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

UCVTF (scalar, integer, S from X)

Test 1: uops

Code:

  ucvtf s0, x0
  mov x0, 1
  mov x1, 2

(no loop instructions)

1000 unrolls and 1 iteration

Retires: 2.000

Issues: 2.000

Integer unit issues: 0.000

Load/store unit issues: 1.000

SIMD/FP unit issues: 1.000

retire uop (01)cycle (02)03l2 tlb miss instruction (0a)1e3f4f51schedule 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)696d6emap stall dispatch (70)map 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 alu (9a)ld unit uop (a6)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? ldst retires (ed)? simd retires (ee)f5f6f7f8fd
2004376300361025200010001000100010001413222820357376376723109200010001000100010003763761110011000100000732161137310001000377377377377377
2004376300361025200010001000100010001407522820357376376733109200010001000100010003763761110011000100000731161137310001000377377377377377
2004376300361025200010001000100010001407522820357376376723109200010001000100010003763761110011000100000731161137310001000377377377377377
2004376200361025200010001000100010001407522820357376376723109200010001000100010003763761110011000100000731161137310001000377377377377377
2004376300361025200010001000100010001407522820357376376723109200010001000100010003763761110011000100000731161137310001000377377377377377
2004376300361025200010001000100010001407522820357376376723109200010001000100010003763761110011000100000731161137310001000377377377377377
2004376310361025200010001000100010001407522820357376376723109200010001000100010003763761110011000100000731161137310001000377377377377377
2004376300361025200010001000100010001407522820357376376723109200010001000100010003763761110011000100000731161137310001000377377377377377
2004376200361025200010001000100010001407522820357376376723109200010001000100010003763761110011000100000731161137310001000377377377377377
2004376300361025200010001000100010001407522820357376376723109200010001000100010003763761110011000100000731161137610001000377377377377377

Test 2: Latency 1->2 roundtrip

Code:

  ucvtf s0, x0
  fmov x0, d0
  mov x0, 1
  mov x1, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 13.0032

retire uop (01)cycle (02)03091e1f3a3f4f51schedule 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)696b6d6emap stall dispatch (70)map 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 alu (9a)9fl1d tlb access (a0)l1d tlb miss (a1)ld unit uop (a6)l1d cache writeback (a8)acbranch mispred nonspec (cb)cdcfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? ldst retires (ed)? simd retires (ee)? int retires (ef)f5f6f7f8fd
30204130032974000013001711940825401001010020000100001002000010000500621449714802709130013013003213003212546631262403010020010000200002001000020000130073130068112020110099100101001000010000100000000131012162212951910000100001000010100130033130033130033130033130033
30204130032973000013001711945625401001010020000100001002000010000500621449714802709130013013003213003212546631262403010020010000200002001000020000130032130032112020110099100101001000010000100000000131012162212951910000100001000010100130033130033130033130033130033
30204130032973000013001711940825401001010020000100001002000010000500621449714802709130013013003213003212546631262403010020010000200002001000020000130032130032112020110099100101001000010000100000000131012162212951910000100001000010100130033130033130033130033130033
30204130032974000013001711940825401001010020000100001002000010000500621449714802709130013013003213003212546631262403010020010000201312001000020000130035130032112020110099100101001000010000100020000131012162212951910000100001000010100130074130038130034130033130033
30204130032974000013001711940825401001010020000100001002000010000500621449714802709130013013003213003212546631262403010020010000200002001000020000130032130032112020110099100101001000010000100000000131013162212951910000100001000010100130033130033130033130033130033
30204130032974000013001711940825401001010020000100001002000010000500621449714802709130013013003213003212546631262403010020010000200002001000020000130032130032112020110099100101001000010000100000000131012162212951910000100001000010100130033130034130033130038130033
30205130058974000013001711940825401001010020000100001002000010000500621449714802709130013013003213003212546631262403010020010000200002001000020000130032130032112020110099100101001000010000100000600131012162212951910000100001000010100130035130033130033130033130033
30204130032974000013001711940825401001010020000100001002000010000500621449714802709130013013003213003212546631262403010020010000200002001000020128130032130032112020110099100101001000010000100000000131012162112951910000100001000010100130033130033130033130033130033
30204130032974000013001711940825401001010020003100001002000010000500621449714802709130013013003213003512549631262403010020010000200002001000020000130032130032112020110099100101001000010000100000000131012162212951910000100001000010100130071130034130033130033130033
30204130032974000013001711940825401001010020004100001002000010000500621449714802709130013013003213003212546631262403010020010000200002001000020000130032130032112020110099100101001000010000100000010131011162212951910000100001000010100130033130033130033130033130033

