Apple M1 Microarchitecture Research by Dougall Johnson

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

SRSHR (vector, 16B)

Test 1: uops

Code:

  srshr v0.16b, v0.16b, #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)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)a0a6accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
1004303723061254725100010001000398160130183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
1004303722061254725100010001000398160030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
1004303722061254725100010001000398160030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
10043037222461254725100010001000398160030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
1004303723061254725100010001000398160030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
1004303722061254725100010001000398160030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
10043037220612547251000100010003981600301830373037241432895100010001000303730371110011000001573116112629100030383038303830383038
1004303723061254725100010001000398160130183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
100430372301032547251000100010003981600301830373037241432895100010001000303730371110011000004273116112629100030383038303830383038
1004303723061254725100010001000398160030183037303724143289510001000100030373037111001100000073116112652100030383038303830383038

Test 2: Latency 1->2

Code:

  srshr v0.16b, v0.16b, #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)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)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
1020430037225000024061295472510100100100001001000050042771600300183003730037282643287451010020010000200100003003730037111020110099100100100001000001024071031611296330100001003012230075300383003830038
10204300372250000006129547251010010010000100100005004277160030018300373003728264328745101002001000020010000300373003711102011009910010010000100000103071011611296330100001003013330178301813003830038
10204300862270076936616453429483158102011401005614110900707428628503027030372303702830134288721119322811156226111493041030368911020110099100100100001002315401746428691101112992129100001003041930422304663046530418
10204304672280197120361658212947519410168144100641431135075642893730301263017930085282643287611010020410000200100003003730037111020110099100100100001000002703071011611296330100001003003830038300383003830038
10204300372250000006129547251010010010000100101505004277160030018300373003728264328745101002001000020010000300373003711102011009910010010000100000103071011611296330100001003003830038300383003830038
1020430037225000000103295472510100100100001001000050042771600300183003730037282643287451010020010000200100003003730037111020110099100100100001000000057071011611296330100001003003830038300383003830038
102043003722500000061295472510100100100001001000050042771600300183003730037282643287451010020010000200100003003730037111020110099100100100001000001000710116112963328100001003003830038300853003830085
10204300372261000006129547251010010010000100100005004277160030018300373003728264328745101002001000020010000300373003711102011009910010010000100000009071011611296330100001003003830038300383003830038
10204300372250000006129547251010010010000100100005004277160030018300373003728264328745101002001000020010000300373003711102011009910010010000100000006071011611296330100001003003830038300383003830038
10204300372240000006129547251010010010000100100005004277160030018300373003728264328745101002001000020010000300373003711102011009910010010000100000006071011611296330100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)03080b18191e1f3a3f4e51inst 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)6061696d6edispatch 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)9fa0a1a6a8a9acc2cfd0d5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024300372250000000612954725100101010000101000050427716010300183003730037282863287671001020100002010000300373003711100211091010100001000000129064002162229629010000103003830038300383003830038
100243003722400000006972954725100101010000101000050427716010300183003730037282863287671001020100002010000300373003711100211091010100001000000120064002162229701010000103003830038300383003830038
10024300372250000000612954725100101010000101000050427716010300183003730037282863287671001020100002010000300373003711100211091010100001000000120064002162229629010000103003830038300383003830038
10024300372250000000612954725100101010000101000050427716010300183003730037282863287671001020100002010000300373003711100211091010100001000000126064002162229629010000103003830038300383007130038
10024300372250000000612954725100101010000101000050427716010300183003730037282863287671001020100002010000300373003711100211091010100001000000114064002162229629010000103003830038300383003830038
10024300372250011000612954725100101010000101000050427716010300183003730037282863287671001020100002010000300373003711100211091010100001000000108064002162229629010000103003830038300383003830038
1002430037225000000061295472510010101000010100005042771601030018300843003728286328767100102010000201000030037300371110021109101010000100000015064002162229629010000103003830038300383003830038
100243003723300000001242954725100101010000101000050427716010300183003730037282863287671001020100002010000300373003711100211091010100001000000102064002162229629010000103003830038300383003830038
1002430037225000000061295472510010101000010100005042771601030018300373003728286328767100102010000201000030037300371110021109101010000100001024064002162229629010000103003830038300383003830038
10024300372250000000612954725100101010000101000050427716010300183003730037282863287671001020100002010171300373003711100211091010100001000000117064002162229629010000103003830038300383003830038

Test 3: throughput

Count: 8

Code:

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

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

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

retire (01)cycle (02)030b191e3f51inst 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)9fa1a6a7a8acc5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200581500003025801081008000810080020500640132020020200392003999776999080120200800322008003220039200391180201100991001008000010000016011151182162120036800001002004020040200402004020040
8020420039150000302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000000011151182161220036800001002004020040200402004020040
8020420039150000302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000004311151182161220036800001002004020040200402004020040
8020420039150000302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000003315611151182161220036800001002004020040200402004020040
8020420039150000302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000005011151182162120036800001002004020040200402004020040
8020420039150006302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000004013211151181162220036800001002004020040200402004020040
8020420039150000302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000004011151182161220036800001002004020040200402004020040
8020420039150000302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000000011151182161220036800001002004020040200402004020040
8020420039150000302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000000011151182161220036800001002004020040200402004020040
8020420039150000302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000000011151182162120036800001002004020040200402004020040

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)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)9fa8a9accfd5d6daddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242005115004025800101080000108000050640000120020200392003999963100198001020800002080000200392003911800211091010800001000350203160432003680000102004020040200402004020040
800242003915004025800101080000108000050640000120020200392003999963100198001020800002080000200392003911800211091010800001020050205160332003680000102004020040200402004020040
8002420039150040258001010800001080000506400001200202003920039999631001980010208000020800002003920039118002110910108000010530050205160552003680000102004020040200402004020040
800242003915004025800101080000108000050640000020020200392003999963100198001020800002080000200392003911800211091010800001000050203160442003680000102004020040200402004020040
800242003915004025800101080000108000050640000020020200392003999963100198001020800002080000200392003911800211091010800001000050204160552003680000102004020040200402004020040
800242003915004025800101080000108000050640000120020200392003999963100198001020800002080000200392003911800211091010800001020350205160442003680000102004020040200402004020040
800242003915004025800101080000108000050640000120020200392003999963100198001020800002080000200392003911800211091010800001000050204160532003680000102004020040200402004020040
8002420039150214025800101080000108000050640000120070200392003999963100198001020800002080000200392003911800211091010800001000050203160332003680000102004020040200402004020040
800242003915004025800101080000108000050640000120020200392003999963100198001020800002080000200392003911800211091010800001000050204160442003680000102004020040200402004020040
800242003915004025800101080000108000050640000120020200392003999963100198001020800002080000200392003911800211091010800001020350204160582003680000102004020040200402004020040