Apple Microarchitecture Research by Dougall Johnson

M1/A14 P-core (Firestorm): Overview | Base Instructions | SIMD and FP Instructions
M1/A14 E-core (Icestorm):  Overview | Base Instructions | SIMD and FP Instructions

SQSHL (vector, 8H)

Test 1: uops

Code:

  sqshl v0.8h, v0.8h, v1.8h
  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 uop (01)cycle (02)031e3f4e51schedule uop (52)schedule simd uop (54)dispatch simd uop (57)ldst uops in schedulers (5b)696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map simd uop (7e)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst simd alu (9a)l1d tlb miss (a1)l1d cache writeback (a8)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
10042037150821687251000100010002646802018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
10042037150821687251000100010002646802018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371501031687251000100010002646802018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
10042037160611687251000100010002646802018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
10042037150611687251000100010002646802018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
10042037150821687251000100010002646802018203720371572318951000100020002037203711100110000073116111809100020382038203820382038
10042037150611687251000100010002646802018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
1004203715121201687251000100010002646802018203720371572318951000100020002037203711100110000173116111787100020382038203820382038
10042037150611687251000100010002646802018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
10042037150611687251000100010002646802018203720371572318951000100020002037203711100110000073116111787100020382038203820382038

Test 2: Latency 1->2

Code:

  sqshl v0.8h, v0.8h, v1.8h
  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 uop (01)cycle (02)03mmu table walk data (08)l2 tlb miss data (0b)18191e1f3a3f4e51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1020420037150000000061196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
10204200371500000000166196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
1020420037150000000082196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
1020420037150000000061196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
1020420037150000000061196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
1020420037150000000061196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
1020420037150000000061196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
1020420037150000000061196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
1020420037149000000061196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820038
1020420037150000000061196872510100100100001001000050028476801200182003720037184223187451010020010000200200002003720037111020110099100100100001000071011611197910100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire uop (01)cycle (02)031f3a3f4e51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d cache writeback (a8)acbranch cond mispred nonspec (c5)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1002420037150026219687251001010100001010000502847680020018200372003718444318767101272010000202000020037200371110021109101010000100006441016101119785010000102003820038200382003820038
100242003715002621968725100101010000101000050284768002001820037200371844431876710010201000020200002003720037111002110910101000010000644816101019785010000102003820038200382003820038
1002420037150026219687251001010100001010000502847680020018200372003718444318767100102010000202000020037200371110021109101010000100006441116101019785010000102003820038200382003820038
1002420037150026219687251001010100001010000502847680120018200372003718444318767100102010000202000020037200371110021109101010000100006441016101019785010000102003820038200382003820038
10024200371500262196872510010101000010100005028476800200182003720037184443187671001020100002020000200372003711100211091010100001000064410168519785010000102003820038200382003820038
1002420037150026219687251001010100001010000502847680020018200372003718444318767100102010000202000020037200371110021109101010000100006441016101019785010000102003820038200382003820038
100242003715002621968725100101010000101000050284768012001820037200371844431876710010201000020200002003720037111002110910101000010000644101651019785010000102003820038200382003820038
10024200371500262196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000064481651019785010000102003820038200382003820038
1002420037150026219687251001010100001010000502847680120018200372003718444318767100102010000202000020037200371110021109101010000100006441016101019785010000102003820038200382003820038
10024200371500262196872510010101000010100005028476800200182003720037184443187671001020100002020000200372003711100211091010100001000064451651019785010000102003820038200382003820038

Test 3: Latency 1->3

Code:

