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

SQRDMULH (by element, H)

Test 1: uops

Code:

  sqrdmulh h0, h0, v1.h[1]
  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)a9accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
1004303723061254825100010001000398313130183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303722061254825100010001000398313130183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303723061254825100010001000398313130183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303722061254825100010001000398313130183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303723061254825100010001000398313130183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303722061254825100010001000398313130183037303724153289510001000200030373037111001100000673116112630100030383038303830383038
1004303722361254825100010001000398313130183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303723961254825100010001000398313130183037303724153289510001000200030373037111001100010073116112630100030383038303830383038
10043037220612548251000100010003983131301830373037241532895100010002000303730371110011000223973116112630100030383038303830383038
1004303722061254825100010001000398313130183037303724153289510001000200030373037111001100000073116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  sqrdmulh h0, h0, v1.h[1]
  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)031e3f4e51schedule 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 access (a0)l1d cache writeback (a8)a9accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
102043003722504202954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010001067101161129634100001003003830038300383003830038
102043003722592292954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000007101161129634100001003003830038300383003830038
102043003722401032954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000007101161129634100001003003830038300383003830038
10204300372250842954825101001001000010010000500427731313001830037300372826532874510100200100002002034830037300371110201100991001001000010000007101161129634100001003003830038300383003830038
102043003722503182954825101001001000010010000500427731313001830037300842826532874510100200100002002000030037300371110201100991001001000010000007101161129634100001003003830038300383003830038
102043003722501242954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000007105732129634100001003003830038300383003830038
10204300372250612954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000007101161129634100001003003830038300383003830038
102043003722501202954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000007101161129634100001003003830038300383003830038
102043003722502772954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000007101161129634100001003003830038300383003830038
102043003722501452954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000007101161129634100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)03mmu table walk data (08)l2 tlb miss data (0b)18191e1f3f4e51schedule 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 access (a0)l1d tlb miss (a1)ld unit uop (a6)st unit uop (a7)l1d cache writeback (a8)a9acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
10024300372250000006129548251001010100001010000504277313030018030037300372828732876710010201000020200003003730037111002110910101000010000000006403162229630010000103003830038300383003830038
10024300372250000006129548251001010100001010000504277313030018030037300372828732876710010201000020200003003730037111002110910101000010000010006402162229630010000103003830038300383003830038
100243003722500000015629548251001010100001010000504277313030018030037300372828732876710010201000020200003003730037111002110910101000010000010006402162229630010000103003830038300383003830038
1002430037225000000251295482510010151000010100005042773130300180300373003728287328767100102010000202000030037300371110021109101010000100000430906402162229630010000103003830038300383003830038
100243003722500000072629548251001010100001010000504277313030018030037300372828732876710010201000020200003003730037111002110910101000010000010006402162229630010000103003830038300383003830038
10024300372250000006129548251001010100001010000504277313030018030037300372828732876710010201000020200003003730037111002110910101000010000010006402162229630010000103003830038300383003830038
100243003722500000028629548251001010100001010000504277313130018030037300372828732876710010201000020200003003730037111002110910101000010000000306402162229630010000103003830038300383003830038
100243003722500000072629548251001010100001010000504277313130018030037300372828732876710010201000020200003003730037111002110910101000010000020006402162229630010000103003830038300383003830038
10024300372250000007262954810310010101000010100005042773131300180300373003728287328767100102010000202000030037300371110021109101010000100000320306402162229630010000103003830038300383003830038
100243003722500000044129548251001010100001010000504277313130018030037300372828732876710010201000020200003003730037111002110910101000010000010006402162229630010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  sqrdmulh h0, h1, v0.h[1]
  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)031e3f4e51schedule 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 access (a0)l1d tlb miss (a1)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1020430037235082295482510100100100001001000050042773130300180300373003728265328745101002001000020020000300373003711102011009910010010000100000071011621296340100001003003830038300383003830038
10204300372250497295482510100100100001001000050042773130300180300373003728265328745101002001000020020000300373003711102011009910010010000100221071011611296340100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300180300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300180300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038
10204300372250538295482510100100100001001000050042773130300180300373003728265328745101002001000020020000300373003721102011009910010010000100000071011611296340100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300180300373003728265328745101002001000020020000300373003711102011009910010010000100000071011621296340100001003003830038300383003830038
