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, 4H)

Test 1: uops

Code:

  fmul 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 cache writeback (a8)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
10044037300613407251000100010005319081401840374037325833895100010002000403740371110011000073116113473100040384038403840384038
1004403730198613407251000100010005319080401840374037325833895100010002000403740371110011000073116113473100040384038403840384038
10044037300613407251000100010005319080401840374037325833895100010002000403740371110011000073116113473100040384038403840384038
10044037300613407251000100010005319081401840374037325833895100010002000403740371110011000073116113473100040384038403840384038
10044037300613407251000100010005319081401840374037325833895100010002000403740371110011000073116113473100040384038403840384038
10044037300613407251000100010005319081401840374037325833895114810002000403740371110011000073116113473100040384038403840384038
10044037300613407251000100010005319081401840374037325833895100010002000403740371110011000073116113473100040384038403840384038
10044037300613407251000100010005319081401840374037325833895100010002000403740371110011000073116113473100040384038403840384038
10044037300613407251000100010005319080401840374037325833895100010002000403740371110011000073116113473100040384038403840384038
10044037306613407251000100010005319080401840374037325833895100010002000403740371110011000073116113473100040384038403840384038

Test 2: Latency 1->2

Code:

  fmul 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)0318191e3f4e51schedule 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)a9acc2cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1020440037299001211143940725101001001000010010000500570690804001840037400373810833874510100200100002002000040037400371110201100991001001000010000000071011611394790100001004003840038400384003840038
1020440037300000613940725101001001000010010000500570690814001840037400373810833874510100200100002002000040037400371110201100991001001000010000000071011611394790100001004003840038400384003840038
1020440037300000613940725101001001000010010000500570690804001840037400373810833874510100200100002002000040037400371110201100991001001000010000000071011611394790100001004003840038400384003840038
1020440037300000613940725101001001000010010000500570690804001840037400373810833874510100200100002002000040037400371110201100991001001000010000000071011611394790100001004003840038400384003840038
1020440037300000613940725101001001000010010000500570690804001840037400373810833874510100200100002002000040037400371110201100991001001000010000000071011641394980100001004003840038400384003840038
10204400373000006139407251010010010000100100005005706908140018400374003738108338745101002001000020020000400374003711102011009910010010000100000020802273323968628100001004027540464402744046440038
10204400852990006453393891841016214710006100100005005706908040018400374003738108338745101002001000020020000400374003711102011009910010010000100212251850071011611394790100001004003840038400384003840038
1020440037300000613940725101001001000010010000500570690814001840037400373810833874510100200100002002000040037400371110201100991001001000010001030071011711394790100001004003840038400384003840038
1020440037300000613940725101001001000010010000500570690804001840037400373810833874510100200100002002000040037400371110201100991001001000010000000071011611394790100001004003840038400384003840038
1020440037300000613940725101001001000010010000500570690804001840037400373810833874510100200100002002000040037400371110201100991001001000010000000071011611394790100001004003840038400384003840038

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)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 tlb access (a0)l1d cache writeback (a8)accdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
10024400373000613940725100101010000101000050570690804001840037400373813003387671001020100002020000400374003711100211091010100001000006404162239473010000104003840038400384003840038
10024400373000613940725100101010000101000050570690814001840037400373813003387671001020100002220000400374003711100211091010100001000006402162239473010000104003840038400384003840038
10024400373000613940725100101010000101000050570690814001840037400373813003387671001020100002020000400374003711100211091010100001000006402162239473010000104003840038400384003840038
10024400373000613940725100101010000101000050570690804001840037400373813003387671001020100002020000400374003711100211091010100001000006402162239473010000104013240085400384003840038
1002440037300016839407251001014100301210296665706908040018400374003738130012387861001020100002020000400374003711100211091010100001040006402162239512310000104003840038400384003840038
10024400373000613940725100101010000101000050570690804001840037400373813403387671001020100002020000400374003711100211091010100001000006402162239473010000104003840038400384003840038
100244003730024613940725100101010000101000050570690814001840037400373813003387671001020100002020000400374003711100211091010100001000006402162239473010000104003840038400384003840038
10024400372990613940725100101010000101000050570690804001840037400373813003387671001020100002020000400374003711100211091010100001000006402163239473010000104003840038400384003840038
10024400372990613940725100101010000101000050570690814001840037400373813003387671001020100002020000400374003711100211091010100001000006402162239473010000104003840038400384003840038
10024400372990613940725100101010000101000050570690804001840037400373813003387671001020100002020000400374003711100211091010100001000006402162239473010000104003840038400384003840038

Test 3: Latency 1->3

Code:

  fmul 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)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)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)accfd0d2d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1020440037299061394072510100100100001001000050057069080540018400374003738108338745101002001000020020000400374003711102011009910010010000100007100011611394790100001004003840038400384003840038
1020440037300082394072510100100100001001000050057069081040018400374003738108338745101002001000020020000400374003711102011009910010010000100007100011631394790100001004003840038400384003840038
1020440037299061394072510100100100001001000050057069081540018400374003738108338745101002001000020020000400374003711102011009910010010000100007100011611394790100001004003840038400384003840038
1020440037300061394072510100100100001001000050057069080040018400374003738108338745101002001000020020000400374003711102011009910010010000100007100011611394790100001004003840038400384003840038
1020440037300061394072510100100100001001000050057069081540018400374003738108338745101002001000020020000400374003711102011009910010010000100007105111611394790100001004003840038400384003840038
10204400373000143394072510100100100001001000050057069080040018400374003738108338745101002001000020020000400374003711102011009910010010000100007100011611394790100001004003840038400384003840038
1020440037300061394072510100100100001001000050057069080040018400374003738108338745101002001000020020000400374003711102011009910010010000100007100011631394790100001004003840038400384003840038
1020440037299061394072510100100100001001000050057069080040018400374003738108338745101002001000020020000400374003711102021009910010010000100007105111611394790100001004003840038400384003840038
1020440037300061394072510100100100001001000050057069081540018400374003738108338745101002001000020020000400374003711102011009910010010000100007100011611394790100001004003840038400384003840038
1020440037300061394072510100100100001001000050057069081540018400374003738108338745101002001000020020000400374003711102011009910010010000100007105111611394790100001004003840038400384003840038

