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, 2S)

Test 1: uops

Code:

  fmulx v0.2s, v0.2s, 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)03mmu table walk data (08)1e3f4e51schedule 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)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
10044037300082340725100010001000531908140184037403732583389510001000200040374037111001100073116113473100040384038403840384038
10044037300061340725100010001000531908140184037403732583389510001000200040374037111001100073116113473100040384038403840384038
10044037300061340725100010001000531908140184037403732583389510001000200040374037111001100073116113473100040384038403840384038
10044037300061340725100010001000531908140184037403732583389510001000200040374037111001100073116113473100040384038403840384038
10044037310061340725100010001000531908140184037403732583389510001000200040374037111001100073116113473100040384038403840384038
10044037300061340725100010001000531908140184037403732583389510001000200040374037111001100073116113473100040384038403840384038
100440373100316340725100010001000531908140184037403732583389510001000200040374037111001100073116113473100040384038403840384038
10044037300082340725100010001000531908140184037403732583389510001000200040374037111001100073135113473100040384038403840384038
10044037300061340725100010001000531908140184037403732583389510001000200040374037111001100073116113473100040384038403840384038
10044037300961340725100010001000531908140184037403732583389510001000200040374037111001100073116113473100040384038403840384038

Test 2: Latency 1->2

Code:

  fmulx v0.2s, v0.2s, 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)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)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
1020440037300000006139407251010010010000100100005005706908140018400374003738115638740101002001000820020016400374003711102011009910010010000100100011171701600394890100001004003840038400384003840038
1020440037300000006139407251010010010000100100005005706908040018400374003738115638740101002001000820020016400374003711102011009910010010000100000011171701600394900100001004003840038400384003840038
1020440037300000006139407251010010010000100100005005706908040018400374003738115638741101002001000820020016400374003711102011009910010010000100000011171701600394890100001004003840038400384003840083
1020440037300000006139407251010010010000100100005005706908040018400374003738115638740101002001000820020016400374003711102011009910010010000100000011171701600394890100001004003840038400384003840038
1020440037300000006139407251010010010000100100005005706908140065400374003738108338745101002001000020020000400374003711102011009910010010000100000000071011611394790100001004003840038400384003840038
1020440037299000006139407251010010010000100100005005706908040018400374003738108338745101002001000020020000400374003711102011009910010010000100000000071011611394790100001004003840038400384003840075
1020440037300000006139398251010010010000100100005005706908040018400374003738108338745101002001000020020000400374003711102011009910010010000100000000071011611394790100001004003840038400384003840038
1020440037300000006139407251010010010000100100005005706908040018400374003738108338745101002001000020020000400374003711102011009910010010000100000000071011611394790100001004003840038400384003840038
1020440037300000006139407251010010010000100100005005706908040018400374003738108338745101002001000020020360400374003711102011009910010010000100000000071011611394790100001004003840038400384003840038
1020440037300000006139407251010010010000100100005005706908140018400374003738108338745101002001000020020000400374003711102011009910010010000100200000071011611394790100001004003840038400384003840038

1000 unrolls and 10 iterations

Result (median cycles for code): 4.0037

retire uop (01)cycle (02)03181e1f3f4e51schedule 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)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)9fl1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
1002440037300000613940725100101010000101000050570690804001840037400373813003387671001020100002020000400374003711100211091010100001000640216223947310000104003840038400384003840038
100244003730003088843940725100101210012101014850570830404001840037400373813507387671029320100002020000400374003711100211091010100001010640216223947310000104022740085400384003840038
1002440037300000613935325100101010000101000050570690804029840037400373813003387671001020109762022258403664036841100211091010100001003640216263969110000104008440038400384008540038
10024400373000006139407251001010100001010000505706908040018400374003738130033876710010201000020200004003740037111002110910101000010027640316323947310000104003840038400384003840038
1002440037300000613940725100101010000101000050570690804001840037400373813003387671001020100002020000400374003711100211091010100001000640216223947310000104003840038400384003840038
1002440037300000613940725100101010000101000050570690804001840037400373813003387671001020100002020000400374003711100211091010100001000640216223947310000104003840038400384003840038
1002440037300000613940725100101010000101000050570690804001840037400373813003387671001020100002020000400374003711100211091010100001000640216223947310000104003840038400384003840038
10024400373000001053940725100101010000101000050570690804001840037400373813003387671001020100002020000400374003711100211091010100001000640216223947310000104003840038400384003840038
1002440037300000613940725100101010000101000050570690804001840037400373813003387671001020100002020000400374003711100211091010100001000640216223947310000104003840038400384003840038
1002440037300000613940725100101010000101000050570690804001840133401323813003387671001020100002020000400374003711100211091010100001000640216223947310000104003840038400384003840038

