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, 2S)

Test 1: uops

Code:

  fcadd v0.2s, v0.2s, v1.2s, #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)03071e3f4e51inst 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
1004303723006125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303723006125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303723006125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303723006125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
10043037220025125482510001000100039831313018303730372415328951000100020003037303711100110002073116112630100030383038303830383038
1004303722006125482510001000100039831313018303730372415328951000100020003037303711100110000073116222627100030383038303830383038
1004303723006125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303723006125482510001000100039831313018303730372415328951000100020003037303711100110000073116222630100030383038303830383038
1004303722006125482510001000100039831313018303730372415328951000100020003037303711100110000073216112630100030383038303830383038
1004303722106125482510001000100039831313018303730372417328951000100020003037303711100110000073116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  fcadd v0.2s, v0.2s, v1.2s, #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)0318191e3a3f4e51inst 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
102043003722500906129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100137101161129634100001003003830038300383003830038
102043003722500006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100237101161129634100001003003830038300383003830038
102043003722500006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100337101161129634100001003003830038300383003830038
102043003722500006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100137101161129634100001003003830038300383003830038
102043003722512837181229548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100437101161129634100001003003830038300383003830038
102043003722500006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100197101161129634100001003003830038300383003830038
102043003722500006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100067101161129634100001003003830038300383003830038
1020430037224000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001007157101161129634100001003003830038300383003830038
102043003722500006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100237101161129634100001003003830038300383003830038
102043003722400006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100137101161129634100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)03043a3f4e51inst 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
1002430037224026229548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000101364461612102963010000103003830038300383003830038
100243003722502231295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001013644111612112963010000103003830038300383003830038
100243003722502622954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010223644111611112963010000103003830038300383003830038
10024301802250262295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001023644111610102963010000103003830038300383003830038
10024300372250262295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001043644111611102963010000103003830038300383003830038
1002430037224025524295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001016644101610112963010000103003830038300383003830038
10024300372250262295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001023644101611112963010000103003830038300383003830038
1002430037225026229548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000103015644816882963010000103003830038300383003830038
10024300372250262295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001020644111611102963010000103003830038300383003830038
10024300372250262295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001013644121611122963010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  fcadd v0.2s, v1.2s, v0.2s, #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)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)9fa0a6a8a9acc2c5cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204300372250822954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000406007101161129634100001003003830038300383003830038
10204300372250892954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000100007101161129634100001003003830038300383003830038
10204300372250612954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000100007101161129634100001003003830038300383003830038
10204300372250612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000100007101161129634100001003003830038300383003830038
102043003722501242954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010020140407101161129634100001003003830038300383003830038
102043003722512612954825101001041000810010000516427832903005430037300372826592874510100206100002002065630037300371110201100991001001000010000000007101161129634100001003003830038300383003830038
10204300372250612954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000103007101161129634100001003003830038300383003830038
10204300372250612954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000003007101161129634100001003003830038300383003830038
102043003722501032954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000203007101161129634100001003003830038300383003830038
10204300372250612954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000200007101161129634100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)03081e1f3f4e51inst 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)9fa0a8a9accfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100243003722500061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000006402162229630010000103003830038300383003830038
100243003722500061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000006402162229630010000103003830038300383003830038
100243003722500061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000006402162229630010000103003830038300383003830038
100243003722500061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000036402162229630010000103003830038300383003830038
100243003722500061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000028736402162229630010000103003830038300383003830038
100243003722500061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000006402162229630010000103003830038300383003830038
100243003722400061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000006402162229630010000103003830038300383003830038
100243003722400082295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000006402162229630010000103003830038300383003830038
100243003722500061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000006402162229630010000103003830084300383003830038
100243003722500061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000006402162229630010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  fcadd v0.2s, v8.2s, v9.2s, #90
  fcadd v1.2s, v8.2s, v9.2s, #90
  fcadd v2.2s, v8.2s, v9.2s, #90
  fcadd v3.2s, v8.2s, v9.2s, #90
  fcadd v4.2s, v8.2s, v9.2s, #90
  fcadd v5.2s, v8.2s, v9.2s, #90
  fcadd v6.2s, v8.2s, v9.2s, #90
  fcadd v7.2s, v8.2s, v9.2s, #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)0308181e3a3f51inst 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
80204200591500024246258010012480193100800005006407862002020039200399973399978010020080000200160206200392003911802011009910010080000100005114111610920036800001002004020040200402004020040
8020420039150004322462580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000051149164920036800001002004020040200402004020040
80204200391500002462580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000051149169420036800001002004020040200402004020040
80204200391500002462580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000051144169920036800001002004020040200402004020040
80204200391500002462580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000051149169920036800001002004020040200402004020040
8020420039150003332462580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000051149167720036800001002004020040200402004020040
80204200391500002462580100100800001008000050064000020020200392008899733999780100200800002001600002003920039118020110099100100800001000051149169920036800001002004020040200402004020040
80204200391500202462580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000051149167720036800001002004020040200402004020040
80204200391500002462580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000051149169920036800001002004020040200402004020040
80204200391500040824625801001008000010080000500640000200202003920039997339997801002008000020016000020039200391180201100991001008000010000511441610920036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)0307080b18191e1f3f51inst 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)9fa0a1a6a7a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242004815000000004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100000903050204163520036080000102004020040200402004020040
800242003915000000004025800101080000108000050640000120020200392003999963100198001020800002016000020088200901180021109101080000100000009050205163520036080000102004020040200402004020040
800242003915000000004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100000500050205164420036080000102004020040200402004020040
800242003915001000004025800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100000700050204164520036080000102004020040200402004020040
8002420039150000001204025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100000700050204165520036080000102004020040200402004020040
800242003915000000004025800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100000400050203163520036080000102014420040200402004020040
800242003915000000004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100000300050204164420036080000102004020040200402004020040
800242003915000000004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100000300050203165320036080000102004020040200402004020040
800242003915000000004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100000500050205165320036080000102004020040200402004020040
800242003915000000004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100000100050204164420036080000102004020040200402004020040