Apple M1 Microarchitecture Research by Dougall Johnson

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

UQSHL (scalar, B)

Test 1: uops

Code:

  uqshl b0, b0, b1
  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)a8acc2cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
100420371506116872510001000100026468020182037203715723189510001000200020372037111001100000094116111787100020382038203820382038
100420371566116872510001000100026468020182037203715723189510001000200020372037111001100000073116111787100020382038203820382038
1004203715010316872510001000100026468020182037203715723189510001000200020372037111001100000073116111787100020382038203820382038
100420371506116872510001000100026468020182037203715723189510001000200020372037111001100003073116111787100020382038203820382038
100420371506116872510001000100026468020182037203715723189510001000200020372037111001100000073116111787100020382038203820382038
100420371606116872510001000100026468020182037203715723189510001000200020372037111001100000073116111787100020382038203820382038
100420371506116872510001000100026468020182037203715723189510001000200020372037111001100003073116111787100020382038203820382038
100420371506116872510001000100026468020182037203715723189510001000200020372037111001100000073116111787100020382038203820382038
100420371506116872510001000100026468020182037203715723189510001000200020372037111001100000073116111787100020382038203820382038
100420371606116872510001000100026468020182037203715723189510001000200020372037111001100003073116111787100020382038203820382038

Test 2: Latency 1->2

Code:

  uqshl b0, b0, b1
  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)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)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)9fa8acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020420037150061196872510100100100001001000050028476802001820037200371842231874510100200100002002000020037200371110201100991001001000010000071011612197910100001002003820038200382003820038
10204200371500145196872510100100100001001000050028476802001820037200371842231874510100200100002002000020037200371110201100991001001000010000071011611197910100001002003820038200382003820038
1020420037150061196872510100100100001001000050028476802001820037200371842231874510100200100002002000020037200371110201100991001001000010013071011611197910100001002003820038200382003820038
1020420037150061196872510100100100001001000050028476802001820037200371842231874510100200100002002000020037200371110201100991001001000010000071011611197910100001002003820038200382003820038
10204200371500128196872510100100100001001000050028476802001820037200371842231874510100200100002002000020037200371110201100991001001000010000071011611197910100001002003820038200382003820038
1020420037150061196872510100100100001001000050028476802001820037200371842231874510100200100002002000020037200371110201100991001001000010000071011611197910100001002003820038200382003820038
1020420037150061196872510100100100001001000050028476802001820037200371842231874510100200100002002000020037200371110201100991001001000010000071011611197910100001002003820038200382003820038
10204200371502182196872510100100100001001000050028476802001820037200371842231874510100200100002002000020037200371110201100991001001000010000071011611197910100001002003820038200382003820038
1020420037150061196872510100100100001001000050028476802001820037200371842231874510100200100002002000020037200371110201100991001001000010000071011611197910100001002003820038200382003820038
1020420037150061196872510100100100001001000050028476802001820037200371842231874510100200100002002000020037200371110201100991001001000010000071011611197910100001002003820038200382003820038

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
10024200371500000003401968725100101010000101000050284768002001820037200371844431876710010201000020200002003720037111002110910101000010000000006403162219785010000102003820038200382003820038
1002420037150000000711968725100101010000101000050284768002001820037200371844431876710010201000020200002003720037111002110910101000010000000006402162219785010000102003820038200382003820038
1002420037150000000611968725100101010000101000050284768002001820037200371844431876710010201000020200002003720037111002110910101000010000000006402162219785010000102003820038200382003820038
10024200371500000001451968725100101010000101000050284768002001820037200371844431876710010201000020200002003720037111002110910101000010000000306402162219785010000102003820038200382003820038
1002420037150000000611968725100101010000101000050284768002001820037200371844431876710010201000020200002003720037111002110910101000010000000006402162219785010000102003820038200382003820038
1002420037150000000611968725100101010000101000050284768012001820037200371844431876710010201000020200002003720037111002110910101000010000000006402162219785010000102003820038200382003820038
1002420037150000000611968725100101010000101000050284768002001820037200371844431876710010201000020200002003720037111002110910101000010000000006402162219785010000102003820038200382003820038
10024200371500000001111968725100101010000101000050284768002001820037200371844431876710010201000020200002003720037111002110910101000010000000006402162219785010000102003820038200382003820038
10024200371500000001721968725100101010000101000050284768002001820037200371844431876710010201000020200002003720037111002110910101000010000010006402162219785010000102003820038200382003820038
1002420037150001118009661966543100231110024111030455284896302009020084200861844891880310163221016920206742008520085211002110910101000010024004224026833323219824110000102008620086200852008620085

Test 3: Latency 1->3

Code:

  uqshl b0, b1, b0
  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)0308090b18191e1f3a3f4e51inst 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)9fa0a1a6a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204200371500000000023719687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
1020420037150000000006119687251010010010000100100005002847680020018200372003718422318765101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200852003820038
1020420037150000000006119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371500000000024319687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000100071011611197910100001002003820038200382003820038
10204200371500000000028119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
1020420037150000000006119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000200071011611197910100001002003820038200382003820038
1020420037150000000006119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
1020420037150000000006119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
10204200371500000000053619687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
1020420037150000000006119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