Test 3: Latency 1->3

Code:

  fmulx v0.2s, v1.2s, 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)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)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 cache writeback (a8)acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
10204400373000000726394072510100100100001001000050057069081400180400374003738108338745101002001000020020000400374003711102011009910010010000100003071011611394790100001004003840038400384003840038
10204400373001000613940725101001001000010010000500570690814001804003740037381083387451010020010000200200004008840037111020110099100100100001000423071011611394790100001004003840038400384003840038
1020440037300000061394072510100100100001001000050057069081400180400374003738108338745101002001000020020000400374003711102011009910010010000100000071011611394790100001004003840038400384003840038
1020440037300000061394072510100100100001001000050057069081400183400374003738108338745101002001000020020000400374003711102011009910010010000100000071011611394790100001004003840038400384003840038
1020440037300000061394072510100100100001001000050057069081400180400374003738108338745101002001000020020000400374003711102011009910010010000100000071011611394790100001004003840038400384003840038
10204400373000000726394072510100100100001001000050057069081400180400374008438108338745101002001000020020000400374003711102011009910010010000100000071011611394790100001004003840038400384003840038
1020440037300000061394072510100100100001001000050057069081400180400374003738108338745101002001000020020000400374003711102011009910010010000100000071011711394795100001004003840038400384003840038
1020440037299000061394072510100100100001001000050057069081400180400374003738108338745101002001000020020000400374003711102011009910010010000100000071011611394790100001004003840038400384003840038
1020440037300000061394072510100100100001001000050057069081400180400374003738108338745101002001000020020000400374003711102011009910010010000100000071011611394790100001004003840038400384003840038
1020440037300000061394072510100100100001001000050057069081400180400374003738108338745101002001000020020000400374003711102011009910010010000100003071011611394790100001004003840038400384013440038

1000 unrolls and 10 iterations

Result (median cycles for code): 4.0037

retire uop (01)cycle (02)03181e1f3a3f4e51schedule 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)9fst unit uop (a7)l1d cache writeback (a8)a9accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
1002440037299000014739407251001010100001010000505706908040018400374003738130338767100102010000202000040037400371110021109101010000100000640416443947310000104003840038400384003840038
1002440037299000018739407251001010100001010000505706908040018400374003738130338767100102010000202000040037400371110021109101010000100000640416433947310000104003840038400384003840038
100244003729900006139407251001010100001010000505706908140018400374003738130338767100102010000202000040037400371110021109101010000100000640416433947310000104003840038400384003840038
1002440037300000051539407251001010100001010000505706908040018400374003738130338767100102010000202000040037400371110021109101010000100000640416433947310000104003840038400384003840038
1002440037300000110339407251001010100001010000505706908040018400374003738130338767100102010000202000040037400371110021109101010000100000640416343947310000104003840038400384003840038
100244003730000006139407251001010100001010000505706908040018400374003738130338767100102010000202000040037400371110021109101010000100000640316443947310000104003840038400384003840038
100244003730000006139407251001010100001010000505706908040018400374003738130338767100102010000202000040037400371110021109101010000100000640416443947310000104003840038400384003840038
100244003730000006139407251001010100001010000505706908040018400374003738130338767100102010000202000040037400371110021109101010000100000640416423947310000104003840038400384003840038
100244003730000006139407251001010100001010000505706908040018400374003738130338767100102010000202000040037400371110021109101010000100000640316343947310000104003840038400384003840038
1002440037300000010539407251001010100001010000505706908040018400374003738130338767100102010000202000040037400371110021109101010000100000640316433947310000104003840038400384003840038

