Apple M1 Microarchitecture Research by Dougall Johnson

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

SMIN (vector, 4S)

Test 1: uops

Code:

  smin v0.4s, v0.4s, v1.4s
  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)a8cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
10042037150611687251000100010002646800201820372037157231895100010002000203720371110011000073116111787100020382038203820382038
100420371501031687251000100010002646800201820372037157231895100010002000203720371110011000073116111787100020382038203820382038
10042037150911687251000100010002646800201820372037157231895100010002000203720371110011000073116111787100020382038203820382038
10042037150821687251000100010002646800201820372037157231895115210002000203720371110011000073116111787100020382038203820382038
10042037150821687251000100010002646800201820372037157231895100010002000203720371110011000073116111787100020382038203820382038
10042037150821687251000100010002646800201820372037157231895100010002000203720371110011000073116111787100020382038203820382038
10042037153821687251000100010002646800201820372037157231895100010002000203720371110011000073116111787100020382038203820382038
10042037160611687251000100010002646800201820372037157231913100010002000203720371110011000073116111787100020382038203820382038
10042037150611687251000100010002646800201820372037157231895100010002000203720371110011000073116111787100020382038203820382038
10042037150611687251000100010002646800201820372037157231895100010002000203720371110011000073116111787100020382038203820382038

Test 2: Latency 1->2

Code:

  smin v0.4s, v0.4s, v1.4s
  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)030b181e3f4e51inst 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)9fa8a9acbranch mispredict (cb)cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020420037150000611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
1020420037150000611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
1020420037150000611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
1020420037150000611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
1020420037150000611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010000007101161119791100001002003820038200382008620038
1020420037150000611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010000007101161119912100001002003820038200382003820038
1020420037150000611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
1020420037150000611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
1020420037150000611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
1020420037150000611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038

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)9fa6a8c5cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024200371503611968725100101010000101000050284768012001820037200371844431876710010201000020200002003720037111002110910101000010000640416441978510000102003820038200382003820038
10024200371500841968725100101010000101000050284768002001820037200371844431876710010201000020200002003720037111002110910101000010000640416341978510000102003820038200382003820038
10024200371500611968725100101010000101000050284768012001820037200371844431876710010201000020200002003720037111002110910101000010000640416441978510000102003820038200382003820038
100242003715012611968725100101010000101000050284768012001820037200371844431876710010201000020200002003720037111002110910101000010000640316431978510000102003820038200382003820038
10024200371500661968725100101010000101000050284768012001820037200371844431876710010201000020200002003720037111002110910101000010000640416341978510000102003820038200382003820038
100242003715004411968725100101010000101000050284768002001820037200371844431876710010201000020200002003720037111002110910101000010000640416431978510000102003820038200382003820038
10024200371500611968725100101010000101000050284768002001820037200371844431876710010201000020200002003720037111002110910101000010000640316441978510000102003820038200382003820038
10024200371500611968725100101010000101000050284768002001820037200371844431876710010201000020200002003720037111002110910101000010000640316441978510000102003820038200382003820038
10024200371500611968725100101010000101000050284768012001820037200371844431876710010201000020200002003720037111002110910101000010000640416341978510000102003820038200382003820038
10024200371500611968725100101010000101000050284768002001820037200371844431876710010201000020200002003720037111002110910101000010000640316441978510000102003820038200382003820038

Test 3: Latency 1->3

Code:

