Apple M1 Microarchitecture Research by Dougall Johnson

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

MOVI (vector, 2S, msl)

Test 1: uops

Code:

  movi v0.2s, #3, msl #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)031e3a3f51inst 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)a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
100428820140251000100010007000126928828812331461000100028828811100110000073616342851000289289289289289
100428820040251000100010007000126928828812331461000100028828811100110000073316332851000289289289289289
100428820040251000100010007000126928828812331461000100028828811100110000073316332851000289289289289289
100428820040251000100010007000126928828812331461000100028828811100110000073316332851000289289289289289
100428820040251000100010007000126928828812331461000100028828811100110003073316442851000289289289289289
100428820040251000100010007000126928828812331461000100028828811100110000073316332851000289289289289289
100428820040251000100010007000126928828812331461000100028828811100110000073316332851000289289289289289
100428820040251000100010007000126928828812331461000100028828811100110000073316332851000289289289289289
100428830040251000100010007000126928828812331461000100028828811100110000073316332851000289289289289289
100428820040251000100010007000126928828812331461000100028828811100110000073316332851000289289289289289

Test 2: throughput

Count: 8

Code:

  movi v0.2s, #3, msl #8
  movi v1.2s, #3, msl #8
  movi v2.2s, #3, msl #8
  movi v3.2s, #3, msl #8
  movi v4.2s, #3, msl #8
  movi v5.2s, #3, msl #8
  movi v6.2s, #3, msl #8
  movi v7.2s, #3, msl #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)03080a0b18191e1f3f51inst 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)9fa0a1a6a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
802042005815500000004025801001008000010080000500560000020019200382003899733999680100200800002002003820038118020110099100100800001000000000511031633200350800001002003920039200392003920039
802042003815600000004025801001008000010080000500560000020019200382003899733999680100200800002002003820038118020110099100100800001000001000511031633200350800001002003920039200392003920039
802042003815500000004025801001008000010080000500560000020019200382003899733999680100200800002002003820038118020110099100100800001000000000511031633200350800001002003920039200392003920039
802042003815500000004025801001008000010080000500560000020019200382003899733999680100200800002002003820038118020110099100100800001000000000511031633200350800001002003920039200392003920039
802042003815500000004025801001008000010080000500560000020019200382003899733999680100200800002002003820038118020110099100100800001000000000511031633200350800001002003920039200392003920039
802042003815500000004025801001008000010080000500560000020019200382003899733999680100200800002002003820038118020110099100100800001000000000511031633200350800001002003920039200392003920039
802042003815500000004025801001008000010080000500560000020019200382003899733999680100200800002002003820038118020110099100100800001000000030511031633200350800001002003920039200392003920039
802042003815502000004025801001008000010080000500560000020019200382003899733999680100200800002002003820038118020110099100100800001000000000511031633200350800001002003920039200392003920039
802042003815602000008225801001008000010080000500560000020019200382003899733999680100200800002002003820038118020110099100100800001000000000511031633200350800001002003920039200392003920039
802042003815502000004025801001008000010080000500560000020019200382003899733999680100200800002002003820038118020110099100100800001000000000511031633200350800001002003920039200392003920039

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)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)9fa8accfd5d6d9dadbddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8002420047155087425800101080000108000050560000020019200382003899963100188001020800002020038200381180021109101080000100050205160005520035080000102003920039200392003920039
800242003816106725800101080000108000050560000020019200382003899963100188001020800002020038200381180021109101080000100050204160004420035080000102003920039200392003920039
800242003815503925800101080000108000050560000020019200382003899963100188001020800002020038200381180021109101080000100350206160004420035080000102003920039200392003920039
800242003815503925800101080000108000050560000020019200382003899963100188001020800002020038200381180021109101080000100050205160007520035080000102003920039200392003920039
800242003815503925800101080000108000050560000020019200382003899963100188001020800002020038200381180021109101080000100050206160007620035080000102003920039200392003920039
800242003815503925800101080000108000050560000020019200382003899963100188001020800002020038200381180021109101080000100050206160008720035080000102003920039200392003920039
800242003815503925800101080000108000050560000020019200382003899963100188001020800002020038200381180021109101080000100050206160005520035080000102003920039200392003920039
8002420038155014425800101080000108000050560000020019200382003899963100188001020800002020038200381180021109101080000100050204160005520035080000102003920039200392003920039
8002420038155016925800101080000108000050560000020019200382003899963100188001020800002020038200381180021109101080000100050204160006620035080000102003920039200392003920039
8002420038156010225800101080000108000050560000020019200382003899963100188001020800002020038200381180021109101080000100050205160005620035080000102003920039200392003920039