Apple M1 Microarchitecture Research by Dougall Johnson

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

SSUBW (vector, 4S)

Test 1: uops

Code:

  ssubw v0.4s, v0.4s, v1.4h
  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)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)a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
100420371500611687251000100010002646802018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371600611687251000100010002646802018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371506611687251000100010002646802018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371500611687251000100010002646802018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371500611687251000100010002646802018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
1004203715012611687251000100010002646802018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371500751687251000100010002646802018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371500611687251000100010002646802018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371500611687251000100010002646802018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371500611687251000100010002646802018203720371572318951000100020002037203711100110000073116111787100020382038203820382038

Test 2: Latency 1->2

Code:

  ssubw v0.4s, v0.4s, v1.4h
  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)0308090b18191e1f3a3f4e51inst 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)9fa0a1a6a8a9acc2cfd0d5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102042013115000001000611968725101001001000010010000500284896300200542003720085184223187451026120010000200200002008520136111020110099100100100001000000000710011611197910100001002003820038200382003820038
1020420037150000000001261968725101001001000010010000500284768000200182003720037184223187451010020010000200200002003720037111020110099100100100001000000000710011611197910100001002003820038200382003820038
102042003715000000000611968725101001001000010010000500284768010200182003720037184223187451010020010000200200002003720037111020110099100100100001000000000710011611197910100001002003820038200382003820038
102042003715000000000821968725101001001000010010000500284768000200182003720037184223187451010020010000200200002003720037111020110099100100100001000000000710011611197910100001002003820038200382003820038
1020420037150000000001031968725101001001000010010000500284768000200182003720037184223187451010020010000200200002003720037111020110099100100100001000000000710011611197910100001002003820038200382003820038
10204200371500000016200611968725101001001000010010000500284768000200182003720037184223187451010020010000200200002003720037111020110099100100100001000000030710011611197910100001002003820038200382003820038
1020420037150000001200611968725101001001000010010000500284768010200182003720037184223187451010020010000200200002003720037111020110099100100100001000000000710011611197910100001002003820038200382003820038
1020420037150000000001031968725101001001000010010000500284768010200182003720037184223187451010020010000200200002003720037111020110099100100100001000000060710011611197910100001002003820038200382003820038
102042003715000000000611968725101001001000010010000500284768010200182003720037184223187451010020010000200200002003720037111020110099100100100001000000000710011611197910100001002003820038200382003820038
102042003715000000000611968725101001001000010010000500284768000200182003720037184223187451010020010000200200002003720037111020110099100100100001000000000710011611197910100001002003820038200382003820038

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)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)9faccfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100242003715001241968725100101010000101000050284768020018200372003718444318767100102010000202000020037200371110021109101010000100640216221978510000102003820038200382003820038
10024200371500611968725100101010000101000050284768020018200372003718444318767100102010000202000020037200371110021109101010000100640216221978510000102003820038200382003820038
10024200371500611968725100101010000101000050284768020018200372003718444318767100102010000202000020037200371110021109101010000100640216221978510000102003820038200382003820038
100242003715001451968725100101010000101000050284768020018200372003718444318767100102010000202000020037200371110021109101010000100640216221978510000102008620038200382003820038
10024200371500611968725100101010000101000050284768020018200372003718444318767100102010000202000020037200371110021109101010000100640216221978510000102003820038200382003820038
10024200371500611968725100101010000101000050284768020018200372003718444318767100102010000202000020037200371110021109101010000100640216221978510000102003820038200382003820038
10024200371500611968725100101010000101000050284768020018200372003718444318767100102010000202000020037200371110021109101010000100640216221978510000102003820038200382003820038
10024200371500611968725100101010000101000050284768020018200372003718444318767100102010000202000020037200371110021109101010000100640216221978510000102003820038200382003820038
10024200371500611968725100101010000101000050284768020018200372003718444318767100102010000202000020037200371110021109101010000100640216221978510000102003820038200382003820038
10024200371500611968725100101010000101000050284768020018200372003718444318767100102010000202000020037200371110021109101010000100640216221978510000102003820038200382003820038

