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, 4H)

Test 1: uops

Code:

  mul v0.4h, v0.4h, v1.4h
  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)0308181e1f3f4e51inst 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
100430372400006125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372300006125482510001000100039831313018303730372415328951000100020003037303711100110000673116112630100030383038303830383038
100430372200006125482510001000100039831313018303730372415328951000100020003037303711100110001073116112630100030383038303830383038
100430372300006125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303723009012825482510001000114939831313018303730372415328951000100020003037303711100110000073140112630100030383038303830383038
100430372300006125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303722001206125482510001000100039831313018303730372415328951000100020003037303711100110001073116112630100030383038303830383038
100430372201906125482510081000100039831313018303730372415328951000100020003037303711100110001073116112646100030383038303830383038
100430372200006125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372200006125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  mul v0.4h, v0.4h, v1.4h
  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)030a191e1f3f4e51inst 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
1020430037225000014729548251010010010000100100005004277313130018300373003728265328733101002001000020020000300373003711102011009910010010000100007102162229634100001003003830038300383003830038
102043003722500008229548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007102162229634100001003003830038300383003830038
1020430037224010021029548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007102162229634100001003003830038300383003830038
1020430037225000019329548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007102162229634100001003003830038300383003830038
1020430037224000014729548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007102162229634100001003003830038300383003830038
102043003722500006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300843003711102011009910010010000100007102162229634100001003003830038300383003830038
1020430037225000012429548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007102162229634100001003003830038300383003830038
102043003722500006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007102162229634100001003003830038300383003830038
1020430037225000012429548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007102162229634100001003003830038300383008330038
1020430037225000012429548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007102162229634100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)03081e3f4e51inst 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
1002430037224004282954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
10024300372250011622954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
100243003722500612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
1002430037225001662954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
1002430037225006412954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000640217222963010000103003830038300383003830038
100243003722500612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
1002430037225001662954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
1002430037224001242954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
100243003722500822954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
1002430037225001662954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  mul v0.4h, v1.4h, v0.4h
  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)030818191e1f3f4e51inst 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)9fa0a6a7a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102043003722500000145329548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071011611296340100001003003830038300383003830038
1020430037225000006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071011611296340100001003003830038300383003830038
1020430037224000006129548251010010010000100100005004277313030018300373003728265828745101002001000020020330300373003711102011009910010010000100000000071012511296340100001003003830038300383003830038
10204300372250007925284032294851651018713710056137110436144286812030270303583038128289312886911182228111602222202430371303728110201100991001001000010020112196684858295132988636100001003037030425303733037230370
10204303702270779276165320294761661020114510056135110437034286905030270303683037028291382886711333218110142262233430405303758110201100991001001000010003012195700710116112963410100001003042030372303703037230323
102043003722510000450329485178101921431005613611043714428677503027030410303742829336288911133822711158230226563046630502101102011009910010010000100000020071011611296340100001003003830038300383003830038
1020430037225000006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071011611296340100001003003830038300383003830038
1020430037225000006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071011611296340100001003003830038300383003830038
1020430037225000006129548451010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071011611296340100001003003830038300383003830038
1020430037225000006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071011611296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)030b1e3f4e51inst 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)9fa1a6a8a9c5cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1002430037225091872954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000006402162229630010000103003830038300383003830038
100243003722400612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000006402162229630010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000006402162229630010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000006402162329630010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000006402162329630010000103003830038300383003830038
100243003722500662954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000006402162229630010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000006402162229630010000103003830038300383003830038
10024300372250561822953025100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000006402162329630010000103003830038300383003830038
100243003722400612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000006402162229630010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000006402162229630010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  mul v0.4h, v8.4h, v9.4h
  mul v1.4h, v8.4h, v9.4h
  mul v2.4h, v8.4h, v9.4h
  mul v3.4h, v8.4h, v9.4h
  mul v4.4h, v8.4h, v9.4h
  mul v5.4h, v8.4h, v9.4h
  mul v6.4h, v8.4h, v9.4h
  mul v7.4h, v8.4h, v9.4h
  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)030818191e1f3f51inst 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)9fa0a6a9acc2c5cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200601500000041258010010080000100800005006400002002020039200399973399978010020080000200160000200392003911802011009910010080000100000000511031611200360800001002004020040200402004020040
80204200391500000041258010010080000100800005006400002002020039200399973399978010020080000200160000200392003911802011009910010080000100000000511011611200360800001002004020040200402004020040
80204200391500000041258010010080000100800005006400002002020039200399973399978010020080000200160000200392003911802011009910010080000100000000511011611200360800001002004020040200402004020040
80204200391500000041258010010080000100800005006400002002020039200399973399978010020080000200160000200392003911802011009910010080000100000000511011611200360800001002004020040200402004020040
80204200391500000041258010010080000100800005006400002002020039200399973399978010020080000200160000200392003911802011009910010080000100000000511011611200360800001002004020040200402004020040
802042003915000012041258010010080000100800005006400002002020039200399973399978010020080000200160000200392003941802011009910010080000100000000511011611200360800001002004020040200402004020040
802042003915000000412580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000005110116112003612800001002004020040200402004020040
802042003915000000125258010010080000100800005006400002002020039200399973399978010020080000200160000200392003911802011009910010080000100000000511011611200360800001002004020040200402004020040
802042003915000000104258010010080000100800005006400002002020039200399973399978010020080000200160000200392003911802011009910010080000100000000511011611200360800001002004020040200402004020040
80204200391500000041258010010080000100800005006400002002020039200399973399978010020080000200160000200392003911802011009910010080000100000300511011611200360800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)030718191e1f3f51inst 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)72scheduler 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)9fa0a8a9accfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8002420040150000604025800101080000108000050640000120020200392003999960310019800102080000201600002003920039118002110910108000010000050207167520036080000102004020040200402004020040
800242003915000000402580010108000010800005064000002002020039200399996031001980010208000020160000200392003911800211091010800001000058050207167520036080000102004020040200402004020040
800242003915010096040258001010800001080000506400001200202003920039999603100198001020800002016000020039200391180021109101080000100000502051671120036080000102004020040200402004020040
80024200391500000014725800101080000108000050640000020020200392003999960310019800102080000201600002003920039118002110910108000010000050207167520036080000102004020040200402004020040
8002420039150000004025800101080000108000050640000020020200392003999960310019800102080000201600002003920039118002110910108000010000050205167520036080000102004020040200402004020040
80024200391500001804025800101080000108000050640000020020200392003999960310019800122080000201600002003920039118002110910108000010000050205165720036080000102004020040200402004020040
8002420039150000004025800101080000108000050640000020020200392003999960310019800102080000201600002003920039118002110910108000010000050205167520036080000102004020040200402004020040
8002420039150000004025800101080000128000060640000020020200392003999960310019800122080000201600002003920039118002110910108000010000050207165720036080000102004020040200402004020040
8002420039150000004025800101080000108000050640000020020200392003999960310019800102080000201600002003920039118002110910108000010000050205167720036080000102004020040200402004020040
8002420039150000004025800101080000108000050640000120020200392003999960310019800102080000201600002003920039118002110910108000010000050207167620036080000102004020040200402004020040