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

LD4R (4S)

Test 1: uops

Code:

  ld4r { v0.4s, v1.4s, v2.4s, v3.4s }, [x6]
  nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop
  mov x0, 1
  mov x1, 2
  mov x8, 0

(no loop instructions)

1000 unrolls and 1 iteration

Retires (minus 60 nops): 5.000

Issues: 5.008

Integer unit issues: 0.000

Load/store unit issues: 1.000

SIMD/FP unit issues: 4.008

retire uop (01)cycle (02)03l1d tlb fill (05)mmu table walk instruction (07)mmu table walk data (08)09l2 tlb miss instruction (0a)l2 tlb miss data (0b)0e0f1e1f22243a3f464951schedule uop (52)schedule simd uop (54)schedule ldst uop (55)dispatch simd uop (57)dispatch ldst uop (58)simd uops in schedulers (5a)ldst uops in schedulers (5b)5f696d6emap rewind (75)map stall (76)dispatch uop (78)map ldst uop (7d)map simd uop (7e)map ldst uop inputs (80)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst simd load (98)inst ldst (9b)9dl1d tlb access (a0)l1d tlb miss (a1)l1d cache miss ld (a3)ld unit uop (a6)l1d cache writeback (a8)a9acafb5bbl1d cache miss ld nonspec (bf)l1d tlb miss nonspec (c1)c2cfd0d2l1i cache miss demand (d3)l1i tlb miss demand (d4)d5map dispatch bubble (d6)d9dadbddfetch restart (de)e0eaebec? ldst retires (ed)? simd retires (ee)f5f6f7f8fd
65005292842201151114000400046072882100169445008401210004000100050004751042295029091293003105000100040001000400029138291721161001100010001100002100000010002020012974943268513046743201393202381211373728429160021384314647100040002922629316292512925129303
6500429228219016001300020104559287461016977500840081000400010005000475282229312907429256310500010004000100040002920629127116100110001000110000310000001000202001297993356977307833220157301838149333628399164091394914589100040002923629249292422930229240
6500429298219014001800030104549287791116970501240081000400010005000475612229462910329279310500010004000100040002903829130116100110001000010000210000001000212001299593886825309083420193312538137313428320163721381814973100040002929929389291552919029238
6500429237219015001200020004557288060016936501640161000400010005000475815229502909029285310500010004000100040002915329102116100110001000010021310020011000202001275194096845317573920202306138139373628380165001375514802100040002927729268292482929229284
6500429296219013001000020104602288190116980500840121000400010005000476250229172909329262310500010004000100040002911429136116100110001000010000210000001000203001302392546848302983520177306038124403228389162841385514774100040002931029261292332927829335
6500429219220016001400020104559288040017012501240081000400010005000475914229392913829241310500010004000100040002916229182116100110001000010000210010001001212001296794426870309744420190308637398413928414164141396714905100040002926929326292682927029316
650042927821901300200001650104568288301116967500840081000400010005000475081229182913029333310500010004000100040002913429057116100110001000010000210000001000202001287192386849308454220155311438127383728495158271400414678100040002926529300292522932429188
6500429316219013001201020004585288330116961501240161000400010005000476337229532913529306310500010004000100040002917029132116100110001000010000310000001000202001291391896864315293920195309338118393728407156111389714827100040002931429314292472920029334
65004292042190140017000200045252875310170325008401610004000100050004756322291529123292833105000100040001000400029209291921161001100010000100002100000110012030012843922568743010835203003080381310414128321163271402015167100040002920529231291662929529181
6500429187219016001800030004566288360016947500840121000400010005000475392229422910129312310500010004000100040002921629197116100110001000110022210010011000213101291492736827309574020105310038127424128368163201380515126100040002931029328292292921929219

Test 2: throughput

Count: 8

Code:

  ld4r { v0.4s, v1.4s, v2.4s, v3.4s }, [x6]
  ld4r { v0.4s, v1.4s, v2.4s, v3.4s }, [x6]
  ld4r { v0.4s, v1.4s, v2.4s, v3.4s }, [x6]
  ld4r { v0.4s, v1.4s, v2.4s, v3.4s }, [x6]
  ld4r { v0.4s, v1.4s, v2.4s, v3.4s }, [x6]
  ld4r { v0.4s, v1.4s, v2.4s, v3.4s }, [x6]
  ld4r { v0.4s, v1.4s, v2.4s, v3.4s }, [x6]
  ld4r { v0.4s, v1.4s, v2.4s, v3.4s }, [x6]
  mov x7, x6
  mov x8, x6
  mov x9, x6
  mov x10, x6
  mov x11, x6
  mov x12, x6
  mov x13, x6

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code divided by count): 1.0007

