Apple M1 Microarchitecture Research by Dougall Johnson

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

XAR

Test 1: uops

Code:

  xar v0.2d, v0.2d, v1.2d, #3
  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)a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
100420371606116872510001000100026468012018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
1004203715061168725100010001000264680120182037203715723189510001000200020372037111001100015073116111787100020382038203820382038
100420371606116872510001000100026468012018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371606116872510001000100026468012018203720371572318791000100020002037203711100110000073116111787100020382038203820382038
100420371606116872510001000100026468012018203720371572318951000100020002037203711100110000073216211787100020382038203820382038
100420371506116872510001000100026468012018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371606116872510001000100026468012018203720371572318951000100020002037203711100110000073116111787100020382038203820382038
100420371606116872510001000100026468012018203720371572318951000100020002037203711100110003073116111787100020382038203820382038
100420371606116872510001000100026468012018203720371572318951000100020002037203711100110000373116111787100020382038203820382038
100420371607516872510001000100026468012018203720371572318951000100020002037203711100110000073116111787100020382038203820382038

Test 2: Latency 1->2

Code:

  xar v0.2d, v0.2d, v1.2d, #3
  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)03080b18191e1f3a3f4e51inst 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)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)9fa0a1a6a7a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204200371550000000191196872510100100100001001000050028476802001802003720037184223187451010020010000200200002003720037111020110099100100100001000000000071021622197910100001002003820038200382003820038
1020420037155000000061196872510100100100001001000050028476802001832003720037184223187451010020010000200200002003720037111020110099100100100001000000000071021622197910100001002003820038200382003820038
1020420037155000000061196872510100100100001001000050028476802001802003720037184223187451010020010000200200002003720037111020110099100100100001000000000071021622197910100001002003820038200382003820038
1020420037155000000084196872510100100100001001000050028476802001802003720037184223187451010020010000200200002003720037111020110099100100100001000000000071021642197910100001002003820038200382003820038
102042003715600000001521968725101001001000010010000500284768020018020037200371842231874510100200100002002000020037200372110201100991001001000010000214823071021622197910100001002003820038200382003820038
10204200371550100000103196872510100100100001001000050028476802001802003720037184223187451010020010000200200002003720037111020110099100100100001000000000071021632197910100001002003820038200382003820038
102042003715500001200103196872510100100100001001000050028476802001802003720037184223187451010020010000200200002003720037111020110099100100100001000000103071021622197910100001002003820038200382003820038
1020420037155000000061196872510100100100001001000050028476802001802003720037184223187451010020010000200200002003720037111020110099100100100001000000100071021622197910100001002003820038200382003820038
10204200371550000600107196872510100100100001001000050028476802001802003720037184223187451010020010000200200002003720037111020110099100100100001000000000071021622197910100001002003820038200382003820038
1020420037155000000061196872510100100100001001000050028476802001802003720037184223187451010020010000200200002003720037111020110099100100100001000000000071021622197910100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)03181e3f4e51inst 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)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)9fa0a1a8a9acc2cfd0d5d6ddinst fetch restart (de)dfe0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024200371500061196872510010101000010100005028476800020018200372003718444031876710010201000020200002003720037111002110910101000010000000640051622019785010000102003820038200382003820038
10024200371500061196872510010101000010100005028476800020018200372003718444031876710010201000020200002003720037111002110910101000010000000640021622019785010000102003820038200382003820038
10024200371500061196872510010101000010100005028476801020018200372003718444031876710010201000020200002003720037111002110910101000010000000640021622019785010000102003820038200382003820038
10024200371500061196872510010101000010100005028476801020018200372003718444031876710010201000020200002003720037111002110910101000010022030640021622019785010000102003820038200382003820038
10024200371500061196872510010101000010100005028476801020018200372003718444031876710010201000020200002003720037111002110910101000010000000640021622019785010000102003820038200382003820038
10024200371500061196872510010101000010101525028476800020018200372003718444031876710010201000020200002003720037111002110910101000010000000640021622019785010000102003820038200382003820038
10024200371500061196872510010101000010100005028476801020018200372003718444031876710010201000020200002003720037111002110910101000010000000640021622019785010000102003820038200382003820038
100242003715000726196872510010101000010100005028476801020018200372003718444031876710010201000020200002003720037111002110910101000010000000640021622019785010000102003820038200382003820038
10024200371500061196872510010101000010100005028476801020018200372003718444031876710010201000020200002003720037111002110910101000010400000640021622019785010000102003820038200382003820038
10024200371500061196872510010101000010100005028476800020018200372003718444031876710010201000020200002003720037111002110910101000010000000640021622019785010000102003820038200382003820038

Test 3: Latency 1->3

Code:

  xar v0.2d, v1.2d, v0.2d, #3
  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)03191e1f3f4e51inst 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
10204200371560006119687251010010010000100100005002847680020018200372003718429718741101002001000820020016200372003711102011009910010010000100001117180160019801100001002003820038200382003820038
10204200371560006119687251010010010000100100005002847680020018200372003718429718740101002001000820020016200372003711102011009910010010000100001117170160019802100001002003820038200382003820038
10204200371550006119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
10204200371560006119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
10204200371560006119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
10204200371550006119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
10204200371550008919687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
10204200371550006119687251010010010000100100005002847680120018200372003718422318745101002001082820020000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
102042003715601206119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
10204200371550006119687251010010010000100100005002847680020018200372003718422318745101002001000020020000200372003711102011009910010010000100030007101161119791100001002003820038200382003820038

