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

UQSHL (immediate, vector, 8B)

Test 1: uops

Code:

  uqshl v0.8b, v0.8b, #3
  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 instruction (07)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)daddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
100420371500611686251000100010002645211201820372037157131895100010001000203720371110011000000732160221786100020382038203820382038
100420371500611686251000100010002645211201820372037157131895100010001000203720371110011000000733160221786100020382038203820382038
100420371510611686251000100010002645210201820372037157131895100010001000203720371110011000000733160221786100020382038203820382038
100420371510611686251000100010002645210201820372037157031914100010001000203720371110011000000732160221786100020382038203820382038
100420371500611686251000100010002645210201820372037157131895100010001000203720371110011000000732160321786100020382038203820382038
1004203715001551686251000100010002645210201820372037157131895100010001000203720371110011000000733160221786100020382038203820382038
100420371500611686251000100010002645211201820372037157131895100010001000203720371110011000000732160221786100020382038203820382038
100420371500611686251000100010002645211201820372037157131895100010001000203720371110011000000732160221786100020382038203820382038
100420371500611686251000100010002645210201820372037157131895100010001000203720371110011000000732160221786100020382038203820382038
100420371600611686251000100010002645211201820372037157131895100010001000203720371110011000000732160331786100020382038203820382038

Test 2: Latency 1->2

Code:

  uqshl v0.8b, v0.8b, #3
  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 data (08)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)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 tlb miss (a1)ld unit uop (a6)l1d cache writeback (a8)a9acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
10204200371500000000611968610110100122100001001000050028475211200182003720037184210318745101002001000020010000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
1020420037150000000061196862510100100100001001000050028475211200182003720037184210318745101002001000020010000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371500000000830196862510100100100001001000050028475211200182003720037184210318745101002001000020010000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371500000000284196862510100100100001001000050028475210200182003720037184210318745101002001000020010000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
1020420037150000000061196862510100100100001001000050028475210200182003720037184250318745101002001000020010000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
1020420037150000000061196862510100100100001001000050028475210200182003720037184210318745101002001000020010000200372003711102011009910010010000100100000071011611197910100001002003820038200382003820038
1020420037150000060061196862510100100100001001000050028475210200182003720037184210318745101002001000020010000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
1020420037150000000061196862510100100100001001000050028475211200182003720037184210318745101002001000020010000200372003711102011009910010010000100000003071011611197910100001002003820038200382003820038
1020420084150000090061196862510100100100001001000050028475211200182003720037184210318745101002001000020010000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
1020420037150000000061196862510100100100001001000050028475210200182003720037184210318745101002001000020010000200372003711102011009910010010000100000000071021611197910100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

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 cache writeback (a8)acbranch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
1002420037150014519686251001010100001010000502847521120018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
100242003715008419686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
1002420037150126119686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
1002420037150053619686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000640216421978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  uqshl v0.8b, v8.8b, #3
  uqshl v1.8b, v8.8b, #3
  uqshl v2.8b, v8.8b, #3
  uqshl v3.8b, v8.8b, #3
  uqshl v4.8b, v8.8b, #3
  uqshl v5.8b, v8.8b, #3
  uqshl v6.8b, v8.8b, #3
  uqshl v7.8b, v8.8b, #3
  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)031e1f3f51schedule 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)9fld unit uop (a6)l1d cache writeback (a8)a9c2branch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfmap dispatch bubble (d6)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
8020420059150240292580108100800081008002050064013212001920038200389977069989801202008003220080032200382003811802011009910010080000100000011151181620035800001002003920039200392003920039
80204200381502941322192580108100800081008002050064013212001920038200389977069989801202008003220080032200382003811802011009910010080000100000011151181620035800001002003920039200392003920039
802042003815000292580108100800081008002050064013212001920038200389977069989801202008003220080032200382003811802011009910010080000100000011151181620035800001002003920039200392003920039
802042003815000292580108100800081008002050064013212001920038200389977069989801202008003220080032200382003811802011009910010080000100000011151181620035800001002003920039200392003920039
802042003815000292580108100800081008002050064013212001920038200389977069989801202008003220080032200382003811802011009910010080000100000011151181620035800001002003920039200392003920039
802042003815000292580108100800081008002050064013212001920038200389977069989801202008003220080032200382003811802011009910010080000100000011151351620035800001002003920039200392003920039
802042003815000292580108100800081008002050064013212001920038200389977069989801202008003220080032200382003811802011009910010080000100000011151181620035800001002003920039200392003920039
802042003815000292580108100800081008002050064013212001920038200389977069989801202008003220080032200382003811802011009910010080000100000011151181620035800001002003920039200392003920039
802042003815000292580108100800081008002050064013212001920038200389977069989801202008003220080032200382003811802011009910010080000100000011151181620035800001002003920039200392003920039
802042003815000962580108100800081008002050064013212001920038200389977069989801202008003220080032200382003811802011009910010080000100000011151181620035800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03mmu table walk data (08)09l2 tlb miss instruction (0a)l2 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)5f60696d6emap 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)a9acc2cfd0d2l1i cache miss demand (d3)d5map dispatch bubble (d6)d9dadbddfetch restart (de)e0? int output thing (e9)eaeb? simd retires (ee)? int retires (ef)f5f6f7f8fd
800242005015000000060102258001010800001080000506400000120019200382003899963100188001020800002080000200382003811800211091010800001000010305020000116000112003500080000102003920039200392003920039
800242003815000000021039258001010800001080000506400000120019200382003899963100188001020800002080000200382003811800211091010800001000000005020000116000112003500080000102003920039200392003920039
80024200381500000009039258001010800001080000506400000120019200382003899963100188001020800002080000200382003811800211091010800001000000005020000116000112003500080000102003920039200392003920039
800242003815000000024039258001010800001080000506400000120019200382003899963100188001020800002080000200382003811800211091010800001000000005020000116000112003500080000102003920039200392003920039
800242003815000000090039258001010800001080000506400000120019200382003899963100188001020800002080000200382003811800211091010800001000000005020000116000112003500080000102003920039200392003920039
80024200381500000000039258001010800001080000506400000120019200382003899963100188001020800002080000200382003811800211091010800001000000005020000116000112003500080000102003920039200392003920039
800242003815000000018039258001010800001080000506400000120019200382003899963100188001020800002080000200382003811800211091010800001000000005020000116000112003500080000102003920039200392003920039
8002420038150000000210704258001010800001080000506400000120019200382003899963100188001020800002080000200382003811800211091010800001000000005020000116000112003500080000102003920039200392003920039
800242003815000000036039258001010800001080000506400000120019200382003899963100188001020800002080000200382003811800211091010800001000000005020000116000112003500080000102003920039200392003920039
800242003815000000042039258001010800001080000506400000120019200382003899963100188001020800002080000200382003811800211091010800001000000005020000116000112003500080000102003920039200392003920039