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, 2D)

Test 1: uops

Code:

  fmulx v0.2d, v0.2d, v1.d[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 access (a0)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
10044037304561340725100010001000531908140184037403732583389510001000200040374037111001100001073116113473100040384038403840384038
1004403730061340725100010001000531908140184037403732583389510001000200040374037111001100000073116113473100040384038403840384038
10044037301561340725100010001000531908140184037403732583389510001000200040374037111001100000073116113473100040384038403840384038
1004403730061340725100010001000531908140184037403732583389510001000200040374037111001100000073116113473100040384038403840384038
10044037300124340725100010001000531908140184037403732583389510001000200040374037111001100000073116113473100040384038403840384038
10044037300216340725100010001000531908140184037403732583389510001000200040374037111001100020073116113473100040384038403840384038
100440373022261340725100010001000531908140184037403732583389510001000200040374037111001100000073116113473100040384038403840384038
1004403730061340725100010001000531908140184037403732583389510001000200040374037111001100000073116113473100040384038403840384038
10044037300103340725100010001000531908140184037403732583389510001000200040374037111001100000073116113473100040384038403840384038
1004403730061340725100010001000531908140184037403732583389510001000200040374037111001100000073116113473100040384038403840384038

Test 2: Latency 1->2

Code:

  fmulx v0.2d, v0.2d, v1.d[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)1e3f4e51schedule 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)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
1020440037313006139407251010010010000100100005005706908140018400374003738108338745101002001000020020000400374003711102011009910010010000100007101161139479100001004003840038400384003840038
1020440037300006139407251010010010000100100005005706908140018400374003738108338745101002001000020420000400374003711102011009910010010000100007101161139479100001004003840038400384003840038
10204400372990019339407251010010010000100100005005706908140018400374003738108338745101002001000020020000400374003711102011009910010010000100007101161139479100001004003840038400384003840038
1020440037300006139407251010010010000100100005005706908140018400374003738108338745101002001000020020000400374003711102011009910010010000100007101161139479100001004003840038400384003840038
1020440037300006139407251010010010000100100005005706908140018400374003738108338745101002001000020020000400374003711102011009910010010000100007101161139479100001004003840038400384003840038
10204400373001074739407251010010010000100100005005706908140018400374003738108338745101002001000020020000400374003711102011009910010010000100007101161139479100001004003840038400384003840038
1020440037300006139407431010010010000100100005005706908140018400374003738108338745101002001000020020000400374003711102011009910010010000100007101161139479100001004003840038400384003840038
1020440037300006139407251010010010000100100005005706908140018400374003738108338765101002001000020020000400374003711102011009910010010000100007101161139479100001004003840038400384003840038
1020440037300006139407251010010010000100100005005706908140018400374003738108338745101002001000020020000400374003711102011009910010010000100007101161139479100001004003840038400384003840038
1020440037300006139407251010010010000100100005005706908140018400374003738108338745101002001000020020000400374003711102011009910010010000100007101161139479100001004003840038400384003840038

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)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)st unit uop (a7)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
100244003730006139407251001010100001010000505706908040018400374003738130338767100102010000202000040037400371110021109101010000100010640316223947310000104003840038400384003840038
100244003730006139407251001010100001010000505706908040018400374003738130338767100102010000202000040037400371110021109101010000100020640216223947310000104003840038400384003840038
1002440037300061394072510010101000010100005057069080400184003740037381303387671001020100002020000400374003711100211091010100001000584640216223947310000104003840038400854003840038
1002440037300012639407251001010100001010000505706908140018400374003738130338767100102010000202000040037400371110021109101010000100033640216223947310000104003840038400384003840038
100244003730006139407251001010100001010000505706908040018400374003738130338767100102010000202000040037400371110021109101010000100010640216223947310000104003840038400384003840038
100244003730006139407251001010100001010000505706908040018400374003738130338767100102010000202000040037400371110021109101010000100030640216223947310000104003840038400384003840038
100244003730006139407251001010100001010000505706908040018400374003738130338767100102010000202000040037400371110021109101010000100030640216223947310000104003840038400384003840038
100244003730006139407251001010100001010000505706908140018400374003738130338767100102010000202000040037400371110021109101010000100013640216223947310000104003840038400384003840038
100244003730006139407251001010100001010000505706908040018400374003738130338767100102010000202000040037400371110021109101010000100000640216223947310000104003840038400384003840038
1002440037300061394072510010101000010100005057069081400184003740037381303387671001020100002020000400374003711100211091010100001000526640216223947310000104003840086400384003840038