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)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)9fa8accfd2d5d6daddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024200371560103196872510010101000010100005028476801200180200372003718444318767100102010000202000020037200371110021109101010000100068203160221978510000102003820038200382003820038
1002420037155061196872510010101000010100005028476801200180200372003718444318767100102010000202000020037200371110021109101010000100064002160221978510000102003820038200382003820038
1002420037155061196872510010101000010100005028476800200180200372003718444318767100102010000202000020037200371110021109101010000100064002160221978510000102003820038200382003820038
1002420037156084196872510010101000010100005028476801200180200712003718444318767100102010000202000020037200371110021109101010000100064002160221978510000102003820038200382003820038
1002420037155061196872510010101000010100005028476800200180200372003718444318767100102010000202000020037200371110021109101010000100064002160221978510000102003820038200382003820038
1002420037155061196872510010101000010100005028476801200180200372003718444318767100102010000202000020037200371110021109101010000100064002160221978510000102003820038200382003820038
1002420037155061196872510010101000010100005028476800200180200372003718444318767100102010000202000020037200371110021109101010000100064002160221978510000102003820038200382003820038
10024200371550103196872510010101000010100005028476800200180200372003718444318767100102010000202000020037200371110021109101010000100064002160221978510000102003820038200382003820038
10024200371550726196872510010101000010100005028476801200180200372003718444318767100102010000202000020037200371110021109101010000101064002160221978510000102003820038200852003820038
100242003715501171196872510010101000010100005028476801200180200372003718444318767100102010000202000020037200371110021109101010000100364002160221978510000102003820038200382003820038

Test 4: throughput

Count: 8

Code:

  xar v0.2d, v8.2d, v9.2d, #3
  xar v1.2d, v8.2d, v9.2d, #3
  xar v2.2d, v8.2d, v9.2d, #3
  xar v3.2d, v8.2d, v9.2d, #3
  xar v4.2d, v8.2d, v9.2d, #3
  xar v5.2d, v8.2d, v9.2d, #3
  xar v6.2d, v8.2d, v9.2d, #3
  xar v7.2d, v8.2d, v9.2d, #3
  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)031e3f51inst 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
802042005815608225801001008000010080000500640000020019200382003899733999680100200800002001600002003820038118020110099100100800001000051102161120035800001002003920039200392003920039
802042003815604025801001008000010080000500640000020019200382003899733999680100200800002001600002003820038118020110099100100800001000051101162220035800001002003920039200392003920039
802042003815504025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000051101161120035800001002003920039200392003920039
8020420038155124025801001008000010080000500640000020019200382003899733999680100200803942001600002003820038118020110099100100800001000051101161120035800001002003920039200392003920039
802042003815504025801001008000010080000500640000020019200382003899733999680100200800002001600002003820038118020110099100100800001000051101161120035800001002003920039200392003920039
802042003815504025801001008000010080000500640000020019200382003899733999680100200800002001600002003820038118020110099100100800001000051101161120035800001002003920039200392003920039
802042003815504025801001008000010080000500640000020019200382003899733999680100200800002001600002003820038118020110099100100800001000051101161120035800001002003920039200392003920039
802042003816504025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000051101161120035800001002003920039200392003920039
8020420038156070525801001008000010080000500640000020019200382003899733999680100200800002001600002003820091118020110099100100800001000351101161120035800001002003920039200392003920039
802042003815504025801001008000010080000500640000020019200382003899733999680100200800002001600002003820038118020110099100100800001000051101161120035800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)031e3f51inst 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)9fa1a8accfd0d2d5d6ddinst fetch restart (de)e0? int output thing (e9)eaeb? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242003915508325800101080000108000050640000020019200382003899963100188001020800002016000020038200381180021109101080000100035020260616112003500080000102003920039200392003920039
8002420038155123925800101080000108000050640000020019200382003899963100188001020800002016000020038200381180021109101080000100005020230216112003502080000102003920039200392003920039
800242003816603925800101080000108000050640000020019200382003899963100188001020800002016000020038200381180021109101080000100005020260116112003500080000102003920039200392003920039
800242003815503925800101080000108000050640000020019200382003899963100188001020800002016000020038200381180021109101080000100005020260116112003500080000102003920039200392003920039
8002420038155573925800101080000108000050640000020019200382003899963100188001020800002016000020038200381180021109101080000100005020260116112003500080000102003920039200392003920039
800242003815503925800101080000108000050640000020019200382003899963100188001020800002016000020038200381180021109101080000100105020230116112003500080000102003920039200392003920039
800242003815503925800101080000108000050640000020019200382003899963100188001020800002016000020038200381180021109101080000100005020230116112003500080000102003920039200392003920039
800242003815608125800101080000108000050640000020019200382003899963100188001020800002016000020139200381180021109101080000100005020264216112003500080000102003920039200392003920039
800242003815563925800101080000108000050640000020019200382003899963100188001020800002016000020038200381180021109101080000100005020260116112003500080000102003920039200392003920039
800242003815503925800101080000108000050640000020019200382003899963100188001020800002016000020038200381180021109101080000100005020290216112003500080000102003920039200392003920039