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 (vector, 8H)

Test 1: uops

Code:

  sqrdmulh v0.8h, v0.8h, v1.8h
  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)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
10043037230612548251000100010003983133018303730372415328951000100020003037303711100110000073216222630100030383038303830383038
10043037220822548251000100010003983133018303730372415328951000100020003037303711100110000073216222630100030383038303830383038
100430372302912548251000100010003983133018303730372415328951000100020003037303711100110000073216222630100030383038303830383038
10043037230822548251000100010003983133018303730372415328951000100020003037303711100110001073216222630100030383038303830383038
10043037230612548251000100010003983133018303730372415328951000100020003037303711100110000073216222630100030383038303830383038
100430372203172548251000100010003983133018303730372415328951000100020003037303711100110000073216222630100030383038303830383038
10043037230612548251000100010003983133018303730372415328951000100020003037303711100110000073216222630100030383038303830383038
10043037230612548251000100010003983133018303730372415328951000100020003037303711100110000073216222630100030383038303830383038
10043037230612548251000100010003983133018303730372415328951000100020003037303711100110000073216222630100030383038303830383038
10043037230612548251000100010003983133018303730372415328951000100020003037303711100110000073216222630100030383038303830383038

Test 2: Latency 1->2

Code:

  sqrdmulh v0.8h, v0.8h, v1.8h
  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 cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
102043003722506129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722509329548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373022811102011009910010010000100007101161129634100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043008522506129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225012429548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373017911102011009910010010000100797101161129634100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038

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)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)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
10024300372250100000822954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000000006404163429630010000103003830038300383003830038
10024300372250000000612954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000000006404164329630010000103003830038300383003830038
100243003722500000001242954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000000006403163429630010000103003830038300383003830038
100243003722500000001452954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000000006403164429630010000103003830038300383003830038
100243003722500000001662954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000000006404164429630010000103003830038300383003830038
100243003722500000008322954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000000006404164329630010000103003830038300383003830038
1002430037225000000011242954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000000006404164429630010000103003830038300383003830038
10024300372250000000612954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000000006404164329630010000103003830038300383003830038
100243003722500000005832954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000000006404164429630010000103003830038300383003830038
100243003722400000001262954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000000006403164429630010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  sqrdmulh v0.8h, v1.8h, v0.8h
  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)0318191e1f3a3f4e51schedule 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)a9acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
10204300372250000082295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000100071011611296340100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037211020110099100100100001000000071011611296349100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000100071011611296340100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
10204300372240000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773131300183003730037282873287451010020010000200200003003730181111020110099100100100001000000071011611296340100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038

1000 unrolls and 10 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)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
1002430037224012829548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383008530038
1002430037225072629548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038
100243003722506129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100306402162229630010000103003830038300383003830038
1002430037225186129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038
100243003722506129548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038
100243003722506129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038
100243003722406129548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103008130038300383003830038
1002430037225072629548251001010100001010000504277313130018300373003728287328767100102010000202000030083300851110021109101010000100006402162229630010000103003830038300383003830038
1002430037225072629548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038
1002430037225216129548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  sqrdmulh v0.8h, v8.8h, v9.8h
  sqrdmulh v1.8h, v8.8h, v9.8h
  sqrdmulh v2.8h, v8.8h, v9.8h
  sqrdmulh v3.8h, v8.8h, v9.8h
  sqrdmulh v4.8h, v8.8h, v9.8h
  sqrdmulh v5.8h, v8.8h, v9.8h
  sqrdmulh v6.8h, v8.8h, v9.8h
  sqrdmulh v7.8h, v8.8h, v9.8h
  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)1e1f3a3f51schedule 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)9faccfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
802042006015110100248258010010080000100800005006400000200202003920039997339997801002008000020016020820143200391180201100991001008000010005114121610920036800001002004020040200402004020040
80204200391501110024825801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000511491610920036800001002004020040200402004020040
8020420039150101002482580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100051141016101020036800001002004020040200402004020040
8020420039150101002482580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100051141016101020036800001002004020040200402004020040
80204200391501010024825801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000511410169720036800001002004020040200402004020040
802042003915010100248258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010005114101611620036800001002004020040200402004020040
802042003915010100248258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010005114101691020036800001002004020040200402004020040
80204200391501010029025801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000511411169920036800001002004020040200402004020040
80204200391501010024825801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000511410169920036800001002004020040200402004020040
8020420039150101002482580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100051147169420036800001002004020040200402004020040

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)1e3f51schedule 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)cdcfd5map dispatch bubble (d6)d9dadbddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
8002420039150004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100050203160002320036080000102004020040200402004020040
8002420039150004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100050203160004320036080000102004020040200402004020040
8002420039150004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100050202160003420036080000102004020040200402004020040
80024200391500014925800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100050204160002220036080000102004020040200402009020040
8002420039150004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100050203160002420036080000102004020040200402004020040
8002420039150004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100050202160003220036080000102004020040200402004020040
8002420039150004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100050203160002220036080000102004020040200402004020040
8002420039150004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100050202160002220036080000102004020040200402004020040
8002420039150004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100050202160003220036080000102004020040200402004020040
8002420039150004025800101080000108000050640000020020200392003999963100198001020800002016021420039200391180021109101080000100050203160004420036080000102004020040200402004020040