Test 3: Latency 1->3

Code:

  fmulx v0.2d, v1.2d, v0.d[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 tlb access (a0)ld unit uop (a6)st unit uop (a7)l1d cache writeback (a8)a9accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
1020440037300061394072510100100100001001000050057069081400184003740037381083387451010020010000200200004003740037111020110099100100100001000000007102162239479100001004003840038400384003840038
1020440037300061394072510100100100001001000050057069080400184003740037381083387451010020010000200200004003740037111020110099100100100001000003007102162239479100001004003840038400384003840038
1020440037300061394072510100100100001001000050057069081400184003740037381083387451010020010000200200004003740037111020110099100100100001000004007102162239479100001004003840038400384003840038
1020440037299061394072510100100100001001000050057069080400184003740037381083387451010020010000200200004003740037111020110099100100100001000002007102162239479100001004003840038400384008740038
10204400373000536394072510100100100001001000050057069080400184003740037381083387451010020010000200200004003740037111020110099100100100001000000007102162239479100001004003840038400384003840038
1020440037299061394072510100100100001001000050057069080400184003740037381083387451010020010000200200004003740037111020110099100100100001000003007102162239479100001004003840038400384003840038
1020440037300061394072510100100100001001000050057069080400184003740037381083387451010020010000200200004003740037111020110099100100100001000003007102162239479100001004003840038400384003840038
1020440037300061394072510100100100001001000050057069080400184003740037381083387451010020010000200200004003740037111020110099100100100001000004007102162239479100001004003840038400384003840038
1020440037300061394072510100100100001001000050057069080400184003740037381083387451010020010000200200004003740037111020110099100100100001000000037102162239479100001004003840038400384003840038
1020440037300061394072510100100100001001000050057069081400184003740037381083387451010020010000200200004003740037111020110099100100100001000000007102162239479100001004003840038400384003840038

1000 unrolls and 10 iterations

Result (median cycles for code): 4.0037

retire uop (01)cycle (02)03091e3f4e51schedule 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)9fld unit uop (a6)l1d cache writeback (a8)accdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)ea? simd retires (ee)? int retires (ef)f5f6f7f8fd
1002440037300206139407251001010100001010000505706908140018040037400373813033876710010201000020200004003740037111002110910101000010000064021622394733210000104003840038400384003840038
1002440037299006139407251001010100001010000505706908140018040037400373813033876710010201000020200004003740037111002110910101000010000064021622394730010000104003840038400384003840038
1002440037300006139407251001010100001010000505706908140018040037400373813033876710010201000020200004003740037111002110910101000010000064021622394730010000104003840038400384003840038
1002440037299006139407251001010100001010000505706908140018040037400373813033876710010201000020200004003740037111002110910101000010000064021622394730010000104003840038400384003840038
10024400373000061394072510010101000010100005057069081400180400374003738130338767100102010000202000040037400371110021109101010000100230064021622394730010000104003840085400854008540038
1002440037300006139407251001010100001010000505706908140018040037400373813033876710010201000020200004003740037111002110910101000010000064021622394730010000104003840038400384003840038
1002440037300006139407251001010100001010000505706908140018040037400373813033876710010201000020200004003740037111002110910101000010000064021622394730010000104003840038400384003840038
1002440037300006139407251001010100001010000505706908140018040037400373813033876710010201000020200004003740037111002110910101000010000064022422394730010000104003840038400384003840038
1002440037299006139407251001010100001010000505706908140018040037400373813033876710010201000020200004003740037111002110910101000010000064021622394730010000104003840038400384003840038
1002440037300006139407251001010100001010000505706908140018040037400373813033876710010201000020200004003740037111002110910101000010000064021622394730010000104003840038400384003840038

