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

SQSUB (scalar, H)

Test 1: uops

Code:

  sqsub h0, h0, h1
  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)acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
1004303723061254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303723061254825100010001000398313030633037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303723061254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303722061254825100010001000398313030183037303724153289510001000200030373037111001100003073116112630100030383038303830383038
1004303723061254825100010001000398313130183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303723061254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
10043037230139254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303723061254825100010001000398313130183037303724153289510001000200030373037111001100070073116112630100030383038303830383038
1004303722061254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303723061254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  sqsub h0, h0, h1
  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)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 tlb miss (a1)ld unit uop (a6)st unit uop (a7)l1d cache writeback (a8)a9acbranch cond mispred nonspec (c5)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
1020430037225006129548251010010010000100100005004277313130018030037300372826532874510100200100002062000030037300371110201100991001001000010000020007102162229634100001003003830038300383008130038
1020430037225006129548251010010010000100100005004277313030018030037300372826532874510100200100002002000030037300371110201100991001001000010000000007102162229634100001003003830038300383003830038
1020430037225006129548251010010010000100100005004277313030018030037300372826532874510100200100002002000030037300371110201100991001001000010000000007102162229634100001003003830038300383003830038
10204300372250061295482510100100100001001000050042773130300180300373003728265328745101002001000020020000300373003711102011009910010010000100000105707102162229634100001003003830038300383003830038
1020430037224006129548251010010010000100100005004277313030018030037300372826532874510100200100002002000030037300371110201100991001001000010000000007102162229634100001003003830038300383003830038
1020430037225006129529251010010010008100100005004277313030018030037300372826532874510100200100002002000030037300371110201100991001001000010000010007102162229634100001003003830038300383003830038
1020430037225006129548251010010010000100100005004277313130018030037300372826532874510100200100002002000030037300371110201100991001001000010000000007102162229634100001003003830038300383003830038
1020430037225006129548251010010010000104100005004277313130018030037300372826532874510100200100002002000030037300371110201100991001001000010000030007102162229634100001003003830038300383003830038
1020430037225006129548251010010010000100100005004277313130018030037300372826532874510100200100002002000030037300371110201100991001001000010000010017102162229634100001003003830038300383003830038
1020430037225006129548251010010010000100100005004277313130018030037300372826532874510100200100002002000030037300371110201100991001001000010000000007102162229634100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)03mmu table walk data (08)1e1f3f4e51schedule 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)acbranch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
10024300372250006129548251001010100001010000504277313130018030037300372828732876710010201000020200003003730037111002110910101000010000640316332963010000103003830038300383003830038
10024300372250006129548251001010100001010000504277313130018030037300372828732876710010201000020200003003730037111002110910101000010000640316332963010000103003830038300383003830038
10024300372250006129548251001010100001010000504277313130018030037300372828732876710010201000020200003003730037111002110910101000010960640316332963010000103003830038300383003830038
10024300372250006129548251001010100001010000504277313130018030037300372828732876710010201000020200003003730037111002110910101000010100640316332963010000103003830038300383003830038
10024300372250006129521251001010100001010000504277313130018030037300372828732876710010201000020200003003730037111002110910101000010000640316332963010000103003830038300383003830038
10024300372250006129548251001010100001010000504277313130018030037300372828732876710010201000020200003003730037111002110910101000010000640316332963010000103003830038300383003830038
10024300372250006129548251001010100001010000504277313130018030037300372828732876710010201000020200003003730037111002110910101000010030640316332963010000103003830038300383003830038
10024300372250006129548251001010100001010000504277313030018030037300372828732876710010201000020200003003730037111002110910101000010000640316332963010000103003830038300383003830038
10024300372250006129548251001010100001010000504277313130018030037300372828732876710010201000020200003003730037111002110910101000010000640316332963010000103003830038300383003830038
10024300372250006129530251001010100001010000504277313130018030037300372828732876710010201000020200003003730037111002110910101000010000640316332963010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  sqsub h0, h1, h0
  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)03mmu table walk data (08)09l2 tlb miss data (0b)191e3f4e51schedule 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 tlb miss (a1)ld unit uop (a6)l1d cache writeback (a8)a9acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
10204300372250000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038
102043003722500100825295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038
10204300372240000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038
102043003722500000189295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000200007101161129634100001003003830038300383003830038
10204300372240000061295482510100100100001001000050042773130300643003730037282653287451010020010000200200003003730037111020110099100100100001000000007101161129634100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)03mmu table walk instruction (07)mmu table walk data (08)09l2 tlb miss instruction (0a)l2 tlb miss data (0b)18191e1f3a3f4e51schedule 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)696b6d6emap 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)acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
100243003722500000000006129548251001010100001010000504277313300180300373003728287328767100102010000202000030037300371110021109101010000101006403163329630010000103003830038300383003830038
100243003722500000000006129548251001010100001010000504277313300180300373003728287328767100102010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038
100243003722500000000006129548251001010100001010000504277313300180300373003728287328767100102010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038
100243003722500000000006129548251001010100001010000504277313300180300373003728287328767100102010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038
100243003722500000000006129548251001010100001010000504277313300180300373003728287328767100102010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038
100243003722500000000006129548251001010100001010000504277313300180300373003728287328767100102010000202000030037300371110021109101010000103006403163329630010000103003830038300383003830038
100243003722500000000006129548831001010100001010000504277313300180300373003728287328767100102010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038
100243003722500000000006129548251001010100001010000504277313300180300373003728287328767100102010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038
100243003722500000000006129548251001010100001010000504277313300180300373003728287328767100102010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038
100243003722500000000006129548251001010100001010000504277313300180300373003728287328767100102010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  sqsub h0, h8, h9
  sqsub h1, h8, h9
  sqsub h2, h8, h9
  sqsub h3, h8, h9
  sqsub h4, h8, h9
  sqsub h5, h8, h9
  sqsub h6, h8, h9
  sqsub h7, h8, h9
  movi v8.16b, 9
  movi v9.16b, 10