retire uop (01)cycle (02)03mmu table walk data (08)0e0f191e1f22243f4346494e51schedule uop (52)schedule int uop (53)schedule simd uop (54)schedule ldst uop (55)dispatch int uop (56)dispatch simd uop (57)dispatch ldst uop (58)int uops in schedulers (59)simd uops in schedulers (5a)ldst uops in schedulers (5b)60696b6d6emap rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map ldst uop (7d)map simd uop (7e)map int uop inputs (7f)map ldst uop inputs (80)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 load (98)inst ldst (9b)9d9fl1d tlb access (a0)l1d cache miss ld (a3)ld unit uop (a6)l1d cache writeback (a8)acafb5b6bbl1d cache miss ld nonspec (bf)branch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0e7eaeb? ldst retires (ed)? simd retires (ee)? int retires (ef)f5f6f7f8fd
400205800705990110200108004216002540011810032006480006100320032800085004000568640272080038080057800576284001402008000832003220080008320032800418004111802011009910010080000800000100800021880015014800026114181115116016008003801010800003200001008004280058800588004280058
4002048005760000002001080042006025400170100320012800061003200328000850040024686402721800380800418005762840014020080008320032200800083200328005780057118020110099100100800008000001008000218800020080015611401115117016008003801010800003200001008005880058800588005880058
4002048005759900002001080026106025400170100320064800061003200328000850040004986402721800380800578005762840014020080008320032200800083200328005780057118020110099100100800008000001008000218800160080016001401115117016008003811010800003200001008005880058800428005880042
4002048004159900001900080042166025400100100320000800001003200008000050040000038400001800380800578004133940010020080000320000200800003200008004180057118020110099100100800008000011008000018800130148001360018000510911711800380100800003200001008004280058800428004280058
4002048005759901101900080026066025400100100320000800001003200008000050040000086400201800220800418005734840010020080000320000200800003200008004180041118020110099100100800008000001008000008000001480013611418000510911711800540100800003200001008004280058800588005880042
400204800575990000190108004206002540016410032006480000100320000800005004000113840000180022080041800573484001002008000032000020080000320000800418005721802011009910010080000800000100800001880014117800006114180005109117118003801010800003200001008005880058800588004280058
400204800415990000000080026166025400100100320000800001003200008000050040001138400001800380800578005734840010020080000320000200800003200008005780057118020110099100100800008000001008000008000001780013010180005109117118005411010800003200001008004280042800588004780058
4002048005760000000000800261600254001641003200008000010032000080000500400011864002018003808005780041348400100200800003200002008000032000080057800571180201100991001008000080000010080000188001401480014611318000510911711800540100800003200001008005880042800588005880058
40020480057599000020010800421660254001001003200008000010032000080000500400011384000018002208005780057339400100200800003200002008000032000080057800571180201100991001008000080000010080000188001401480014611318000510911711800541010800003200001008010880042800588005880047
400204800416000000000080026100025400164100320064800001003200008000050040000986400201800220800418004133940010020080000320000200800003200008004480041118020110099100100800008000001008000008001300800140113180005109117118005411010800003200001008004280042800428005880042

1000 unrolls and 10 iterations

Result (median cycles for code divided by count): 1.0007

retire uop (01)cycle (02)03mmu table walk data (08)090e0f1e1f22243f4346494e51schedule uop (52)schedule int uop (53)schedule simd uop (54)schedule ldst uop (55)dispatch int uop (56)dispatch simd uop (57)dispatch ldst uop (58)int uops in schedulers (59)simd uops in schedulers (5a)ldst uops in schedulers (5b)60696d6emap rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map ldst uop (7d)map simd uop (7e)map int uop inputs (7f)map ldst uop inputs (80)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 load (98)inst ldst (9b)9d9fl1d tlb access (a0)l1d cache miss ld (a3)ld unit uop (a6)l1d cache writeback (a8)acafb5b6bbl1d cache miss ld nonspec (bf)branch mispred nonspec (cb)cfd5map dispatch bubble (d6)dbddfetch restart (de)e0e7eaeb? ldst retires (ed)? simd retires (ee)? int retires (ef)f5f6f7f8fd
40002580057599010013770108004216602540007410320064800001032000080000504000183840000080038800578005733940001020800003200002080000320000800418005711800211091010800008000001080000188001310800006114005019517033800540101080000320000108006180042800588005880042
4000248005760000001901080026060025400086103200648000010320000800005040000086400200800228004180057339400010208000032000020800003200008005780057118002110910108000080000010800001880014014800146114005019417022800541101080000320000108005880058800588005880042
400024800416000000200108004216602540001010320000800001032000080000504000093840000080022800418004133940001020800003200002080000320000800578005711800211091010800008000001080000188001401480014600180501921702380054001080000320000108005880171802758005880058
40002480057600000092801080042106025400074103200008000010320000800005040000038400000800228006080041339400010208000032000020800003200008005780057118002110910108000080000010800001880013125800130114005019217022800541101080000320000108005880058800588005880042
40002480057600000020010800261600254000101032000080000103200008000050400000864002018003880057800573394000102080000320000208000032000080041800571180021109101080000800000108000018800140148001401141805019217022800410101080000320000108010980058800588005880058
400024800575990000898010800421660254000741032006480000103200008000050400015384000008003880057800573394000102080000320000208000032000080041800571180021109101080000800000108000018800130148000061141805019217022800381101080000320000108005880058800588005880058
40002480057599000020010800420660254000101032006480000103200008000050400000864002408003880041800573394000102080000320000208000032000080057800571180021109101080000800000108000008001400800146101805019217023800541101080000320000108004280058801568005880058
40002480057600100019010800421660254000861032007680000103200008000050400018864002008003880057800413394000102080000320000208000032000080041800571180021109101080000800000108000018800130148000060018050193170228005410080000320000108005880155800458005880058
400024800416000000995010800421005025400074103200648000010320000800005040000986400200800388006080057342400010208000032000020800503200008005780142118002110910108000080000010800001880013014800130113180501921702280054101080000320000108005880042800588004280058
40002480041600001094701080026166025400074103200648000010320000800005040001138400000800388005780057339400010208000032000020800003200008005780057118002110910108000080000010800001880000017800140113005019217022800540101080000320000108005880058800428004280045