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

SQSHRUN (8H)

Test 1: uops

Code:

  sqshrun v0.8b, v0.8h, #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)031e3f4e51schedule uop (52)schedule simd uop (54)dispatch simd uop (57)ldst uops in schedulers (5b)696d6emap 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)ld unit uop (a6)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
100430372396125472510001000100039816030183037303724143289510001000100030373037111001100000073216222629100030743085303830383038
1004303723061254725100010001000398160301830373037241432895100010001000303730371110011000301273216222629100030383038303830383038
100430372396125472510001000100039816030183037303724143289510001000100030373037111001100000073216222629100030383038303830383038
100430372306125472510001000100039816030183037303724143289510001000100030373037111001100000073216222629100030383038303830383038
100430372336125472510001000100039816030183037303724143289510001000100030373037111001100000073216222629100030383038303830383038
100430372236125472510001000100039816030183037303724143289510001000100030373037111001100000073216222629100030383038303830383038
100430372306125472510001000100039816030183037303724143289510001000100030373037111001100000073216222629100030383038303830383038
100430372206125472510001000100039816030183037303724143289510001000100030373037111001100000373216222629100030383038303830383038
1004303723061254725100010001000398160301830373037241432895100010001000303730371110011000013073216222629100030383038303830383038
100430372206125472510001000100039816030183037303724143289510001000100030373037111001100000073216222629100030383038303830383038

Test 2: Latency 1->2

Code:

  sqshrun v0.8b, v0.8h, #3
  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)03181e3f4e51schedule 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)cfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
102043003722500612954725101001001000010010000500427716030018300373003728264328745101002001000020010331300373003711102011009910010010000100000710011611296330100001003003830038300383003830038
10204300372250012332954725101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009910010010000100001710011611296330100001003003830038300383003830038
1020430037225017710772954725101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009910010010000100000710011611296330100001003003830038300383003830038
10204300372250010152954725101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009910010010000100000710011611296330100001003003830038300383003830038
10204300372250012372954725101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009910010010000100000710011611296330100001003003830038300383003830038
10204300372250010022954725101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009910010010000100000710011611296330100001003003830038300383003830038
10204300372240912832954725101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009910010010000100000710011611296330100001003003830038300383003830038
10204300372250012342954725101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009910010010000100000710011611296330100001003003830038300383003830038
10204300372250010612954725101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009910010010000100000710011611296330100001003003830038300383003830038
10204300372240012322954725101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009910010010000100000710011611296330100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)03181e3f4e51schedule 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 tlb access (a0)ld unit uop (a6)st unit uop (a7)l1d cache writeback (a8)acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
100243003722500612954725100101010000101000050427716030018300373003728286328767100102010000201018030037300371110021109101010000100002006402162229629010000103003830038300383003830038
100243003722500612954725100101010000101000050427716030018300373003728286328767100102010000201000030037300371110021109101010000100003006402162229629010000103003830038300383003830038
100243003722500612954725100101010000101000050427716030018300373003728286328767100102010000201000030037300371110021109101010000100001006402162229629010000103003830038300383003830038
100243003722500612954725100101010000101000050427716030018300373003728286328767100102010000201000030037300371110021109101010000100001006402162229629010000103003830038300383003830038
100243003722500612954725100101010000101000050427716030018300373003728286328767100102010000201000030037300371110021109101010000100001006402162229629010000103003830038300383003830038
100243003722400612954725100101010000101000050427716030018300373003728286328767100102010000201000030037300371110021109101010000100001006402162229629010000103003830038300383003830038
100243003722500612954725100101010000101000050427716030018300373003728286328767100102010000201000030037300371110021109101010000100002306402162229629010000103003830038300383003830038
100243003722500612954725100101010000101000050427716030018300373003728286328767100102010000201000030037300371110021109101010000100000006402162229629010000103003830038300383003830038
100243003722500612954725100101010000101000050427716030018300373003728286328767100102010000201000030037300371110021109101010000100001006402162229629010000103003830084300383003830038
100243003722500612954725100101010000101000050427716030018300373003728286328767100102010000201000030037300371110021109101010000100001006402162229629010000103003830038300383003830038

