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

FCVTPU (scalar, H to X)

Test 1: uops

Code:

  fcvtpu x0, h0
  mov x0, 1
  mov x1, 2

(no loop instructions)

1000 unrolls and 1 iteration

Retires: 2.000

Issues: 3.000

Integer unit issues: 1.000

Load/store unit issues: 0.000

SIMD/FP unit issues: 2.000

retire uop (01)cycle (02)031e3f51schedule uop (52)schedule int uop (53)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 int alu (97)l1d cache writeback (a8)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
2004541403032530001000200020001800015225415412483274200020002000541541111001100007311611538100010001000542542542542542
200454140432530001000200020001800005225415412483274200020002000541541111001100007311611538100010001000542542542542542
200454140432530001000200020001800005225415412483274200020002000541541111001100007311611538100010001000542542542542542
200454150432530001000200020001800005225415412483274200020002000541541111001100007311611538100010001000542542542542542
200454140432530001000200020001800005225415412483274200020002000541541111001100007311611538100010001000542542542542542
200454140432530001000200020001800015225415412483274200020002000541541111001100007311611538100010001000542542542542542
200454140512530001000200020001800005225415412483274200020002000541541111001100017311611538100010001000542542542542542
200454140432530001000200020001800005225415412483274200020002000541541111001100007311611538100010001000542542542542542
200454140432530001000200020001800015225415412483274200020002000541541111001100007311611538100010001000542542542542542
200454150432530001000200020001800005225415412483274200020002000541541111001100007311611538100010001000542542542542542

Test 2: Latency 1->2 roundtrip

Code:

  fcvtpu x0, h0
  fmov d0, x0
  mov x0, 1
  mov x1, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 13.0038

retire uop (01)cycle (02)03mmu table walk data (08)09l2 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 miss (a1)ld unit uop (a6)l1d cache writeback (a8)a9acc2branch cond mispred nonspec (c5)branch 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
3020413003897400000001300231194172540100101002000010000100200001000050062149791480103411300911300381300381254763126246301002001000020000200100002000013003813003811202011009910010100100001000100000000000131012162212952510000100001000010100130039130039130039130039130039
3020413003897400000001300231194172540100101002000010000100200001000050062149791480103411300131300381300381254763126251301002001000020000200100002000013003813003811202011009910010100100001000100000000000131012162212952510000100001000010100130039130039130039130039130039
3020413003897400000601300231194172540100101002000010000100200001000050062149791480103411300521300591300391254763126246301002001000020000200100002000013003813003811202011009910010100100001000100000000000131012162212952510000100001000010100130039130039130039130039130039
3020413003897400000001300231194172540100101002000010000100200001000050062149791480103411300531300381300381254763126246301002001000020000200100002000013003813007011202011009910010100100001000100000000000131012162212952510000100001000010100130039130039130039130039130039
3020413003897400000001300231194172540100101002000010000100200001000050062149791480103411300131300411300381254763126246301002001000020000200100002000013003813003811202011009910010100100001000100000000000131012162212952510000100001000010100130039130039130039130039130039
3020413003897400000001300231194172540100101002000010000116200001000050062149791480103411300751300381300381254763126246301002001000020000200100002000013003813003811202011009910010100100001000100000030000131012162212952510000100001000010100130039130039130039130039130039
3020413003897400000001300561194172540100101002000010000100200001000050062149791480103411300141302081300411254763126446301002001000020000200100002000013004013003811202011009910010100100001000100000000000131012162212952510000100001000010100130039130043130039130039130039
302041300389740000057881300231194172540100101002000010000103201161000051062266531480103411300641301181300381254773126246302742001000020244202100002012213003813003911202011009910010100100001000100000030000131012162212952710000100001000010100130039130039130039130039130039
3020413003897400000001300231194172540100101002000010000100200001000050062150271480149011300131300381300381254763126246301002001000020000200100002000013003813003811202011009910010100100001000100000000000131014162212952510000100001000010100130042130039130041130042130039
3020413003897400000001300231194172540100101002000010000100200001000050062149791480103411300621300381300381254763126246301002001000020000200100002000013003813003811202011009910010100100001000100000000000131012162212952510000100001000010100130039130039130039130039130039

1000 unrolls and 10 iterations

Result (median cycles for code): 13.0038

retire uop (01)cycle (02)03mmu table walk instruction (07)mmu table walk data (08)l2 tlb miss instruction (0a)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)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)9fld unit uop (a6)l1d cache writeback (a8)accdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? ldst retires (ed)? simd retires (ee)? int retires (ef)f5f6f7f8fd
300241300389741010000213002311941725400101001020000100001020000100005062149791480002511300131300381300381254983126268300102010000200002010000200001300381300381120021109101001010000101000000012741616121612952510000100001000010010130039130039130039130039130039
300241300389741010000213002311941725400101001020000100001020000100005062149791480002501300131300381300381254983126268300102010000200002010000200001300381300381120021109101001010000101000000012741416131512952510000100001000010010130039130039130039130039130039
300241300389741010000213002311941725400101001020000100001020000100005062149791480002501300131300381300381255153126268300102010000200002010000200001300381301361120021109101001010000101000000012741516141312952510000100001000010010130039130039130039130039130039
300241300389741010000213005911941725400101001020000100001020000100005562149791480002501300131300381300381254983126268300102010000201312010000200001300381300431120021109101001010000101000000012741516131612952510000100001000010010130039130039130039130039130039
300241300389741010000213002311941725400101001020000100001020000100005062149791480002501300131300381300381254983126268300102010000200002010000200001300381300381120021109101001010000101000000012741516141712952510000100001000010010130039130039130039130039130039
300241300389741010000213002311941725400101001020000100001020000100005062149791480002501300131300381300381254983126268300102010000200002010000200001300381300381120021109101001010000101000000012741516141512952510000100001000010010130039130039130039130039130039
300241300389741010000213002311941725400101001020000100001020000100005062149791480002501300131300381300381254983126268300102010000200002010000200001300381300381120021109101001010000101000000012741516131612952510000100001000010010130039130039130039130039130039
3002413003997410100002130023119417254001010010200001000010200001000050621497914800025013001313003813003812549831262683001020100002000020100002000013003813003811200211091010010100001010000601211274151614912952510000100001000010010130039130039130039130039130039
300241300389741010000213002311941725400101001020000100001020000100005062149791480002501300131300401300381254983126268300102010000200002010000200001300381300381120021109101001010000101000000012741416131412952510000100001000010010130039130039130043130039130039
300241300389741010000213002311941725400161001020000100001020000100005062149791480002501300131300381300381254983126268300102010000200002010000200001300381300381120021109101001010000101000000012741716121412957410000100001000010010130039130039130039130039130039

