Apple M1 Microarchitecture Research by Dougall Johnson

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

SRSHL (vector, 8H)

Test 1: uops

Code:

  srshl 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)0304191e1f3a3f4e51inst issue (52)~issue fp/simd (54)~dispatch fp/simd (57)huge thing fp/simd (5b)696d6edispatch 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)a6accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
100430372300002822548251000100010003983133018303730372415328951000100020003037303711100110000077416442630100030383038303830383038
1004303722000021032548251000100010003983133018303730372415328951000100020003037303711100110000077416442630100030383038303830383038
100430372310002822548251000100010003983133018303730372415328951000100020003037303711100110000077416442630100030383038303830383038
100430372210002822548251000100010003983133018303730372415328951000100020003037303711100110000077416442630100030383038303830383038
100430372210902822548251000100010003983133018303730372415328951000100020003037303711100110000077416442630100030383038303830383038
100430372310002822548251000100010003983133018303730372415328951000100020003037303711100110000077416442630100030383038303830383038
100430372210002822548251000100010003983133018303730372415328951000100020003037303711100110000077416442630100030383038303830383038
100430372310002822548251000100010003983133018303730372415328951000100020003037303711100110000077416442630100030383038303830383038
1004303723100021982548251000100010003983133018303730372415328951000100020003037303711100110000077416442630100030383038303830383038
1004303723100021032548251000100010003983133018303730372415328951000100020003037303711100110000077416442630100030383038303830383038

Test 2: Latency 1->2

Code:

  srshl 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)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)9fa6a8acc2c5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102043003722506129548251010010010000100100005004277313030018300373003728272728740101002001000820020016300373003711102011009910010010000100000011171801600296470100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313030018300373003728272728740101002001000820020016300373003711102011009910010010000100000011171801600296460100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100016000071011611296340100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071011611296340100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071011611296340100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071011611296340100001003003830038300383003830038
102043003722406129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071011611296340100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071011611296340100001003003830038300383003830038
102043003722509429548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071011611296340100001003003830038300383003830038
102043003722406129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071011611296340100001003003830038300383003830038

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)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)9fa0a1a8a9acc2cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000640216122963010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010001000640216222963010000103003830038300383003830038
1002430037225002852954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038
10024300372250264612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038
100243003722500822954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038
100243003722514488612954825100101010000101000050427731313001830037300372828772876710010201000020200003003730037111002110910101000010000000640216222977410000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100000120640216222963010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  srshl 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)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)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)9faccfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020430037225061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010007101161129634100001003003830038300383003830038
1020430037224961295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010007101161129634100001003003830038300383003830038
1020430085225061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001015050042773133001830037300372826532874510100200100002002000030037300851110201100991001001000010007101161129634100001003003830038300383003830038
1020430037225061295482510100100100071001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010007101161129634100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)03070809181e1f3f4e51inst 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? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024300372250000006129548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038
10024300372250000006129548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038
10024300372240000006129548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038
10024300372250000006129548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038
10024300372250000006129548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038
10024300372250000006129548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038
10024300372250000006129548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038
10024300372250000006129548251001010100001010000504277313130018300853003728287328767100102010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038
10024300372250000006129548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038
10024300372250000006129548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100006403163329630010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  srshl v0.8h, v8.8h, v9.8h
  srshl v1.8h, v8.8h, v9.8h
  srshl v2.8h, v8.8h, v9.8h
  srshl v3.8h, v8.8h, v9.8h
  srshl v4.8h, v8.8h, v9.8h
  srshl v5.8h, v8.8h, v9.8h
  srshl v6.8h, v8.8h, v9.8h
  srshl 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)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)9fa0a1a6a7a8a9acc2cdcfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
802042005915000000540412580100100800001118000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000000000511021611200360800001002004020040200402004020040
802042003914900000360412580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000000000511011611200360800001002004020040200402004020040
802042003915000000210412580100100800001008000050064000012002020039200399973399978010020080000200160000200392009811802011009910010080000100000000000511011611200360800001002004020040200402004020040
802042003915000000240412580100100800001008000050064000012002020039200399973399978010020080000200160000200392003911802011009910010080000100000000000511011611200360800001002004020040200402004020040
802042003915000000510412580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000000000511011611200360800001002004020040200402004020040
80204200391500000090412580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000000000511011611200360800001002004020040200402004020040
802042003915000000600412580100100800001008000050064000012002020039200399973399978010020080000200160000200392003911802011009910010080000100000000000511011611200360800001002004020040200402004020040
80204200391500000000412580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000000000511011611200360800001002004020040200402004020040
802042003915000000540412580100100800001008000050064000012002020039200399973399978010020080000200160000200392003911802011009910010080000100000000000511011611200360800001002004020040200402004020040
802042003915000000570412580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000000000511011612200360800001002004020040200402004020040

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)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
80024200591506640258001010800001080000506400001200202003920039999531001980010208000020160000200392003911800211091010800001000502012161032003680000102004020040200402004020040
80024200391500402580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010005020616642003680000102004020040200402004020040
80024200391505104025800101080000108000050640000120020200392003999923100198001020800002016000020039200391180021109101080000100050207161142003680000102004020040200402004020040
800242003915004025800101080000108000050640000120020200392003999963100198012220800002016000020039200391180021109101080000100050207165122003680000102004020040200402004020040
8002420039150040258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001005805020516652003680000102004020040200402004020040
8002420039150040258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001010502010161042003680000102004020040200402004020040
800242003915004025800101080000108000050640000120020200392003999953100198001020800002016000020039200391180021109101080000100050206165102003680000102004020040200402004020040
80024200391500402580010108000010800005064000012002020039200399995310019800102080000201600002003920039118002110910108000010005020516492003680000102004020040200402004020040
80024200391500402580010108000010800005064000012002020039200399995310019800102080000201600002003920039118002110910108000010005020516572003680000102004020040200402004020040
800242003915004025800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100050205165112003680000102004020040200402004020040