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

FMULX (by element, 4H)

Test 1: uops

Code:

  fmulx v0.4h, v0.4h, v1.h[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 tlb miss (a1)l1d cache writeback (a8)a9accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
10044037300613407251000100010005319081401840374037325833895100010002000403740371110011000000073116113473100040384038403840384038
10044037300613407251000100010005319081401840374037325833895100010002000403740371110011000000073116113473100040384038403840384038
10044037300613407251000100010005319081401840374037325833895100010002000403740371110011000000073116113473100040384038403840384038
10044037310613407251000100010005319081401840374037325833895100010002000403740371110011000000073116113473100040384038403840384038
10044037300613407251000100010005319081401840374037325833895100010002000403740371110011000030073116113473100040384038403840384038
10044037300993407251000100010005319081401840374037325833895100010002000403740371110011000000073116113473100040384038403840384038
100440373045613407251000100010005319081401840374037325833895100010002000403740371110011000014073116113473100040384038403840384038
10044037300613407251000100010005319081401840374037325833895100010002000403740371110011000060073116113473100040384038403840384038
100440373006134072510001000100053190814018403740373258338951000100020004037403711100110000001273116113473100040384038403840384038
10044037300613407251000100010005319081401840374037325833895100010002000403740371110011000000073116113473100040384038403840384038

Test 2: Latency 1->2

Code:

  fmulx v0.4h, v0.4h, v1.h[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)031e3a3f4e51schedule 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)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
10204400373000061394072510100100100001001000050057069080400180400374003738108338745101002001000020020000400374003711102011009910010010000100007101161139479100001004003840038400384003840038
10204400373000061394072510100100100001001000050057069080400180400374003738108338745101002001000020020000400374003711102011009910010010000100007101161139479100001004003840038400384003840038
10204400373000061394072510100100100001001000050057069080400180400374003738108338745101002001000020020000400374003711102011009910010010000100007101161139479100001004003840038400384003840038
10204400373000061394072510100100100001001000050057069080400180400374003738108338745101002001000020020000400374003711102011009910010010000100007101161139479100001004003840038400384003840038
1020440037300117061394072510100100100001001000050057069080400180400374003738108338745101002001000020020000400374003711102011009910010010000100007101161139479100001004003840038400384003840038
10204400372990061394072510100100100001001000050057069080400180400374003738108338745101002001000020020000400374003711102011009910010010000100107101161139479100001004003840038400384003840038
10204400372990061394072510100100100001001000050057069080400180400374003738108338745101002001000020020000400864003711102011009910010010000100007101161139479100001004003840038400384003840038
10204400373000061394072510100100100001001000050057069080400180400374003738108338745101002001000020020000400374003711102011009910010010000100007101161139479100001004003840038400384003840038
10204400372990061394072510100100100001001000050057069080400180400374003738108338745101002001000020020000400374003711102011009910010010000100007101161139479100001004003840038400384003840038
10204400373000061394072510100100100001001000050057069080400180400374003738108338745101002001000020020000400374003711102011009910010010000100007101161139479100001004003840038400384003840038

1000 unrolls and 10 iterations

Result (median cycles for code): 4.0037

retire uop (01)cycle (02)03mmu table walk data (08)181e3f4e51schedule 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 miss (a1)ld unit uop (a6)l1d cache writeback (a8)a9accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
1002440037300000536394072510010101000010100005057069081400184003740037381303387671001020100002020000400374003711100211091010100001000000640316333947310000104003840038400384003840038
100244003730000061394073610010101000010100005057069080400184008340037381303387671001020100002020000400374003711100211091010100001000000640316333947310000104003840038400384003840038
100244003730000061394072510010101000010100005057069080400184003740037381303387671001020100002020000400374003711100211091010100001000000640316333947310000104003840038400384003840038
100244003730000061394072510010101000010100005057069080400184003740037381303387671001020100002020000400374003711100211091010100001000000640316333947310000104003840038400384003840038
100244003730000061394072510010101000010100005057069081400184003740037381303387671001020100002020000400374003711100211091010100001000000640316333947310000104003840038400384003840038
100244003729900061394072510010101000010100005057069081400184003740037381303387671001020100002020000400374003711100211091010100001000000640316333947310000104003840038400384003840038
100244003730000061394072510010101000010100005057069080400184003740037381303387671001020100002020000400374003711100211091010100001000000640316333947310000104003840038400384003840038
100244003730000061394072510010101000010100005057069081400184003740037381303387671001020100002020000400374003711100211091010100001000000640316333947310000104003840038400384003840038
100244003730000061394072510010101000010100005057069081400184003740037381303387671001020100002020000400374003711100211091010100001000000640316333947310000104003840038400384003840038
100244003730000061394072510010101000010100005057069081400184003740037381303387671001020100002020000400374003711100211091010100001000000640316333947310000104003840038400384003840038

