Apple M1 Microarchitecture Research by Dougall Johnson

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

FADD (vector, 2D)

Test 1: uops

Code:

  fadd v0.2d, v0.2d, v1.2d
  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)03090b18191e1f3f4e51inst 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)a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
10043037230000006125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
10043037230000008225482510001000100039831303018303730372415328951000100020003037303711100110001073116112630100030383038303830383038
10043037230000006125482510001000100039831303018303730372415328951000100020003037303711100110003373116112630100030383038303830383038
10043037230000006125482510001000100039831313018303730372415328951000100020003037303711100110001073116112630100030383038303830383038
10043037230000006125482510001000100039831303018303730372415328951000100020003037303711100110001073116112630100030383038303830383038
10043037220000006125482510001000100039831303018303730372415328951000100020003037303711100110000073116112700100030383038303830383038
10043037230000006125482510001000100039831313018303730372415328951000100020003037303711100110001073116112630100030383038303830383038
10043037230000006125482510001000100039831313018303730372415328951000100020003037303711100110001073116112630100030383038303830383038
10043037230000006125482510001000100039831303018303730372415328951000100020003037303711100110002073116112630100030383038303830383038
10043037230000006125482510001000100039831303018303730372415328951000100020003073303711100110000073116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  fadd v0.2d, v0.2d, v1.2d
  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)031e3f4e51inst 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? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204300372250612954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010004507101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000052842773130300183008530037282653287451010020010000200200003003730037111020110099100100100001000607101161229634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001001307101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001001307101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300183003730037282653287451072820010000214200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830179
1020430037225061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)031e1f3f4e51inst 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)60696b6d6edispatch 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
100243003722500612954825100101010000101000050427731303001803003730037282873287671001020100002020000300373003711100211091010100001000640316222963010000103003830038300383003830038
100243003722500612954825100101010000101000050427731303001803003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300853003830038
100243003722500612954825100101010000101000050427731303001803003730037282873287671001020100002020346300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372250052329530251001010100001010000504277313030018030037300372828732876710010201000020200003003730037111002110910101000010018640216222963010000103003830038300383003830038
100243003722500612954825100101010000101000050427731303001803003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
1002430037225007262954825100101010000101000050427731303001803003730037282873287671001020100002020000300373003741100211091010100001000640216222963010000103003830038300383003830038
1002430037225007262954825100101010000101000050427731303001803003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
100243003722500612954825100101010000101000050427731303001803003730037282873287671001020100002020000300373003711100211091010100001020640216222963010000103003830038300383003830038
100243003722500612954825100101010000101000050427731303001803003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
100243003722500612954825100101010000101000050427731303001803008030037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  fadd v0.2d, v1.2d, v0.2d
  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)031e3f4e51inst 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)9fa9accfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020430037225061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
1020430037224061295482510100100100081001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
1020430037224061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730132111020110099100100100001000071011611296340100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
1020430085225061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038

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)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)9fa8acbranch mispredict (cb)cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1002430037225006129548251001010100001010000504277313300180300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038
10024300372250073129548251001010100001010000504277313300180300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313300180300373003728287328767100102010000202000030037300375110021109101010000100006402162229630010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313300180300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038
10024300372250061295482510010101000010100005042773133001803003730037282873287671001020100002020000300373003711100211091010100001018006402162229630010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313300180300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038
10024300372250011729548251001010100001010000504277313300180300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313300180300373003728287328767100102010000202000030037301791110021109101010000100006402162229630010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313300180300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313300180300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  fadd v0.2d, v8.2d, v9.2d
  fadd v1.2d, v8.2d, v9.2d
  fadd v2.2d, v8.2d, v9.2d
  fadd v3.2d, v8.2d, v9.2d
  fadd v4.2d, v8.2d, v9.2d
  fadd v5.2d, v8.2d, v9.2d
  fadd v6.2d, v8.2d, v9.2d
  fadd v7.2d, v8.2d, v9.2d
  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)03090b191e3f51inst 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)9fa6a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200591500005119725801001008000010080000500640000200202003920039997339997801002008000020016000020039200391180201100991001008000010000051102161120036800001002004020040200402004020040
8020420039150000304125801001008000010080000500640000200202003920039997339997801002008000020016000020039200391180201100991001008000010000051101161120036800001002004020040200402004020040
802042003915000024414280211100800001008000050064000020061200392003999733999780440200800002001600002003920039118020110099100100800001000047851101161120078800001002004020040200402004020040
802042003915001028841258010010080000100800005006400002002020039200399973310049801002008000020016000020039200391180201100991001008000010000051101161120036800001002004020246200402004020040
8020420039150000304125801001008000010080000500640000200202003920039997339997801002008000020016000020039200391180201100991001008000010000051101161120036800001002004020040200402004020040
8020420039150000454125801001008000010080000500640000200202003920039997339997801002008000020016000020039200391180201100991001008000010001351101161120036800001002004020040200402025120040
8020420039150000484125804061008000010080000500640000200202003920039997339997801002008000020016000020039200391180201100991001008000010000351101161120036800001002004020040200402004020198
80204200391501006075125801001008000010080000500640000200202003920039997339997801002008000020016000020039200391180201100991001008000010000051101161120036800001002004020040200402004020040
802042003915000006225801001008000010080000500640000200202003920039997339997801002008000020016000020039200391180201100991001008000010000051101161120036800001002004020040200402004020040
802042003915000004125801001008000010080210500640000200202003920039997339997801002008000020016000020039200391180201100991001008000010000051101161120036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)031e1f3f51inst 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
8002420048151240402580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010005020316112003680000102004020040200402004020040
8002420039150510402580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010035020116112003680000102004020040200402004020040
800242003915030402580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010005020116112003680000102010120040200402004020040
8002420039150450822580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010005020116112003680000102004020040200402004020040
8002420039150270402580010108000010800005064000002002020039200399996310019800102080000201600002003920039218002110910108000010005020116112003680000102004020040200402004020040
800242003915000402580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010005020116112003680000102004020040200402004020040
8002420039150390402580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010005020116112003680000102004020040200402004020040
8002420039150360402580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010005020116112003680000102004020040200402004020040
8002420039150240402580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010005020116112003680000102004020040200402004020040
8002420039150120402580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010005020116112003680000102004020040200402004020040