Apple M1 Microarchitecture Research by Dougall Johnson

Firestorm: Overview | Base Instructions | SIMD and FP Instructions
Icestorm:  Overview | Base Instructions | SIMD and FP Instructions

PMULL (8H)

Test 1: uops

Code:

  pmull v0.8h, v0.8b, v1.8b
  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 (01)cycle (02)03181e3f4e51inst issue (52)~issue fp/simd (54)~dispatch fp/simd (57)huge thing fp/simd (5b)60696d6edispatch stall (70)scheduler rewind (75)scheduler stall (76)~dispatch op (78)~map op fp/simd (7e)~map lookup fp/simd (81)8283pipeline redirect (84)85inst all (8c)inst neon or fp (9a)a7a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
10043037230084254825100010001000398313130183037303724153289510001000200030373037111001100010373116112630100030383038303830383038
10043037220061254825100010001000398313130183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
10043037231061254825100010001000398313130183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
10043037230061254825100010001000398313130183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
10043037230061254825100010001000398313130183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
100430372300103254825100010001000398313130183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
10043037220061254825100010001000398313130183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
10043037230061254825100010001000398313130183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
10043037230061254825100010001000398313130183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
10043037230061254825100010001000398313130183037303724153289510001000200030373037111001100000073116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  pmull v0.8h, v0.8b, v1.8b
  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 (01)cycle (02)03090b18191e3a3f4e51inst issue (52)~issue int (53)~issue fp/simd (54)~dispatch int (56)~dispatch fp/simd (57)huge thing int (59)huge thing fp/simd (5b)696d6edispatch stall (70)scheduler rewind (75)scheduler stall (76)~dispatch op (78)~map op int (7c)~map op fp/simd (7e)~map lookup int (7f)~map lookup fp/simd (81)8283pipeline redirect (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst b.cc (94)inst integer (97)inst neon or fp (9a)9fa8acc5cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204300372251100002752954810410100100100001001000050042773133001830037300372826532874510100200100002002000030037301793110201100991001001000010000071011611296340100001003003830038300383003830038
10204300372240000001192295482510100100100081041000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038
10204300372250000001488295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038
10204300372250000001003295482510100100100001001000050042773133012630037300372826532874510100200101672042000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038
102043003722500000061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038
10204300372250000001067295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038
10204300372250000120220295482510173100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038
1020430037225000000974295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038
1020430037224000000965295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038
1020430037225000000953295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)030b3f4e51inst issue (52)~issue int (53)~issue fp/simd (54)~dispatch int (56)~dispatch fp/simd (57)huge thing int (59)huge thing fp/simd (5b)696d6edispatch stall (70)scheduler rewind (75)scheduler stall (76)~dispatch op (78)~map op int (7c)~map op fp/simd (7e)~map lookup int (7f)~map lookup fp/simd (81)8283pipeline redirect (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst b.cc (94)inst integer (97)inst neon or fp (9a)9facc5cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024300372250166295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
10024300372250527295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630510000103003830038300383003830038
10024300372250189295482510022101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
10024300372250233295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
10024300372250212295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
10024300372250355295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
10024300372250149295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630210000103003830038300383003830038
1002430037225161295482510010101000010100005042773133005430037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
1002430037225061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
10024300372250189295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  pmull v0.8h, v1.8b, v0.8b
  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 (01)cycle (02)03080b18191e1f3f4e51inst issue (52)~issue int (53)~issue fp/simd (54)~dispatch int (56)~dispatch fp/simd (57)huge thing int (59)huge thing fp/simd (5b)60696d6edispatch stall (70)scheduler rewind (75)scheduler stall (76)~dispatch op (78)~map op int (7c)~map op fp/simd (7e)~map lookup int (7f)~map lookup fp/simd (81)8283pipeline redirect (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst b.cc (94)inst integer (97)inst neon or fp (9a)9fa8acc2cdcfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102043003722500000050729548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038
102043003722500000053629548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038
102043003722500000052729548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100000074011611296349100001003003830038300383003830038
10204300372240000008229539451010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038
