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

UXTL (4S)

Test 1: uops

Code:

  uxtl v0.4s, v0.4h
  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)l1d cache writeback (a8)acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
10042037160061168625100010001000264521020182037203715713189510001000100020372037111001100000073316111854100020382038203820382038
10042037160061168625100010001000264521020182037203715713189510001000100020372037111001100000073116111786100020382038203820862038
10042037160061168625100010001000264521020182037203715713189510001000100020372037111001100000273116111786100020382038203820382038
10042037150061168625100010001000264521020182037203715713189510001000100020372037111001100000073116111786100020382038203820382038
10042037160061168625100010001000264521020182037203715713189510001000100020372037111001100000073116111786100020382038203820382038
10042037160061168625100010001000264521020182037203715713189510001000100020372037111001100000073116111786100020382038203820382038
100420371600233168625100010001000264521020182037203715713189510001000100020372037111001100000073116111786100020382038203820382038
10042037150061168625100010001000264521020182037203715713189510001000100020372037111001100010073116111786100020382038203820382038
10042037160061168625100010001000264521120182037203715713189510001000100020372037111001100000073116111786100020382038203820382038
10042037150061168625100010001000264521120182037203715713189510001000100020372037111001100000073116111786100020382038203820382038

Test 2: Latency 1->2

Code:

  uxtl v0.4s, v0.4h
  movi v0.16b, 1
  movi v1.16b, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 2.0037

retire uop (01)cycle (02)03mmu table walk instruction (07)mmu table walk data (08)l2 tlb miss instruction (0a)l2 tlb miss data (0b)18191e1f3a3f4e51schedule 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)l1d tlb miss (a1)ld unit uop (a6)st unit uop (a7)l1d cache writeback (a8)a9acc2branch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
102042003715500000000014519686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100000000300071021622197910100001002003820038200382003820038
10204200371550000000006119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100000000000071021622197910100001002003820038200382003820038
10204200371550000000008419686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100000000000071021622197910100001002003820038200382003820038
10204200371550000000006119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100000000000071021622197910100001002003820038200382003820038
10204200371560000000006119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100000000000071021622197910100001002003820038200382003820038
102042003715500000000010319686251010010010000100100005002848785020018200372003718421318745101002001000020010000200372003711102011009910010010000100000000000071021622197910100001002003820038200382003820038
102042003715500000012006119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100000000000071021622197910100001002003820038200382003820038
10204200371550000000006119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100000000000071021622197910100001002003820038200382003820038
102042003715500000000083119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100000000000071021622197910100001002003820038200382003820038
102042003716100000000011019686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100000000000071021622197910100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

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)9fl1d tlb miss (a1)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1002420037156002141968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010006402162319786010000102003820038200382003820038
100242003715500611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010006402162219786010000102003820038200382003820038
100242003715500611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010006402162319786010000102003820038200382003820038
1002420037155001031968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010006402162219786010000102003820038200382003820038
100242003715600611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010006402162219786010000102003820038200382003820038
100242003715600611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010006402162219786010000102003820038200382003820038
10024200371560017241968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010006402162219786010000102003820038200382003820038
1002420037156002511968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010006402162219786010000102003820038200382003820038
100242003715500611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010006402162319786010000102003820038200382003820038
100242003715500611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010006402162319786010000102003820085200382003820038

Test 3: throughput

Count: 8

Code:

  uxtl v0.4s, v8.4h
  uxtl v1.4s, v8.4h
  uxtl v2.4s, v8.4h
  uxtl v3.4s, v8.4h
  uxtl v4.4s, v8.4h
  uxtl v5.4s, v8.4h
  uxtl v6.4s, v8.4h
  uxtl v7.4s, v8.4h
  movi v8.16b, 9

(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)03mmu table walk data (08)l2 tlb miss data (0b)18191e1f3a3f51schedule 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)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
802042003815600000005992580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001000000000111511801600200350800001002003920039200392003920039
802042003815600000005192580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001000000000111511801600200350800001002003920039200392003920039
80204200381560000000292580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001000000000111511801600200350800001002003920039200392003920039
802042003815500000001412580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001000000000111511801600200350800001002003920039200392003920039
80204200381550000000292580172100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001000000000111511801600200350800001002003920039200392003920039
80204200381550000000292580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001000000000111511805900200350800001002003920039200392003920039
80204200381550000000292580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001000000000111511801600200350800001002003920039200392003920039
802042003815500000005992580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001000000000111511801600200350800001002003920039200392003920039
80204200381550000000292580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001000000000111511801600200350800001002003920039200392003920039
80204200381550000000292580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001000000000111511801600200350800001002003920039200392003920039

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)mmu table walk data (08)09l2 tlb miss data (0b)0f18191e1f3a3f51schedule 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)l1d tlb miss (a1)ld unit uop (a6)st unit uop (a7)l1d cache writeback (a8)a9acc2cfd2l1i cache miss demand (d3)d5map dispatch bubble (d6)d9ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
800242003915500000000008125800101080000108000050640000020135202392024499962210018800102080000208000020038200381180021109101080000100020122048051100047641320229080000102029620290202872023720290
80024202871570101055669352119332580010108000010800005064000002001920038200389996310018800102080000208000020038200381180021109101080000100000000250920035901320307080000102023920238202882029120240
800242023915701000456723520671428048010804671080580506415480200572028420292100382610127806002080584208058520288202863180021109101080000102220042325051250027002220229080000102033820293202942029020345
80024202911572001056669440032442580010108000010800005064000012001920038200389996310018800102080000208000020038200381180021109101080000100000200050890018821220154080000102035020338202882033720380
80024203431580000036936616031841598075310805641080585506446161202122038820399100563910202806932080779208068020391203918180021109101080000100002003278050200011601120035080000102003920039200392008920193
80024202881570101035660528016162580010108000010800005064000012001920038200389996310018800102080000208000020038200381180021109101080000100000021178051400028601120035080000102003920039200392003920039
800242003815500000007921760120713880290108056210804865064076802001920038200389996310018800102080000208000020038200381180021109101080000100000002325050200011629420035180000102029220243203432039420451
800242014116201010841056440016631428029010805601080194506462100200192003820038999631001880010208000020800002003820038118002110910108000010200000470050200011601120035080000102003920039200392003920039
80024200381600000000000392580010108000010800005064000012001920038200389996310018800102080000208000020038200381180021109101080000100000000050200011601120035080000102003920039200392003920039
80024200381550000000000392580010108000010800005064000012001920038200389996310018800102080000208000020038200381180021109101080000100000000050200011601120035080000102003920039200392003920039