Test 4: throughput

Count: 8

Code:

  fmulx v0.2d, v8.2d, v9.d[1]
  fmulx v1.2d, v8.2d, v9.d[1]
  fmulx v2.2d, v8.2d, v9.d[1]
  fmulx v3.2d, v8.2d, v9.d[1]
  fmulx v4.2d, v8.2d, v9.d[1]
  fmulx v5.2d, v8.2d, v9.d[1]
  fmulx v6.2d, v8.2d, v9.d[1]
  fmulx v7.2d, v8.2d, v9.d[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)030918191e3f51schedule 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
80204200591500000176258010010080000100800005006400000200210200402004099733999880100200800002001600002004020040118020110099100100800001000051103163220037800001002004120041200412004120090
8020420040150000042258010010080000100800005006400000200210200402004099733999880100200800002001600002004020040118020110099100100800001000351103162320037800001002004120041200412004120041
8020420040150000042258010010080000100800005006400000200210200402004099733999880100200800002001600002004020040118020110099100100800001000051102162320037800001002004120041200412004120041
8020420040150000042258010010080000100800005006400001200210200402004099733999880100200800002001600002004020040118020110099100100800001000051102162320037800001002004120041200412004120041
8020420040150000042258010010080000100800005006400000200210200402004099733999880100200800002001600002004020040118020110099100100800001000051102162320037800001002004120041200412004120041
8020420040150000042258010010080000100800005006400000200210200402004099733999880100200800002001600002004020040118020110099100100800001000051102162120037800001002004120041200412004120041
8020420040150000063258010010080000100800005006400000200210200402004099733999880100200800002001600002004020040118020110099100100800001000051102162320037800001002004120041200412004120041
8020420040150000042258010010080000100800005006400000200210200402004099733999880100200800002001600002004020040118020110099100100800001000051102163220037800001002004120041200412004120041
80204200401500000411258010010080000100800005006400000200210200402004099733999880100200800002001600002004020040118020110099100100800001000051102163320037800001002004120041200412004120041
8020420040150000042258010010080000100800005006400000200210200402004099733999880100200800002001600002004020040118020110099100100800001000051103163220037800001002004120041200412004120041

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03mmu table walk instruction (07)l2 tlb miss instruction (0a)1e3a3f51schedule 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)9fa9acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
8002420049150110248258001010800001080000506400002002120040200409996310020800102080000201600002004020040118002110910108000010000502419219162003780000102004120041200412004120041
80024200401501102482580010108000010800005064000020021200402004099963100208001020800002016000020040200401180021109101080000100005024171613162003780000102004120041200412004120041
80024200401501102482580010108000010800005064000020021200402004099963100208001020800002016000020040200401180021109101080000100005024171620172003780000102004120041200412004120041
80024200401501102482580010108000010800005064000020021200402004099963100208001020800002016000020040200401180021109101080000100005024151616172003780000102004120041200412004120041
80024200401501102482580010108000010800005064000020021200402004099963100208001020800002016000020040200401180021109101080000100005024141619162003780000102004120041200412004120041
80024200401501102482580010108000010800005064000020021200402004099963100208001020800002016000020040200401180021109101080000100005024161613142003780000102004120041200412004120041
8002420040150110248258001010800001080000506400002002120040200409996310020800102080000201600002004020040118002110910108000010000502491616172003780000102004120041200412004120041
80024200401501102582580010108000010800005064000020021200402004099963100208001020800002016000020040200401180021109101080000100005024141616162003780000102004120041200412004120041
80024200401501102692580010108000010800005064000020021200402004099963100208001020800002016000020040200401180021109101080000100305024161617162003780000102004120041200412004120041
80024200401501102482580010108000010800005064000020021200402004099963100208001020800002016000020040200401180021109101080000100005024161614182003780000102004120041200412004120041