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, 4S, lsl)

Test 1: uops

Code:

  mvni v0.4s, #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)031e3f51inst 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)cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
100428820402510001000100070001269288288123314610001000288288111001100073116112851000289289289289289
100428820402510001000100070001269288288123314610001000288288111001100073116112851000289289289289289
100428820402510001000100070001269288288123314610001000288288111001100073116112851000289289289289289
100428820402510001000100070001269288288123314610001000288288111001100073116112851000289289289289289
100428830402510001000100070001269288288123314610001000288288111001100073116112851000289289289289289
100428820402510001000100070001269288288123314610001000288288111001100073116112851000289289289289289
1004288212402510001000100070001269288288123314610001000288288111001100073116112851000289289289289289
100428820402510001000100070001269288288123314610001000288288111001100073116112851000289289289289289
100428830402510001000100070001269288288123314610001000288288111001100073116112851000289289289289289
100428820402510001000100070001269288288123314610001000288288111001100073116112851000289289289289289

Test 2: throughput

Count: 8

Code:

  mvni v0.4s, #3, lsl #8
  mvni v1.4s, #3, lsl #8
  mvni v2.4s, #3, lsl #8
  mvni v3.4s, #3, lsl #8
  mvni v4.4s, #3, lsl #8
  mvni v5.4s, #3, lsl #8
  mvni v6.4s, #3, lsl #8
  mvni v7.4s, #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)0308090b18191e1f3f51inst 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)9fa0a1a6a7a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8020420060156000000040258010010080000100800005005600000200192003820038997339996801002008000020020038200381180201100991001008000010000001000511021622200350800001002003920039200392003920039
8020420038155000000040258010010080000100800005005600000200192003820038997339996801002008000020020038200381180201100991001008000010000000000511021622200350800001002003920039200392003920039
8020420038155000000040258010010080000100800005005600000200192003820038997339996801002008000020020038200381180201100991001008000010000000000511021622200350800001002003920039200392003920039
8020420038155000000040258010010080000100800005005600000200192003820038997339996801002008000020020038200381180201100991001008000010000000000511021622200350800001002003920039200392003920039
802042003815500000174061258010010080000100800005005600000200192003820038997339996801002008000020020038200381180201100991001008000010000000000511021622200350800001002003920039200392003920039
8020420038155000000040258010010080000100800005005600000200192003820038997339996801002008000020020038200381180201100991001008000010000000000511021622200350800001002003920039200392003920039
8020420038155000000040258010010080000100800005005600000200192003820038997339996801002008000020020038200381180201100991001008000010000000000511021622200350800001002003920039200392003920039
8020420038155000000040258010010080000100800005005600000200192003820038997339996801002008000020020038200381180201100991001008000010000000000511021622200350800001002003920039200392003920039
8020420038155000000040258010010080000100800005005600000200192003820038997339996801002008000020020038200381180201100991001008000010000000000511021622200350800001002003920039200392003920039
8020420038155000000040258010010080000100800005005600000200192003820038997339996801002008000020020038200381180201100991001008000010000000000511021622200350800001002003920039200392003920039

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)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)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)9fa6a8accfd5d6d9ddinst fetch restart (de)e0ec? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242003915503925800101080000108000050560000112001920038200389996310018800102080000202003820038118002110910108000010000502051606520035080000102003920039200392003920039
800242003815503925800101080000108000050560000002001920038200389996310018800102080000202003820038118002110910108000010000502061607720035080000102003920039200392003920039
8002420038155021025800101080000108000050560000002001920038200389996310018800102080000202003820038118002110910108000010000502051605720035080000102003920039200392003920039
800242003815503925800101080000108000050560000002001920038200389996310018800102080000202003820038118002110910108000010010502051606520035080000102003920039200392003920039
800242003815503925800101080000108000050560000102001920038200389996310018800102080000202003820038118002110910108000010000502051605520035080000102003920039200392003920039
8002420038155067258001010800001080000505600000020019200382003899963100188001020800002020038200381180021109101080000100005020716076200356580000102003920039200392003920039
8002420038155153925800101080000108000050560000002001920038200389996310018800102080000202003820038118002110910108000010000502071606520035080000102003920039200392003920039
800242003815503925800101080000108000050560000002001920038200389996310018800102080000202003820038118002110910108000010000502061605720035080000102003920039200392003920039
800242003815603925800101080000108000050560000102001920038200389996310018800102080000202003820038118002110910108000010000502061606520035080000102003920039200392003920039
800242003816703925800101080000108000050560000002001920038200389996310018800102080000202003820038118002110910108000010000502071605620035080000102003920039200392003920039