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, D from W)

Test 1: uops

Code:

  ucvtf d0, w0
  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)031e3f4f51schedule 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)60696d6emap 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)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? ldst retires (ed)? simd retires (ee)f5f6f7f8fd
200437620361025200010001000100010001407522820135737637672311320001000100010001000376376111001100010000731161137310001000377377377377377
200437630361025200010001000100010001407522820035737637672310920001000100010001000376376111001100010000731161137310001000377377377377377
200438030361025200010001000100010001427122820135737637672310920001000100010001000376376111001100010000731161137310001000377377377377377
200437630361025200010001000100010001407522820135737637672310920001000100010001000376376111001100010000731161137310001000377377377377377
200437630361025200010001000100010001407522820135737637672310920001000100010001000376376111001100010000731161137310001000377377377377377
200437630361025200010001000100010001407522820135737637672310920001000100010001000376376111001100010000731161137310001000377377377377377
200437630361025200010001000100010001407522820135737637672310920001000100010001000376376111001100010000731161137310001000377381377377377
200437630361025200010001000100010001407522820135737637672310920001000100010001000376376111001100010000731161137310001000377377377380377
200437920361025200010001000100010001407522820135737637672310920001000100010001000376376111001100010000731161141110001000377377377377377
200437630361025200010001000100010001407522820135737637672310920001000100010001000376376111001100010000731161137310001000377398377377377

Test 2: Latency 1->2 roundtrip

Code:

  ucvtf d0, w0
  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)03l2 tlb miss data (0b)18191e1f3f4f51schedule 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)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)st unit uop (a7)l1d cache writeback (a8)a9acc2branch cond mispred nonspec (c5)branch mispred nonspec (cb)cfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? ldst retires (ed)? simd retires (ee)? int retires (ef)f5f6f7f8fd
302041300329740000013001711940825401001010020000100001002000010000500621449714802709113001313003213003212546631262403010020010000200002001000020000130032130032112020110099100101001000010000100000000000131012162212951910000100001000010100130062130034130065130033130033
302041300329740000013001711940825401001010020000100001002000010000500621449714802709113001313003213003212546631262403010020010000200002001000020000130032130032112020110099100101001000010000100000000000131012162212956510000100001000010100130069130033130061130033130033
302041300329740000013001711940825401001010020000100001002000010000500621449714802709113001313003213011312546631262403010020010000200002001000020000130032130032112020110099100101001000010000100000000000131012162212951910000100001000010100130103130034130108130033130033
302041300329740000013001711940825401001010020000100001002000010000500621449714802709113001313003213003212546631262403010020010000200002001000020000130032130032112020110099100101001000010000100000000000131012162212951910000100001000010100130080130059130033130033130033
302041300329740000013001711940825401001010020000100001002000010000500621449714802709113001313003213003212546631262403010020010000200002001000020000130032130032112020110099100101001000010002100000000000131012162212951910000100001000010100130051130035130033130033130033
302041300329740000013001711940825401001010020000100001002000010000500621449714802709113001313003213003212546631262403010020010000200002001000020000130032130032212020110099100101001000010000100000000000131012162212951910000100001000010100130168130307130119130033130033
302041300329730271068580130017119408254010010100200001000010020000100005006214497148027091130013130032130066125466312624030100200100002000020010000200001300321300321120201100991001010010000100001000005600000131012162212951910000100001000010100130078130035130033130033130033
302041300329740000013001711940825401001010020000100001002000010000500621454514802709113001313003213003212546631262403010020010000200002001000020000130032130032112020110099100101001000010000100000000000131012162212951910000100001000010100130076130036130033130033130033
302041300329730000013001711940825401001010020000100001002000010000500621449714802709113001313003213003212546631262403010020010000200002001000020000130032130032112020110099100101001000010000100000009000131012162212951910000100001000010100130099130033130033130033130033
302041300329740000013001711940825401001010020000100001002000010000500621449714802709113001313003213003212546631262403010020010000200002001000020000130032130032112020110099100101001000010020100000000000131012162212951910000100001000010100130142130034130033130033130033

1000 unrolls and 10 iterations

Result (median cycles for code): 13.0032

retire uop (01)cycle (02)03l2 tlb miss data (0b)18191e1f3f4f51schedule 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)5f60696b6d6emap 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)acc2cdcfd5map dispatch bubble (d6)daddfetch restart (de)e0? int output thing (e9)? ldst retires (ed)? simd retires (ee)? int retires (ef)f5f6f7f8fd
3002413003297400076501300171194082540010100102000010000102000010000506214497148005280113002101300321300321254893126262300102010000201312010000200001300321300321120021109101001010000100100000000127011601112951910000100001000010010130033130038130033130033130033
3002413003297400069901300171194082540010100102000010000102000010000506214497148005280113001301300321300321254893126262300102010000200002010000200001300321300321120021109101001010000100100000001127021601112951910000100001000010010130033130033130033130033130033
3002413003297300048301300171194082540010100102000010000102000010000506214641148005280113001301300321300321254893126309300102010000200002010000200001300321300321120021109101001010000100100000000127011601112951910000100001000010010130033130033130033130033130033
3002413003297400034201300171194082540017100102000010000102000010000506214497148005280013001301300841300361254893126262300102010000200002010000200001300321300321120021109101001010000100100000000127011601112951910000100001000010010130033130033130033130033130033
30024130032974000104701300171194082540010100102000010000102000010000506214497148005280013001301300321300321254893126262300102010000200002010000200001300321300321120021109101001010000100100000000127011702112951910000100001000010010130033130033130033130033130033
3002413003297400087601300171194082540010100102000010000102000010000506214497148005280113001301300321300321254893126262300102010000200002010000200001300321300321120021109101001010000100100000000127011601112951910000100001000010010130033130033130033130033130033
30024130032974000108601300171194082540010100102000010000102000010000506214497148019960113001301300321300321254893126270300102010000200002010000200001300321300321120021109101001010000100100000000127011601112951910000100001000010010130033130033130033130033130033
3002413003297400073501300171194083340010100102000010000102000010000506214497148005280113001301300321300321254893126262300102010000200002010000200001300321300331120021109101001010000100100001000127011601112952210000100001000010010130033130033130033130033130033
300241301159761322491921300171194082540010100102000010000102000010000506214497148005280113001301300321300321254893126262300102010000200002010000200001300321300341120021109101001010000102100000000127011601112951910000100001000010010130033130378130033130372130033
30024130032974000129881300171194082540010100102000010000102000010000506214497148005280113001301300321300321254893126315300102010000200002010066200001300371300321120021109101001010000100100000000127011601112952010000100001000010010130033130033130033130033130033

