Apple M1 Microarchitecture Research by Dougall Johnson

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

SQRSHL (scalar, D)

Test 1: uops

Code:

  sqrshl d0, d0, d1
  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)a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
100430372406125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372206125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372306125482510001000100039831313018303730372415328951000100020003037303711100110000073116112646100030383038303830383038
100430372306125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372206125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372306125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372306125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372306125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372306125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372206125482510001000100039831313018303730372415328951000100020003037303711100110000073116112659100030383038303830383038

Test 2: Latency 1->2

Code:

  sqrshl d0, d0, d1
  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)030b191e1f3f4e51inst 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)9fa0a6a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204300372250000612954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000007101161129634100001003003830038300383003830038
10204300372331039043529548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000157101161129634100001003003830038300383003830038
1020430037224000061295482510100100100001001000050042773131300183003730037282653287451010020210000200200003003730037111020110099100100100001000001837101161129634100001003003830038300383003830038
10204300372250000612954845101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000007101161129634100001003003830038300383003830038
102043003722400006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100000307101161129634100001003003830038300383003830038
10204300372250000612954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000007101161129634100001003003830038300383003830038
10204300372250000612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000097101161129634100001003003830038300383003830038
10204300372250000612954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000007101161129634100001003003830038300383003830038
10204300372250000612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000037101161129634100001003003830038300383003830038
10204300372320000612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000007101161129632100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)030b18191e1f3f4e51inst 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)9fa1a8a9accfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100243003722500000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000156403163329630010000103003830038300383003830038
10024300372250000061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000036403163329630010000103003830038300383003830038
10024300372250000061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001001066403163329630010000103003830038300383003830038
100243003722500000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000846403163329630010000103003830038300383003830038
1002430037224000006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100001146403163329697010000103003830038300383003830038
10024300372250000061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000096403163329630010000103003830038300383003830038
100243003722500000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000936403163329630010000103003830038300383003830038
100243003722500000985295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000036403163329630010000103003830038300383003830038
1002430037225000006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100002016403163329630010000103003830038300383003830038
10024300372250000061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000036403163329630010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  sqrshl d0, d1, d0
  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)0308090b18191e1f3f4e51inst 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)9fa0a1a6a7a8a9acc2branch mispredict (cb)cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102043003722500000006129548251010010010000100100005004277313030018030037300372826532874510100200100002002000030037300371110201100991001001000010000003000071011611296340100001003003830038300383003830038
102043003722500000006129548251010010010000100100005004277313030018030037300782826532874510100200100002002000030037300371110201100991001001000010000000000071011611296340100001003003830038300383003830038
102043003722500000008929548251010010010000100100005164277313130018030037300372826532874510100200100002002000030037300371110201100991001001000010000000000071011611296340100001003003830038300383003830038
10204300372250000000612954825101001001000010010000500427731303001803003730037282653287451010020010000200200003003730037111020110099100100100001000020201500071011611296340100001003003830038300383003830038
1020430037225001000023229548251010010010000100100005004277313030018030037300372826532874510100200100002002000030037300371110201100991001001000010000001000071011611296340100001003003830038300383003830038
102043003722500000006129548251010010010000100100005004277313030018030037300372826532874510100200100002002000030037300371110201100991001001000010000000000071011611297040100001003003830038300383003830038
102043003722500000006129548251010010010000100100005004277313030018030037300372826532874510100200100002002000030037300371110201100991001001000010000000000071011611296340100001003003830038300383003830038
102043003722500000006129548251010010010000100100005004277313130018030037300372826532874510100200100002002000030037300371110201100991001001000010000000000071011611296340100001003003830038300383003830038
102043003722400000006129548251010010010000100100005004277313130018030037300372826532874510100200100002002000030037300371110201100991001001000010000001060071011611296340100001003003830038300383003830038
