Apple M1 Microarchitecture Research by Dougall Johnson

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

UHSUB (vector, 2S)

Test 1: uops

Code:

  uhsub v0.2s, v0.2s, v1.2s
  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)696d6edispatch 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
1004203715061168725100010001000264680201820372037157231895100010002000203720371110011000073116111787100020382038203820382038
1004203716061168725100010001000264680201820372037157231895100010002000203720371110011000073116111787100020382038203820382038
1004203715061168725100010001000264680201820372037157231895100010002000203720371110011000073116111787100020382038203820382038
1004203716061168725100010001000264680201820372037157231895100010002000203720371110011000073116111787100020382038203820382038
1004203715961168725100010001000264680201820372037157231895100010002000203720371110011000073116111787100020382038203820382038
10042037150156168725100010001000264680201820372037157231895100010002000203720371110011000073116111787100020382038203820382038
10042037150251168725100010001000264680201820372037157231895100010002000203720371110011000073116111787100020382038203820382038
10042037150156168725100010001000264680201820372037157231895100010002000203720371110011000073116111787100020382038203820382038
1004203715061168725100010001000264680201820372037157231895100010002000203720371110011000073116111787100020382038203820382038
10042037151261168725100010001000264680201820372037157231895100010002000203720371110011000073116111787100020382038203820382038

Test 2: Latency 1->2

Code:

  uhsub v0.2s, v0.2s, v1.2s
  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)03081e3f4e51inst 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)9faccfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204200371500126119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100071011611197910100001002003820038200382003820038
1020420037150066119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100071011611197912100001002003820038200382003820038
1020420037150006119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100071021611197910100001002003820038200382003820038
1020420037150006119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100071011611197910100001002003820038200382003820038
1020420037150006119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100071011611197910100001002003820038200382003820038
1020420037150006119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100071011611197910100001002003820038200382003820038
1020420037150006119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100071011611197910100001002003820038200382003820038
1020420037150006119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100071011611197910100001002003820087200382003820038
1020420037150006119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100071011611197910100001002003820038200382003820038
1020420037150006619687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100071011611197910100001002003820038200382003820038

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)72scheduler 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)9fa8a9accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100242003715036119687251001010100001010000502847680020018200372003718444031876710010201000020200002003720037111002110910101000010000640216221978510000102003820038200382003820038
100242003715036119687251001010100121010000502847680020018200372003718444031876710010201000020200002003720037111002110910101000010000640216221978510000102003820038200382003820038
100242003715006119687251001010100001010000502847680020018200372003718444031876710010201000020200002003720037111002110910101000010000640216221978510000102003820038200382003820038
100242003715006119687251001010100001010000502847680020018201332008418444031876710010201000020200002003720037111002110910101000010000640216221978510000102003820038200382003820085
1002420037150053619687251001010100001010000502847680020018200372003718444031876710010201000020200002003720037111002110910101000010000640216221978510000102003820038200382003820038
100242003715006119687251001010100001010000502847680020018200372003718444031876710010201000020200002003720037111002110910101000010000640216221978510000102003820038200382003820038
100242003715006119687251001010100001010000502847680020018200372003718444031876710010201000020200002003720037111002110910101000010000640216221978510000102003820038200382003820038
100242003715036119687251001010100001010000502847680020018200372003718444031876710010201000020200002003720037111002110910101000010000640216221978510000102003820038200382003820038
1002420037150096419687251001010100001010000502847680020018200372003718444031876710010201000020200002003720037111002110910101000010000640216221978510000102003820038200382003820038
1002420037156025119687251001010100001010000502847680120018200372003718444031876710010201000020200002003720037111002110910101000010000640216221978510000102003820038200382003820038

Test 3: Latency 1->3

Code:

  uhsub v0.2s, v1.2s, v0.2s
  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)030b1e3f4e51inst 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)9fa8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102042003715000611968725101001001000010010000500284768020018200372003718422318745101002001000020020000200372003711102011009910010010000100137101161119791100001002003820038200382003820038
102042003714900611968725101001001000010010000500284768020018200372003718422318745101002001000020020000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
102042003715000611968725101001001000010010000500284768020018200372003718422318745101002001000020020000200372003711102011009910010010000100137101161119791100001002003820038200382003820038
1020420037150006119687251010010010000100100005002847680200182003720037184223187451010020010000200200002003720037111020110099100100100001004637101161119791100001002003820038200382003820038
1020420037150006119687251010010010000100104566422847680200182003720037184223187451010020010000200200002003720037111020110099100100100001000187101162119791100001002003820038200382003820038
102042003715000611968725101001001000010010000500284768020018200372003718422318745101002001000020020000200372003711102011009910010010000100137101161119791100001002003820038200382003820038
102042003715000611968725101001001000010010000500284768020018200372003718422318745101002001000020020000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
102042003715000611968725101001001000010010000500284768020018200372003718422318745101002001000020020000200372003711102011009910010010000100037101161119791100001002003820038200382003820038
102042003715000611968725101001001000010010000500284768020018200372003718422318745101002001000020020000200372003711102011009910010010000100037101161119791100001002003820038200382003820038
102042003715000611968725101001001000010010000500284768020090200372003718422318745101002001000020020000200372003711102011009910010010000100097101161119791100001002003820038200382003820038

