Apple M1 Microarchitecture Research by Dougall Johnson

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

SHLL (vector, 2D)

Test 1: uops

Code:

  shll v0.2d, v0.2s, #32
  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)030b1e3f4e51inst 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
1004203715006116862510001000100026452102018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203715006116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203715036116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203715006116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203715006116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
10042037150306116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203715006116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203715006116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203715006116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203715006116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038

Test 2: Latency 1->2

Code:

  shll v0.2d, v0.2s, #32
  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)030818191e1f3f4e51inst 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)9fa0a1a8a9acc2cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102042003715000054061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000000007101161119791100001002003820038200382003820038
102042003715003045061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000000007101161119791100001002003820038200382003820038
10204200371500000061196862510100100100001001000050028475210200182003720037184213187451010020010000200100002003720037111020110099100100100001000000007101161119791100001002003820038200382003820038
102042003714900081061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000000007101161119791100001002003820038200382003820038
102042003715000045061196862510100100100001001000050028475210200182003720037184213187451010020010000200100002003720037111020110099100100100001000000007101161119791100001002003820038200382003820038
102042003715000069061196862510100100100001001000050028475210200182003720037184213187451010020010000200100002003720037111020110099100100100001000000007101161119791100001002003820038200382003820038
10204200371500006061196862510100100100001001000050028475210200182003720037184213187451010020010000200100002003720037111020110099100100100001000000007101161119791100001002003820038200382003820038
102042003715000057061196862510100100100001001000050028475210200182003720037184213187451010020010000200100002003720037111020110099100100100001000000007101161119791100001002003820038200382003820038
10204200371500003061196862510100100100001001000050028475210200182003720037184213187451010020010000200100002003720037111020110099100100100001000000007101161119791100001002003820038200382003820038
102042003715000060061196862510100100100001001000050028475210200182003720037184213187451010020010000200100002003720037111020110099100100100001000000007101161119791100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)0308090b0f18191e1f3f4e51inst 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
1002420037150000000780611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000000006404162219786010000102003820038200382003820038
100242003715000000000611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
100242003714900000000611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
100242003715000000000611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
100242003715000000000611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
1002420037150000000270611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
1002420037150000000240611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010000000006402172219786010000102003820038200382003820038
100242003715000000000611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
10024200371500000002760611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038
1002420037150000000120611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010000000006402162219786010000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  shll v0.2d, v8.2s, #32
  shll v1.2d, v8.2s, #32
  shll v2.2d, v8.2s, #32
  shll v3.2d, v8.2s, #32
  shll v4.2d, v8.2s, #32
  shll v5.2d, v8.2s, #32
  shll v6.2d, v8.2s, #32
  shll v7.2d, v8.2s, #32
  movi v8.16b, 9

(fused SUBS/B.cc loop)

100 unrolls and 100 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)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)9fa0a1a6a8a9acc5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
802042006115000060292580108100800081008002050064013220019200382003899776998980120200800322008003220038200381180201100991001008000010000000011151182162120035800001002003920039200392003920039
8020420038150000450292580108100800081008002050064013220019200382003899776998980120200800322008003220038200381180201100991001008000010000000011151181162220035800001002003920039200392003920039
802042003815000000292580108100800081008002050064013220019200382003899776998980120200800322008003220038200381180201100991001008000010000000011151181162220035800001002003920039200392003920039
8020420038150000120292580108100800081008002050064013220019200382003899776998980120200800322008003220038200381180201100991001008000010000000011151182162120035800001002003920039200392003920039
8020420038150000002925801081008000810080020500640132200192003820038997769989801202008003220080032200382003811802011009910010080000100000002411151182162220035800001002003920039200392003920039
8020420038150000210292580108100800081008002050064013220019200382003899776998980120200800322008003220038200381180201100991001008000010000000011151182162120035800001002003920039200392003920039
8020420038150000150292580108100800081008002050064013220019200382003899776998980120200800322008003220038200381180201100991001008000010000000011151182162120035800001002003920039200392003920039
802042003815000000292580108100800081008002050064013220019200382003899776998980120200800322008003220038200381180201100991001008000010001000011151181162120035800001002003920039200392003920039
802042003815000000292580108100800081008002050064013220019200382003899776998980120200800322008003220038200381180201100991001008000010000000011151181162120035800001002003920039200392003920039
8020420038150000120292580108100800081008002050064013220019200382003899776998980120200800322008003220038200381180201100991001008000010000000011151182162120035800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03181e1f3f51inst 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)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
8002420050150069039258001010800001080000506400000020019200382003899960310018800102080000208000020038200381180021109101080000100000502015161782003580000102003920039200392003920039
80024200381500003925800101080000108000050640000002001920038200389996031001880010208000020800002003820038118002110910108000010004735020171617172003580000102003920039200392003920039
800242003815000039258001010800001080000506400000020019200382003899960310018800102080000208000020038200381180021109101080000100000502017166172003580000102003920039200392003920039
800242003815000039258001010800001080000506400000120019200382003899960310018800102080000208000020038200381180021109101080000100000502017166172003580000102003920039200392003920039
80024200381500003925800101080000108000050640000002001920038200389996031001880010208000020800002003820038118002110910108000010000050206166172003580000102003920039200392003920039
8002420038150460392580010108000010800005064000000200192003820038999603100188001020800002080000200382003811800211091010800001000005020171617172003580000102003920039200392003920039
8002420038150039039258001010800001080000506400000020019200382003899960310018800102080000208000020038200381180021109101080000100000502017166172003580000102003920039200392003920039
800242003815000039258001010800001080000506400000020019200382003899960310018800102080000208000020038200381180021109101080000100000502061617172003580000102003920039200392003920039
8002420038150015039258001010800001080000506400000020019200382003899960310018800102080000208000020038200381180021109101080000100000502017161762003580000102003920039200392003920039
800242003815000039258001010800001080000506400000020019200382003899960310018800102080000208000020038200381180021109101080000100000502017166172003580000102003920039200392003920039