  smin v0.4s, v1.4s, v0.4s
  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)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)9fcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102042003715015611968725101001001000010010000500284768002001802003720037184223187451010020010000200200002003720037111020110099100100100001007101161119791100001002003820038200382003820038
10204200371500611968725101001001000010010000500284768002001802003720037184223187451010020010000200200002003720037111020110099100100100001007101161119791100001002003820038200382003820038
10204200371500611968725101001001000010010000500284768012001802003720037184223187451010020010000200200002003720037111020110099100100100001007101161119791100001002003820038200382003820038
102042003715015611968725101001001000010010000500284768002001802003720037184223187451010020010000200200002003720037111020110099100100100001007101161119791100001002003820038200382003820038
10204200371500611968725101001001000010010000500284768002001802003720037184223187451010020010000200200002003720037111020110099100100100001007101161119791100001002003820038200382003820038
10204200371500611968725101001001000010010000500284768012001802003720037184223187451010020010000200200002003720037111020110099100100100001007101161119791100001002003820038200382003820038
102042003715021611968725101001001000010010000500284768002001802003720037184223187451010020010168200200002003720037111020110099100100100001007101161119791100001002003820038200382003820038
10204200371509611968725101001001000010010000500284768002001802003720037184223187451010020010000200200002003720037111020110099100100100001007101161119791100001002003820038200382003820038
10204200371500611968725101001001000010010000500284768002001802003720037184223187451010020010000200200002003720037111020110099100100100001007101161119791100001002003820038200382003820038
10204200371500611968725101001001000010010000500284768002001802003720037184223187451010020010000200200002003720037111020110099100100100001007101161119791100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)03191e3f4e51inst 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
100242003715000252196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
100242003715000251196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
10024200371500061196872510010101000010100005028476801200182018020037184443187671001020100002020000200372003711100211091010100001000640216221978510000102008620038200382003820038
10024200371500061196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
10024200371500061196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
10024200371500061196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
10024200371500061196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
10024200371500061196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
10024200841500061196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
100242003715000726196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038

Test 4: throughput

Count: 8

Code:

  smin v0.4s, v8.4s, v9.4s
  smin v1.4s, v8.4s, v9.4s
  smin v2.4s, v8.4s, v9.4s
  smin v3.4s, v8.4s, v9.4s
  smin v4.4s, v8.4s, v9.4s
  smin v5.4s, v8.4s, v9.4s
  smin v6.4s, v8.4s, v9.4s
  smin v7.4s, v8.4s, v9.4s
  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)03191e1f3f51inst 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
80204200381500004025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000051104165320035800001002003920039200392003920039
80204200381500004025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000051104164420035800001002003920039200392003920039
80204200381500004025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000051104164420035800001002003920039200392003920039
80204200381500004025801001008000010080000500640000120019200382003899733999680205200800002001600002003820038118020110099100100800001000051104164520035800001002003920039200392003920039
80204200381500004025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000051105164520035800001002003920039200392003920039
80204200381500004025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000051105165420035800001002003920039200392003920039
80204200381500004025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000051103163520035800001002003920039200392003920039
80204200381500004025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000051104164520035800001002003920039200392003920039
80204200381500304025801001008000010080000500640000120019200382003899738999680100200800002001600002003820038118020110099100100800001000051104164520035800001002003920039200392003920039
80204200381500004025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000051104165420035800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03070a181e3f51inst 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)5f6061696d6edispatch 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)9fa7a8a9accfd0d2d5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200481500103039258001010800001080000506400005102001920038200389996310018800102080000201600002003820038118002110910108000010000350200071671020035080000102003920039200392003920039
80024200381500109812580010108000010800005064000051020019200382003899963100188001020800002016000020038200381180021109101080000100100502000101610820035080000102003920039200392003920039
8002420038150010022925800101080000108000050640000510200192003820038999631001880010208000020160000200382003811800211091010800001011435020001016101020035080000102003920039200392003920039
8002420038155010981258001010800001080000506400005152005820038200389996310018800102080000201600002003820038118002110910108000010000050200071671020035080000102003920039200392003920039
800242003815001318392580010108000010800005064000051020019200382003899963100188001020800002016000020038200381180021109101080000100000502000101681020035080000102003920039200392003920039
8002420038150010123925800101080000108000050640000510200192003820038999631001880010208000020160000200382003811800211091010800001000005020001016101020035080000102003920039200392003920039
80024200381500100392580010108000010800005064000041020019200382003899963100188001020800002016000020038200381180021109101080000100000502000101610720035080000102003920039200392003920039
80024200381490100392580103108000010800005064000041520019200382003899963100188001020800002016000020038200381180021109101080000100109502000101671020035080000102003920039200392003920039
80024200381500100392580010108000010800005064000041020019200382003899963100188001020800002016000020038200381180021109101080000100000502000101671020035080000102003920039200392003920039
80024200381500100392580010108000010800005064000041020019200382003899963100188001020800002016000020038200381180021109101080000100000502000101671020035080000102003920039200392003920039