10204300372250166295482510100100100001001000050042773130300180300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038
10204300372250103295482510100100100001001000050042773130300180300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038
10204300372250106295482510100100100001001000050042773130300180300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300180300373003728265328745101002001000020020000300373003711102011009910010010000100000071011621296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)0318191e3f4e51schedule 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)acbranch cond mispred nonspec (c5)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
10024300372250001032954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010100640616222963010000103003830038300383003830038
10024300372250001262954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010100640216222963010000103003830038300383003830038
1002430037225000842954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000640216222970110000103003830038300383003830038
1002430037225000842954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
10024300372250001892954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
100243003722500020512954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
10024300372250002982954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
1002430037225000842954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
1002430037225000842954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
1002430037225000842954825100101010000101000050427731303001830037300372828732876710010201018020200003003730037111002110910101000010000640216222963010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  sqrdmulh h0, h8, v9.h[1]
  sqrdmulh h1, h8, v9.h[1]
  sqrdmulh h2, h8, v9.h[1]
  sqrdmulh h3, h8, v9.h[1]
  sqrdmulh h4, h8, v9.h[1]
  sqrdmulh h5, h8, v9.h[1]
  sqrdmulh h6, h8, v9.h[1]
  sqrdmulh h7, h8, v9.h[1]
  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)03mmu table walk instruction (07)mmu table walk data (08)l2 tlb miss instruction (0a)l2 tlb miss data (0b)18191e1f3a3f51schedule 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 tlb access (a0)l1d tlb miss (a1)ld unit uop (a6)l1d cache writeback (a8)a9acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
8020420039150000000000104258010010080000100800005006400001200202003920039998903999780100200800002001600002003920039118020110099100100800001000000000511031633200360800001002004020040200902004020040
80204200391500000000004125801001008000010080000500640000120020200392003999737310024801002008000020016000020039200391180201100991001008000010000000120511021622200360800001002004020040200402004020040
802042003915000000000041258010010080000100800005006400001200202003920039997303999780100200800002001600002003920039118020110099100100800001000000060511021622200360800001002004020040200402004020040
8020420039150000000600150258010010080000100800005006400001200202003920039997303999780100200801042001600002003920039118020110099100100800001000000000511021622200360800001002004020040200402004020040
802042003915000000000041258010010080000100800005006400001200202003920039997303999780100200800002001600002003920039118020110099100100800001000000000511021622200360800001002004020040200402004020040
802042003915000000000041258010010080000100800005006400001200202003920039997303999780100200800002001600002003920039118020110099100100800001000000000511021622200360800001002004020040200402004020040
802042003915000000000041258010010080000100800005006400001200202003920039997303999780100200800002001600002003920091118020110099100100800001000000000511021622200360800001002004020040200402004020040
802042003915000000000041258010010080000100800005006400000200202003920039997303999780100200800002001600002003920039118020110099100100800001000000000511021622200360800001002004020040200402004020040
8020420039150000000000146258010010080000100800005006400001200202003920039997303999780100200800002001600002003920039118020110099100100800001000000000511021622200360800001002004020040200402004020040
80204200391500000000001867258010010080000100800005006400001200202003920039997303999780100200800002001600002003920039118020110099100100800001000000000511021622200360800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03mmu table walk data (08)l2 tlb miss data (0b)18191e1f3a3f51schedule 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 access (a0)l1d tlb miss (a1)ld unit uop (a6)st unit uop (a7)l1d cache writeback (a8)a9acc2cfd5map dispatch bubble (d6)dadbddfetch restart (de)e0? int output thing (e9)eb? simd retires (ee)? int retires (ef)f5f6f7f8fd
800242004815000000004025800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100000000050206168022200360080000102004020040200402004020040
800242003914900000004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100000000050202168022200360080000102004020040200402004020040
800242003915000000004025800101080000108000050640000020020200392009099963100198001020800002016000020039200391180021109101080000100000000050202167022200360080000102004020040200402004020040
800242003915000000004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100000000050202167122200360080000102004020040200402004020040
800242003915000000004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100000000050202167022200360080000102004020040200402004020040
80024200391500000000402580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010000040948050542167022200360080000102004020040200402004020040
8002420039150000012004043801101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100000000050202165022200360580000102004020040200402004020040
800242003914900000004025800101080000128000050640000020020200902003999963100198001020800002016021220040200982180021109101080000100000000050203165022200360080000102004020040200402004020040
800242003915000000004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100000000050206164022200360080000102004020040200402004020040
800242003915000000004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100000000050206164022200360080000102004020040200402004020040