Apple M1 Microarchitecture Research by Dougall Johnson

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

PMUL (16B)

Test 1: uops

Code:

  pmul v0.16b, v0.16b, v1.16b
  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)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)a6a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
100430372306125482510001000100039831330183037303724153289510001000200030373037111001100000073316222630100030383038303830383038
100430372206125482510001000100039831330183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
100430372306125482510001000100039831330183037303724153289510001000200030373037111001100000673216222630100030383038303830383038
100430372308425482510001000100039831330183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
100430372306125482510001000100039831330183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
100430372206125482510001000100039831330183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
100430372206125482510001000100039831330183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
1004303723028725482510001000100039831330183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
100430372206125482510001000100039831330183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
100430372206125482510001000100039831330183037303724153289510001000200030373037111001100000373216222630100030383038303830383038

Test 2: Latency 1->2

Code:

  pmul v0.16b, v0.16b, v1.16b
  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)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)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)9fa0a6a8a9accfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020430037225100006129548251010010010000100100005004277313300183003730037282653287451010020010000200200003003730037111020110099100100100001000000371011611296340100001003003830038300383013230038
1020430037225000006129548251010010010000100100005004277313300183003730037282653287451010020010000200200003003730037111020110099100100100001000020071011611296340100001003003830038300383003830038
1020430037224000006129548251010010010000100100005004277313300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
1020430037225000006129548251013210010000100100005004277313300183003730037282653287631010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
1020430037225000009429548251010010010000100100005004277313300183003730037282653287451010020010000200200003003730037111020110099100100100001000020071011611296340100001003003830038300383003830038
1020430037225000006129548251010010810000100100005004277313300183003730037282653287451010020010000200200003003730037111020110099100100100001000010071011611296340100001003003830038300383003830038
1020430037225000006129548251010010010000100100005004277313300183003730037282653287451010020010000200200003003730037111020110099100100100001000010071011611296340100001003003830038300383003830038
1020430037224000006129548251010010010000100100005004277313300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
1020430037224000006129548251010013510000100100005004277313300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773133001830037300372826516287451010020010000200200003003730037111020110099100100100001000020071011611296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)03191e3f4e51inst 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)9fa8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100243003722500612954825100101010000101000050427731313001803003730037282873287671001020100002020000300373003711100211091010100001000640316332963010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001803003730037282873287671001020100002020000300373003711100211091010100001010640316332963010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001803003730037282873287671001020100002020000300373003711100211091010100001000640316332963010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001803003730037282873287671001020100002020000300373003711100211091010100001000640316332963010000103003830038300383003830038
100243003722500612954825100101010000121000050427731313001803003730037282873287671001020100002020000300373003711100211091010100001030640316332963010000103003830038300383003830038
100243003722400612954825100101010000101000050427731313001803003730037282873287671001020100002020000300373003711100211091010100001000640316332963010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001803003730037282873287671001020100002020000300373003711100211091010100001000640316332963010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001803003730037282873287671001020100002020000300373003711100211091010100001000640316332963010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001803003730037282873287671001020100002020000300373003711100211091010100001000640316332963010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001803003730037282873287671001020100002020000300373003711100211091010100001000640316332963010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  pmul v0.16b, v1.16b, v0.16b
  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)9fa1a8accdcfd5d6ddinst fetch restart (de)e0eb? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204300372250612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038
102043003722508212954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100000171011611296340100001003003830038300383003830038
10204300372250612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038
10204300372250612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038
10204300372250612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038
10204300372250612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038
10204300372250612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038
10204300372250612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038
10204300372250612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038
10204300372250612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)0307181e3f4e51inst 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? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1002430037225003661295482510010101000010100006042773133001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
100243003722400061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
100243003722400061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010006402162229693010000103003830038300383003830038
100243003722500061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
100243003722500061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
100243003722500061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
100243003722500061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730084111002110910101000010006402162229630010000103003830038300383003830038
100243003722500061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
100243003722500061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
100243003722500061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  pmul v0.16b, v8.16b, v9.16b
  pmul v1.16b, v8.16b, v9.16b
  pmul v2.16b, v8.16b, v9.16b
  pmul v3.16b, v8.16b, v9.16b
  pmul v4.16b, v8.16b, v9.16b
  pmul v5.16b, v8.16b, v9.16b
  pmul v6.16b, v8.16b, v9.16b
  pmul v7.16b, v8.16b, v9.16b
  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)9fa1a6a8a9accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8020420058150004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000051102161120036800001002004020040200402004020040
802042003915004414125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000051101161120036800001002004020040200402004020040
8020420039150094125801001008000010080000500640000120020200392003999733999780100200800002001600002003920039118020110099100100800001000000051101161120036800001002004020040200402004020040
802042003915003334125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000051101161120036800001002004020040200402004020040
8020420039150004125801001008000010080000500640000020020200392003999733999780100200801032001602142003920039118020110099100100800001000000051101161120036800001002004020040200402004020040
8020420039150094125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000051101161120036800001002004020040200402004020040
8020420039150004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000051101161120036800001002004020040200402004020040
8020420039150004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000051101161120036800001002004020040200402004020040
8020420039150004125801001008000010080000500640000120020200392003999733999780100200800002001600002003920039118020110099100100800001000000051101161120036800001002004020040200402004020040
802042003915005974125801001008000010080000500640000120020200392003999733999780100200800002001600002003920039118020110099100100800001000000051101161120036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)0318191e3f51inst 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)9fa8a9accfd5d6ddinst fetch restart (de)e0ea? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8002420048150002140258001010800001080000506400001020020200392003999963100198001020800002016000020039200391180021109101080000104051850202161120036080000102004020040200402004020040
800242003915000339402580010108000010800005064000000200202003920039999631001980010208000020160000200392003911800211091010800001000050201161120036080000102004020040200402004020040
8002420039150000862580010108000010800005064000001200202003920039999631001980010208000020160000200392003911800211091010800001000050201161120036080000102004020040200402004020040
800242003915000252402580010108000010800005064000001200202003920039999631001980010208000020160000200392003911800211091010800001000050201161120036080000102004020040200402004020040
800242003915000264402580010108000010800005064000001200202003920039999631001980010208000020160000200392003911800211091010800001000050201161120036080000102004020040200402004020040
80024200391500024402580010108000010800005064000000200202003920039999631001980010208000020160000200392003911800211091010800001000050201161120036080000102004020040200402004020040
80024200391500004025800101080000108000050640000012002020039200399996310019800102080000201600002003920039118002110910108000010000502011611200366080000102004020040200402004020040
8002420039150000402580010108000010800005064000001200202003920039999631001980010208000020160000200392003911800211091010800001000050201161120036080000102004020040200402004020040
8002420039150000402580010108000010800005064000001200202003920039999631001980010208000020160000200392003911800211091010800001000050201161120036080000102004020040200402004020040
8002420039150000402580010108000010800005064000001200202003920039999631001980010208000020160000200392003911800211091010800001000050201161120036080000102004020040200402004020040