Apple M1 Microarchitecture Research by Dougall Johnson

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

SQADD (vector, 8B)

Test 1: uops

Code:

  sqadd v0.8b, 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)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)a8cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
10043037230612548251000100010003983130301830373037241532895100010002000303730371110011000073216222630100030383038303830383038
10043037220612548251000100010003983130301830373037241532895100010002000303730371110011000173216222630100030383038303830383038
10043037230842548251000100010003983130301830373037241532895100010002000303730371110011000073216222630100030383038303830383038
10043037230822548251000100010003983130301830373037241532895100010002000303730371110011000073216222630100030383038303830383038
10043037230612548251000100010003983130301830373037241532895100010002000303730371110011000073216222630100030383038303830383038
1004303723121562548251000100010003983130301830373037241572895100010002000303730371110011000073216222630100030383038303830383038
10043037220612548251000100010003983130301830373037241532895100010002000303730371110011000073216222630100030383038303830383038
10043037230612548251000100010003983131301830373037241532895100010002000303730371110011000073216222630100030383038303830383038
10043037230612548251000100010003983130301830373037241532895100010002000303730371110011000073216222630100030383038303830383038
100430372212612548251000100010003983130301830373037241532895100010002000303730371110011000073216222630100030383038303830383038

Test 2: Latency 1->2

Code:

  sqadd v0.8b, 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)030818191e3f4e51inst 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
10204300372240044510329548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722500006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722500006129548251010010010000100101495004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722400006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722500006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225000094329548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225000010329548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722500006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722400006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
10204300372250000612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010001567101161129634100001003003830038300383003830038

