Apple M1 Microarchitecture Research by Dougall Johnson

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

MUL (vector, 8H)

Test 1: uops

Code:

  mul 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)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)a1a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
1004303723061254825100010001000398313030183037303724153289510001000200030373037111001100000073116132627100030383038303830383038
1004303723061254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303723061254825100010001000398313030213037303724153289510001000200030373037111001100000073116112630100030383038303830383038
10043037230103254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303723061254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303723082254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
10043037230107254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303722061254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303723061254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
1004303723061254825100010001000398313030183037303724153289510001000200030373037111001100001073116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  mul 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)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)9fa8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204300372251506129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007102161129634100001003003830038300383003830038
10204300372253606129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722403526129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
10204300372252706129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225606129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225606129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225008229548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722514106129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
10204300372254206129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225606129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)0318191e1f3a3f4e51inst 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)9fa8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100243003722500141026229548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001003644104110102963010000103003830038300383003830038
10024300372250030026229548251001010100001010000504277313300183003730167282873287671001020100002020000300373003711100211091010100001000644101610102963010000103003830038300383003830038
10024300372250024021042954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100064451610102963010000103003830038300383003830038
100243003722500330219029548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000644101610102963010000103003830038300383003830038
1002430037225003602622954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100064481610102963010000103003830038300383003830038
100243003722400690262295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010106445168102963010000103003830038300383003830038
1002430037225006002622954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100064410161052963010000103003830038300383003830038
10024300372250033026229548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000644101610102963010000103003830038300383003830038
10024300372250030026229548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000644101610102963010000103003830038300383003830038
1002430037225004802622954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100064410161082970210000103003830038300383022830038

Test 3: Latency 1->3

Code:

  mul 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)03080b18191e1f3f4e51inst 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)9fa6a8a9accdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020430037225000000612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100000007102161129634100001003003830038300383003830038
1020430037225000060612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
1020430037224000060612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100000007101162129634100001003003830038300383003830038
102043003722501002940612954825101001001000010010000500427731330018300373003728265328745101002081000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
102043003722500000352612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003721102011009910010010000100000007101161129634100001003003830038300383003830038
10204300372250000210612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
1020430037225000012063129548441010012710000100100005584278670300183003730037282652228745101002001000020020328300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
102043008622510100014352954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
102043003722500004290612953025101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
102043003722500000264612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100000307101161129742100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)03191e1f3a3f4e51inst 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
10024300372250000129629548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000104000640216222963010000103003830038300383003830038
100243003722500006129548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038
100243003722500006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038
100243003722500006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300841110021109101010000100000640216222963010000103003830038300383003830038
1002430037224024006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100003640217222963010000103003830038300383003830038
100243003722500006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038
100243003722500006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038
100243003722500006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038
100243003722500006129548251001010100001110000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038
100243003722400006129548441001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  mul v0.8h, v8.8h, v9.8h
  mul v1.8h, v8.8h, v9.8h
  mul v2.8h, v8.8h, v9.8h
  mul v3.8h, v8.8h, v9.8h
  mul v4.8h, v8.8h, v9.8h
  mul v5.8h, v8.8h, v9.8h
  mul v6.8h, v8.8h, v9.8h
  mul 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)03191e3f51inst 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)9fa1cdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200391500334125801001008000010080000500640000120020200392003999733999780100200800002001600002003920039118020110099100100800001000051102161120036800001002004020040200402004020040
8020420039150104125801001008000010080000500640000120020200392003999733999780100200800002001600002003920039118020110099100100800001002051101161120036800001002004020040200402004020040
8020420039150004125801001008000010080000500640000120020200392003999733999780100200800002001600002003920039118020110099100100800001000051101161120036800001002004020040200402004020040
80204200391500124125801001008000010080000500640000120020200392003999733999780100200800002001600002003920039118020110099100100800001000051101161120036800001002004020040200402004020040
8020420039150004125801001008000010080000500640000120020200392003999733999780100200800002001600002003920039118020110099100100800001000051101161120036800001002004020040200402004020040
8020420039150004125801001008000010080000500640000120020200392003999733999780100200800002001600002003920039118020110099100100800001000051101161120036800001002004020040200402004020040
8020420039150004125801001008000010080000500640000120020200392003999733999780100200800002001600002003920039118020110099100100800001000051101161120036800001002004020040200402004020040
802042003915001714125801001008000010080000500640000120020200392003999733999780100200800002001600002003920039118020110099100100800001000051101161120036800001002004020040200402004020040
80204200391500154125801001008000010080000500640000120020200392003999733999780100200800002001600002003920039118020110099100100800001000051101161120036800001002004020040200402004020040
8020420039150004125801001008000010080000500640000120020200392003999733999780100200800002001600002003920039118020110099100100800001000051101161120036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03191e3f51inst 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)9faccfd5d6daddinst fetch restart (de)e0eb? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200481500124025800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100502031601120036080000102004020040200402004020040
8002420039150004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100502011601120036080000102004020040200402004020040
8002420039150004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100502011601120036080000102004020040200402004020040
80024200391500032525800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100502011601120036080000102004020040200402004020040
8002420039150004025800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100502011601120036080000102004020040200402004020040
8002420039150004025800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100502011601120036080000102004020040200402004020040
8002420039150004025800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100502011601120036080000102004020040200402004020040
80024200391500214025800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100502011601120036080000102004020040200402004020040
8002420039150004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100502011601120036080000102004020040200402004020040
8002420039150004025800101080000108010450640000020020200392003999963100198001020800002016000020039200391180021109101080000100502011601120036080000102004020040200402004020040