Test 4: throughput

Count: 8

Code:

  fmulx v0.2s, v8.2s, v9.s[1]
  fmulx v1.2s, v8.2s, v9.s[1]
  fmulx v2.2s, v8.2s, v9.s[1]
  fmulx v3.2s, v8.2s, v9.s[1]
  fmulx v4.2s, v8.2s, v9.s[1]
  fmulx v5.2s, v8.2s, v9.s[1]
  fmulx v6.2s, v8.2s, v9.s[1]
  fmulx v7.2s, v8.2s, 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)033f51schedule 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)9fcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
8020420049150952580100100800001008000050064000002002120040200409973399988010020080000200160000200402004011802011009910010080000100511041611200370800001002004120041200412004120041
80204200401504222580100100800001008000050064000002002120040200409973399988010020080000200160000200402004011802011009910010080000100511011611200370800001002004120041200412004120041
8020420040150632580100100800001008000050064000002002120040200409973399988010020080000200160000200402004011802011009910010080000100511011611200370800001002004120041200412004120041
8020420040150422580100100800001008000050064000002002120040200409973399988010020080000200160000200402004011802011009910010080000100511011611200370800001002004120041200412004120041
8020420040150422580100100800001008000050064000002002120040200409973399988010020080000200160000200402004011802011009910010080000100511011610200370800001002004120041200412004120041
8020420040150632580100100800001008000050064000002002120040200409983399988010020080000200160000200402004011802011009910010080000100511011611200370800001002004120041200412004120041
8020420040150862580100100800001008000050064000002002120040200409973399988010020080000200160000200402004021802011009910010080000100511011611200370800001002004120041200412004120041
8020420040150422580100100800001008000050064000002002120040200409973399988010020080000200160000200402004011802011009910010080000100511011611200370800001002004120041200412004120041
8020420040150422580100100800001008000050064000002002120040200409973399988010020080000200160000200402004011802011009910010080000100511011611200370800001002004120041200412004120041
802042004015015125801001008000010080000500640000020021200402004099733999880100200800002001600002004020040118020110099100100800001005110116122003718800001002004120041200412004120041

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03l1i tlb fill (04)mmu table walk data (08)l2 tlb miss data (0b)18191e3a3f51schedule 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 miss (a1)ld unit uop (a6)l1d cache writeback (a8)a9acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)ea? simd retires (ee)? int retires (ef)f5f6f7f8fd
800242004915600000002372580010108000010800005064000020021200402004099963100208001020800002016000020040200401180021109101080000102304144025020516317200370080000102004120041200412004120041
800242004015500000004125800101080000108000050640000200212004020040999631002080010208000020160000200402004011800211091010800001000000050205165202003702080000102004120041200412004120041
800242004015000000002762580010108000010800005064000020021200402004099963100208001020800002016000020040200401180021109101080000100000005020316313200370080000102004120041200412004120041
80024200401500000000412580010108000010800005064000020021200402004099963100208001020800002016000020040200401180021109101080000100000005020516315200370080000102004120041200412004120041
80024200401500000000412580010108000010800005064000020021200402004099963100208001020800002016000020040200401180021109101080000100000005020316518200370080000102004120041200412004120041
80024200401500000000574258001010800001080000506400002002120040200409996310020800102080000201600002004020040118002110910108000010000000502041656200370080000102004120041200412004120041
800242004015000000001462580010108000010800005564000020021200402004099963100208001020800002016000020040200401180021109101080000100000005020316320200370080000102004120041200412004120041
8002420040155000000041258001010800001080000506400002002120040200409996310020800102080000201600002004020040118002110910108000010020297045059540521201180080000102004120041200412004120041
8002420040155000000041258001010800001080000506400002002120040200409996310020800102080000201600002004020040118002110910108000010000000502031637200370080000102004120041200412004120041
80024200401500000000832580010108000010800005064000020021200402004099963100208001020800002016000020040200952180021109101080000100000005020316519200370080000102004120041200412004120041