Apple M1 Microarchitecture Research by Dougall Johnson

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

FABS (vector, 2S)

Test 1: uops

Code:

  fabs v0.2s, v0.2s
  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)031e3f4e51inst issue (52)~issue fp/simd (54)~dispatch fp/simd (57)huge thing fp/simd (5b)696d6edispatch 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
10042037150611686251000100010002645212018203720371571318951000100010002037203711100110000073216111786100020382038203820382038
10042037150611686251000100010002645212018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
10042037150611686251000100010002645212018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
10042037150611686251000100010002645212018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
10042037150611686251000100010002645212018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
10042037150611686251000100010002645212018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
10042037160611686251000100010002645212018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
100420371506116862510001000100026452120182037203715713189510001000100020372037111001100001273116111786100020382038203820382038
100420371515611686251000100010002645212018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
10042037150611686251000100010002645212018203720371571318951000100010002037203711100110002073116111786100020382038203820382038

Test 2: Latency 1->2

Code:

  fabs v0.2s, v0.2s
  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)033f4e51inst 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)9fa8c5cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204200371506119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100007103161119791100001002003820038200382003820038
10204200371506119686251010010010000100100005002847521120018200372003718421318745101002001000020010664200372003711102011009910010010000100107101161119791100001002003820038200382003820038
10204200371506119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100027101161119791100001002003820038200382003820038
10204200371506119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
10204200371506119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
102042003715012419686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
10204200371506119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003751102011009910010010000100007101161119791100001002003820038200382003820038
10204200371506119686251010010010000100100005002847521020065200372003718421318745101002001000020010000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
10204200371506119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
10204200371496119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100007101161119791100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)031e3f4e51inst 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)9fa0a8accdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100242003715006119686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
1002420037150010319686251001010100001010000502847521020018200372003718443318767103172010000201050620037200371110021109101010000100000640216221978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521020018200372003718443318767100102010000201050420037200371110021109101010000100000640216221978610000102003820038200382003820038
1002420037150025119686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000642216221978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
100242003715008419686251001010100001010000502847521020018200372003718443318767100102010489201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038
1002420037150027919686251001010100001010000502847521020018200372003718443318767100102010000201000020037200371110021109101010000100000640216221978610000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  fabs v0.2s, v8.2s
  fabs v1.2s, v8.2s
  fabs v2.2s, v8.2s
  fabs v3.2s, v8.2s
  fabs v4.2s, v8.2s
  fabs v5.2s, v8.2s
  fabs v6.2s, v8.2s
  fabs v7.2s, v8.2s
  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)0307080a181e3f51inst 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)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)9fa0a8a9acc2c5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8020420057150101302925801081008000810080020500640132120019200382003899770699898012020080032200800322003820038118020110099100100800001000000011151184161120035800001002003920039200392003920039
8020420038150101002925801081008000810080020500640132120019200382003899770699898012020080032200800322003820038118020110099100100800001000000011151181161120035800001002003920039200392003920039
8020420038150101002925801081008000810080020500640132120019200382003899770699898012020080032200800322003820038118020110099100100800001000003011151181161120035800001002003920039200392003920039
8020420038150101009225801081008000810080020500640132020019200382003899770699898012020080032200800322003820038118020110099100100800001000000211151181161120035800001002003920039200392003920039
8020420038150101002925801081008000810080020500640132120019200382003899770699898012020080032200800322003820038118020110099100100800001000000011151181161120035800001002003920039200392003920039
8020420038150101002925801081008000810080020500640132020019200382003899770699898012020080032200800322003820038118020110099100100800001000000011151181161120035800001002003920039200392003920039
8020420038150101002925801081008000810080020500640132120019200382003899770699898012020080032200800322003820038118020110099100100800001000000011151181161120035800001002003920039200392003920039
8020420038150101002925801081008000810080020500640132120019200382003899770699898012020080032200800322003820038118020110099100100800001000000011151181161120035800001002003920039200392003920039
8020420038150101002925801081008000810080020500640132020019200382003899770699898012020080032200800322003820038118020110099100100800001000000011151181161120035800001002003920039200392003920039
8020420038150101002925801081008000810080020500640132120019200382003899770699898012020080032200800322003820038118020110099100100800001000000011151181161120035800001002003920039200392003920039

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)~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)9fa8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8002420051150039258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110910108000010005020216112003580000102003920039200392003920039
8002420038150039258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110910108000010005020116112003580000102003920039200392003920039
8002420038150039258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010005020116112003580000102003920039200392003920039
8002420038150039258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010005020116112003580000102003920039200392003920039
80024200381502739258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010005020116112003580000102003920039200392003920039
80024200381509514258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110910108000010005020116112003580000102003920039200392003920039
80024200381501539258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110910108000010005020116112003580000102003920039200392003920039
80024200381507539258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010005020116112003580000102003920039200392003920039
8002420038150939258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010005020116112003580000102003920039200392003920039
80024200381501244258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110910108000010005020116112003580000102003920039200392003920039