Test 3: Latency 1->3

Code:

  fmulx v0.4h, v1.4h, v0.h[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)03mmu table walk instruction (07)mmu table walk data (08)l2 tlb miss instruction (0a)18191e3f4e51schedule 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 tlb access (a0)l1d tlb miss (a1)ld unit uop (a6)l1d cache writeback (a8)a9acc2branch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
102044003730010100061394074410100100100001001000050057083040400180400374003738115638741101002001000820020016400374003711102011009910010010000100000000011171711611394930100001004003840038400384003840038
102044003730010100097394072510100100100001001000050057069080400180400374003738115738740101002001000820020016400374003711102011009910010010000100000000011171711611394930100001004003840038400384003840038
1020440037300101005761394072510100100100001001000050057069080400180400374003738115738741101002001000820020016400374003711102011009910010010000100000000011171711611394930100001004003840038400384003840038
102044003730010100061394072510100100100001001000050057069080400180400374003738115738741101002001000820020016400374003711102011009910010010000100000000011171811611394930100001004003840038400384003840038
102044003730010100061394072510100100100001001000050057069080400180400374003738108338745101002041000020020000400374003721102011009910010010000100000000000071021622394790100001004003840038400384003840038
102044003730000000061394072510100100100001001000050057069080400180400374003738108338745101002001000020020000400374003711102011009910010010000100000000000071021622394790100001004003840038400384003840038
102044003729900000061394072510100100100001001000050057069080400180400374003738108338766101002001000020020000400374003711102011009910010010000100000100000071021622394790100001004003840038400384003840038
102044003730000000061394072510100100100001001000050057069080400180400374003738108338745101002001000020020000400374003711102011009910010010000100000000000071021622394790100001004003840038400384003840038
102044003730000000061394072510100100100001001000050057069080400180400374003738108338745101002001000020020000400374003711102011009910010010000100000000000071021622394790100001004003840038400384003840038
102044003730000100061394072510100100100001001000050057069080400180400374003738108338745101002001000020020000400374003711102011009910010010000100000000000071021622394790100001004003840038400384003840038

1000 unrolls and 10 iterations

Result (median cycles for code): 4.0037

retire uop (01)cycle (02)03191e1f3a3f4e51schedule 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? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
10024400373000108006139407251001010100001010000505706908140018400374003738130338767100102010000202000040037400371110021109101010000100006407162239473010000104008140038400384003840038
1002440037300033006139407251001010100001010000505706908040018400374003738130338767100102010000202000040037400371110021109101010000100006402162239473010000104003840038400384003840038
100244003730006006139407251001010100001010000505706908040018400374003738130338767100102010000202000040037400371110021109101010000100006402162239473010000104003840038400384003840038
100244003730000006139407251001010100001010000505706908140018400374003738130338767100102010000202000040037400371110021109101010000100006402162239473010000104003840038400384003840038
100244003729900008239407251001010100001010000505706908140018400374003738130338767100102010000202000040037400371110021109101010000100006402162239473010000104003840038400384003840038
100244003730006006139407251001010100001010000505706908040018400374003738130338767100102010000202000040037400371110021109101010000100006402162239473010000104003840038400384003840038
100244003730000006139407251001010100001010000505706908040018400374003738130338767100102010000202000040037400371110021109101010000100006402162239473010000104003840038400384003840038
100244003730006006139407251001010100001010000505706908040018400374003738130338767100102010000202000040037400371110021109101010000100006402162239473010000104003840038400384003840038
1002440037300027006139407251001010100001010000505706908140018400374003738130338767100102010000202000040037400371110021109101010000100006402165239473010000104003840038400384003840038
1002440037300015006139407251001010100001010000505706908140018400374003738130338767100102010000202000040037400371110021109101010000100006402162239473010000104003840038400384003840038