Test 3: throughput

Count: 8

Code:

  ucvtf d0, w8
  ucvtf d1, w8
  ucvtf d2, w8
  ucvtf d3, w8
  ucvtf d4, w8
  ucvtf d5, w8
  ucvtf d6, w8
  ucvtf d7, w8
  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)030918191e1f3f4f51schedule 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)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 ret (8f)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)st unit uop (a7)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)? ldst retires (ed)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1602042670920700000266940251601001008000080000100800208001550011689511884163126690026709267096632066658160135200800208002020080020800202689226717118020110009910010080000100000800000000011151172160026719080000800001002671026710267102671026710
1602042670920700000266980251601001008000080000100800208001550011684991901644026690026709267096632066658160135200800208002020080020800202721626716118020110009910010080000100000800000000011151170250026717080000800001002671026710267102671026710
1602042670920700000266940251601001008000080000100800208001550011689511884163026690326716267166632066658160135200800208002020080020800202672326719118020110009910010080000100000800000000011151170160026706080000800001002671426710267102671026710
1602042670920700000266940251601001008000080000100800208001550011689511884163026690026709267096632066658160135200800208002020080020800202670926709118020110009910010080000100000800000000011151171160026706080000800001002671026710267102671026710
1602042670920700000266940251601001008000080000100800208001550011689511884163026690026709267096632066658160135200800208002020080020800202671326709118020110009910010080000100000800000310011151170160026714080000800001002671026813267102671426710
16020426709207000120266940251601001008000080000100800208001550011689511884163126706026709267096632066658160135200800208002020080020800202670926709118020110009910010080000100000800000003011151170160026720080000800001002671027215267142671926710
1602042670920700000267070251601001008000080000100800208001550011753221883406026690026709267096632066658160135200800208002020080020800202670926709118020110009910010080000100000800000000011151170160026706080000800001002671026710267102671026710
1602042670920700000266940251601001008000080000100800208001550011689511884163026690026709267096632066658160135200800208002020080020800202670926709118020110009910010080000100000800000000011151170160026709080000800001002671026710267102671026710
1602042670920700000266940251601001008000080000100802088001550011689511884163026690026709267096633066658160135200800208002020080020800202670926709218020110009910010080000100000800000000011151170160026715080000800001002671026710267102671026710
1602042670920700000266970251601001008000080000100800208001350011689511884163026690026709267096632066658160135200800208002020080020800202679426719118020110009910010080000100000800000000011151170160026706080000800001002671026710267102671026710

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03l1i tlb fill (04)mmu table walk data (08)09l2 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)696d6emap 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)st unit uop (a7)l1d cache writeback (a8)a9acc2cfd5map dispatch bubble (d6)d9dbddfetch restart (de)e0? int output thing (e9)? ldst retires (ed)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1600242671020700000000026702025160010108000080000108000080356501168577188435426690267092671266580366891600102080000800002080000800002670926709118002110910108000010000800000000050202116005112670608000080000102671026901270462684326714
160024267142071000000002669402516001010800008000010800008000050116888018840322669026709267096653036689160010208000080000208000080000267132670911800211091010800001000080000000005020101600892688508000080000102671026710267102671026710
16002426709207000000000266940251600101080000800001080000800005011717401875194266902670926709665303668916001020800008000020800008000026709267091180021109101080000100008000000000502051600992695908000080000102671026710267102671026710
160024267092070000000002669402516001010800008000010800008000050116888018840322669026709267096653036689160010208000080000208000080000267092670911800211091010800001000080000000005020716017102694408000080000102671026710267102671026710
16002426709206000000000266940251600101080000800001080000800005011688801884032266902670926709665303668916001020800008000020800008000026709267091180021109101080000100008000000000502071601852689608000080000102671026710267102671026710
16002426709207000000000266940251600101080000800001080000800005011688801884032266902670926709665303668916001020800008000020800008057026717267091180021109101080000100008000000000502061600992690408000080000102671026710267102671026710
16002426709207000000000266940251600101080000800001080000800005011688801884032266902670926709665303668916001020800008000020800008000026709267091180021109101080000100008000000000502071600572687508000080000102671026710267102671026710
160024267092070000000002669402516001010800008000010800008000050119067518842572669026709267096653036689160010208000080378208000080000267092670911800211091010800001000080000000005020716007102672608000080000102671026710267102671026710
16002426709207000000000266940251600101080000800001080000800005011703911883845266902670926709665303668916001020800008000020800008000026709267091180021109101080000100008000000000502051600482681108000080000102676026765267172671426710
160024272092152011778106160277014292661615721080910809101081301812465012076491908018275342786327705709714312773451625592081326815152081329813262786427915818002110910108000010002508091200263604517610790018152778908000080000102786927874278622787827712