Apple M1 Microarchitecture Research by Dougall Johnson

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

FMAXNMP (scalar)

Test 1: uops

Code:

  fmaxnmp d0, v0.2d
  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
10042037150611686251000100010002645212018203720371571318951000100020002037203711100110000673116111786100020382038203820382038
10042037160611686251000100010002645212018203720371571318951000100020002037203711100110000073116111786100020382038203820382038
10042037150611686251000100010002645212018203720371571318951000100020002037203711100110000373116111786100020382038203820382038
10042037150611686251000100010002645212018203720371571318951000100020002037203711100110000073116111786100020382038203820382038
100420371601561686251000100010002645212018203720371571318951000100020002037203711100110000073116111786100020382038203820382038
10042037150611686251000100010002645212018203720371571318951000100020002037203711100110000073116111786100020382038203820382038
10042037150611686251000100010002645212018203720371571318951000100020002037203711100110000073116111786100020382038203820382038
10042037150611686251000100010002645212018203720371571318951000100020002037203711100110000073116111786100020382038203820382038
10042037150611686251000100010002645212018203720371571318951000100020002037203711100110002073116111786100020382038203820382038
10042037150611686251000100010002645212018203720371571318951000100020002037203711100110000073116111786100020382038203820382038

Test 2: Latency 1->2

Code:

  fmaxnmp d0, v0.2d
  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)0308181e1f3f4e51inst 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)9fa8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020420037150000014519686251010010010000100100005002847521020018200372003718421318745101002001000020020000200372003711102011009910010010000100000071011611197910100001002003820038200382003820038
10204200371500041406119686251010010010000100100005002847521120018200372003718421318745101002021000020020000200372003711102011009910010010000100000071011611197910100001002003820038200382003820038
10204200371500002646119686251010010010000100100005002847521020018200372003718421318745101002001000020020000200372003711102011009910010010000100000071011611197910100001002003820038200382003820038
102042003715000006119686251010010010000100100005002847521120018200372003718421318745101002001000020020000200372003711102011009910010010000100000071011611197910100001002003820038200382003820133
102042003715000006119686251010010010000100100005002847521120018200372008518425318745101002001000020020000200372003711102011009910010010000100000071011611197910100001002003820038200382003820038
102042003715000006119686251010010010000100100005002847521020018200372003718421318745101002001000020020000200372003711102011009910010010000100000071011611197910100001002003820038200382003820038
1020420037150000061196862510100100100001001000050028475211200182003720037184213187451010020010000200200002003720037111020110099100100100001000000710116111979120100001002003820038200382003820038
102042003715000006119686251010010010000100100005002847521020018200372003718421318745101002001000020020000200372003711102011009910010010000100000071011611197910100001002003820038201812003820038
102042003715000006119686251010010010000100100005002847521020018200372003718421318745101002001000020020000200372003711102011009910010010000100000071011611197910100001002003820038200382003820038
102042003714900008219686251010010010000100100005002847521020018200372003718421818745101002001000020020000200372003711102011009910010010000100000071011611197910100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)030b1e3f4e51inst 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)696b6d6edispatch 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)9fa1a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1002420037150002001968625100101010000101000050284752120018020037200371844331876710010201000020200002003720037111002110910101000010000640216221978610000102003820038200382003820038
100242003715000611968625100101010000101000050284752120018020037200371844331876710010201000020200002003720037111002110910101000010000640216221978610000102003820038200382003820038
100242003715000611968625100101010000101000050284752120018020037200371844331876710010201000020200002003720037111002110910101000010000640216221978610000102003820038200382003820038
10024200371500010091968625100101010000101000050284752120018020037200371844331876710010201000020200002003720037111002110910101000010000640216221978610000102003820038200382003820038
100242003715000611968625100101010000101000050284752120018020037200371844331876710010201000020200002003720037111002110910101000010000640216221978610000102003820038200382003820038
100242003715000611968625100101010000111000065284752120018020037200371844331876710010201000020200002003720037111002110910101000010000640216221978610000102003820038200382003820038
100242003715000611968625100101010000101000050284752120018020037200371844331876710010201000020200002003720037111002110910101000010000640216221978610000102003820038200382003820038
100242003715000611968625100101010000101000050284752120018020037200371844331876710010201000020200002003720037111002110910101000010000640216221978610000102003820038200382003820038
100242003715500611968625100101010000101000050284752120018020037200371844331876710010201000020200002003720037111002110910101000010000640216221978610000102003820038200382003820038
1002420037150008911968625100101010000101000050284752120018020037200371844331876710010201000020200002003720037111002110910101000010000640216221978610000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  fmaxnmp d0, v8.2d
  fmaxnmp d1, v8.2d
  fmaxnmp d2, v8.2d
  fmaxnmp d3, v8.2d
  fmaxnmp d4, v8.2d
  fmaxnmp d5, v8.2d
  fmaxnmp d6, v8.2d
  fmaxnmp d7, v8.2d
  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)0308090a0b18191e1f3a3f51inst 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)9fa0a1a6a8a9acc2c5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200381500000000002925801081008000810080020500640132120019200382003899776998980120200800322001600642003820038118020110099100100800001000000000111511801600200350800001002003920039200392003920039
80204200381500000000002961802081008000810080020500640132120019200382003899776998980120200800322001600642003820038118020110099100100800001000000000111511801600200350800001002003920039200392003920039
802042003815000000000027525801081008000810080020500640132120019200382003899776998980120200800322001600642003820038118020110099100100800001000000000111511801600200350800001002003920039200392003920039
802052003815000000000027925801081008000810080020500640132120019200382003899776998980120200800322001600642003820038118020110099100100800001000000000111511801600200350800001002003920039200392003920039
80204200381500000000002925801081008000810080020500640132120019200382003899776998980120200800322001600642003820038118020110099100100800001000000000111511801600200350800001002003920039200392003920039
8020420038150000000000379725801081008000810080020500640132120019200382003899776998980120200800322001600642003820038118020110099100100800001000000000111511801600200350800001002003920039200392003920039
80204200381500000000002950801081008000810080020500640132120019200382003899776998980120200800322001600642003820038118020110099100100800001000000000111511801600200350800001002003920039200392003920039
802042003815000000000015925801081008000810080020500640132120019200382003899776998980120200800322001600642003820038118020110099100100800001000000000111511801600200350800001002003920039200392003920039
802042003815000000000013825801081008000810080020500640132120019200382003899776998980120200800322001600642003820038118020110099100100800001000000000111511801600200350800001002003920039200392003920039
80204200381500000000004925801081008000810080020500640132120019200382003899776998980120200800322001600642003820038118020110099100100800001000000000111511801600200350800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03081e3f51inst 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)696d6edispatch 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)9fa1a8acc2branch mispredict (cb)cfd0d5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200401500013425800101080000108000050640000200192003820038999631001880010208000020160000200382003811800211091010800001000000502015516432003580000102003920039200392003920039
8002420038150003925800101080000108000050640000200192003820038999631001880010208000020160000200382003811800211091010800001000001502015416442003580000102003920039200392003920039
8002420038150003925800101080093108000050640000200192003820038999631001880010208000020160000200382003811800211091010800001000000502015316442003580000102003920039200392003920039
8002420038150003925800101080000108000050640000200192003820038999631001880010208000020160000200382003811800211091010800001000000502015416432003580000102003920039200392003920039
8002420038150003925800101080000108000050640000200192003820038999631001880010208000020160000200382003811800211091010800001000000502015316342003580000102003920039200392003920039
80024200381500040025800101080000108000050640000200192003820038999631001880010208000020160000200382003811800211091010800001000300502015316432003580000102003920039200392003920039
8002420038150003925800101080065108000050640000200192003820038999631001880010208000020160000200382003811800211091010800001000000502015416342003580000102003920039200392003920039
8002420088150006025800101080000108000050640000200192003820038999631001880010208000020160000200382003811800211091010800001000000502015416442003580000102003920039200392003920039
8002420038150003925800101080000108000050640000200192003820038999631001880010208000020160000200382003811800211091010800001000000502015316432003580000102003920039200392003920039
80024200381500010225800101080000108000050640000200192003820038999631001880010208000020160000200382003811800211091010800001000000502015416342003580000102003920039200392003920039