Apple M1 Microarchitecture Research by Dougall Johnson

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

FCADD (vector, 2D)

Test 1: uops

Code:

  fcadd v0.2d, v0.2d, v1.2d, #90
  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)031e3f4e51inst 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)a6a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
1004303723082254825100010001000398313130183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
100430372321661254825100010001000398313130183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
1004303723061254825100010001000398313130183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
1004303723061254825100010001000398313130183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
1004303722061254825100010001000398313130183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
10043037220254254825100010001000398313130183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
1004303723061254825100010001000398313130183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
1004303722061254825100010001000398313130183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
1004303723061254825100010001000398313130183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
1004303723061254825100010001000398313130183037303724153289510001000200030373037111001100001073216222630100030383038303830383038

Test 2: Latency 1->2

Code:

  fcadd v0.2d, v0.2d, v1.2d, #90
  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)03080b18191e1f3a3f4e51inst 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)9fa8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102043003722500000006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722500000006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722500000006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
10204300372240013258008229548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722500000006129548251010010010000100100005004277313130018300373003728276328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225000000010329548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722500000006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722500000006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300713003830038
1020430037224000000024129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100027837101162129668100001003003830038300383003830084
102043003722501000006129548251010010010000100100005004277313130018300373003728265328745105792001032820020000300373013211102011009910010010000100007101161129634100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)031e3a3f4e51inst 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)9fa0a6a8acc5branch mispredict (cb)cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024300372250011932954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000300640216222963010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038
1002430037225001682954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830037300372828732876710160201000020200003003730037111002110910101000010000001640216222963010000103003830038300383003830038
100243003722400612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038
1002430037225003462954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038
100243003722500612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  fcadd v0.2d, v1.2d, v0.2d, #90
  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)03070a1e3f4e51inst 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)9fa8acc5cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020430037224000612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000071021622296340100001003003830038300383003830038
102043003722500186612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000071021622296340100001003003830038300383003830038
1020430037225000612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000071021622296340100001003003830038300383003830038
1020430037225000612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000071021622296340100001003003830038300383003830038
10204300372250012612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000071021622296340100001003003830038300383003830038
10204300842250006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100000710316222963421100001003003830038300383003830038
1020430037225000612954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010030071021622296340100001003003830038300383003830038
1020430037225000612954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000071021622296340100001003003830038300383003830038
1020430037225000612954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000071021622296340100001003003830038300383003830038
1020430037225000612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000071021622296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)030b18191e1f3f4e51inst 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)9fa6a8a9acc2cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024300372250000061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000000640316332963010000103003830038300383003830038
10024300372250000061295482510010101000010100005042773131300183003730037282873287671001024100002020000300373003711100211091010100001000000640316432966810000103003830038300383003830038
10024300372250000061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000000640316332963010000103003830038300383003830038
10024300372250000061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000000640316332963010000103003830038300383003830038
10024300372250000061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000000640316332963010000103003830038300383003830038
10024300372250000061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000000640316332963010000103003830038300383003830038
10024300372250000061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000000640316332963010000103003830038300383003830038
10024300372240000061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000000640316132963010000103003830038300383003830038
100243003722500000443295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000000640316332963010000103003830038300383003830038
10024300372250000061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000000640316332963010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  fcadd v0.2d, v8.2d, v9.2d, #90
  fcadd v1.2d, v8.2d, v9.2d, #90
  fcadd v2.2d, v8.2d, v9.2d, #90
  fcadd v3.2d, v8.2d, v9.2d, #90
  fcadd v4.2d, v8.2d, v9.2d, #90
  fcadd v5.2d, v8.2d, v9.2d, #90
  fcadd v6.2d, v8.2d, v9.2d, #90
  fcadd v7.2d, v8.2d, v9.2d, #90
  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)696b6d6edispatch 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)9fa8accdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8020420039150041258010010080000100800005006400002002002003920039997339997801002008000020016000020039200391180201100991001008000010000051103161120036800001002004020040200402004020040
802042003915001742258010010080000100800005006400002002002003920039997339997801002008000020016000020039200391180201100991001008000010000051101161120036800001002004020040200402004020040
80204200391500923258010010080000100800005006400002007102003920039997339997801002008000020016000020039200391180201100991001008000010000051101161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400002002002003920039997339997801002008000020016000020039200391180201100991001008000010000051101161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400002002002003920039997339997801002008000020016000020039200391180201100991001008000010000051101161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400002002002003920039997339997801002008000020016021020039200391180201100991001008000010000051101161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400002002002003920039997339997801002008000020016000020039200391180201100991001008000010000051101161120036800001002004020040200402004020040
80204200391500516258010010080000100800005006400002002002003920039997339997801002008000020016000020039200391180201100991001008000010000051101161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400002002002003920039997339997801002008000020016000020039200391180201100991001008000010000051101161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400002002002003920039997339997801002008000020016000020039200391180201100991001008000010000051101161120036800001002004020093200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)0308090b191e1f3f51inst 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)9fa0a1a6a8acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242003915000000096258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000000050205165520036080000102004020040200402004020040
80024200391500000001043258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000000450205164520036080000102004020040200402004020040
800242003915000000074258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000000050205165420036080000102004020040200402004020040
800242003915000000068258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000000050205164520036080000102004020040200402004020040
800242003915000000068258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000000050205165420036080000102004020040200402004020040
800242003915000000068258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000000050205165420036080000102004020040200402004020040
800242003915000000068258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000006050205165420036080000102004020040200402004020040
800242003915000000068258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000000050205165520036080000102004020040200402004020040
800242003915000000068258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000000050204165420036080000102004020040200402004020040
800242003915000000068258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000010050205164520036080000102004020040200402004020040