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, vector, 4H)

Test 1: uops

Code:

  uqshl v0.4h, v0.4h, #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)03181e3f4e51inst 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
10042037150276116862510001000100026452112018203720371571318951000100010002037203711100110000073216221786100020382038203820382038
1004203715006116862510001000100026452112018203720371571318951000100010002037203711100110000073216221786100020382038203820382038
1004203715006116862510001000100026452112018203720371571318951000100010002037203711100110000073216221787100020382038203820382038
1004203715006116862510001000100026452112018203720371571318951000100010002037203711100110000073216221786100020382038203820382038
1004203715096116862510001000100026452112018203720371571318951000100010002037203711100110000073216221786100020382038203820382038
1004203715006116862510001000100026452112018203720371571318951000100010002037203711100110000073216221786100020382038203820382038
1004203715006116862510001000100026452112018203720371571318951000100010002037203711100110000073216221786100020382038203820382038
1004203715006116862510001000100026452112018203720371571318951000100010002037203711100110000073216221786100020382038203820382038
1004203715006116862510001000100026452112018203720371571318951000100010002037203711100110000073216221816100020382038203820382038
1004203715006116862510001000100026452112018203720371571318951000100010002037203711100110000073216221786100020382038203820382038

Test 2: Latency 1->2

Code:

  uqshl v0.4h, v0.4h, #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)030b18191e1f3f4e51inst 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)9fa0a1a6a8a9acc2c5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204200371500000020819686251010010010000100100005002847521120018200372003718428718741101002001000820010008200372003711102011009910010010000100000000011171701600198010100001002003820038200382003820038
1020420037150000306119686251010010010000100100005002847521120018200372003718428718741101002001000820010008200372003711102011009910010010000100000000011171801600198000100001002003820038200382003820038
1020420037150000006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000000000071011611197910100001002003820038200382003820038
10204200371500006606119686251010010010000100100005002848785120018200372003718421318745101002001000020010000200372003711102011009910010010000100000000000071011611197910100001002003820038200382003820038
10204200371500007506119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000003000071011611197910100001002003820038200382003820038
102042003715000000611968625101001001000010010000500284752112001820037200371842131874510100200100002001000020037200371110201100991001001000010000000108000071011611197910100001002003820038200382003820038
10204200371500000061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000000087000071011611197910100001002003820038200382003820038
10204200371500000061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000000090000071011611197910100001002003820038200382003820038
1020420037150000306119686251010010010000100100005802848785120018200372003718421318745101002001000020010000200372003711102011009910010010000100000000000071011611197910100001002003820038200382003820038
1020420037150000006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000000000071011611197910100001002003820038200382003820038

1000 unrolls and 10 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
10024200371500251196862510010101000010100005028475210200182003720037184433187671001020100002010180200372003711100211091010100001000640316221978610000102003820038200382003820038
1002420037150061196862510010101000010100005028475211200182003720037184433187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
1002420037150061196862510010101000010100005028475211200182003720037184433187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
10024200371500611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010015640216221978610000102003820038200382003820038
1002420037150061196862510010101000010100005028475211200182003720037184433187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
1002420037150061196862510010101000010100005028475211200182003720037184433187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
1002420037150061196862510010101000010100005028475211200182003720037184433187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
1002420037150061196862510010101000010100005028475211200182003720037184433187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
1002420037150061196862510010101000010100005028475211200182003720037184433187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
1002420037150061196862510010101000010100005028475211200182003720037184433187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  uqshl v0.4h, v8.4h, #3
  uqshl v1.4h, v8.4h, #3
  uqshl v2.4h, v8.4h, #3
  uqshl v3.4h, v8.4h, #3
  uqshl v4.4h, v8.4h, #3
  uqshl v5.4h, v8.4h, #3
  uqshl v6.4h, v8.4h, #3
  uqshl v7.4h, v8.4h, #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)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)9fa8acc5branch mispredict (cb)cdcfd6inst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8020420059151050425801081008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010000111511816020035800001002003920039200392003920039
802042003815002925801081008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010000111511816020035800001002003920039200392003920039
80204200381500292580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001000132111511816020035800001002003920039200392003920039
8020420038150029258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100553111511816020035800001002003920039200392003920039
80204200381500292580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001001115111511816020035800001002003920039200392003920039
802042003815002925801081008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010000111511816020035800001002003920039200392003920039
8020420038150029258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100300111511816020035800001002003920039200392003920039
802042003815002925801081008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010000111511816020035800001002003920039200392003920039
8020420038150029258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100045111511816020035800001002003920039200392003920039
802042003815002925801081008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010000111511816020035800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)030408090b18191e1f3a3f51inst 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)cdcfd0d5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8002420050150000000000392580010108000010800005064000015200192003820038999631001880010208000020800002003820038118002110910108000010000006000050205516552003580000102003920039200392003920039
800242003815000000000039258001010800001080000506400001020019200382003899963100188001020800002080000200382003811800211091010800001000000300050205816752003580000102003920039200392003920039
800242003815000000000039258001010800001080000506400001520019200382003899963100188001020800002080000200382003811800211091010800001000000000050205716582003580000102003920039200392003920039
800242003815000000000039258001010800001080000506400001520019200382003899963100188001020800002080000200382003811800211091010800001000000600150205716662003580000102003920039200392003920039
800242003815000000000039258001010800001080000506400001520019200382003899963100188001020800002080000200382003811800211091010800001000000000050205716752003580000102003920039200392003920039
800242003815000000000039258001010800001080000506400001520019200382003899963100188001020800002080000200382003811800211091010800001000000000050205616672003580000102003920039200392003920039
8002420038150000000450039258001010800001080000506400001520019200382003899963100188001020800002080000200382003811800211091010800001000000300050205516742003580000102003920039200392003920039
800242003815000000018004192580010108000010800005064000015200192003820038999631001880010208000020800002003820038118002110910108000010000007500050205816652003580000102003920039200392003920039
800242003815000000000039258001010800001080000506400001020019200382003899963100188001020800002080000200382003811800211091010800001000000000050205816562003580000102003920039200392003920039
800242003815000000000039258001010800001080000506400001520019200382003899963100188001020800002080000200382003811800211091010800001000050900050205616662003580000102003920039200392003920039