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

FCVTMS (vector, 2D)

Test 1: uops

Code:

  fcvtms v0.2d, v0.2d
  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)031e3f4e51schedule 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)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
100430372408225472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372306125472510001000100039816003018303730372414728951000100010003037303711100110000073116112629100030383038303830383038
100430372306125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372306125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372306125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372306125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372406125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372406125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372306125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372306125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038

Test 2: Latency 1->2

Code:

  fcvtms v0.2d, v0.2d
  movi v0.16b, 1
  movi v1.16b, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 3.0037

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)60696b6d6emap 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)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
10204300372320061295472510100100100001001000050042771600300180300373003728264328745101002001000020010000300373003711102011009910010010000100007101161129633100001003003830038300383003830038
10204300372330061295472510100100100001001000050042771601300180300373003728264328745101002001000020010000300373003711102011009910010010000100007101161129633100001003003830038300383003830038
10204300372330061295472510100100100001001000050042771600300660300373003728264328745101002001000020010000300373003711102011009910010010000100007101161129633100001003003830038300383003830038
102043003723300251295472510100100100001001000050042771600300180300373003728264328745101002001000020010000300373003711102011009910010010000100007101161129633100001003003830038300383003830038
10204300372320061295472510100100100001001000050042771600300180300373003728264328745101002001000020010000300373003711102011009910010010000100007101161129633100001003003830038300383003830038
10204300372330071295472510100100100001001000050042771600300180300373003728264328745101002001000020010000300373003711102011009910010010000100007101161129633100001003003830038300383003830038
10204300372320061295472510100100100001001000050042771600300180300373003728264328745101002001000020010000300373003711102011009910010010000100307101161129633100001003003830038300383003830038
10204300372331061295472510100100100001001000050042771601300180300373003728264328745101002001000020010000300373003711102011009910010010000100007101161129633100001003003830038300383003830038
102043003723300251295472510100100100001001000050042771600300180300373003728264328745101002001000020010000300373003711102011009910010010000100007101161129633100001003003830038300383003830038
10204300372330061295472510100100100001001000050042771600300180300373003728264328745101002001000020010000300373003711102011009910010010000100007101161129633100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

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)6061696d6emap 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)a9accfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
100243003723200612954725100101010000101000050427716000300183003730037282863287671001020100002010000300373003711100211091010100001000064002162229629010000103003830038300383003830121
100243003723300612954725100101010000101000050427716010300183003730037282863287671001020100002010000300373003711100211091010100001000064002162229629010000103003830038300383003830038
100243003723300612954725100101010000101000050427716000300183003730037282863287671001020100002010000300373003711100211091010100001020064002162229629010000103003830038300383003830038
100243003723300612954725100101010000101000050427716010300183003730037282863287671001020100002010000300373003711100211091010100001010064022162229690010000103003830038300383003830038
100243003723300892954725100101010000101000050427716000300183003730037282863287671001020100002010000300373003711100211091010100001010064002162229629010000103003830038300383003830038
1002430037233007262954725100101010000101000050427716000300183003730037282863287671001020100002010000300373003711100211091010100001010064002162229629010000103003830038300383003830038
100243003723300612954725100101010000101000050427716010300183003730037282863287671001020100002010000300373003711100211091010100001010064002162229629010000103003830038300383003830038
100243003723300612954725100101010000101000050427716010300183003730037282863287671001020100002010000300373003711100211091010100001020064002162229629010000103003830038300383003830038
100243003723200612954725100101010000101000050427716010300183003730037282863287671001020100002010000300373003711100211091010100001030064002162229629010000103003830038300383003830038
100243003724100612954725100101010000101000050427716010300183003730037282863287671001020100002010000300373003711100211091010100001000364002162229629010000103003830038300383003830038

Test 3: throughput

Count: 8

Code:

  fcvtms v0.2d, v8.2d
  fcvtms v1.2d, v8.2d
  fcvtms v2.2d, v8.2d
  fcvtms v3.2d, v8.2d
  fcvtms v4.2d, v8.2d
  fcvtms v5.2d, v8.2d
  fcvtms v6.2d, v8.2d
  fcvtms v7.2d, v8.2d
  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)6061696d6emap 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 cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd0d2d5map dispatch bubble (d6)dbddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
80204200581550030258010810080008100800205006401321020020200392003999776999080120200800322008003220039200391180201100991001008000010000111511800116000200360800001002004020040200402004020040
80204200391550030258010810080008100800205006401321020020200392003999776999080120200800322008003220039200391180201100991001008000010010111511800016000200360800001002004020040200402004020040
802042003915512030258010810080008100800205006401321020020200392003999776999080120200800322008003220039200391180201100991001008000010000111511800016000200360800001002004020040200402004020040
802042009215500505258010810080008100800205006401321020020200392003999776999080120200800322008003220039200391180201100991001008000010000111511800016000200360800001002004020040200402004020040
802042003915500410258010810080008100801285006401321020020200392003999776999080120200800322008003220039200391180201100991001008000010003111511800016000200360800001002004020040200402004020040
80204200391560030258010810080008100800205006401321020020200392003999776999080120200800322008003220039200391180201100991001008000010000111511800016000200360800001002004020040200402004020040
80204200391556072258010810080008100800205006401321020020200392003999776999080120200800322008003220039200391180201100991001008000010000111511800016000200360800001002004020040200402004020040
80204200391550030258010810080008100800205006401321020020200392003999776999080120200800322008003220039200391180201100991001008000010000111511800016000200360800001002004020040200402004020040
80204200391560030258010810080008100800205006401321020020200392003999776999080120200800322008003220039200391180201100991001008000010000111511800016000200360800001002004020040200402004020040
80204200391550030258010810080008100800205006401321020020200392003999776999080120200800322008003220039200391180201100991001008000010000111511800016000200360800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)031e1f3a3f51schedule 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)696d6emap 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)cfd5map dispatch bubble (d6)ddfetch restart (de)e0eaeb? simd retires (ee)? int retires (ef)f5f6f7f8fd
800242003915500040258001010800001080000506400002002020039200399996310019800102080000208000020039200391180021109101080000100005020716662003612780000102004020040200402004020040
8002420039155000402580010108000010800005064000020020200392003999963100198001020800002080000200392003911800211091010800001000050203166620036109080000102004020040200402004020040
800242003915500040258001010800001080000506400002002020039200399996310019800102080000208000020039200391180021109101080000100005020516752003659080000102004020040200402004020040
800242003915600040258001010800001080000506400002002020039200399996310019800102080000208000020039200391180021109101080000100005020516532003673080000102004020040200402004020040
800242003915500040258001010800001080000506400002002020039200399996310019800102080000208000020039200391180021109101080000100005020516652003658080000102004020040200402006220040
800242003915600040258001010800001080000506400002002020039200399996310019800102080000208000020039200391180021109101080000100005020316352003657080000102004020040200402004020040
800242003915600014925800101080000108000050640000200202003920039999631001980010208000020800002003920039118002110910108000010000502051653200360080000102004020040200402004020040
800242003915590040025800101080000108000050640000200202003920039999631001980010208000020800002003920039118002110910108000010030502031655200360080000102004020040200402004020040
80024200391550007525800101080000108000050640000200202003920039999631001980010208000020800002003920039118002110910108000010000502031635200360080000102004020040200402004020040
80024200391560008625800101080000108000050640000200202003920039999631001980010208000020800002003920039118002110910108000010000502031635200360080000102004020040200402004020040