  sqshl v0.8h, v1.8h, v0.8h
  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 uop (01)cycle (02)031e1f3f4e51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d cache writeback (a8)acbranch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
1020420037150006119687251010010010000100100005002847680020018200372003718429718741101002001000820020016200372003711102011009910010010000100001117170160019802100001002003820038200382003820038
1020420037156006119687251010010010000100100005002847680120018200372003718429618741101002001000820020016200372003711102011009910010010000100001117180160019801100001002003820038200382003820038
102042003715049806119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
1020420037150006119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
10204200371501206119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
10204200371503006119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
1020420037150006119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
10204200371501806119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
102042003715030886119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
10204200371502406119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire uop (01)cycle (02)03mmu table walk instruction (07)mmu table walk data (08)l2 tlb miss instruction (0a)l2 tlb miss data (0b)18191e1f3a3f4e51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696b6d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d tlb access (a0)l1d tlb miss (a1)ld unit uop (a6)l1d cache writeback (a8)a9acc2branch cond mispred nonspec (c5)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
10024200371501010000026819687251001010100001010000502847680020018020037200371844431876710010201000020200002003720037111002110910101000010000000006441316101019785010000102003820038200382003820038
10024200371501010000026819687251001010100001010000502847680020018020037200371844431876710010201000020200002003720037111002110910101000010000000006441016101019785010000102003820038200382003820038
1002420037150101000002891968725100101010000101000050284768002001802003720037184443187671001020100002020000200372003711100211091010100001000000000644416111119785010000102003820038200382003820038
100242003715010100000268196872510010101000010100005028476801200180200372003718444318767100102010000202000020037200371110021109101010000100000000064481661119785010000102003820038200382003820038
1002420037150101000002681968725100101010000101000050284768002001802003720037184443187671001020100002020000200372003711100211091010100001000000000644816101019785010000102003820038200382003820038
10024200371501010000026819687251001010100001010000502847680120018020084200851844431878610164201016322203262008320084111002110910101000010000003006441116101019785010000102003820038200382003820038
10024200371501010000026819687251001010100001010000502847680120018020037200371844431876710010201000020200002003720037111002110910101000010000000006441016101019785010000102003820038200382003820038
1002420037150101000003110196872510010101000010100005028476801200180200372003718444318767100102010000202000020037200371110021109101010000100000000064411168819785010000102003820038200382003820038
10024200371501010000026819687251001010100001010000502847680120018020037200371844431876710010201000020200002003720037111002110910101000010000000006441016101019785010000102003820038200382003820038
10024200371501010000026819687251001010100001010000502847680120018020037200371844431876710010201000020200002003720037111002110910101000010000000006441016101119785010000102003820038200382003820038

Test 4: throughput

Count: 8

Code:

  sqshl v0.8h, v8.8h, v9.8h
  sqshl v1.8h, v8.8h, v9.8h
  sqshl v2.8h, v8.8h, v9.8h
  sqshl v3.8h, v8.8h, v9.8h
  sqshl v4.8h, v8.8h, v9.8h
  sqshl v5.8h, v8.8h, v9.8h
  sqshl v6.8h, v8.8h, v9.8h
  sqshl v7.8h, v8.8h, v9.8h
  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 uop (01)cycle (02)03mmu table walk data (08)l2 tlb miss data (0b)18191e1f3f51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d tlb access (a0)ld unit uop (a6)st unit uop (a7)l1d cache writeback (a8)a9acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
80204200591500002004025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000000000511021611200350800001002003920039200392003920039
80204200381500000004025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000000000511011611200350800001002003920039200392003920039
80204200381500000004025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000000000511011611200350800001002003920039200392003920039
8020420038150000039004025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000000000511011611200350800001002003920039200392003920039
80204200381500000004025801001008000010080000500640000020019200382003899733999680100200800002001600002003820038118020110099100100800001000000000511011611200350800001002003920039200392003920039
80204200381500000004025801001008000010080000500640000020019200382003899733999680100200800002001600002003820038118020110099100100800001000000000511011611200350800001002003920039200392003920039
80204200381500000004025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000000000511011611200350800001002003920039200392003920039
80204200381500000004025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000000000511011611200350800001002003920039200392003920039
80204200381500000004025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000000000511011611200350800001002003920039200392003920039
80204200381500000004025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000000000511011611200350800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03191e3f51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)5f60696d6emap stall dispatch (70)simd prf full (72)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9faccfd5map dispatch bubble (d6)daddfetch restart (de)e0eaeb? simd retires (ee)? int retires (ef)f5f6f7f8fd
80024200481500183925800101080000108000050640000002001920038200389996031001880010208000020160000200382003811800211091010800001005020121601213200352080000102003920039200392003920039
80024200381500039258001010800001080000506400000020019200382003899960310018800102080000201600002003820038118002110910108000010050207160911200350080000102003920039200392003920039
800242003815000392580010108000010800005064000000200192003820038999603100188001020800002016000020038200381180021109101080000100502091601010200350080000102003920039200392003920039
8002420038150036392580010108000010800005064000000200192003820038999603100188001020800002016000020038200381180021109101080000100502091601111200350080000102003920039200392003920039
80024200381500213925800101080000108000050640000112001920038200389996031001880010208000020160000200382003811800211091010800001005020121601310200350080000102003920039200392003920039
80024200381500393925800101080000108000050640000002001920038200389996031001880010208000020160000200382003811800211091010800001005020111601010200350080000102003920039200392003920039
8002420038150003925800101080000108000050640000002001920038200389996031001880010208000020160000200382003811800211091010800001005020101601010200350080000102003920039200392003920039
8002420038150033392580010108000010800005064000000200192003820038999603100188001020800002016000020038200381180021109101080000100502061601111200350080000102003920039200392003920039
8002420038150021392580010108000010800005064000000200192003820038999603100188001020800002016000020038200381180021109101080000100502091601010200350080000102003920039200392003920039
80024200381500633925800101080000108000050640000002001920038200389996031001880010208000020160000200382003811800211091010800001005020111601010200350080000102003920039200392003920039