Apple M1 Microarchitecture Research by Dougall Johnson

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

FSUB (vector, 8H)

Test 1: uops

Code:

  fsub 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 (01)cycle (02)03081e3f4e51inst 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)a8acc2cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
100430372300103254825100010001000398313130183084303724153289510001000200030373037111001100020073116112630100030383038303830383038
100430372200291254825100010001000398313130183037303724153289510001000200030373037111001100020073116112630100030383038303830383038
100430372201261254825100010001000398313130183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
10043037230061254825100010001000398313130183037303724153289510001163200030373037111001100003073116112630100030383038303830383038
10043037220061254825100010001000398313130183037303724153289510001000200030373037111001100003073116112630100030383038303830383038
100430372200612548251000100010003983131301830373037241532895100010002000303730371110011000012073116112630100030383038303830383038
10043037230061254825100010001000398313130183037303724153289510001000200030373037111001100006073116112630100030383038308630853038
10043037220061254825100010001000398313130183037303724153289510001000200030373037111001100040073116112630100030383038303830383038
10043037230061254825100010001000398313130183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
10043037230061254825100010001000398313030183037303724153289510001000200030373037111001100006073116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  fsub 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 (01)cycle (02)03191e3f4e51inst 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)9fa8c5cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204300372240012429548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
10204300372250050229548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037224006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
10204300372250072629548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
10204300372250072629548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038

1000 unrolls and 10 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)9fa8accfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024300372250962954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010006402162329630010000103003830038300383003830038
10024300372240612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
10024300372250666629548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100156402162229630010000103003830038300383003830038
10024300372250612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010006403162229630010000103003830038300383003830038
10024300372250612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
10024300372240612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010006403162229630010000103008330038300383003830038
10024300372250612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010006403162229630010000103003830038300383003830038
1002430037225032922954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010106402162229630010000103003830038300383003830038
10024300372250612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010006403162229630010000103003830038300383003830038
10024300372250612953025100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010006663162229630310000103008630086300383003830038

Test 3: Latency 1->3

Code:

  fsub 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 (01)cycle (02)03090b18193f4e51inst 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)9fa6a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020430037224000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
10204300372250000124295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037232000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129667100001003003830038300383003830038
102043003722500001746295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038

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)72scheduler 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
1002430037224006129548251001010100001010000504277313130018300373003728287032876710010201000020200003003730037111002110910101000010000640716222963010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313130018300373003728287032876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
1002430037225006129548251001010100001010000504278670130018300373003728287032876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313130018300373003728287032876710010201000020200003003730037111002110910101000010000640316222963010000103003830038300383003830038
1002430037224006129548251001010100001010000504277313130018300373003728287032876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313130018300373003728287032876710010201000020200003003730037111002110910101000010000640316222963010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313130018300373003728287032876710010201000020200003003730037111002110910101000010100640316222963010000103003830038300383003830038
10024300372240080729548251001010100001010000504277313130018300373003728287032876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313130018300373003728287032876710010201000020200003003730037111002110910101000010000640316222963010000103003830038300383003830038
10024300372250042429548251001010100001010000504277313130018300373003728287032876710010201000020200003003730037111002110910101000010000640316222963010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  fsub v0.8h, v8.8h, v9.8h
  fsub v1.8h, v8.8h, v9.8h
  fsub v2.8h, v8.8h, v9.8h
  fsub v3.8h, v8.8h, v9.8h
  fsub v4.8h, v8.8h, v9.8h
  fsub v5.8h, v8.8h, v9.8h
  fsub v6.8h, v8.8h, v9.8h
  fsub 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 (01)cycle (02)030b191e3f51inst 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)9facbranch mispredict (cb)cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
802042005815000041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000511031622200360800001002004020040200402004020040
802042003915000041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000511021622200360800001002004020040200402004020040
802042003915000041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000511021622200360800001002004020040200402004020040
802042003915000041258010010080000100800005006400000200202003920115997339997801002008000020016000020039200391180201100991001008000010000511021622200360800001002004020040200402004020040
802042003915000041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000511021622200360800001002004020040200402004020040
802042003915000041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000511021622200360800001002004020040200402004020040
802042003915000041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000511021622200360800001002004020040200402004020040
802042003915000041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000511021622200360800001002004020040200402004020040
802042003915000041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000511021622200360800001002004020040200402004020040
802042003915000041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000511021622200360800001002004020040200402004020040

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)5e60696d6edispatch stall (70)72scheduler 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)9fa8acc2c5cfd2d5d6ddinst fetch restart (de)e0? int output thing (e9)ea? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242004815004025800101080000108000050640000212002020039200399996031001980010208000020160000200392003911800211091010800001000005020041643200360080000102004020040200402004020040
800242003915004025800101080000108000050640000002002020039200399996031001980010208000020160000200392003911800211091010800001000005020041644200360080000102004020040200402004020040
800242003915004025800101080000108000050640000002002020039200399996031001980010208000020160000200392003911800211091010800001000005020041644200360080000102004020040200402004020040
8002420039150059925800101080000108000050640000002002020039200399996031001980010208000020160000200392003911800211091010800001000005020051655200360080000102004020040200402004020040
800242003915004025800101080000108000050640000002002020039200399996031001980118208000020160000200392003911800211091010800001000005020041644200360080000102004020040200402004020040
800242003915004025800101080000108000050640000002002020039200399996031001980010208000020160000200392003911800211091010800001000005020041645200360080000102004020040200402004020040
800242003915004025800101080000108000050640000002002020039200399996031001980010208000020160000200392003911800211091010800001000005020071676200360080000102004020040200402004020040
8002420039150040258001010800001080000506400000020020200392003999960310019800102080000201600002003920039118002110910108000010000050200516352003606980000102004020040200402004020040
800252003915008225800101080000108000050640000002002020089200399996031001980010208000020160000200392003911800211091010800001000005020041643200360080000102004020040200402004020040
800242003914904025800101080000108000050640000002002020039200399996031001980010208000020160000200392003911800211091010800001000005020041624200360080000102004020040200402004020040