Test 4: throughput

Count: 8

Code:

  fmulx v0.4h, v8.4h, v9.h[1]
  fmulx v1.4h, v8.4h, v9.h[1]
  fmulx v2.4h, v8.4h, v9.h[1]
  fmulx v3.4h, v8.4h, v9.h[1]
  fmulx v4.4h, v8.4h, v9.h[1]
  fmulx v5.4h, v8.4h, v9.h[1]
  fmulx v6.4h, v8.4h, v9.h[1]
  fmulx v7.4h, v8.4h, v9.h[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)03091e1f3f51schedule 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)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
80204200601500570422580100100800001008000050064000020021200402004099733999880100200800002001600002004020040118020110099100100800001000051102161120037800001002004120041200412004120041
80204200401500180422580100100800001008000050064000020021200402004099733999880100200800002001600002004020040118020110099100100800001000051101161120037800001002004120041200412004120041
8020420040150000422580100100800001008000050064000020021200402004099733999880100200800002001600002004020040118020110099100100800001000051101161120037800001002004120041200412004120041
8020420040150000422580100100800001008000050064000020021200402004099733999880100200800002001600002004020040118020110099100100800001000051101161120037800001002004120041200412004120041
80204200401500001372580100100800001008000050064000020021200402004099733999880100200800002001600002004020040118020110099100100800001000051101161120037800001002004120041200412004120041
802042004015003450422580100100800001008012050064000020021200402004099733999880100200800002001600002004020040118020110099100100800001000051101161120037800001002004120041200412004120041
8020420040150000422580100100800001008000050064000020021200402004099733999880100200800002001600002004020040118020110099100100800001000051101161120037800001002004120041200412004120041
80204200401500004225801001008000010080000500640000200212004020040997322999880100200800002001600002004020040118020110099100100800001000051101161120037800001002004120041200412004120041
8020420040150000422580100100800001008000050064000020021200402004099733999880100200800002001600002004020040118020110099100100800001000051101161120037800001002004120041200412004120041
80204200401500005172580100100800001008000050064000020021200402004099733999880100200800002001600002004020040118020110099100100800001000051101161120037800001002004120041200412004120041

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)0318191e3f51schedule 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)acbranch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
8002420049150000412580010108000010800005064000020025200402004099963100208001020800002016000020040200401180021109101080000100305020151612122003780000102004120041200412004120041
80024200401500015412580010108000010800005064000020021200402004099963100208001020800002016000020040200401180021109101080000100305038131613132008780000102004120041200412004120041
80024200401500004125800101280101108000050641672200212004020040100073100488001020800002016000020040200401180021109101080000100005020151614172003780000102004120041200412004120041
80024200401500021832580010108000010800005064000020021200402004099963100208001020800002016000020116200402180021109101080000101005020121615152003780000102004120041200412004120041
8002420040150000832580010108000010800005064000020021200402004099963100208001020800002016000020040200401180021109101080000100005020111611112003780000102004120041200412004120041
80024200401500021412580010108000010800005064000020021200402004099963100208001020800002016000020040200401180021109101080000100005020121615162003780000102004120041200412004120041
800242004015000258832580010108000010800005064000020021200402004099963100208001020800002016021420040200401180021109101080000100005020161615152003780000102004120041200412004120041
800242004015000132412580010108000010800005064000020021200402004099963100208001020800002016000020040200401180021109101080000100005020171612162003780000102004120041200412004120041
800242004015003105412580010108000010800005064000020021200402004099963100208001020800002016000020040200401180021109101080000100005020121614152003780000102004120041200412004120041
8002420040150000412580010108000010800005064000020021200402004099963100208001020800002016000020040200401180021109101080000100005020151614162003780000102004120041200412004120041