403840384038
1004403730006134072510001000100053190814018403740373258338951000100020004037403711100110000073116113473100040384038403840384038
10044037300061340725100010001000531908140184037403732583389510001000200040374037111001100005473116113473100040384038403840384038
1004403730006134072510001000100053190814018403740373258338951000100020004037403711100110000073116113473100040384038403840384038

Test 2: Latency 1->2

Code:

  frsqrts v0.2d, v0.2d, v1.2d
  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)60696b6d6emap 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)acbranch cond mispred nonspec (c5)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
102044003730006139407251010010010000100100005005706908140018040037400373810833874510100200100002002000040037400371110201100991001001000010000007101161139479100001004008540038400384003840038
102044003730006139407251010010010000100100005005706908140018040037400373810833874510100200101652042000040037400371110201100991001001000010000107101161139479100001004003840038400384003840038
1020440084300186139407251010010010000100100005005706908140018340037400373810833874510100200100002002000040037400371110201100991001001000010000007101161139479100001004003840038400384003840038
102044003729906139407251010010010000100100005005706908140018040037400373810833874510100200100002002000040037400371110201100991001001000010000007101161139479100001004003840038400384003840038
102044003730006139407251010010010000100100005005706908140018040037400373810833874510100200100002002000040037400371110201100991001001000010000007101161139479100001004003840038400384003840038
1020440037300072639407251010010010000100100005005706908140018040037400373810833874510100200100002002000040037400371110201100991001001000010000007101161139479100001004003840038400384003840038
102044003730006139407251010010010000100100005005706908140018040037400373810833874510100200100002002000040037400371110201100991001001000010000007101161139479100001004003840038400384003840038
1020440037300010339407251010010010000100100005005706908140018040037400373810833874510100200100002002000040037400371110201100991001001000010000007101161139483100001004003840038400384003840038
102044003730008239407251010010010000100100005005706908140018040037400373810833874510100200100002002000040037400371110201100991001001000010000007101161139479100001004003840038400384003840038
102044003730006139407251010010010000100100005005706908140018040037400373810833874510100200100002002000040037400371110201100991001001000010000007101161139479100001004003840038400384003840038

1000 unrolls and 10 iterations

Result (median cycles for code): 4.0037

retire uop (01)cycle (02)03mmu table walk data (08)18191e1f3f4e51schedule 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 tlb access (a0)l1d tlb miss (a1)l1d cache writeback (a8)a9accdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
10024400372990000072639407251001010100001010000505706908140018400374003738130338767100102010000202000040037400371110021109101010000100000006402162239473010000104003840038400384003840038
1002440037300000006139407251001010100001010000505706908140018400374003738130338767100102010000202000040037400371110021109101010000100000306402162239473010000104003840038400384003840038
1002440037300000006139407251001010100001010000505706908140018400374003738130338767100102010161202000040037400371110021109101010000100000006402162239473210000104003840038400384003840038
1002440037300000006139407251001010100001010000505706908140018400854003738130338767100102010000202000040037400371110021109101010000100000006402162239473010000104003840038400384003840038
1002440037300000006139407251001010100001010000505706908140018400374003738130338767100102010000202000040037400371110021109101010000100000006402162239473010000104003840038400384003840038
1002440037300000006139407251001010100001010000505706908140018400374003738130338767100102010000202000040037400371110021109101010000100000006402162239473010000104003840038400384003840038
10024400373000000089739407251001010100001010000505706908140018400374003738130338767100102010000202000040037400371110021109101010000100000006402162239473010000104003840038400384003840038
1002440037300000006139407251001010100001010000505706908140018400374003738130338767100102010000202000040037400371110021109101010000100000016402162239473010000104003840038400864003840038
10024400373000000010339407251001010100001010000505706908140018400374003738130338767100102010000202000040037400371110021109101010000100000006402162239473010000104003840085400384003840038
1002440037299000906139407251001010100001010000505706908140018400374003738130338767100102010000202000040037400371110021109101010000100000006402162339473010000104003840038400384003840038

Test 3: Latency 1->3

Code:

  frsqrts v0.2d, v1.2d, v0.2d
  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)03l2 tlb miss data (0b)18191e1f3f4e51schedule 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)acbranch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
102044003730000021061394072510100100100001001000050057069081400184003740037381083387451010020010000200200004003740037111020110099100100100001000007101161139479100001004003840038400384003840038
10204400373000006061394072510100100100001001000050057069081400184003740037381083387451010020010000200200004003740037111020110099100100100001000007101161139479100001004003840038400384003840038
102044003730010018061394072510100100100001001000056457069081400184003740037381083387451010020010000200200004003740037111020110099100100100001003007101161139479100001004003840038400384003840038
102044003729900018132613940725101001001000010010000500570690814001840037400373810833874510100200100002002000040230400371110201100991001001000010001207101161139479100001004003840038400384003840038
10204400372990000061394072510100100100001001000050057069081400184003740037381083387451010020010000200200004003740037111020110099100100100001000007101161139479100001004003840038400384003840038
102044003729900000685394072510100100100001001000050057069081400184003740037381083387451010020010000200200004003740037111020110099100100100001000007101161139479100001004003840038400384003840038
10204400373000000061394072510100100100001001000050057069081400184003740037381083387451010020010000200200004003740037111020110099100100100001000007101161139479100001004003840038400384003840038
10204400373000000061394072510100100100001001000050057069081400184003740037381083387451010020010000200200004003740037111020110099100100100001000007101161139479100001004003840038400384003840038
102044003730000030061394072510100100100001001000050057069081400184003740226381083387451010020010000200200004003740037111020110099100100100001000007101161139479100001004003840038400384003840038
102044003730000084061394072510100100100001001000050057069081400184003740037381083387451010020010000200200004003740037111020110099100100100001000007101161139479100001004003840038400384003840038

