Apple M1 Microarchitecture Research by Dougall Johnson

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

SQDMULL (by element, D)

Test 1: uops

Code:

  sqdmull d0, s0, v1.s[1]
  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)a0a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
1004303723061254825100010001000398313130183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303723061254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
10043037231861254825100010001000398313130183037303724153289510001168200030373037111001100000073116112630100030383038303830383038
10043037231861254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303723061254825100010001000398313130183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
10043037221561254825100010001000398313130183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303723061254825100010001000398313130183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303722061254825100010001000398313130183037303724193289510001000200030373037111001100000073116112630100030383038303830383038
10043037222161254825100010001000398313130183037303724153289510001000200030853037111001100000073116112630100030383038303830383038
10043037230103254825100010001000398313130183037303724153289510001000200030373037111001100000073116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  sqdmull d0, s0, v1.s[1]
  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)0318191e1f3f4e51inst 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)6061696d6edispatch 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)9fa6a7a8accfd0d5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020430037225000061295482510100100100001001000050042773131230018300373003728265328745101002001000020020000300373003711102011009910010010000100000071021161129634100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773131230018300373003728265328745101002001000020020000300373003711102011009910010010000100000071021161129634100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773131230018300373003728265328745101002001000020020000300373003711102011009910010010000100000071021161129634100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773131230018300373003728265328745101002001000020020000300373003711102011009910010010000100000071021161129634100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773131230018300373003728265328745101002001000020020000300373003711102011009910010010000100000071021161129634100001003003830038300383003830038
1020430037224000061295482510100100100001001000050042773131230018300373003728265328745101002001000020020000300373003711102011009910010010000100000071021161129634100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773131230018300373003728265328745101002001000020020000300373003711102011009910010010000100000071021161129634100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773131230018300373003728265328745101002001000020020000300373003711102011009910010010000100000071021161129634100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773130230018300373003728265328745101002001000020020000300373003711102011009910010010000100000071021161129634100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773131230018300373003728268328745101002001000020020000300373003711102011009910010010000100000071021161129634100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)03181e3f4e51inst 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)9fa0a1a8acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100243003722501261295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010001006402162229630210000103008630086300383008430038
1002430037226012103295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010001006402162229630010000103003830038300383003830038
100243003722500103295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010001006402162229630010000103003830038300383003830038
1002430037225012103295482510010101000010100005042773133001830037300372828732876710312201000020200003003730037111002110910101000010000006402162329630010000103003830038300383003830038
10024300372250061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010000006402162229630010000103003830038300383003830038
10024300372250061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010000006402162229630010000103003830038300383003830038
10024300372250061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010000006402162229630010000103003830038300383003830038
10024300372250061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010000006402162229630010000103003830038300383003830038
10024300372250061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010200006402162229630010000103003830038300383003830038
10024300372250061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010000006402162229630010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  sqdmull d0, s1, v0.s[1]
  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)03080b1e3f4e51inst 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)9fa8acc2cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020430037225000612954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010006607102162229634100001003003830038300383003830038
1020430037225000612954825101251001000010010000500427867003001830037300372826532874510100200100002002000030037300371110201100991001001000010002107102162229634100001003003830038300383003830038
10204300372240006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100012007102162229634100001003003830038300383003830038
10204300372250006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100018907102162229634100001003003830038300383003830038
10204300372250006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100016207102162229634100001003003830038300383003830038
10204300372250006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100017107102162229634100001003003830038300383003830038
10204300372250006129548251010010010000100100005694277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100211707102162229634100001003003830038300383003830038
10204300372250001662954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010009007102162229634100001003003830038300383003830038
10204300372250006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100016207102162229634100001003003830038300383003830038
10204300372250006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100017107102162229634100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)03080b1e3f4e51inst 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? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100243003722510061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640316222963010000103003830038300383003830038
100243003722500061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
100243003722500061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
100243003722500061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
100243003722500061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
100243003722500061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
100243003722500061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
100243003722500061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
100243003722500061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
100243003722500061295482510010101000010100005042773130300183003730037282873287671001020103362020000300373003711100211091010100001000640216222963010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  sqdmull d0, s8, v9.s[1]
  sqdmull d1, s8, v9.s[1]
  sqdmull d2, s8, v9.s[1]
  sqdmull d3, s8, v9.s[1]
  sqdmull d4, s8, v9.s[1]
  sqdmull d5, s8, v9.s[1]
  sqdmull d6, s8, v9.s[1]
  sqdmull d7, s8, v9.s[1]
  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)0308090b18191e1f3f51inst 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)9fa0a1a6a7a8a9acc2c5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200591500000000412580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000020750000511031611200360800001002004020040200402004020040
80204200391500000000412580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000000210000511011611200360800001002004020040200402004020040
8020420039150000000041258010010080084100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000000000000511011611200360800001002004020040200402004020040
8020420039150000000041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000000000000511011611200360800001002004020040200402004020040
8020420039150000000041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000000000000511011611200360800001002004020040200402004020040
8020420039150000000041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000002030000511011611200360800001002004020040200402004020040
8020420039150000000041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000000000000511011611200360800001002004020040200402004020040
802042003915000000004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000001590000511011611200360800001002004020040200402004020040
8020420039150000000041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000000000000511011611200360800001002004020040200402004020040
80204200391500000000412580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000000120000511011611200360800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03080a1e3f51inst 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)6061696d6edispatch 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)9fa6a8accfd0d5d6d9ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200581500004025800121080000108000050640000102002020039200399996310019800102080000201600002003920039118002110910108000010000502001316014112003680000102004020040200402004020040
80024200391500004025800121080000108000050640000102002020039200399996310019800102080000201600002003920039118002110910108000010000502011316015122003680000102004020040200402004020040
800242003915001082258001010800001080000506400000120020200392003910005310019800102080000201600002003920039118002110910108000010000502011316012132003680000102004020040200402004020040
800242003915000082258001010800001080000506400001120020200392003999963100198001020800002016000020039200391180021109101080000100084502001616013152003680000102004020040200402004020040
800242003915000124025800101080000108000050640000112002020039200399996310019800102080000201600002003920039118002110910108000010223502011216013142003680000102004020040200402004020197
800242003915000124025800101080000108000050640000102002020039200399996310019800102080000201600002003920039118002110910108000010038156502001316012132003680000102004020040200402004020040
8002420039150000402580010108000010800005064000001200202003920039999631001980010208000020160000200392003911800211091010800001003350201816011132003680000102004020040200402004020040
8002420039150100402580012108000010800005064000001200202003920039999631001980010208000020160000200392003911800211091010800001002126502011216011132003680000102004020040200402004020040
8002420039150000402580010108000010800005064000011200202003920039999631001980010208000020160000200392003911800211091010800001000050201121601272003680000102004020040200402004020040
80024200391500004025800101080000108000050640000112002020039200399996310019800102080000201600002003920039118002110910108000010040050201716013122003680000102004020040200402004020040