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)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)acbranch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
10024400373009823939843100181010006101000050570690840018400374003738130338804100102010000202000040037400372110021109101010000100000640216223947310000104003840038400384003840038
10024400373000613940725100101010000101000050570690840018400374003738130338767100102010000202000040037400371110021109101010000100001640216223947310000104003840038400384003840038
10024400373000613940725100101010000101000050570690840018400374003738130338767100102010000202000040037402261110021109101010000100000640216223947310000104003840038400384003840038
100244003730007263940725100101010000101000050570690840018400374003738130338767100102010000202000040037400371110021109101010000100000640216223947310000104003840038400384003840038
10024400373000613940725100101010000101000050570690840018400804003738130338767100102010000202000040037400371110021109101010000100000640216223947310000104003840038400384003840038
10024400373000613940725100101010000101000050570690840018400374003738130338767100102010000202000040037400371110021109101010000100000640216223947310000104003840038400384003840038
10024400373000613940725100101010000101000050570690840018400374003738130338767100102010000202000040037400371110021109101010000100000640216223947310000104003840038400384003840038
10024400373000613940725100101010000101000050570690840018400374003738130338767100102010000202000040037400371110021109101010000100000640316223947310000104003840038400384003840038
100244003730004313940725100101010000101000050570690840018400374003738130338767100102010000202000040037400371110021109101010000100000640216223947310000104003840038400384003840038
10024400373000613940725100101010000101000050570690840018400374003738130338767100102010000202000040037400371110021109101010000100000640216223947310000104003840038400384003840038

Test 4: throughput

Count: 8

Code:

  fmul v0.4h, v8.4h, v9.h[1]
  fmul v1.4h, v8.4h, v9.h[1]
  fmul v2.4h, v8.4h, v9.h[1]
  fmul v3.4h, v8.4h, v9.h[1]
  fmul v4.4h, v8.4h, v9.h[1]
  fmul v5.4h, v8.4h, v9.h[1]
  fmul v6.4h, v8.4h, v9.h[1]
  fmul 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)03l2 tlb miss data (0b)18191e1f3f51schedule 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)l1d cache writeback (a8)a9acbranch 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
802042005915000000312580108100800081008002050064013212002102004020040997769991801202008003220016006420040200401180201100991001008000010000000111511811600200370800001002004120041200412004120041
802042004015000000312580108100800081008002050064013212002102004020040997769991801202008003220016006420040200401180201100991001008000010000000111511801600200370800001002004120041200412004120041
802042004015000000312580100100800001008000050064000012002102004020040997339998801002008000020016000020040200401180201100991001008000010000000000511011611200370800001002004120041200412004120041
8020420040150000006032580100100800001008000050064000002002132004020040997339998801002008000020016000020040200401180201100991001008000010000000000511011611200370800001002004120041200412004120041
8020420040150000005172580100100800001008000050064000012008202010420040997339998801002008000020016000020040200401180201100991001008000010000000000511011611200370800001002004120041200412004120041
8020420040150000001262580100100800001008000050064000002002102004020040997339998801002008000020016000020040200401180201100991001008000010000000000511011611200370800001002004120041200412004120041
8020420040150000002962580100100800001008000050064000012002102004020040997339998801002008000020016000020040200401180201100991001008000010000000000511011611200370800001002004120041200412004120041
802042004015000000422580100100800001008000050064000012002102004020040997339998801002008000020016000020040200401180201100991001008000010000000000511011611200370800001002004120041200412004120041
802042004015000000422580100100800001008000050064000002002102004020040997339998801002008000020016000020040200401180201100991001008000010000000000511011612200370800001002004120041200412004120041
802042004015000000422580100100800001008000050064000012002102004020040997339998801002008000020016000020040200401180201100991001008000010000000000511011611200370800001002004120041200412004120041

1000 unrolls and 10 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)acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
800242004915094125800101080000108000050640000020021200402004099963100208001020800002016000020040200401180021109101080000100005020116112003780000102004120041200412004120041
800242004015004125800101080000108000050640000020021200402004099963100208001020800002016000020040200401180021109101080000100005020116112003780000102004120041200412004120041
800242004015004125800101080000108000050640000020021200402004099963100208001020800002016000020040200401180021109101080000100005020116122003780000102004120041200412004120041
800242004015004125800101080000108000050640000020021200402004099963100208001020800002016000020040200401180021109101080000100005020116112003780000102004120041200412004120041
800242004015004125800101080000108000050640000020021200402004099963100208001020800002016000020040200401180021109101080000100005020116112003780000102004120041200412004120041
800242004015064125800101080000108000050640000020021200402004099963100208001020800002016000020040200401180021109101080000100005020116112003780000102004120041200412004120041
800242004015004125800101080000108000050640000020021200402004099963100208001020800002016000020040200401180021109101080000100005020116112003780000102004120041200412004120041
8002420040150154125800101080000108000050640000020021200402004099963100208001020800002016000020040200401180021109101080000100005020116112003780000102004120041200412004120041
800242004015004125800101080000108000050640000020021200402004099963100208001020800002016000020040200401180021109101080000100005020116112003780000102004120041200412004120041
800242004015004125800101080000108000050640000020021200402004099963100208001020800002016000020040200401180021109101080000100005020116112003780000102004120041200412004120041