Apple M1 Microarchitecture Research by Dougall Johnson

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

URSHR (vector, 4S)

Test 1: uops

Code:

  urshr v0.4s, v0.4s, #3
  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)a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
10043037220612547251000100010003981603018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
10043037230612547251000100011503981603018303730372414328951000100010003037303711100110001073116112629100030383038303830383038
10043037230612547251000100010003981603018303730372414328951000100010003037303711100110007073116112629100030383038303830383038
10043037220612547251000100010003981603018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
10043037220612547251000100010003981603018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
10043037230612547251000100010003981603018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
1004303722048225382510001000100039816030183037303724143289510001000100030373037111001100004873116112629100030383038303830383038
100430372302182547251000100010003981603018303730372414328951000100010003037303711100110007073116112629100030383038303830383038
10043037220612547251000100010003981603018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372303672547251000100010003981603018303730372414328951000100010003037303711100110000073116112629100030383038303830383038

Test 2: Latency 1->2

Code:

  urshr v0.4s, v0.4s, #3
  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)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)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)91inst b.cc (94)inst integer (97)inst neon or fp (9a)9fa8a9accdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020430037225006129547251010010010000100100005004277160300183003730037282643287451010020010000200100003003730037111020110099300211001001000010000007101161129633100001003003830038300383003830038
102043003722500612954725101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009901001001000010000007101161129633100001003003830038300383003830038
102043003722500612954725101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009901001001000010000007101161129633100001003003830038300383003830038
1020430037225009362954725101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009901001001000010000007101161129633100001003003830038300383003830038
102043003722500612954725101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009901001001000010000007101161129633100001003003830038300383003830038
102043003722500612954725101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009901001001000010000007101161129633100001003003830038300383003830038
102043003722400612954725101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009901001001000010000007101161129633100001003003830038300383003830038
102043003722500612954725101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009901001001000010000007101161029633100001003003830038300383003830038
102043003722500612954725101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009901001001000010000007101161129633100001003003830038300383003830038
102043003722500612954725101001001000010010000500427716030018300373003728264328745101002001000020010000300373003711102011009901001001000010000007101161129633100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)030708090a0b18191e1f3a3f4e51inst 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)9fa0a6a8acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024300372240000000000612954725100101010000101000050427716013001830037300372828632876710010201000020100003003730037111002110910101000010000006403162229629010000103003830038300843003830038
10024300372240000000000612954725100101010000101000050427716013001830037300372828632876710010201000020100003003730037111002110910101000010000006402162229629010000103003830038300383003830038
10024300372250000000000612954725100101010000101000050427716013001830037300372828632876710010201000020100003003730037111002110910101000010000006402162229629010000103003830038300383003830038
10024300372250000000000612954725100101010000101000050427716013001830037300372828632876710010201000020100003003730037111002110910101000010000006402162229629010000103003830038300383003830038
10024300372250000000000612954725100101010000101000050427716013001830037300372828632876710010201000020100003003730037111002110910101000010000006402162229629010000103003830038300383003830038
10024300372250000000000612954725100101010000101000050427716013001830037300372828632876710010201000020100003003730037111002110910101000010000006402162229629010000103003830038300383003830038
10024300372250000000000612954725100101010000101000050427716013001830037300372828632876710010201000020100003003730037111002110910101000010000006402162229629010000103008530038300383003830038
10024300372264100088118870405798294576310077171006415111068742825681303063046330402283143728936110662211305221032930412304159110021109101010000102012260008183895329962610000103046430415304613046730415
10024304142260100000000823294758010089191006413112008842889391301623046330415283143928918112152211306221146730417304674110021109101010000102212253308293455729952510000103046530462304143046130464
1002430463226000108826770415872294661711008115100241811200664287976130270303713032228316112891011117241115222113063027230370611002110910101000010000006402162229989410000103032330038304643022630215

Test 3: throughput

Count: 8

Code:

  urshr v0.4s, v8.4s, #3
  urshr v1.4s, v8.4s, #3
  urshr v2.4s, v8.4s, #3
  urshr v3.4s, v8.4s, #3
  urshr v4.4s, v8.4s, #3
  urshr v5.4s, v8.4s, #3
  urshr v6.4s, v8.4s, #3
  urshr v7.4s, v8.4s, #3
  movi v8.16b, 9

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code divided by count): 0.2506

retire (01)cycle (02)03081e1f3f51inst 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)9fa1a8a9acc5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200591500360302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000000111511801602200360800001002004020040200402004020040
802042003914903510302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000300111511801600200360800001002004020040200402004020040
8020420039150000302580108100800081008002050064013212002020039200399977699908012020080032200800322003920039118020110099100100800001000000111511801600200360800001002004020040200402004020040
80204200391500210302580108100800081008002050064013212002020039200399977699908012020080032200800322003920039118020110099100100800001000000111511801600200360800001002004020040200402004020040
802042003915003570302580108100800081008002050064013212002020039200399977699908012020080032200800322008920039118020110099100100800001000000111511801600200360800001002004020040200402004020040
8020420039150000302580108100800081008002050064013212002020039200399977699908012020080032200800322003920039118020110099100100800001000000111511801600200760800001002004020040200402004020040
8020420039150000302580108100800081008002050064013212002020039200399977699908012020080032200800322003920039118020110099100100800001000000111511801600200360800001002004020040200402004020040
802042003915013060302580108100800081008002050064013212002020039200399977699908022820080032200800322003920039118020110099100100800001000003111515101600200361800001002004020040200402004020040
802042003915004080512580108100800081008002050064013212002020039200399977699908012020080032200800322003920039118020110099100100800001000000111511801600200360800001002004020040200402004020040
802042003915002820302580108100800081008002050064013212002020039200399977699908012020080032200800322003920039118020110099100100800001000000111511801600200360800001002004020040200402004020040

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)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)9fa6a8accfd5d6ddinst fetch restart (de)e0eb? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200511500402580010108000010800005064000001200202003920039999631001980010208000020800002003920039118002110910108000010002150206166620036080000102004020040200402004020040
8002420039150040258001010800001080000506400000020020200392003999963100198001020800002080000200392003911800211091010800001000050202162220036080000102004020040200402004020040
8002420039150040258001010800001080000506400000120020200392003999963100198001020800002080000200392003911800211091010800001000050202162220036080000102004020040200402004020040
8002420039150040258001010800001080000506400000020020200392003999963100198001020800002080000200392003911800211091010800001000050202162620036080000102004020040200402004020040
8002420039150040258001010800001080105506400000120020200392003999963100198001020800002080000200392003911800211091010800001000050206162220036080000102004020040200402004020040
8002420039150040258001010800001080000506400000020020200392003999963100198001020800002080000200392003911800211091010800001000650203163620036080000102004020040200402004020040
8002420039150040258001010800001080000506400000020020200392003999963100198001020800002080000200392003911800211091010800001000050203166620036080000102004020040200402004020040
8002420039150040258001010800001080000506400000020020200392003999963100198001020800002080000200392003911800211091010800001000050202162620036080000102004020040200402004020040
8002420039150040258001010800001080000506400000020020200392003999963100198001020800002080000200392003911800211091010800001000050202166220036080000102004020040200402004020040
8002420039150040258001010800001080000506400000020020200392003999963100198001020800002080000200392003911800211091010800001000050202162620036080000102004020040200402004020040