102043003722500000016629548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038
102043003722500000014929548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038
102043003722500000018929548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038
102043003722400000012829548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038
10204300372250000006129548251010010010000100100005584277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038
102043003722400000010329548251010010010000100100005004278247130018300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)0307080b18191e1f3a3f4e51inst issue (52)~issue int (53)~issue fp/simd (54)~dispatch int (56)~dispatch fp/simd (57)huge thing int (59)huge thing fp/simd (5b)60696d6edispatch stall (70)scheduler rewind (75)scheduler stall (76)~dispatch op (78)~map op int (7c)~map op fp/simd (7e)~map lookup int (7f)~map lookup fp/simd (81)8283pipeline redirect (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst b.cc (94)inst integer (97)inst neon or fp (9a)9fa0a1a6a8a9acc2c5cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1002430037225000000001262954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038
100243003722400000000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000000016402162229630010000103003830038300383003830038
100243003722500000000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038
100243003722500000000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038
1002430037224000000007262954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038
100243003722500000000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038
1002430037225000000005362954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038
1002430037225000000007262954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038
100243003722500000000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038
100243003722500000000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  pmull v0.8h, v8.8b, v9.8b
  pmull v1.8h, v8.8b, v9.8b
  pmull v2.8h, v8.8b, v9.8b
  pmull v3.8h, v8.8b, v9.8b
  pmull v4.8h, v8.8b, v9.8b
  pmull v5.8h, v8.8b, v9.8b
  pmull v6.8h, v8.8b, v9.8b
  pmull v7.8h, v8.8b, v9.8b
  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 (01)cycle (02)031e3f51inst issue (52)~issue int (53)~issue fp/simd (54)~dispatch int (56)~dispatch fp/simd (57)huge thing int (59)huge thing fp/simd (5b)696d6edispatch stall (70)scheduler rewind (75)scheduler stall (76)~dispatch op (78)~map op int (7c)~map op fp/simd (7e)~map lookup int (7f)~map lookup fp/simd (81)8283pipeline redirect (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst b.cc (94)inst integer (97)inst neon or fp (9a)9fa8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200581500512580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000051105163420036800001002004020040200402004020040
80204200391500412580100100800981008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000051104164520036800001002004020040200402004020040
80204200391500412580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000051104164420036800001002004020040200402004020040
80204200391500412580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000051103164320036800001002004020040200402004020040
802042003915005162580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000051104163420036800001002004020040200402004020040
80204200391500412580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000051104164320036800001002004020040200402004020040
80204200391500412580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000051104164320036800001002004020040200902004020040
80204200391500412580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000051104164420036800001002004020040200402004020040
802042003915003162580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000051104164520036800001002004020040200402004020040
80204200391500412580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000051104164420036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)031e3f51inst issue (52)~issue int (53)~issue fp/simd (54)~dispatch int (56)~dispatch fp/simd (57)huge thing int (59)huge thing fp/simd (5b)60696d6edispatch stall (70)scheduler rewind (75)scheduler stall (76)~dispatch op (78)~map op int (7c)~map op fp/simd (7e)~map lookup int (7f)~map lookup fp/simd (81)8283pipeline redirect (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst b.cc (94)inst integer (97)inst neon or fp (9a)9fa1a8acc5cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8002420048150040258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000005020816242003680000102004020040200402004020040
80024200391502140258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000005038416422003680000102004020040200402004020040
80024200391502440258001010800001080000616400001200202003920039999631001980010208000020160000200392003911800211091010800001000005020416422003680000102004020040200402004020040
8002420039150040258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000005020416422003680000102004020040200402004020089
800242003915012230258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000005020416242003680000102004020040200402004020040
800242003915047140258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000005020416242003680000102004020040200402004020040
8002420039150085258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000005020216342003680000102004020040200402004020040
8002420039150040258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000005020416242003680000102004020040200402004020040
8002420039150040258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000005020416442003680000102004020040200402004020040
80024200391506640258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000005020416422003680000102004020040200402004020040