Apple M1 Microarchitecture Research by Dougall Johnson

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

USHL (vector, 2D)

Test 1: uops

Code:

  ushl v0.2d, v0.2d, v1.2d
  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)030b1e3f4e51inst 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
1004203716066116872510001000100026468002018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
1004203715036116872510001000100026468002018203720371572318951000100020002037203711100110001073116111787100020382038203820382038
1004203716006116872510001000100026468002018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
1004203716006116872510001000100026468002018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
1004203715006116872510001000100026468002018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
1004203716006116872510001000100026468002018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
10042037160726116872510001000100026468002018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
1004203716008216872510001000100026468002018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
1004203716096116872510001000100026468012018203720371572318951000100020002037203711100110000373116111787100020382038203820382038
1004203715006116872510001000100026468012018203720371572318951000100020002037203711100110000073116111787100020382038203820382038

Test 2: Latency 1->2

Code:

  ushl v0.2d, v0.2d, v1.2d
  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)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
102042003715506119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
102042003715506119643251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
1020420037155031819687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
102042003715506119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
102042003715606119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
1020420037156061196872510100100100001001000050028476800200182003720037184223187451010020010000200200002003720037111020110099100100100001002607101161119791100001002003820038200382003820038
102042003715606119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100037101161119791100001002003820038200382003820038
102042003715506119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
1020420037155025119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
1020420037155126119687251010010010000100100005002847680020018200852003718422318745101002001000020020000200372003711102011009910010010000100007101161119791100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)0318191e1f3a3f4e51inst 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)9fa8acc2cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024200371500012006119687251001010100001010000502847680020018020037200371844431876710010201000020200002003720037111002110910101000010000640216221978510000102003820038200382003820038
1002420037150000006119687251001010100001010000502847680020018020037200371844431876710010201000020200002003720037111002110910101000010100640216221978510000102003820038200382003820038
1002420037150000006119687251001010100001010000502847680020018020037200371844431876710010201000020200002003720037111002110910101000010030640216221978510000102003820038200382008620038
1002420037150130006119676621002310100001010000552847680020018020037200371844431876710010201000020200002003720037111002110910101000010030640216221978510000102003820038200382003820038
10024200371500000072619687251001010100001010000502847680020018020037200371844431876710010201000020200002003720037111002110910101000010060640216221978510000102003820038200382003820038
100242003715000000286619687251001010100481010000502847680020018020037200371844431876710010201000020200002003720037111002110910101000010130640216221978510000102003820038200382003820038
1002420037150000006119687251001010100001010000502847680020018020037200371844431876710010201000020200002003720037111002110910101000010000640216221978510000102003820038200382003820038
1002420037150000006119687251001010100001010000502847680020018020037200371844431876710010201000020200002003720037111002110910101000010230640216221978510000102003820038200382003820038
10024200371500100010319687251001010100001010000502847680020018020037200371844431876710010201000020200002003720037111002110910101000010000640216221978510000102003820038200382003820038
1002420037150000006119687251001010100001010000502847680020018020037200371844431876710010201000020200002003720037111002110910101000010000640216221978510000102003820038200382003820038

Test 3: Latency 1->3

Code:

  ushl v0.2d, v1.2d, v0.2d
  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)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)9fa0a1a6a7a8a9acc2branch mispredict (cb)cfd0d5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020420037155000000061196872510100100100001001000050028476800020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000000710011611197910100001002003820038200382003820038
1020420037156000000061196872510100100100001001000050028476801520018200372003718422318745101002001000020020000200372003711102011009910010010000100000000000710011611197910100001002003820038200382003820038
1020420037155000000061196872510100100100001001000050028476800020018200372003718422318745101002001000020020000200372003711102011009910010010000100000020300710011611197910100001002003820038200382003820038
1020420037156000000061196872510100100100001001000050028476800020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000000710011611197910100001002003820038200382003820038
1020420037155000000061196872510100100100001001000050028476800020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000000710011611197910100001002003820038200382003820038
10204200371550000000726196872510100100100001001000050028476800020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000001710011611197910100001002003820232200382003820038
10204200371550000210061196873610100100100001001000050028476800020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000000710011611197910100001002003820038200382003820038
1020420037155000000061196872510100100100001001000050028476800020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000000710011611197910100001002003820038200382003820038
1020420037155000000061196872510100100100001001000050028476800020018200372003718422318745101002001000020020000200372003711102011009910010010000100000000000735011611197910100001002003820038200382003820038
102042003715500000006119687251010010010000100100005002847680002001820037200371842231874510100200100002002000020037200371110201100991001001000010000000013800710011611197910100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)03181e3f4e51inst 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)91inst b.cc (94)inst integer (97)inst neon or fp (9a)9fa8accdcfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100242003715600611968725100101010000101000050284768002001802003720037184443187671001020100002020000200372003711100211090101010000100006402162219785010000102003820038200382003820038
100242003715500611968725100101010000101000050284768002001802003720037184443187671001020100002020000200372003711100211090101010000100006402162219785010000102003820038200382003820038
100242003715500611968725100101010000101000050284768002001802003720037184443187671001020100002020000200372003721100211090101010000100006402162219785010000102003820038200382003820038
100242003715500611968725100101010000101000050284768002001832003720037184443187671001020100002020000200372003711100211090101010000100016402162219785010000102003820038200382003820038
1002420037155030611968725100101010000101000050284768002001802003720037184443187671001020100002020000200372003711100211090101010000100006402162219785010000102003820038200382003820038
1002420037156095261968725100101010000101000050284768002001802003720037184443187671001020100002020000200372003711100211090101010000100006402162219785010000102003820038200382003820038
1002420037155006119687251001010100001010000502847680020018020037200371844431876710010201000020200002003720037111002110901010100001001506402162219785010000102003820038200382003820038
100242003715600611968725100101010000101000050284768002001802003720037184443187671001020100002020000200862003711100211090101010000100006402162219785010000102003820038200382003820038
100242003715500611968725100101010000101000050284768002001802003720037184443187671001020100002020000200372003711100211090101010000100006402162219785010000102003820038200382003820038
100242003715500611968725100101010000101000050284768002001802003720037184443187671001020100002020000200372003711100211090101010000100006402162219785010000102003820038200382003820038

