Apple M1 Microarchitecture Research by Dougall Johnson

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

UQSHL (immediate, scalar, B)

Test 1: uops

Code:

  uqshl b0, b0, #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)a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
100420371606116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100011692037203711100110001073116111786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000073116221786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000373116111786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000373116111786100020382038203820382038
100420371506116862510001000100026452112018203720371571318951000100010002037203711100110000073116221786100020382038203820382038

Test 2: Latency 1->2

Code:

  uqshl b0, b0, #3
  movi v0.16b, 1
  movi v1.16b, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 2.0037

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)9fa8a9accdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020420037150091031968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
102042003715000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
102042003715000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
102042003715000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
102042003715000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
102042003715000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
102042003715000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
102042003715000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
102042003715000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000007101161119791100001002003820038200382008420038
1020420037150001241968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

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)9fa0a1a6a7a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1002420037150000000611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000000006403162219786010000102003820038200382003820038
1002420037150000000611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
1002420037150000000611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
1002420037150000000611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
1002420037150000000611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
100242003715000003061196862510010101001210100005028475210200182003720037184433187671001020100002010000200842003711100211091010100001024200010055076184912719966310000102022920228202762022820228
1002420272152104266044022411963112410073111001215106086528538410201982027520225184672318859106202410672201082720272202266110021109101010000104001127895074744971219955510000102013120180202752027520324
10024202741521155537440611968625100101010000101000050284752102005420037200371844331876710010201000020101692008420037111002110910101000010420010587327042427519894410000102017920180202652018220229
10024202251511103035261196532510010101000010104565028475210200902013020179184553187851001022111802211327204142046691100211091010100001002200217955074671105320000410000102036620274202732041420370
1002420264157019866044042861963118310123181010814107967628576330201982022720466184584518824107722211490221167120417204511011002110910101000010000000606506402162219786010000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  uqshl b0, b8, #3
  uqshl b1, b8, #3
  uqshl b2, b8, #3
  uqshl b3, b8, #3
  uqshl b4, b8, #3
  uqshl b5, b8, #3
  uqshl b6, b8, #3
  uqshl b7, b8, #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)033f51inst 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)9fa8a9acc5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
802042003815129258010810080008100800205006401322001920038200389977069989801202008003220080032200382003811802011009910010080000100000111511821612200350800001002003920039200392003920039
802042003815029258010810080008100800205006401322001920038200389977069989801202028003220080032200382003811802011009910010080000100000111511811612200350800001002003920039200392003920039
802042003815029258010810080008100800205006401322001920038200389977069989801202008003220080032200382003811802011009910010080000100000111511821612200350800001002003920039200392003920039
802042003815029258010810080008100800205006401322001920038200389977769989801202008003220080032200382003811802011009910010080000100000111511811621200350800001002003920039200392003920039
8020420038150292580108100800081008002050064013220019200382003899770699898012020080032200800322003820038118020110099100100800001000001115118216222003523800001002003920039200392003920039
8020420038150124258010810080008100800205006401322001920038200389977069989801202008003220080032200382003811802011009910010080000100000111511811612200350800001002003920039200392003920039
802042003815029258010810080008100800205006401322001920038200389977069989801202008003220080032200382003811802011009910010080000100000111511821622200350800001002003920039200392003920039
802042003815029258010810080008100800205006401322001920038200389977069989801202008003220080032200382003811802011009910010080000100100111511821621200350800001002003920039200392003920039
802042003815029258010810080008100800205006401322001920038200389977069989801202008003220080032200382003811802011009910010080000100000111511821622200350800001002003920039200392003920039
802042003815029258010810080008100800205006401322001920038200389977069989801202008003220080032200382003811802011009910010080000100000111511821612200350800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)0307080a0b18191e1f3a3f51inst 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)9fa0a1a6a8a9acc2cfd0d5d6d9daddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200501500000000001022580010108000010800005064000000200192003820038999631001880010208000020800002003820038118002110910108000010000000050200161600752003580000102003920039200392003920039
800242003815000000000039258001010800001080000506400000020019200382003899963100188001020800002080000200382003811800211091010800001000000005020081600962003580000102003920039200392003920039
800242003815000000000039258001010800001080000506400000020019200382003899963100188001020800002080000200382003811800211091010800001000000005020091600572003580000102003920039200392003920039
800242003815000000000039258001010800001080000506400000020019200382003899963100188001020800002080000200382003811800211091010800001000000005020061600882003580000102003920039200392003920039
800242003815000000000039258001010800001080000506400000020019200382003899963100188001020800002080000200382003811800211091010800001000000005020081600862003580000102003920039200392003920039
800242003815000000000039258001010800001080000506400000120019200382003899963100188001020800002080000200382003811800211091010800001000000005020061600572003580000102003920039200392003920039
800242003815000000000039258001010800001080000506400000020019200382003899963100188001020800002080000200382003811800211091010800001000000005020081600752003580000102003920039200392003920039
8002420038150000000000602580010108000010800005064000000200192003820038999631001880010208000020800002003820038118002110910108000010000000050200101600752003580000102003920039200392003920039
8002420038150000000000602580010108000010800005064000000200192003820038999631001880010208000020800002003820038118002110910108000010000000050200101600952003580000102003920039200392003920039
8002420038150000000000609258001010800001080000506400000020019200382003899963100188001020800002080000200382003811800211091010800001000000005020061600592003580000102003920039200392003920039