1000 unrolls and 10 iterations

Result (median cycles for code): 13.0032

retire uop (01)cycle (02)0318191e1f3f4f51schedule 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 stall dispatch (70)map 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 alu (9a)9fl1d tlb access (a0)ld unit uop (a6)l1d cache writeback (a8)acc2branch cond mispred nonspec (c5)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? ldst retires (ed)? simd retires (ee)? int retires (ef)f5f6f7f8fd
300241300329740000130017119408254001010010200001000010200001000050621449714800528113007701300321300321254893126262300102010000200002010000200001300321300321120021109101001010000100100000300012701161112951910000100001000010010130033130033130033130033130033
3002413003297400210130017119409254001010010200001000010200001000050621449714800528113001301300321300321254893126262300102010000200002010000200001300321300321120021109101001010000100100000000012701161112951910000100001000010010130033130033130033130033130033
300241300329740000130017119408254001010010200001000010200001000050621449714800528113001301300321300321254893126262300102010000200002010000200001300321300321120021109101001010000100100000000012701161112951910000100001000010010130033130033130033130033130034
300241300329740000130017119408254001010010200001000010200001000050621449714800528113001301300321300321254893126262300102010000200002010000200001300321300321120021109101001010000100100000000012701161112951910000100001000010010130033130033130033130033130033
300241300329740700130192119409254001010010200001000610201181004950621449714800528113006201300321300321254913126263300102010120200002010000200001300341300331120021109101001010000100100000300012701161112951910000100001000010010130368130033130036130036130035
3002413003297400270130018119408254001010010200001000010200001000050621449714800528013001801300321300321254893126262300102010000200002010000200001300321300321120021109101001010000100100000000012701160312951910000100001000010010130033130049130033130033130033
300241300329740000130017119408254001010010200001000010200001000050621449714800528013004201300321300321254893126262300102010000200002010000200001300321300321120021109101001010000100100000001012701161112951910000100001000010010130036130035130034130033130033
300241300349740000130017119408254001010010200001000010200001000050621449714800528113009301300321300321254893126262300102010000200002010000200001300321300321120021109101001010000100100000000012701161112951910000100001000010010130519130034130033130291130033
300241300329770000130017119408254001010010200001000010200001000050621449714800528113007401300321300321254893126262300102010000200002010000200001300321300321120021109101001010000100100004000012701161112951910000100001000010010130033130033130033130033130033
300241300329740000130017119408254001010010200001000010200001000050621449714800528113009201300321300321254893126262300102010000200002010000201311300321300321120021109101001010000100100000000012701161112951910000100001000010010130033130033130033130033130033

Test 3: throughput

Count: 8

Code:

  ucvtf s0, x8
  ucvtf s1, x8
  ucvtf s2, x8
  ucvtf s3, x8
  ucvtf s4, x8
  ucvtf s5, x8
  ucvtf s6, x8
  ucvtf s7, x8
  mov x8, 9

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code divided by count): 0.3339