Test 4: throughput

Count: 8

Code:

  ushl v0.2d, v8.2d, v9.2d
  ushl v1.2d, v8.2d, v9.2d
  ushl v2.2d, v8.2d, v9.2d
  ushl v3.2d, v8.2d, v9.2d
  ushl v4.2d, v8.2d, v9.2d
  ushl v5.2d, v8.2d, v9.2d
  ushl v6.2d, v8.2d, v9.2d
  ushl v7.2d, v8.2d, v9.2d
  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)031e1f3f51inst 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)9fa1a8a9accfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8020420038156004025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001002300511031611200350800001002003920039200392003920039
8020420038156008225801001008000010080000500640000020019200382003899733999680100200800002001600002003820038118020110099100100800001000000511011611200350800001002003920039200392003920039
8020420038156004025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000000511011611200350800001002003920039200392003920039
80204200381551206825801001008000010080000500640000020019200382003899733999680100200800002001600002003820038118020110099100100800001000100511011611200350800001002003920039200392003920039
8020420038155004025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000000511011611200350800001002003920039200392003920039
8020420038155004025801001008000010080000500640000020019200382003899733999680100200800002001600002003820038118020110099100100800001000000511011611200350800001002003920039200392003920039
80204200381560042025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000100511011611200350800001002003920039200392003920039
80204200381561204025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000000511011611200350800001002003920039200392003920039
8020420038155004025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000000511011611200350800001002003920039200392003920039
8020420038155004025801001008000010080000500640000020019200382003899733999680100200800002001600002003820038118020110099100100800001000000511011611200350800001002003920039200392003920039

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)9fa8accfd2d5d6d9dbddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8002420048156153925800101080000108000050640000120019200382003899963100188001020800002016000020038200381180021109101080000100050200916008182003580000102003920039200392003920039
80024200381550172925800101080000108000050640000120019200382003899963100188001020800002016000020038200381180021109101080000100050200916007172003580000102003920039200392003920039
80024200381550392580010108000010800005064000002001920038200389996310018800102080000201600002003820038118002110910108000010005020017160017172003580000102003920039200392003920039
8002420038155039258001010800001080000506400000200192003820038999631001880010208000020160000200382003811800211091010800001000502001716008172003580000102003920039200392003920039
80024200381550392580010108000010800005064000002001920038200389996310018800102080000201602642003820038118002110910108000010005020014160017172003580000102003920039200392003920039
80024200381550602580010108000010800005064000012001920038200389996310018800102080000201600002003820038118002110910108000010005020014160018172003580000102003920039200392003920039
800242003815503925800101080000108000050640000020019200382003899963100188001020800002016000020038200381180021109101080000100050200816001782003580000102003920039200392003920039
80024200381551239258001010800001080000506400000200192003820038999631001880010208000020160000200382003811800211091010800001000502001716008172003580000102003920039200392003920039
80024200381550392580010108000010800005064000012001920038200389996310018800102080000201600002003820038118002110910108000010005020017160018172008580000102003920039200392003920039
8002420038155039258001010800001080000506400001200192003820038999631001880010208000020160000200382003811800211091010800001000502001716001762003580000102003920039200392003920039