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)696b6d6edispatch stall (70)72scheduler 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)9fa0a1a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1002420037150061196872510060101000010100005028476802001802003720037184440318767100102010000202000020037200371110021109101010000104410640216221978510000102003820038200382003820038
1002420037150061196872510010101000010100005028476802001802003720037184440318767100102010000202000020037200371110021109101010000100000640216221978510000102003820038200382003820038
1002420037150061196872510010101000010100005028476802001802003720037184440318767100102010000202000020037200371110021109101010000100000640216221978510000102003820038200382003820038
1002420037150061196872510010101000010100005028476802001802003720037184440318767100102010000202000020037200371110021109101010000100000640216221978510000102003820038200382003820038
1002420037150061196872510010101000010100005028476802001802003720037184440318767100102010000202000020037200371110021109101010000100000640216221978510000102003820038200382003820038
1002420037150061196872510010101000010100005028476802001802003720037184440318767100102010000202000020037200371110021109101010000100010640216221978510000102003820038200382003820038
1002420037149061196872510010101000010100005028476802001802003720037184440318767100102010000202000020037200371110021109101010000100000640216221978510000102003820038200382003820038
10024200371500611968725100101010000101000050284768020018320037200371844403187671001020100002020000200372003711100211091010100001000543640216221978510000102003820038200382003820038
1002420037150061196872510010101000010100005028476802001802003720037184440318767100102010000202000020037200371110021109101010000100000640216221978510000102003820038200382003820038
1002420037150061196872510010101000010100005028476802001802003720037184440318767100102010000202000020037200371110021109101010000100000640216221978510000102003820038200382003820038

Test 4: throughput

Count: 8

Code:

  uhsub v0.2s, v8.2s, v9.2s
  uhsub v1.2s, v8.2s, v9.2s
  uhsub v2.2s, v8.2s, v9.2s
  uhsub v3.2s, v8.2s, v9.2s
  uhsub v4.2s, v8.2s, v9.2s
  uhsub v5.2s, v8.2s, v9.2s
  uhsub v6.2s, v8.2s, v9.2s
  uhsub v7.2s, v8.2s, v9.2s
  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)030408191e3f51inst 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)72scheduler 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)9fa0a8acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8020420057150100040258010010080000100800005006400001200192003820038997303999680100200800002001600002003820038118020110099100100800001000000511031632200350800001002003920039200392003920039
8020420038150000040258010012480000100800005006400000200192003820038997303999680100200800002001600002003820038118020110099100100800001000100511021622200350800001002003920039200392003920039
8020420038150000040258010010080000100800005006400001200192003820038997373999680100200800002001600002003820038118020110099100100800001000200511021622200350800001002003920039200392003920039
8020420038150000040258010010080000100800005006400001200192003820038997303999680100200800002001600002003820038118020110099100100800001000000511021622200350800001002003920039200392003920039
8020420038150000040258010010080000100800005006400001200192003820038997303999680100200800002001600002003820038118020110099100100800001000300511021622200350800001002003920039200392003920039
8020420038150000040258010010080000100800005006400001200192003820038997303999680100200800002001600002003820038118020110099100100800001000060511021622200350800001002003920088200392003920039
8020420038150000040258010010080000100800005006400000200192003820038997303999680100200800002001600002003820038118020110099100100800001000200511021622200350800001002003920039200392003920039
8020420038150000040258010010080000100800005006400000200192003820038997303999680100200800002001600002003820038118020110099100100800001000000511021622200350800001002003920039200392003920039
8020420038150000040258010010080000100800005006400001200192003820038997303999680100200800002001600002003820038118020110099100100800001000100511021622200350800001002003920039200392003920039
8020420038150000040258010010080000100800005006400001200192003820038997303999680100200800002001600002003820038218020110099100100800001000000511021622200350800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)030b191e3f51inst 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)9fa0a6a8acc2cfd5d6ddinst fetch restart (de)e0ec? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200481500103925800101080000108000050640000020019200382003899963100188001020800002016000020038200381180021109101080000100000050201161120035080000102003920039200392003920039
80024200381500003925800101080000108000050640000020019200382003899963100188001020800002016000020038200381180021109101080000100000050201161120035080000102003920039200392003920039
80024200381500003925802001080000108000050640000020019200382003899963100188001020800002016000020038200381180021109101080000100050050201161120035080000102003920039200392003920039
80024200381500006092580010108000010800005064000002001920038200389996310018800102080000201600002003820038118002110910108000010003854050201161120035080000102003920039200392003920039
80024200381500003925800101080000108000050640000020019200382003899963100188001020800002016000020038200381180021109101080000100000050201161120035080000102003920039200392003920039
80024200381500003925800101080000108000050640000020019200382003899963100188001020800002016000020038200381180021109101080000100040050201161120035080000102003920039200392003920039
800242003815000039258001010800001080000506400000200192003820038999631001880010208000020160000200382003811800211091010800001000443050201161120035080000102003920039200392003920039
80024200381500003925800101080000108000050640000020019200382003899967100188001020800002016000020038200381180021109101080000100053050201161120035080000102003920039200392003920039
80024200381500003925800101080000108000050640000020019200382003899963100188001020800002016000020038200381180021109101080000100010050201161120035080000102003920039200392003920039
80024200381500003925800101080000108000050640000020019200382003899963100188001020800002016000020038200381180021109101080000100000050201161120035080000102003920039200392003920039