Apple M1 Microarchitecture Research by Dougall Johnson

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

SQSHL (vector, 2D)

Test 1: uops

Code:

  sqshl v0.2d, v0.2d, v1.2d
  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)0307080b18191e1f3a3f4e51inst 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)a1a8a9accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
100420371500000000611687251000100010002646801201820372037157231895100010002000203720371110011000000073316221787100020382038203820382038
1004203715000000003131687251000100010002646801201820372037157231895100010002000203720371110011000000073216221787100020382038203820382038
100420371500000000611687251000100010002646801201820372037157231895100010002000203720371110011000000073216221787100020382038203820382038
100420371500000000611687251000100010002646801201820372037157231895100010002000203720371110011000000073216221787100020382038203820382038
100420371600000000611687251000100010002646801201820372037157231895100010002000203720371110011000000073216221787100020382038203820382038
100420371500000000611687251000100010002646801201820372037157231895100010002000203720371110011000000073216221787100020382038203820382038
100420371500000000611687251000100010002646801201820372037157231895100010002000203720371110011000000073216221787100020382038203820382038
100420371500000900611687251000100010002646801201820372037157231895100010002000203720371110011000000073216221787100020382038203820382038
100420371500000000611687251000100010002646801201820372037157231895100010002000203720371110011000000073216221787100020382038203820382038
100420371500000000611687251000100010002646801201820372037157231895100010002000203720371110011000000073216221787100020382038203820382038

Test 2: Latency 1->2

Code:

  sqshl v0.2d, v0.2d, v1.2d
  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)9fa0a9accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204200371500611968725101001001000010010000500284768012001802003720037184223187451010020010000200200002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
102042003715001701968725101001001000010010000500284768012001802003720037184223187451010020010000200200002003720037111020110099100100100001000007101163219879100001002003820038200382003820038
10204200371500611968725101001001000010010000500284768002001802008420037184223187451010020010000200200002003720037111020110099100100100001002207101161119791100001002003820038200382003820038
10204200371500611968725101001001000010010000500284768012001802003720037184223187451010020010000200200002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
10204200371500611968725101001001000010010000500284768012001802003720037184223187451010020010000200200002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
10204200371490611968725101001001000010010000500284768012001802003720037184223187451010020010000200200002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
10204200371500611968725101001001000010010000500284768012001802003720037184223187451010020010000200200002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
10204200371500611968725101001001000010010000500284896312001802003720037184223187451010020010000200200002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
10204200371500611968725101001001000010010000500284768012001802003720037184223187451010020010000200200002003720037111020110099100100100001000007101161119791100001002003820038200382003820038
10204200371500611968725101001001000010010000500284768012001802003720037184223187451010020010000200200002003720037111020110099100100100001000007101161119791100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)03070a0b1e3a3f4e51inst 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)9fa1a8cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1002420037150110026819687251001010100001010000502847680120018200372003718444031876710010201000020200002003720037111002110910101000010006441016121219785010000102003820038200382003820038
10024200371501100268196872510010101000010100005028476800200182003720037184440318767100102010000202000020037200371110021109101010000100064481651019785010000102003820038200382003820038
100242003715011032104319687251001010100001010000502847680020018200372003718444031876710010201000020200002003720037111002110910101000010006441016121019785010000102003820038200382003820038
1002420037150110026819687251001010100001010000502847680120018200372003718444031876710010201000020200002003720037111002110910101000010006441016101019785010000102003820038200382003820038
1002420037150110026819687251001010100001010000502847680020018200372003718444031876710010201000020200002003720037111002110910101000010006441216101119785010000102003820038200382003820038
1002420037150110026819687251001010100001010000502847680120018200372003718444031876710010201000020200002003720037111002110910101000010006441216101019794010000102003820038200382003820038
100242003715011002681968725100101010000101000050284768012001820037200371844403187671001020100002020000200372003711100211091010100001000644111651019785010000102003820038200382003820038
10024200371501100211019687251001010100001010000502847680120018200372003718444031876710010201000020200002003720037111002110910101000010016441016101019785010000102003820038200382003820038
10024200371501100211019687251001010100001010000502847680120018200372003718444031876710010201000020200002003720037111002110910101000010016441116101019785010000102003820038200382003820038
1002420037150110921101968725100101010000101000050284768012001820037200371844403187671001020100002020000200372003711100211091010100001040644101610519785010000102003820038200382003820038

Test 3: Latency 1->3

Code:

  sqshl v0.2d, v1.2d, v0.2d
  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)9fa6a7a8acc5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204200371501566119687251010010010000100100005002847680120018020037200371842971874110100200100082002001620037200371110201100991001001000010000001117170160019801100001002003820038200382003820038
102042003715006119687251010010010000100100005002847680020018020037200371842961874110100200100082002001620037200371110201100991001001000010000001117170160019802100001002003820038200382003820038
102042003715006119687251010010010000100100005002847680020018020037200371842231874510100200100002002000020037200371110201100991001001000010000000007101161119791100001002003820038200382003820038
1020420037150044119687251010010010000100100005002847680020018020037200371842231874510100200100002002000020037200371110201100991001001000010000000007101161119791100001002003820038200382003820038
102042003715006119687251010010010000100100005002847680120018020085200371842331874510100200100002002000020037200371110201100991001001000010000000007101161119791100001002003820038200382003820038
1020420037150396119687251010010010000100100005002847680120018320037200371842231874510100200100002002000020037200371110201100991001001000010000000007101161119791100001002003820038200382003820038
1020420037150126119687251010010010000100100005002847680120018020037200371842231874510100200100002002000020037200371110201100991001001000010000000007101161119791100001002003820038200382003820038
1020420037150666119687251010010010000100100005002847680120018020037200371842231874510100200100002002000020037200371110201100991001001000010000000007101161119791100001002003820038200382003820038
102042003715006119687251010010010000100100005002847680120018020037200371842231874510100200100002002000020037200371110201100991001001000010000000007101164119791100001002003820038200382003820038
102042003715006119687251010010010000100100005002847680020018020037200371842231874510100200100002002000020037200371110201100991001001000010000000007101161119791100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)03080f1e3f4e51inst 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
1002420037150001261196872510010101000010100005028476800200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
10024200371500015961196872510010101000010100005028476800200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
100242003715000155361968725100101010000101000050284768002001820037200371844427187671001020100002020000200372003711100211091010100001000640216221992910000102003820038200382003820038
100242003715000061196872510010101000010100005028476800200182013120085184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
10024200371500036061196872510010101000010100005028476800200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
100242003714901131861196872510010101000010100005028476800200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
10024200371500040561196872510010101000010100005028476800200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
100242003715000061196872510010101000010100005028476800200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
1002420037150001561196872510010101000010100005028476800200182003720037184473187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038
1002420037150002761196872510010101000010100005028476800200182003720037184443187671001020100002020000200372003711100211091010100001000640216221978510000102003820038200382003820038

Test 4: throughput

Count: 8

Code:

  sqshl v0.2d, v8.2d, v9.2d
  sqshl v1.2d, v8.2d, v9.2d
  sqshl v2.2d, v8.2d, v9.2d
  sqshl v3.2d, v8.2d, v9.2d
  sqshl v4.2d, v8.2d, v9.2d
  sqshl v5.2d, v8.2d, v9.2d
  sqshl v6.2d, v8.2d, v9.2d
  sqshl v7.2d, v8.2d, v9.2d
  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)03090b18191e1f3f51inst 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)9fa0a1a6a7a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
802042006015000000040258010010080000100800005006400001200192003820038997339996801002008000020016000020038200381180201100991001008000010000000000516025111200350800001002003920039200392003920039
802042003815000000040258010010080000100800005006400000200192003820038997339996801002008000020016000020038200381180201100991001008000010000000000511011611200350800001002003920039200392003920039
8020420038150000015040258010010080000100800005006407640200192003820038997339996801002008000020016000020038200381180201100991001008000010000000000511011611200350800001002003920039200392003920039
8020420038150000000103258010010080000100800005006400000200192003820038997339996801002008000020016000020038200381180201100991001008000010000000000511011611200350800001002003920039200392003920039
8020420038150000000151258010010080000100800005006400001200192003820038997339996801002008000020016000020038200381180201100991001008000010000000000511011611200350800001002003920039200392003920039
8020420038150000000705258040210080000100800005006400000200192003820038997339996801002008000020016000020038200381180201100991001008000010000000000511011611200350800001002003920039200392003920039
802042003815000000040258010010080000100800005006400001200192003820038997339996801002008000020016000020038200381180201100991001008000010000000000511011611200350800001002003920039200392003920039
802042003815000000040258010010080000100800005006400001200192003820038997339996801002008000020016000020038200381180201100991001008000010000000000511011611200350800001002003920039200392003920039
8020420190150000012040258010010080000100800005006400000200192003820038997339996801002008000020016000020038200381180201100991001008000010000000090511011611200350800001002003920039200392003920039
8020420038150000000103258010010080000100800005006400000200192003820038997339996801002008000020016000020038200384180201100991001008000010000202000511011611200740800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)030b18191e1f3f51inst 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)5f60696d6edispatch 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
8002420039150000339039258001010800001080000506400000020019200382003899963100188001020800002016000020038200381180021109101080000105020116112003580000102003920039200392003920039
80024200381500000039258001010800001080000506400000020019200382003899963100188001020800002016000020038200381180021109101080000105020116112003580000102003920039200392003920039
80024200381500000039258001010800001080000506400000120019200382003899963100188001020800002016000020038200381180021109101080000105020116112003580000102003920039200392003920039
80024200381500000039258001010800001080000506400000120019200382003899963100188001020800002016000020038200381180021109101080000105020116112003580000102003920039200392003920039
80024200381500000039258001010800001080000506400000020019200382003899963100188001020800002016000020038200381180021109101080000105020116112003580000102003920039200392003920039
80024200381500000039258001010800001080000506400000020019200382003899963100188001020800002016000020038200381180021109101080000105020116112003580000102003920039200392003920039
80024200381500000039258001010800001080000506400000020019200382003899963100188001020800002016000020038200381180021109101080000105020116112003580000102003920039200392003920039
80024200381500000039258001010800001080000506400000120019200382003899963100188001020800002016000020038200381180021109101080000105020116112003580000102003920039200392003920039
80024200381500000039258001010800001080000506400000020019200382003899963100188001020800002016000020038200381180021109101080000105020116112003580000102003920039200392003920039
80024200381500006039258001010800001080000506400000020019200382003899963100188001020800002016000020038200381180021109101080000105020116112003580000102003920039200392003920039