Test 3: throughput

Count: 8

Code:

  sqshrun v0.8b, v8.8h, #3
  sqshrun v1.8b, v8.8h, #3
  sqshrun v2.8b, v8.8h, #3
  sqshrun v3.8b, v8.8h, #3
  sqshrun v4.8b, v8.8h, #3
  sqshrun v5.8b, v8.8h, #3
  sqshrun v6.8b, v8.8h, #3
  sqshrun v7.8b, v8.8h, #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)031e3a3f51schedule 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 cache writeback (a8)acbranch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
80204200591500076025801081008000810080020500640132020020200392009299770699908012020080032200800322003920039218020110099100100800001000011151182162120036800001002004020040200402004020040
80204200391500135725801081008000810080126500640132120020200392003999770699908012020080032200800322003920039118020110099100100800001000011151181161220036800001002004020040200402004020040
80204200391500030258010810080008100800205006401320200202003920039997706999080120200800322008003220039200391180201100991001008000010044011151182162120036800001002004020040200402004020040
8020420039156003025801081008000810080020500640132020138200392019999770699908012020080032200800322003920039118020110099100100800001000011151181161220036800001002004020040200402004020040
8020420039150005325801081008000810080020500640132020083200392003999770699908012020080032200800322003920039118020110099100100800001000011151182161220036800001002004020040200402004020040
80204200391500041525801081008000810080020500640132120020200392003999770699908012020080032200800322003920039118020110099100100800001000011151182162220036800001002004020040200402004020040
8020420039150003025801081008000810080020500640132020020200392003999770699908012020080032200800322003920039118020110099100100800001000011151181161220036800001002004020040200402004020040
8020420039150003025801081008000810080020500640132120020200392003999770699908012020080032200800322003920039118020110099100100800001000011151182161220036800001002004020040200402004020040
80204200391500030425801081008000810080020500640132120020200392003999770699908012020080032200800322003920039118020110099100100800001000011151182162120036800001002004020142200402004020040
80204200391500022025801081008000810080020500640132120020200392003999770699908012020080032200800322003920039118020110099100100800001000011151182162220036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)0309191e3a3f51schedule 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)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
800242005115000122254258001010800001080000506400000200202003920039999631001980010208000020800002003920039118002110910108000010005020516662003680000102004020040200402004020040
8002420039150006127425801071080000108021350640000020020200392009799963010019800102080000208000020039201901180021109101080000101019005020616762003680000102004020040200402004020040
8002420039150000182258001010800001080000506400000200202003920039999631001980010208000020800002024320039118002110910108000010105020816772003680000102004020040200402004020040
80024200391500002103258001010800001080000506400000200202003920039999631001980010208000020800002003920039118002110910108000010105020716652003680000102004020040200402004020040
800242003915000121347258001010800001080000506400000200202003920039999631001980010208000020800002003920039118002110910108000010035020816782003680000102004020040200402004020040
8002420039150000182258001010800001080000506400000200202003920039999631001980010208000020800002003920039118002110910108000010005020616572003680000102004020040200402004020040
80024200391500001269258020310800001080000506400000200202003920039999631001980010208000020800002003920039118002110910108000010105020516562003680000102004020040200402004020040
80024200391500001213258001010800001080000506400000200202003920039999631001980010208000020800002003920039118002110910108000010005020516582003680000102004020040200402004020040
8002420039150000140258001010800001080000506400000200202003920039999631001980010208000020800002003920039118002110910108000010035020616772003680000102004020040200402004020040
8002420039150000140258001010800001080000506400000200202003920039999631001980010208000020800002003920039118002110910108000010005020816652003680000102004020040200402004020040