Apple M1 Microarchitecture Research by Dougall Johnson

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

SQNEG (vector, 2S)

Test 1: uops

Code:

  sqneg v0.2s, v0.2s
  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)a0a8cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
100430372306125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372206125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372306125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372306125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372306125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372306125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372306125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
1004303723010525472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372206125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372306125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038

Test 2: Latency 1->2

Code:

  sqneg v0.2s, v0.2s
  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)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
102043003722506129547251010010010000100100005004277160130018300373003728264328745101002001000020010000300373003711102011009910010010000100007101161129633100001003003830038300383003830038
102043003722506129547251010010010000100100005004277160130018300373003728264328745101002001000020010000300373003711102011009910010010000100007101161129633100001003003830085300383003830038
102043003722406129547251010010010000100100005004277160030018300373003728264328745101002001000020010000300373003711102011009910010010000100007101161129633100001003003830038300383003830038
102043003722506129547251010010010000100100005004277160030018300373003728264328745101002001000020010000300373003711102011009910010010000100007101161129633100001003003830038300383003830038
102043003722506129547251010010010000100100005004277160130018300373003728264328745101002001000020010000300373003711102011009910010010000100007101161129633100001003003830038300383003830038
102043003722406129547251010010010000100100005004277160130018300373003728264328745101002001000020010000300373003711102011009910010010000100007101161129633100001003003830038300383003830038
102043003722506129547251010010010000100100005004277160030018300853003728264328745101002001000020010000300373003711102011009910010010000100007101160129633100001003003830038300383003830038
102043003722506129547251010010010000100100005004277160030018300373003728264328745101002001000020010000300373003711102011009910010010000100007101161129633100001003003830038300383003830038
102043003722506129547251010010010000100100005004277160130018300373003728264328745101002001000020010000300373003711102011009910010010000100007101161129633100001003003830038300383003830038
102043003722506129547251010010010000100100005004277160030018300373003728264328745101002001000020010000300373003711102011009910010010000100007101161129633100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)03080918191e1f3f4e51inst 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)9fa0a1a6a8a9acc2c5cficache miss (d3)d5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100243003722500000061295472510010101000010100005042771600300180300373003728286328767100102010000201000030037300371110021109101010000100000000064002162229629010000103003830038300383003830038
1002430037225000000441295472510010101000010100005042771600300180300373003728286328767100102010000201000030037300371110021109101010000100000000064002162229629010000103003830038300383003830038
100243003722500000061295472510010101000010100005042771600300180300373003728286328767100102010000201000030037300371110021109101010000100000000064002162229629010000103003830038300383003830038
100243003722500000061295472510010101000010100005042771600300180300373003728286328767100102010000201000030037300371110021109101010000100000000064002162229629010000103003830038300383003830038
100243003722500000061295472510010101000010100005042771600300180300373003728286328767100102010000201000030037300371110021109101010000100000000064002162229629010000103003830038300383003830038
100243003722500000061295472510010101000010100005042771600300180300373003728286328767100102010000201000030037300371110021109101010000100000000064002162229629010000103003830038300383003830038
100243003722500000061295472510010101000010100005042771600300180300373003728286328767100102010000201000030037300371110021109101010000100000000064002162229629010000103003830038300383003830038
100243003722500000061295472510010101000010100005042771600300180300373003728286328767100102010000201000030037300371110021109101010000100000000064002162229629010000103003830038300383003830038
100243003722500000061295472510010101000010100005042771600300180300373003728286328767100102010000201000030037300371110021109101010000100000000064002162229629010000103003830038300383003830038
100243003722500000061295472510010101000010100005042771600300180300373003728286328767100102010000201000030037300371110021109101010000100000000064002162229629010000103003830038300383003830038

Test 3: throughput

Count: 8

Code:

  sqneg v0.2s, v8.2s
  sqneg v1.2s, v8.2s
  sqneg v2.2s, v8.2s
  sqneg v3.2s, v8.2s
  sqneg v4.2s, v8.2s
  sqneg v5.2s, v8.2s
  sqneg v6.2s, v8.2s
  sqneg v7.2s, v8.2s
  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)030b1e1f3f51inst 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)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)9fa8acc2c5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200391500003025801081008000810080020500640132200202003920039997706999080120200800322008003220039200391180201100991001008000010000011151181160020036800001002004020040200402004020201
80204200391520013230258010810080008100800205006401322007020039200399977069990802282008003220080032200392003911802011009910010080000100001111151180160020036800001002004020040200402004020040
802042003915006030258010810080008100800205006401322002020039200399977069990801202008003220080032200392003911802011009910010080000100078011151180160020036800001002004020040200402004020040
80204200391500003025801081008000810080020500640132200202003920039997776999080120200800322008003220039200391180201100991001008000010000011151180160020036800001002004020040200402004020040
80204200391500003025801081008000810080020500640132200202003920039997706999080120200800322008003220039200391180201100991001008000010000011151180160020036800001002004020040200402004020040
80204200391500003025801081008000810080020500640132200202003920039997706999080120200800322008003220039200391180201100991001008000010000011151180160020036800001002004020040200402004020040
80204200391500003025801081008000810080020500640132200202003920039997706999080120200800322008003220039200391180201100991001008000010000011151180160020036800001002004020040200402004020040
802042003915000069525801081008000810080020500640132200202003920039997706999080120200800322008003220039200391180201100991001008000010026011151180160020036800001002004020040200402004020040
80204200391500003025801081008000810080020500640132200202003920039997706999080120200800322008003220039200391180201100991001008000010010011151180160020036800001002004020040200402004020040
80204200391500003025801081008000810080020500640132200202003920039997706999080120200800322008003220039200391180201100991001008000010010011151180160020036800001002004020040200402004020040

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)9fa8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8002420051150040258001010800001080000506400001200202003920039999631001980010208000020800002003920039118002110910108000010005020716782003680000102004020040200402004020040
8002420039150040258001010800001080000506400001200202003920039999631001980010208000020800002003920039118002110910108000010005020616672003680000102004020040200402004020040
8002420039150040258001010800001080000506400000200202003920039999631001980010208000020800002003920039118002110910108000010035020616882003680000102004020040200402004020040
800242003915026440258001010800001080000506400000200202003920039999631001980010208000020800002003920039118002110910108000010005020716552003680000102004020040200402004020040
800242003915038440258001010800001080000506400001200202003920039999631001980010208000020800002003920039118002110910108000010005020816782003680000102004020040200402004020040
8002420039150040258001010800001080000506400000200202003920039999631001980010208000020800002003920039118002110910108000010005020716562003680000102004020040200402004020040
8002420039150040258001010800001080000506400000200202003920039999631001980010208000020800002003920039118002110910108000010005020716882003680000102004020040200402004020040
8002420039150040258001010800001080000506400000200202003920039999631001980010208000020800002003920039118002110910108000010005020716662003680000102004020040200402004020040
8002420039150040258001010800001080000506400000200202003920039999631001980010208000020800002003920039118002110910108000010005020816672003680000102004020040200402004020040
800242003915035440258001010800001080000506400000200202003920039999631001980010208000020800002003920039118002110910108000010005020716662003680000102004020040200402004020040