Test 3: Latency 1->3

Code:

  ssubw v0.4s, v1.4s, v0.4h
  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)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
10204200371504146119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
1020420037150126119687251010010010000100100005002847680120018200372003718422318745101002001049820020000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
1020420081150309419687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
10204200371502736119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
102042003715006119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
10204200371503996119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
10204200371504176119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
102042003715006119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
10204200371501326119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
102042003715006119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100007101161119791100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)0307080b181e1f3f4e51inst 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)9fa0a1a8a9acc5cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024200371500000006119687251001010100001010000502847680020018200372003718444318767100102010000202000020037200371110021109101010000100000006408163319785010000102003820038200382003820038
100242003715000000025119687251001010100001010000502847680020018200372003718444318767100102010000202000020037200371110021109101010000100000006404163319785010000102003820038200382003820038
10024200371500000008219687251001010100001010000502847680120018200372003718444318767100102010000202000020037200371110021109101010000100000006404163319785010000102003820038200382003820038
10024200371500000006119687251001010100001010000502847680020018200372003718444318767100102010000202000020037200371110021109101010000100000006404163319785010000102003820038200382003820038
10024200371500000006119687251001010100001010000502847680020018200372003718444318767100102010000202000020037200371110021109101010000100000006403163319785010000102003820038200382003820038
10024200371500000006119687251001010100001010000502847680020018200372003718444318767100102010000202000020037200371110021109101010000100000006404163319785010000102003820038200382003820038
10024200371500000006119687251001010100001010000502847680020018200372003718444318767100102010000202000020037200371110021109101010000100000006404163319785010000102003820038200382003820038
10024200371500000006119687251001010100001010000502847680020018200372003718444318767100102010000202000020037200371110021109101010000100000006404163319785010000102003820038200382003820038
10024200371500000006119687251001010100001010000502847680020018200372003718444318767100102010000202000020037200371110021109101010000100000006404163319785010000102003820038200382003820038
10024200371500000006119687251001010100001010000502847680020018200372003718444318767100102010000202000020084200371110021109101010000100000006403163319785010000102003820038200382003820038

Test 4: throughput

Count: 8

Code:

  ssubw v0.4s, v8.4s, v9.4h
  ssubw v1.4s, v8.4s, v9.4h
  ssubw v2.4s, v8.4s, v9.4h
  ssubw v3.4s, v8.4s, v9.4h
  ssubw v4.4s, v8.4s, v9.4h
  ssubw v5.4s, v8.4s, v9.4h
  ssubw v6.4s, v8.4s, v9.4h
  ssubw v7.4s, v8.4s, v9.4h
  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)030708090b18191e1f3f51inst 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)9fa0a6a7a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
802042003815000000033006125801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000000000511041623200350800001002003920039200392003920039
8020420038150000000004025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000000000511031623200350800001002003920039200392003920039
8020420038150000000004025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000000000511031633200350800001002003920039200392003920039
802042003815000000000628258010010080000100800005006400001200192003820038997331004980100200800002001600002003820038118020110099100100800001000000000511021633200980800001002003920039200392003920039
802042003815000000041404025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000000000511021633200350800001002003920039200392003920039
802042003815000000030304025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000000000511031632200350800001002003920039200392003920039
80204200381500000002704025801001008000010080000500640000020019200382003899733999680100200800002001600002003820038118020110099100100800001000000000511031633200350800001002003920039200392003920039
802042003815000000030004025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000000000511021633200350800001002003920039200392003920039
80204200381500000003150705258010010080000100800005006400001200192003820038997315999680100200800002001600002003820038118020110099100100800001000000000511031633200350800001002003920039200392003920039
802042003815000000040504025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000000000511031633200350800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03081e3f51inst 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)9fa0a1a6a8acc2cdcfd0d2d5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242004815003513925800101080000108000050640000200192003820038999631001880010208000020160000200382003811800211091010800001000000005020004163320035080000102003920039200392003920039
800242003815003933925800101080000108000050640000200192003820038999631001880010208000020160000200382003811800211091010800001000000005020003163320035080000102003920039200392003920039
8002420038150003925800101080000108000050640000200192003820038999631001880010208000020160000200382003811800211091010800001000000005020003163220035080000102003920039200392003920039
800242003815003543925800101080000108000050640000200192003820038999631001880010208000020160000200382003811800211091010800001000000005020002162320035080000102003920039200392003920039
80024200381500963925800101080000108000050640000200192003820038999631001880010208000020160000200382003811800211091010800001000000005020003163220035080000102003920039200392003920039
8002420038149003925800101080000108000050640000200192003820038999631001880010208000020160000200382003811800211091010800001000000005020005163320035080000102003920039200392003920039
8002420038150003925800101080000128000050640000200192003820038999631001880010208000020160000200382003811800211091010800001022010005072003363320035080000102003920039200392003920039
8002420038150003925800101080000108000050640000200192008720038999631001880010208000020160000200382003811800211091010800001000300005020003163220035080000102003920039200392003920039
8002420038150003925800101080000108000050640000200192003820038999631001880010208000020160000200382003811800211091010800001000000005020003163220035080000102003920039200392003920039
800242003815004053925800101080000108000050640000200192003820038999631001880010208000020160000200382003811800211091010800001000000005020003162320035080000102003920039200392003920039