(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)030918191e1f3f51schedule 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)9fld unit uop (a6)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
802042003915000000412580100100800001008000050064000012002020039200399973399978010020080000200160000200392003911802011009910010080000100000511041611200360800001002004020040200402004020040
802042003915000000412580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000511011611200360800001002004020040200402004020040
802042003915000000412580100100800001008000050064000012002020039200399973399978010020080000200160000200392003911802011009910010080000100000511011611200360800001002004020040200402004020040
802042003915000000622580100100800001008000050064000012002020039200399973399978010020080000200160000200392003911802011009910010080000100000511011611200360800001002004020040200402004020040
802042003915000000412580100100800001008000050064082412002020039200399973399978010020080000200160000200392003911802011009910010080000100000511011611200360800001002004020040200402004020040
802042003915000000412580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000511011611200360800001002004020040200402004020040
802042003915000000412580100100800001008000050064000012002020039200399973399978010020080000200160000200392003911802011009910010080000100000512712711200770800001002008920094201012004020102
80204201011501111321044125801001008000010080000500640000020020200392034999838100238021820080104202160210201002011721802011009910010080000100204755128125112007516800001002009020104200912010220094
8020420039150000002872580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000511011611200360800001002004020040200402004020040
8020420039150000120412580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000511011611200360800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)031e3f51schedule 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)acc2branch cond mispred nonspec (c5)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
800242004815001295258001010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001000005020416442003680000102004020040200402004020040
8002420039150040258001010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001000005020416432003680000102004020040200402004020040
8002420039150040258001010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001000005020516442003680000102004020040200402004020040
80024200391500103258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000005020416432003680000102004020040200402004020040
8002420039150040258001010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001000005020416342003680000102004020040200402004020040
8002420039150040258001010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001000005020416342003680000102004020040200402004020040
8002420039150040258001010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001000005020516432003680000102004020040200402004020040
8002420039150040258009010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001000005020416442003680000102004020040200402004020040
80024200391500305258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000005020416442003680000102004020040200402004020040
8002420039150040258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000005020416442003680000102004020040200402004020040