retire uop (01)cycle (02)0318191e3f4f51schedule 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)696d6emap stall dispatch (70)map 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 alu (9a)9fl1d tlb miss (a1)ld unit uop (a6)l1d cache writeback (a8)acbranch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? ldst retires (ed)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1602042670920700026694025160100100800008000010080020800155001168951188416326690267092670966326684216013520080020800202008002080020267092670911802011009910010080000100080000001115117116002670680000800001002671026710267102671026714
1602042670920611026694025160100100800008000010080020800155001168951188416326691267092670966326683116013520080020800202008002080020267092670911802011009910010080000100080000001115117016002670680000800001002671026710267102671026710
1602042670920700026695025160100100800008000010080020800155001168951188416326690267092670966326678516013520080020800202008002080020267132670911802011009910010080000100080000001115117016002670680000800001002671026710267102671026710
1602042670920700026694025160100100800008000010080020800155001168951188416326690267092670966326680016013520080020800202008002080020267092670911802011009910010080000100080000001115117016002671380000800001002671426710267102671026710
1602042671320700026694025160100100800008000010080020800155001168951188416326690267092670966326681216013620080020800202008002080020267092670911802011009910010080000100080000001115117016002670680000800001002671026710267102671026710
1602042670920700926699025160100100800008000010080020800155001168951188416326694267092670966326682216013420080020800202008002080020267142670911802011009910010080000100080000001115183016002670680000800001002671026710267102671026710
1602042670920700026694025160100100800008000010080020800155001168951188416326690267092670966326675116013520080020800202008002080020267092671011802011009910010080000100080000001115117016002670680000800001002671026710267102671026710
1602042670920700026694225160100100800008000010080020800155001168951188416326690267132671366326677816013420080020800202008002080020267092670911802011009910010080000100080000001115117016002670680000800001002671426710267102671026710
1602042671320700026694025160100100800008000010080020800155001168951188416326690267092671366326675516013520080020800202008002080020267092670911802011009910010080000100080000001115117016002670680000800001002671026710267102671026710
1602042670920700026694025160100100800008000010080020800145001168951188416326690267092670966326681816013620080020800202008002080020267092670911802011009910010080000100080000001115117016002670680000800001002671026710267102671026710

1000 unrolls and 10 iterations

Result (median cycles for code divided by count): 0.3339

retire uop (01)cycle (02)03mmu table walk data (08)09l2 tlb miss instruction (0a)l2 tlb miss data (0b)18191e1f3a3f4f51schedule 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 stall dispatch (70)simd prf full (72)map 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 alu (9a)9fl1d tlb access (a0)l1d tlb miss (a1)a5ld unit uop (a6)l1d cache writeback (a8)a9acc2branch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? ldst retires (ed)? simd retires (ee)? int retires (ef)f5f6f7f8fd
160024267102070000000002669402516001010800008000010800008000050116888018840320266902670926709665303668916001020800008000020800008000026709267091180021109101080000100008000000000502011611267068000080000102671026710267102671026710
160024267092070000000002669402516001010800008000010800008000050116862818840320266902670926709665303668916001020800008000020800008000026709267091180021109101080000100008000000000502011611267068000080000102671026710267102671026710
16002426709207000000120026709025160010108000080000108000080000501168880188403202670026715267096653036689160010208000080000208000080000267092670911800211091010800001000080000003005219111521280748000080000102853128588285492854728533
160024280802200000121213326161285327824031631301081430813291081116819585012298471963137028373283692853374162562087887164012208228082286208228081140286992858612180021109101080000100040381562009635205284112411284318000080000102869028202286932869429202
16002428541224001151214555280281920251600101080000800001080000800005011684101884032026690267092670966530366891600102080000800002080000800002670926709118002110910108000010002928117000530800515427921276928000080000102820028199282022804528092
1600242803521811015811917920282116524011623501281170813001081671816025012191171942361027809280392770671814836689160010208000080000208000080000267092681211800211091010800001000378013200300519627011279688000080000102671026710267102671026710
16002426709207100075531704027904146231160532108000080000108000080000501168880188403202669026709267096653381136690160373208000080000208018980192270402688311800211091010800001044748091004350520502011611267068000080000102771326710267102688026713
160024270472101000492649680280320251600101080000800001080000800005011688801884032026690267142671366530366921600102081707807562080189800002670926709118002110910108000010222298000000000502011611267068000080000102671026710267102671026710
1600242670920700000018002669402516001010800008000010800008000050116888018840320266902670926709665303668916001020800008000020800008000026709267091180021109101080000100008000000000502013411267278000080000102671026710267102671026710
160024267092070000000002669402516001010800008000010800008000050116888018840320266902670926709665303668916001020800008000020800008000026709267091180021109101080000100008000000000502011611267068000080000102671026710267102671026710