Apple M1 Microarchitecture Research by Dougall Johnson

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

REV64 (vector, 4S)

Test 1: uops

Code:

  rev64 v0.4s, v0.4s
  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)0308090b18191e1f3a3f4e51inst 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)a0a1a6a8a9acc2cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
100420371500000000611686251000100010002645211201820372037157131895100010001000203720371110011000000000073116111786100020382038203820382038
100420371500000000611686251000100010002645211201820372037157131895100010001000203720371110011000000000073116111786100020382038203820382038
1004203715000000002511686251000100010002645211201820372037157131895100010001000203720371110011000000003073116111786100020382038203820382038
100420371500000000611686251000100010002645210201820372037157131895100010001000203720371110011000000100073116111786100020382038203820382038
100420371500000000611686251000100010002645210201820372037157131895100010001000203720371110011000000000073116111786100020382038203820382038
100420371500000000841686251000100010002645210201820372037157131895100010001000203720371110011000000000073116111786100020382038203820382038
100420371500000000841686251000100010002645211201820372037157131895100010001000203720371110011000000000073116111786100020382038203820382038
100420371500000000611686251000100010002645210201820372037157131895100010001000203720371110011000000000073116111786100020382038203820382038
100420371500000000611686251000100010002645211201820372037157131895100010001000203720371110011000000300073116111786100020382038203820382038
1004203715000001500611686251000100010002645211201820372037157131895100010001000203720371110011000000006073116111786100020382038203820382038

Test 2: Latency 1->2

Code:

  rev64 v0.4s, 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)03080918191e1f3f4e51inst 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)9fa0a8accfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102042003715000000061196862510100100100001001000050028475212001820037200371842131874510100200100002001000020037200371110201100991001001000010000071011611200340100001002003820038200382003820038
102042003715000000061196862510100100100001001000050028475212001820037200371842131874510100200100002001000020037200371110201100991001001000010000071011611197910100001002003820038200382003820038
102042003715000000061196862510100100100001001000050028475212001820037200371842131874510100200100002001000020037200371110201100991001001000010000671011611197910100001002003820038200382003820038
1020420037150000000103196862510100100100001001000050028475212001820037200371842131874510100200100002001000020037200371110201100991001001000010000080411611197910100001002003820038200382003820038
102042003715000000061196862510100100100001001000050028475212001820037200371842131874510100200100002001000020037200371110201100991001001000010020071011611197910100001002003820038200382003820038
102042003715000000061196862510100100100001001000050028475212001820037200371842131874510100200100002001000020037200371110201100991001001000010000071011611197910100001002003820038200382003820038
102042003715000000061196862510100100100001001000050028475212001820037200371842131874510100200100002001000020037200371110201100991001001000010001071011611197910100001002003820038200382003820038
102042003715000000061196862510100100100001001000050028475212001820037201811842131874510100200100002001000020037200371110201100991001001000010000071011611197910100001002003820038200382003820038
102042003715000000061196862510100100100001001000050028475212001820037200371842131874510100200100002001000020037200371110201100991001001000010000071011611197910100001002003820038200382003820038
102042003715000000061196862510100100100001001000050028475212001820037200371842131874510100200100002001000020037200371110201100991001001000010000071011611197910100001002003820038200382003820038

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
1002420037150066196862510010101000010100005028475210200182003720037184433187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
1002420037150061196862510010101000010100005028475210200182003720037184433187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
1002420037150082196862510010101000010100005028475210200182003720037184433187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
1002420037150061196862510010101000010100005028475210200182003720037184433187671001020100002010000200372008311100211091010100001000640216221978610000102003820038200382003820038
1002420037150061196862510010101000010100005028475211200182003720037184433187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
1002420037150061196862510010101000010100005028475210200182003720037184433187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
1002420037150061196862510010101000010100005028475210200182003720037184433187671001020100002010000200372003711100211091010100001010640216221978610000102003820038200382003820038
1002420037150061196862510010101000010100005028475210200182003720037184433187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
1002420037150061196862510010101000010100005028475210200182003720037184433187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038
1002420037150061196862510010101000010100005028475210200182003720037184433187671001020100002010000200372003711100211091010100001000640216221978610000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  rev64 v0.4s, v8.4s
  rev64 v1.4s, v8.4s
  rev64 v2.4s, v8.4s
  rev64 v3.4s, v8.4s
  rev64 v4.4s, v8.4s
  rev64 v5.4s, v8.4s
  rev64 v6.4s, v8.4s
  rev64 v7.4s, v8.4s
  movi v8.16b, 9

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code divided by count): 0.2506

retire (01)cycle (02)03080b1e3f51inst 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)cdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200601500002925801081008000810080020500640132020019200382003899776998980120200800322008003220038200381180201100991001008000010001511151180160020035800001002003920039200392003920039
8020420038150000292580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020035800001002003920039200392003920039
8020420038150000292580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020035800001002003920039200392003920039
80204200381500003142580392100800081008002050064013202013220038200389977699898012020080032200800322009020038118020110099100100800001000011151180160020035800001002003920039200392003920039
8020420038150000292580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020035800001002003920039200392003920039
80204200381500002925801081008000810080020500640132020019200382003899776998980120200800322008003220038200381180201100991001008000010001211151180160020035800001002003920039200392003920039
8020420038150000292580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020035800001002003920039200392003920039
8020420038150000282225801081008000810080020500640132020019200382003899776998980120200800322008003220038200381180201100991001008000010007811151180160020035800001002003920039200392003920039
8020420038150000292580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000611151180160020035800001002003920039200392003920039
8020420038150000292580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151180160020035800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03070818191e1f3a3f51inst 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)9fa0a1a6a8a9acc2cdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8002420039150000000039258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110910108000010000250111005020216222003580000102003920039200392003920039
800242003815000000003925800101080000108000050640000020019200382003899963100188001020800002080000200382003811800211091010800001000029075005020116112003580000102003920039200392003920039
80024200381500000000392580010108000010800005064000012001920038200389996310018800102080000208000020038200381180021109101080000100003200005020116112003580000102003920039200392003920039
800242003815000000002522580010108000010800005064000002001920038200389996310018800102080000208000020038200381180021109101080000100002500005020116112003580000102003920039200392003920039
800242003815000000003925800101080000108000050640000120019200382003899963100188001020800002080000200382003811800211091010800001000019078005020116112003580000102003920039200392003920039
8002420038150000000039258001010800001080000506400001200192019020038999671001880010208000020800002003820038118002110910108000010000203005020116112003580000102003920039200392003920039
8002420038150000000039258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010000480177005020116112003580000102003920039200392003920039
8002420038150000000039258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010000003005020116112003580000102003920039200392003920039
8002420038150000000039258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010000103005020116222003580000102003920039200392003920039
8002420038150000000039258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110910108000010000000005020116112003580000102003920039200392003920039