Test 3: throughput

Count: 8

Code:

  fcvtpu x0, h8
  fcvtpu x1, h8
  fcvtpu x2, h8
  fcvtpu x3, h8
  fcvtpu x4, h8
  fcvtpu x5, h8
  fcvtpu x6, h8
  fcvtpu x7, h8
  mov x8, 9

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code divided by count): 0.5005

retire uop (01)cycle (02)03mmu table walk data (08)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)60696d6emap stall dispatch (70)rob full (74)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)9fl1d tlb miss (a1)l1d cache writeback (a8)acbranch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
160204400663100000007202524010480186160004100160020500144013204002240041400411997706199921601202001600322001600324004140041118020110099100801001000001115117011600400388000080000801004004240042400424004240042
16020440041310000000322524010480100160004100160020500144013214002240041400411997706199921601202001600322001600324004140041118020110099100801001000001115117001600400388000080000801004004240042400424004240042
16020440041311000000322524010480100160004100160020500144013214002240041400411997706199921601202001600322001600324004140041118020110099100801001000001115117001600400388000080000801004004240042400424004240042
16020440041311000000322524010480100160004100160020500144013214002240041400411997706199921601202001600322001600324004140041118020110099100801001000001115117001600400388000080000801004004240042400424004240042
16020440041311000000322524010480100160004100160212500144013204002240125400411997706199921601202001600322001600324004140041118020110099100801001000101115117001600400388000080000801004004240042400424004240042
16020440041310000000322524010480100160004100160020500144013214002240041400411997706199921601202001600322001600324004140041118020110099100801001000001115117001600400388000080000801004004240042400424004240042
1602044004131000004890322524010480100160004100160020500144013214002240041400411997706199921601202001600322001600324004140041118020110099100801001000001115117001600400388000080000801004004240042400424004240042
16020440041310000000322524010480100160004100160020500144013214002240041400411997756199921601202001600322001600324004140041118020110099100801001000001115117001600400388000080000801004004240042400424004240042
16020440041310000000322524010480100160004100160020500144013214002240041400411997706200491601202001600322001600324004140041118020110099100801001000001115117001600400388000080000801004004240042400424004240042
16020440041310000000322524010480190160004100160020500144013204002240041400411997706199921601202001600322001600324004140041118020110099100801001000101115117001600400388000080000801004004240042400424004240042

1000 unrolls and 10 iterations

Result (median cycles for code divided by count): 0.5005

retire uop (01)cycle (02)03mmu table walk data (08)191e3f51schedule 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)9fl1d cache writeback (a8)accfd5map dispatch bubble (d6)d9daddfetch restart (de)e0? int output thing (e9)ea? simd retires (ee)? int retires (ef)f5f6f7f8fd
1600244005431000042252400108001016000010160000501440000014002240041400411999632002116001020160000201600004004140041118002110910800101000502051600254003880000080000800104004240042400424004240042
16002440041310000149252400108001016000010160000501440000014002240041400411999632002116001020160000201600004004140041118002110910800101000502021600244003880000080000800104004240042400424004240042
1600244004131100042252400108001016000010160000501440000014002240041400411999632002116001020160000201600004004140041118002110910800101000502041600364003880000080000800104004240042400424004240042
1600244004132200042252400108001016000010160000501440000014002240041400411999632002116001020160000201600004004140041118002110910800101000502041600424003880000080000800104004240042400424004240042
1600244004131000042252400108001016000010160000501440000004002240041400411999632002116042620160000201600004004140041118002110910800101000502021600444003880000080000800104004240042400424004240042
1600244004131000042252400108001016000010160000501440000004002240041400411999632002116001020160000201600004019840041118002110910800101000502021600244003880000080000800104004240042400424004240042
16002440041310000191252400108001016000010160000501440000014002240041400411999632002116001020160000201600004004140041118002110910800101000502021600244003880000080000800104004240042400424004240042
1600244004131000042252400108001016000010160000501440000014002240041400411999632002116001020160000201600004004140041118002110910800101000502041600424003880000080000800104004240042400424004240042
1600244004131100042252400108001016000010160000501440000014002240041400411999632002116001020160000201600004004140041118002110910800101000502041600434003880000080000800104004240042400424004240042
1600244004131100042252400108001016000010160000501440000014002240041400411999632002116001020160000201600004004140041118002110910800101000502041600644003880000080000800104004240042400424004240042