1000 unrolls and 10 iterations

Result (median cycles for code): 4.0037

retire uop (01)cycle (02)03191e1f3f4e51schedule 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)acbranch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
10024400373000007263940725100101010000101000050570690804001840037400373813033876710010201000020200004003740037111002110910101000010000640216223947310000104003840038400384003840038
1002440037300000613940725100101010000101000050570690804001840037400373813033876710010201000020200004003740037111002110910101000010000640216223947310000104003840038400384003840038
1002440037300000613940725100101010000101000050570690814001840037400373813033876710010201000020200004003740037111002110910101000010000640216223947310000104003840038400384003840038
1002440037299000613940725100101010000101000050570690814001840037400373813033876710010201000020200004003740037111002110910101000010000640216223947310000104003840038400384003840038
1002440037300000613940725100101010000101000050570690814001840037400373813033876710010201000020200004003740037111002110910101000010000640216223947310000104003840038400384003840038
1002440037300000613940725100101010000101000050570690814001840037400373813033876710010201000020200004003740037111002110910101000010000640216223947310000104003840038400384003840038
10024400373000300613940725100101010000101000050570690814001840037400373813033876710010201000020200004003740037111002110910101000010000640216223947310000104003840038400384003840038
1002440037300000613940725100101010000101000050570690814001840037400373813033876710010201000020200004003740037111002110910101000010000640216223947310000104003840038400384003840038
1002440037300000613940725100101010000101000050570690814001840037400373813033876710010201000020200004003740037111002110910101000010000640216223947310000104003840038400384003840038
1002440037300000613940725100101010000101000050570690814001840037400373813033876710010201000020200004003740037111002110910101000010000640216223954410000104003840038400384003840038

Test 4: throughput

Count: 8

Code:

  frsqrts v0.2d, v8.2d, v9.2d
  frsqrts v1.2d, v8.2d, v9.2d
  frsqrts v2.2d, v8.2d, v9.2d
  frsqrts v3.2d, v8.2d, v9.2d
  frsqrts v4.2d, v8.2d, v9.2d
  frsqrts v5.2d, v8.2d, v9.2d
  frsqrts v6.2d, v8.2d, v9.2d
  frsqrts v7.2d, v8.2d, v9.2d
  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)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 cache writeback (a8)accdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
8020420060150514225801001008000010080000500640000200212004020040997339998801002008000020016000020040200401180201100991001008000010000051102161120037800001002004120041200412004120041
8020420040150274225801001008000010080000500640000200212004020040997339998801002008000020016000020040200401180201100991001008000010000051104161120037800001002004120041200412004120041
8020420040150364225801001008000010080000500640000200212004020040997339998801002008000020016000020040200401180201100991001008000010000051101161120037800001002004120041200412004120041
802042004015004225801001008000010080000500640000200212004020040997339998801002008000020016000020040200401180201100991001008000010000051101161120037800001002004120041200412004120041
802042004015004225801001008000010080000500640000200212004020040997339998801002008000020016000020040200401180201100991001008000010000051101161120037800001002004120041200412004120041
8020420040150013725801001008000010080000500640000200212004020040997339998801002008000020016000020040200401180201100991001008000010000051101161120037800001002004120041200412004120041
802042004015004225801001008000010080000500640000200212004020040997339998801002008000020016000020040200401180201100991001008000010000051101161120037800001002004120041200412004120041
802042004015004225801001008000010080000500640000200212004020040997339998801002008000020016000020040200401180201100991001008000010000051101161120037800001002004120041200412004120041
8020420040150214225801001008000010080000500640000200212004020040997339998801002008000020016000020040200401180201100991001008000010000051101161120037800001002004120041200412004120041
802042004015004225801001008000010080000500640000200212004020040997339998801002008000020016000020040200401180201100991001008000010000051101161120037800001002004120041200412004120041

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)0318191e1f3f51schedule 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)a9acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
8002420049150003004125800101080000108000050640000120021200402004099963100208001020800002016000020040200401180021109101080000100000050202116652003780000102004120041200412004120041
80024200401500000412580010108000010800005064000002002120040200409996310020800102080000201600002004020040118002110910108000010000005020716772003780000102004120041200412004120041
80024200401500000412580010108000010800005064000002002120040200409996310020800102080000201600002004020040118002110910108000010010005020716652003780000102004120041200412004120041
800242004015000004161800101080302108010750640000020021200402004099963100208001020800002016000020040200401180021109101080000100000050201116742003780000102004120041200412004120041
80024200401500000412580010108000010800005064000002002120040200409996310020800102080000201600002004020040118002110910108000010000005020516642003780000102004120041200412004120041
800242004015000004125800101080000108000050640000020021200402004099963100208001020800002016000020040200401180021109101080000100000050205164122003780000102004120041200412004120041
800242004015000004125800101080000108000050640000020021200402004099962610020800102080000201600002004020040118002110910108000010000005020516542003780000102004120041200412004120041
800242004015000150412580010108000010800005064000002002120040200409996310020800102080000201600002004020040118002110910108000010000005020616572003780000102004120041200412004120041
800242004015000002312580010108000010800005064000002002120040200409996310020800102080000201600002004020040118002110910108000010000005020616742003780000102004120041200412004120041
80024200401500000412580010108000010800005064000002002120040200409996310020800102080000201600002004020040118002110910108000010000005020516642003780000102004120041200412004120041