Apple M1 Microarchitecture Research by Dougall Johnson

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

MVNI (vector, 2S, lsl)

Test 1: uops

Code:

  mvni v0.2s, #3, lsl #8

(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)03081e3f51inst 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)8283pipeline redirect (84)85inst all (8c)inst neon or fp (9a)a1a6a8accfd0d2d5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
1004288200402510001000100070001269288288123314610001000288288111001100000007300116112851000289289289289289
1004288200402510001000100070001269288288123314610001000288288111001100000007300116112851000289289289289289
1004288200402510001000100070001269288288123314610001000288288111001100000007300116112851000289289289289289
1004288200402510001000100070001269288288123314610001000288288111001100000007300116112851000289289289289289
1004288200402510001000100070001269288288123314610001000288288111001100000007300116112851000289289289289289
1004288200402510001000100070001269288288123314610001000288288111001100000007300116112851000289289289289289
1004288200402510001000100070001269288288123314610001000288288111001100000007300116112851000289289289289289
1004288300402510001000100070001269288288123314610001000288288111001100000007300116112851000289289289289289
1004288200402510001000100070001269288288123314610001000288288111001100000007300116112851000289289289289289
1004288200402510001000100070001269288288123314610001000288288111001100000007300116112851000289289289289289

Test 2: throughput

Count: 8

Code:

  mvni v0.2s, #3, lsl #8
  mvni v1.2s, #3, lsl #8
  mvni v2.2s, #3, lsl #8
  mvni v3.2s, #3, lsl #8
  mvni v4.2s, #3, lsl #8
  mvni v5.2s, #3, lsl #8
  mvni v6.2s, #3, lsl #8
  mvni v7.2s, #3, lsl #8

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

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

retire (01)cycle (02)03080b191e3f51inst 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)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? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8020420058155000452925801081008000810080020500560128120019200382003810003699898012020080032200200382003811802011009910010080000100300511021622200350800001002003920039200392003920039
802042003815500002302580100100800001008000050056000002001920038200389973399968010020080000200200382003811802011009910010080000100000511021622200350800001002003920039200392003920039
80204200381550000402580100100800001008000050056000002001920038200389973399968010020080000200200382003811802011009910010080000100000511021622200350800001002003920039200392003920039
80204200381560000402580100100800001008000050056000002001920038200389973399968010020080000200200382003811802011009910010080000100000511021622200350800001002003920039200392003920039
80204200381560000402580100100800001008000050056000002001920038200389984399968010020080000200200382003811802011009910010080000100009511021622200350800001002003920039200392003920039
80204200381550001654025801001008000010080000500560000020019200382003810008399968010020080000200200382003811802011009910010080000100000511021622200350800001002003920039200392003920039
802042003815601024402580100100800001008000050056000002001920038200389987399968010020080000200200382003811802011009910010080000100003511021622200350800001002003920039200392003920039
80204200381560000402580100100800001008000050056066802001920038200389973399968010020080000200200382003811802011009910010080000100000511021622200350800001002003920039200392003920039
802042003815600021402580100100800001008000050056000002005720038200389973399968010020080000200200382003811802011009910010080000100000511021622200350800001002003920039200392003920039
80204200381550000402580100100800001008000050056000012001920038200389973399968010020080000200200382003811802011009910010080000100000511021622200350800001002003920039200392003920039

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)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)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)9fa6a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242004715600012908125800101080000108000050560000120019200382003899963100188001020800002020038200381180021109101080000100000050209165720035080000102003920039200392003920039
80024200381550001206125800101080000108000050560000120019200382003899963100188001020800002020038200381180021109101080000100000050207167520035080000102003920039200392003920039
8002420038155000003925800101080000108000050560000120019200382003899963100188001020800002020038200381180021109101080000100000050206164620035080000102003920039200392003920039
8002420038155000003925800101080000108000050560000120019200382003899963100188001020800002020038200381180021109101080000100000050206165620035080000102003920039200392003920039
80024200381550001203925800101080000108000050560000120019200382003899963100448001020800002020038200381180021109101080000100000050206166420035080000102003920039200392003920039
8002420038155000003925800101080000108000050560000120019200382003899963100188001020800002020038200381180021109101080000100000050207166620035080000102003920039200392003920039
8002420038155000003925800101080000108000050560000120019200382003899963100188001020800002020038200381180021109101080000100000050205166520035080000102003920039200392003920039
80024200381550001803925800101080000108000050560000120019200382003899963100188001020800002020038200381180021109101080000100000050206167520035080000102003920039200392003920039
80024200381550002103925800101080000108000050560000120019200382003899963100188001020800002020038200381180021109101080000100000050206164720035080000102003920039200392003920039
800242003815500033039258001010800001080000505600001200192003820038999619100188001020800002020038200381180021109101080000100000050204166620035080000102003920039200392003920039