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, msl)

Test 1: uops

Code:

  mvni v0.4s, #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)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)a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
10042882040251000100010007000026928828812331461000100028828811100110000073316112851000289289289289289
10042882040251000100010007000026928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000026928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000026928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000026928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000026928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000026928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000026928828812331461000100028828811100110001073116112851000289289289289289
10042882040251000100010007000026928828812331461000100028828811100110000073116112851000289289289289289
10042882040251000100010007000026928828812331461000100028828811100110000073116112851000289289289289289

Test 2: throughput

Count: 8

Code:

  mvni v0.4s, #3, msl #8
  mvni v1.4s, #3, msl #8
  mvni v2.4s, #3, msl #8
  mvni v3.4s, #3, msl #8
  mvni v4.4s, #3, msl #8
  mvni v5.4s, #3, msl #8
  mvni v6.4s, #3, msl #8
  mvni v7.4s, #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)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)9faccdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
802042005615506125801001008000010080000500560000120019200382003899733999680100200800002002003820038118020110099100100800001000051102162220035800001002003920039200392003920039
802042003815604025801001008000010080000500560000120019200382003899733999680100200800002002003820038118020110099100100800001003051102162220035800001002003920039200392003920039
802042003815504025801001008000010080000500560000120019200382003899733999680100200800002002003820038118020110099100100800001000051102162220035800001002003920039200392003920039
802042003815608225801001008000010080000500560000120019200382003899733999680100200800002002003820038118020110099100100800001000051102162220035800001002003920039200392003920039
802042003815504025801001008000010080000500560000020019200382003899733999680100200800002002003820038118020110099100100800001000051102162220035800001002003920039200392003920039
802042003815504025801001008000010080000500560000020019200382003899733999680100200800002002003820038118020110099100100800001000051102162220035800001002003920039200392003920039
802042003815534025801001008000010080000500560000020019200382003899733999680100200800002002003820038118020110099100100800001000051102162220035800001002003920039200392003920039
802042003815504025801001008000010080000500560000120019200382003899733999680100200800002002003820038118020110099100100800001000051102162220035800001002003920039200392003920039
802042003815504025801001008000010080000500560000020019200382003899733999680100200800002002003820038118020110099100100800001000051102162220035800001002003920039200392003920039
8020420038155012625801001008000010080000500560000120019200382003899733999680100200800002002003820038118020110099100100800001000051102162220035800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)030b191e1f3f51inst 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)9fa8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242003915600006082580010108000010800005056000012001920038200389996310018800102080000202003820038118002110910108000010005020516452003580000102003920039200392003920039
800242009716101088622580010108000010800005056000012001920038200389996310018800102080000202003820038118002110910108000010105020516552003580000102003920039200392003920039
80024200381550000392580010108000010800005056000012001920038200389996310018800102080000202003820038118002110910108000010035020616752003580000102003920039200392003920039
80024200381550000392580010108000010800005056000012001920038200389996310018800102080000202008920038118002110910108000010005020616552003580000102003920039200392003920039
800242003815500006182580010108000010800005056000012001920038200389996310018800102080000202003820038118002110910108000010005020616552003580000102003920039200392003920039
800242003815500006102580010108000010800005056000012001920038200389996310018800102080000202003820038118002110910108000010005020516552003580000102003920039200392003920039
800242003815600001042580010108000010800005056000012001920038200869996310044801112080000202003820086118002110910108000010005040616562003580000102003920039200392003920088
800242003815610120812580010108000010800005056000012001920038200389996310018800102080000202003820038118002110910108000010005020616672003580000102003920039200392003920039
800242003815500003172580010108000010800005056000012001920038200389996310018800102080000202003820038118002110910108000010005020616652003580000102003920039200392003920039
800242003815500002682580010108000010800005056000012001920038200389996310018800102080000202003820038118002110910108000010005020516552003580000102003920039200392003920039