1000 unrolls and 10 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)60696b6d6edispatch 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)9fa0a1a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024300372240000000612954825100101010000101000050427731303001803003730084282870328767100102010000202000030037300371110021109101010000100000006403162229630010000103003830038300383003830038
10024300372240000000612954825100101010000101000050427731303001803003730037282870328767100102010000202000030037300371110021109101010000100000006402162229630010000103003830038300383003830038
10024300372250000000612954825100101010000101000050427846903001803003730037282870328767100102010000202000030037300371110021109101010000100000006402162229630010000103003830038300383003830038
10024300372250000000612954825100101010000101000050427731303001833003730037282870328767100102010000202000030037300371110021109101010000100000006402483529774110000103027230273302743027530086
10024300852251000000612954825100101010000101000050427731303001803003730037282870328767100102010000202000030037300371110021109101010000100000006402162229630010000103003830038300383003830038
10024300372250000000612954825100101010000101000050427731313001803003730037282870328767100102010000202000030037300371110021109101010000100010306402162229630010000103003830038300383003830038
10024300372250000000612954825100101010000101000050427731313001803003730037282870328767100102010000202000030037300371110021109101010000100000006402162229630010000103003830038300383003830038
10024300372250000000612954825100101010000101000050427731303001803003730037282870328767100102010000202000030037300371110021109101010000100000006402162229630010000103003830038300383003830038
10024300372250000000612954825100101010000101000050427731313001803003730037282870328767100102010000202000030037300371110021109101010000100000006402162229630010000103003830061300383003830038
10024300372250000000612954825100101010000101000050427731303001803003730037282870328767100102010000202000030037300371110021109101010000100000006402162229630010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  sqadd v0.8b, 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)03080b18191e3f4e51inst 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)9fa0a1a6a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204300372240000061295482510100100100001001000050042773131300180300373003728265328745101002001000020020000300373003711102011009910010010000100000003071011611296340100001003003830038300383003830038
1020430037224000006129548251010010010000100100005004277313130018030037300372826532874510100200100002002000030037300371110201100991001001000010000000129071011611296340100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773131300180300373003728265328745101002001000020020000300373003711102011009910010010000100000001740710116112963415100001003003830038301313003830038
1020430037225002413261295398310154100100001291000054742773131300900302733021628265142878110731204106662282231830466303717110201100991001001000010024214269450776116212975725100001003003830185302773008530085
1020430037225105107792954825101241271000010010298500427731313001803003730037282653287451010020010000200200003003730037111020110099100100100001000000000710116112963420100001003003830038300383003830038
1020430037225010133128295482510100100100001001000050042773131300180300373003728265328745101002001000020020000300373003711102011009910010010000100000003071011611296340100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773131300180300373003728265328745101002001000020020000300373003711102011009910010010000100000000071011611296340100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773131300180300373003728265328745101002001000020020000300373003711102011009910010010000100000006071011611296340100001003003830038300383003830038
10204301312250000061295482510100100100001001000050042773131300180300373003728265328745101002001000020020000300373003711102011009910010010000100000003071011611296340100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773131300180300373003728265328745101002001000020020000300373003711102011009910010010000100000003071011611296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)03081e3f4e51inst 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)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)9fa8acc2c5cdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024300372250061295482510010101000010100005042773133001830037300372828703287671001020100002020000300373003711100211091010100001010000640616332963010000103003830038300383003830038
10024300372250061295482510010101000010100005042773133001830037300372828703287671001020100002020000300373003711100211091010100001000000640316332963010000103003830038300383003830038
10024300372260061295486210010101000010100005042773133001830037300372828703287671001020100002020000300373003711100211091010100001003000640316332963010000103003830038300383003830038
10024300372250061295482510010101000010100005042773133001830037300372828703287671001020100002020000300373003711100211091010100001000000640316332963010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313300183003730037282870328767100102010000202000030037300371110021109101010000100141000640316332963010000103003830038300383003830038
100243003722500612954825100191010000101000050427731330018300373003728287032876710010201000020200003003730037111002110910101000010656000640316332963010000103003830038300383003830038
100243003722500536295482510010101000010100005042773133001830037300372828703287671001020100002020000300373003711100211091010100001000000640316332963010000103003830038300383003830038
10024301302250061295482510010101000010100005042773133001830037300372828703287671001020100002020000300373003711100211091010100001000000640316332963010000103003830038300383003830038
100243003722500726295482510010101000010100005042773133001830037300372828703287671001020100002020000300373003711100211091010100001000000640316332963010000103003830038300383003830038
10024300372240053629548251001010100001010000504277313300183003730037282870328767100102010000202000030037300371110021109101010000100168000640316332963010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  sqadd v0.8b, v8.8b, v9.8b
  sqadd v1.8b, v8.8b, v9.8b
  sqadd v2.8b, v8.8b, v9.8b
  sqadd v3.8b, v8.8b, v9.8b
  sqadd v4.8b, v8.8b, v9.8b
  sqadd v5.8b, v8.8b, v9.8b
  sqadd v6.8b, v8.8b, v9.8b
  sqadd v7.8b, 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)03081e1f3f51inst 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)9fa1a8acc2c5cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
802042004815000085258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000600511041611200360800001002004020040200402004020040
8020420039150101044125801001008000010080000500640000120020200392003999733999780100200800002001600002003920039118020110099100100800001000012900511011611200360800001002004020040200402004020040
80204200391500007025801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000381800511011611200360800001002004020040200402004020040
802042003915000041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010001813200511011611200360800001002004020040200402004020040
8020420039150000412580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100022000511011611200360800001002004020040200402004020040
80204200391501006225801001008000010780000500640000120020200992009199733999780100200800002001600002003920093118020110099100100800001002181205110116112003615800001002009920040200402004020040
80204200391500004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000111100511011611200360800001002004020040200402004020040
802042003915000041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010002300511011611200360800001002004020040200402004020040
8020420039150012041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000900511011611200360800001002004020040200402004020040
8020420039150000412580100100800001008000050064000002002020039200399973399978010020080208200160000200392025011802011009910010080000100017300511011611200360800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03070b191e3f51inst 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)5f60696d6edispatch 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)ea? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200391500000402580010108000010800005064000000200202003920039999631001980010208000020160000200392003911800211091010800001000502021664200360080000102004020040200402004020040
800242003915000004025800101080000108000050640000112002020039200399996310019800102080000201600002003920039118002110910108000010493502021644200360080000102004020040200402004020040
8002420039150000040258001010800001080000506400000120020200392003999963100198001020800002016000020039200391180021109101080000103415502021624200360080000102004020040200402004020040
80024200391500000402580010108000010800005064000000200202003920039999631001980010208000020160000200392003911800211091010800001000502041644200360080000102004020040200402004020040
800242003915000004025800101080000108000050640000002002020039200399996310019800102080000201600002003920039118002110910108000010490502021624200360080000102004020040200402004020040
80024200391500000402580010108000010800005064000000200202003920039999631001980010208000020160000200392003911800211091010800001000502041624200360080000102004020040200402004020040
800242003915000006125800101080000108000050640000002002020039200399996310019800102080000201600002003920039118002110910108000010293502041624200360080000102004020040200402004020040
80024200391500000402580010108000010800005064000001200202003920039999631001980010208000020160000200392003911800211091010800001003502041624200360080000102004020040200402004020040
80024200391500000402580012108000010800005064000001200202003920039999631001980010208000020160000200392003911800211091010800001000502041624200360080000102004020040200402004020040
800242003915000004025800101080000108000050640000002002020039200399996310019800102080000201600002003920039118002110910108000010156502041636200360080000102004020040200402004020040