102043003722400000006129548251010010010000100100005004277313030018030037300372826532874510100200100002002000030037300371110201100991001001000010000001000071011611296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)0308090b18191e1f3a3f4e51inst 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)9fa0a6a7a8a9acc2c9cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100243003727800000000612954825100101010000101000050427731303001830037300372828732876710608201000020200003003730037111002110910101000010000646006402162229630010000103003830038300383003830038
100243003727800000000612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000006006402162229658010000103008630038300383003830038
1002430037259000000006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000011246006402162229630010000103003830038300383003830038
10024300372600000069880612954825100101010000101000050427731303001830037300372828732876710010201000020213083003730037111002110910101000010000003006402162229630010000103003830038300383003830038
1002430037260000000002733295482510010101000010100005042773130300183022530037282873287671001020100002020000300373003711100211091010100001000000111006402162229630010000103003830038300383003830038
100243003724100000000612954825100101010000101000050427867003001830037300372828732876710010201000020200003003730037111002110910101000010000102880006402242229630010000103003830038300383003830085
10024300372410000012001032954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000100006402162229630010000103003830038300383003830038
1002430037241000000006129548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100001028402126806162229630010000103003830038300383003830038
100243017824100000000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000200006402162229630010000103003830038300383003830038
1002430037232000009007262954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000200006402162229630010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  sqrshl d0, d8, d9
  sqrshl d1, d8, d9
  sqrshl d2, d8, d9
  sqrshl d3, d8, d9
  sqrshl d4, d8, d9
  sqrshl d5, d8, d9
  sqrshl d6, d8, d9
  sqrshl d7, d8, d9
  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)03080b1e3a3f51inst 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
80204200391500015010425801001008000010080000500640000120020200392003999733999780100200800002001600002003920039118020110099100100800001002351103161120036800001002004020040200402004020040
802042003915000240412580100100800001008000050064000012002020039200399973399978010020080000200160000200392003911802011009910010080000100441251101161120036800001002004020040200402004020040
802042003915000004125801001008008810080000500640000120020200392003999733999780100200800002001600002003920039118020110099100100800001001051101161120036800001002004020040200402004020040
802042003915000004125801001008000010080000500640000120020200392003999733999780100200800002001600002003920039118020110099100100800001000051101161120036800001002004020040200402004020040
802042003915000004125801001008000010080000500640000120020200392003999733999780100200800002001600002003920039118020110099100100800001000051101161120036800001002004020040200402004020040
8020420039150000055525801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000051101161120036800001002004020040200402004020040
802042003915000004125801001008000010080000500640000120020200392003999733999780100200800002001600002003920039118020110099100100800001000051101161120036800001002004020040200402004020040
802042003915000004125801001008000010080000500640000120020200392003999733999780100200800002001600002003920039118020110099100100800001000051101161120036800001002004020040200402004020040
802042003915000004125801001008000010080000500640000120020200392003999733999780100200800002001600002003920039118020110099100100800001000051101161120036800001002004020040200402004020040
802042003915000004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000051101161120036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)030b18191e1f3f51inst 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)9fa0a6a8a9acc2cfd0d5d6ddinst fetch restart (de)e0eb? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200481500000040258001010800001080000506400000120020200392003999963100198001020800002016000020039200391180021109101080000100000120502005165320036080000102004020040200402004020040
8002420039150000004025800101080000108000050640000012002020039200399996310019800102080000201600002003920039118002110910108000010000000502005163520036080000102004020040200402004020040
8002420039150000005025800101080000108000050640000012002020039200399996310019800102080000201600002003920039118002110910108000010000000502005163520036080000102004020040200402004020040
8002420039150000004025800101080000108000050640000012002020039200399996310019800102080000201600002003920039118002110910108000010000000502005163520036080000102004020040200402004020040
8002420039150000004025800101080000108000050640000012002020039200399996310019800102080000201600002003920039118002110910108000010000000502005165320036080000102004020040200402004020040
80024200391500000017725800101080000108000050640000012002020039200399996310019800102080105201600002003920039118002110910108000010001000502005165320036080000102004020040200402004020040
80024200391500000040258009010800001080000506400000120020200392003999963100198001020800002016000020039200391180021109101080000100010120502003163520036080000102004020040200402004020040
800242003915600000803258001010800001080000506400000120020200392003999962510019800102080000201600002003920039118002110910108000010000000502003163520036080000102004020040200402004020040
8002420039150000006125800101080000108000050640000002002020039200399996310019800102080000201600002003920039118002110910108000010000000502005165320036080000102004020040200402004020040
8002420039150000004025800101080000108000050640000002002020039200399996310019800102080000201600002003920039118002110910108000010001000502003163520036080000102004020040200402004020040