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)9fa0a1a6a8a9acc2branch mispredict (cb)cfd0d5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024200371500000000145196872510010101000010100005028476801220018200372003718444318767100102010000202000020037200371110021109101010000100000000064003163319785010000102003820038200382003820038
1002420037150000000082196872510010101000010100005028476800220018200372003718444318767100102010000202000020037200371110021109101010000100000000064003163419785010000102003820038200382003820038
10024200371500000000145196872510010101000010100005028476801220018200372003718444318767100102010180202000020037200371110021109101010000100000000064003163419785010000102003820038200382003820038
1002420037150000000061196872510010101000010100005028476800020018200372003718444318767100102010000202000020037200371110021109101010000100000000064023163419785010000102003820038200382003820038
10024200371500000000124196872510010101000010100005028476800020018200372003718444318767100102010000202000020037200371110021109101010000100000000064003163319785010000102003820038200382003820038
10024200371500000000726196872510010101000010100005028476800220018200372003718444318767100102010000202000020037200371110021109101010000100000000064023163419785010000102003820038200382003820038
1002420037150000000061196872510010101000010100005028476801020018200372003718444318767100102010000202000020037200371110021109101010000100000000064023163419785010000102003820038200382003820038
1002420037150000000061196872510010101000010100005028476801020018200372003718444318767100102010000202000020037200371110021109101010000100000000064003163319785010000102003820038200382003820038
1002420037150000000061196872510010101000010100005028476800020018200372003718444318767100102010000202000020037200371110021109101010000100000000064003163319785010000102003820038200382003820038
1002420037150000000061196872510010101000010100005028476800020018200372003718444318767100102010000202000020037200371110021109101010000100000000064003163319785010000102003820038200382003820038

Test 4: throughput

Count: 8

Code:

  uqshl b0, b8, b9
  uqshl b1, b8, b9
  uqshl b2, b8, b9
  uqshl b3, b8, b9
  uqshl b4, b8, b9
  uqshl b5, b8, b9
  uqshl b6, b8, b9
  uqshl b7, b8, b9
  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)03080b18191e1f3f51inst 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)9fa0a1a8acc2c5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
802042005815000000050258010810080008100800205006401320200192003820038997769989801202008003220016006420038200381180201100991001008000010000100111511801600200350800001002003920039200392003920039
802042003815000000071258010810080008100800205006401320200192003820038997769989801202008003220016006420038200381180201100991001008000010000002111511801600200350800001002003920039200392003920039
802042003815000001202452580108100800081008002050064013212001920038200389977610070801202008032720016006420038200381180201100991001008000010000000111511801600200770800001002003920039200392003920039
8020420038150000000291028010810080008100800205006401321200192003820038997769989801202008003220016006420038200381180201100991001008000010000100111511801600200350800001002003920039200392003920039
8020420038150000012029258010810080008100800205006401320200192003820038997769989801202008003220016006420038200381180201100991001008000010000000000511011621200350800001002003920039200392003920039
80204200381500000120402580100100800001008000050064000012001920038200389973310077801002008000020016000020038200381180201100991001008000010000000000511011611200350800001002003920039200392003920039
802042003815000000040258010010080000100800005006400000200612003820038997339996801002008000020016000020038200381180201100991001008000010000000000511011611200350800001002009920039200392003920039
802042003815000000040258010010080000100800005006400001200192003820038997339996801002008000020016000020038200381180201100991001008000010000000000511011611200350800001002003920039200392003920039
8020420038150000012040258010010080000100800005006400001200192003820038997339996801002008000020016000020038200381180201100991001008000010000000000511011611200350800001002003920039200392003920039
8020420038149000039040258010010080000100800005006400000200192003820038997339996801002008000020016000020038200381180201100991001008000010000000000511011611200350800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)030b1e3f51inst 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)9fcfd5d6d9ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200471500039258001010800001080000506400002001920038200389996310018800102080000201600002003820038118002110910108000010502041612222003580000102003920039200392003920039
80024200381500039258001010800001080000506400002001920038200389996310018800102080000201600002003820038118002110910108000010502011610112003580000102003920039200392003920039
80024200381500039258001010800001080000506400002001920038200389996310018800102080000201600002003820038118002110910108000010502011610122003580000102003920039200392003920039
80024200381500039258001010800001080000506400002001920038200389996310018800102080000201600002003820038118002110910108000010502011610222003580000102003920039200392003920039
80024200381500014825800101080000108000050640000200192003820038999631001880010208000020160000200382003811800211091010800001050201168212003580000102003920039200392003920039
80024200381500039258001010800001080000506400002001920038200389996310018800102080000201600002003820038118002110910108000010502011610212003580000102003920039200392003920039
80024200381500039258001010800001080000506400002001920038200389996310018800102080000201600002003820038118002110910108000010502011610112003580000102003920039200392003920039
8002420038150003925800101080000108000050640000200192003820038999631001880010208000020160000200382003811800211091010800001050201168212003580000102003920039200392003920039
80024200381500041925800101080000108000050640000200192003820038999631001880010208000020160000200382003811800211091010800001050201168112003580000102003920039200392003920039
8002420038150003925800101080000108000050640000200192003820038999631001880010208000020160000200382003811800211091010800001050201168222003580000102003920039200392003920039