Apple M1 Microarchitecture Research by Dougall Johnson

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

CMEQ (zero, 4H)

Test 1: uops

Code:

  cmeq v0.4h, v0.4h, #0
  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)a6a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
100420371506116862510001000100026452120182037203715713189510001000100020372037111001100000073216221786100020382038203820382038
1004203715246116862510001000100026452120182037203715713189510001000100020372037111001100000073216221786100020382038203820382038
10042037153276116862510001000100026452120182037203715713189510001000100020372037111001100000073216221786100020382038203820382038
1004203716816116862510001000100026452120182037203715713189510001000100020372037111001100000073216221786100020382038203820382038
1004203715014516862510001000100026452120182037203715713189510001000100020372037111001100000073216221786100020382038203820382038
100420371506116862510001000100026452120182037203715713189510001000100020372037111001100000073216221786100020382038203820382038
1004203715010316862510001000100026452120182037203715713189510001000100020372037111001100000073216221786100020382038203820382038
100420371506116862510001000100026452120182037203715713189510001000100020372037111001100000073216221786100020382038203820382038
100420371506116862510001000100026452120182037203715713189510001000100020372037111001100000073216221786100020382038203820382038
100420371506116862510001000100026452120182037203715713189510001000100020372037111001100000073216221786100020382038203820382038

Test 2: Latency 1->2

Code:

  cmeq v0.4h, v0.4h, #0
  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)0308191e3f4e51inst 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
1020420037150003486119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
1020420037150003546119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
10204200371500006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
10204200371500006119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
1020420037150005076119686251010010010000100100005002847521020018200372003718421318745101002001000020410000200372008411102011009910010010000100007101161119791100001002003820038200382003820038
10204200371500006119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
102042003715000636119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
102042003715000666119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
102042003715000516119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
10204200371500008219686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100007101161119791100001002003820038200382003820038

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)9fa8a9accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024200371500611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000640316431978610000102003820038200382003820038
10024200851500611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000640316331978610000102003820038200382003820038
10024200371500611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010000640316331978610000102003820038200382003820038
1002420037149297611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010000640316331978610000102003820038200382003820038
10024200371500611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010000640316331978610000102003820038200382003820038
10024200371500611968625100101010000101000050284752112001820037200371844331876710165201000020100002003720037111002110910101000010000640316331978610000102003820038200382003820038
10024200371500611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010000640316331978610000102003820038200382003820038
10024200371500611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010000640316331978610000102003820038200382003820038
10024200371500611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010100640316331978610000102003820038200382003820038
1002420037150279611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010000640316331978610000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  cmeq v0.4h, v8.4h, #0
  cmeq v1.4h, v8.4h, #0
  cmeq v2.4h, v8.4h, #0
  cmeq v3.4h, v8.4h, #0
  cmeq v4.4h, v8.4h, #0
  cmeq v5.4h, v8.4h, #0
  cmeq v6.4h, v8.4h, #0
  cmeq v7.4h, v8.4h, #0
  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)030b18191e3f51inst 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)9fa6a8acc5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200381500002729258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100000111511801600200350800001002003920039200392003920039
80204200381500000124258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100210111511801600200350800001002003920039200392003920039
80204200381501000926258010810080104100800205006409081200192003820038997769989801202008003220080032200382003811802011009910010080000100003111511801600200350800001002003920039201482009820039
80204200381500111829258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100000111511801600200350800001002003920039200392003920039
8020420038150000029258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100000111511801600200350800001002003920039200392003920039
8020420038150000071258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100000111513501600200350800001002003920139200392003920090
80204200381510001229258021010080008100800205006401321200192003820100997769989801202008003220080032200382003811802011009910010080000100010111511801600200350800001002003920039200392003920039
8020420038150000029258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100000111511801600200350800001002003920039200392003920039
8020420038150000071258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100010111511801600200350800001002003920039200392003920039
8020420038150000029258010810080008100800205006401321200192003820038997769989801202008003220080032200382003811802011009910010080000100000111511801603200350800001002003920039200392003920039

1000 unrolls and 10 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)60696b6d6edispatch 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)9fa0a1a6a8a9accfd5d6ddinst fetch restart (de)e0? int output thing (e9)eb? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200501500000001500392580010108000010800005064000002001902003820038999603100188001020800002080000200382003811800211091010800001000000050201716166200350080000102003920039200392003920039
80024200381500000002400392580010108000010800005064000002001902003820038999603100188001020800002080000200382003811800211091010800001000000050201616166200350080000102003920039200392003920039
80024200381500000001800392580010108000010800005064000002001902003820038999602110018800102080000208000020038200381180021109101080000100000005020616616200350080000102003920039200392003920039
8002420038150000000000392580010108000010800005064000002001902003820038999603100188001020800002080000200382003811800211091010800001000000050201616616200350080000102003920039200392003920039
8002420038150000000000392580010108000010800005064000002001902003820038999603100188001020800002080000200382003811800211091010800001000000050201616166200350080000102003920039200392003920039
800242003815000000000010062580010108000010800005064000002001902003820038999603100188001020800002080000200382003811800211091010800001000000050201616136200350080000102003920039200392003920039
800242003815000000000039258001010800001080000506400000200190200382003899960310018800102080000208000020038200381180021109101080000100000005020616616200350080000102003920039200392003920039
80024200381500000004800926258001010800001080000506400000200190200382003899960310018800102080000208000020038200381180021109101080000100000035020616616200350080000102003920039200392003920039
80024200381500000002400392580010108000010800005064000002001902003820038999603100188001020800002080000200382003811800211091010800001000000050201616616200350080000102003920039200392003920039
8002420038150000000000392580010108000010800005064000002001902003820038999603100188001020800002080000200382003811800211091010800001000000050206161616200350080000102003920039200392003920039