Apple M1 Microarchitecture Research by Dougall Johnson

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

FCMGE (scalar, zero, D)

Test 1: uops

Code:

  fcmge d0, d0, #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)03191e3f4e51inst 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)~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
1004203716006116862510001000100026452102018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203715006116862510001000100026452102018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203715006116862510001000100026452102018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
100420371501686116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203715006116862510001000100026452102018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203716006116862510001000100026452102018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203715036116862510001000100026452102018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203715006116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
10042037150126116862510001000100026452102018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203715006116862510001000100026452102018203720371571318951000100010002037203711100110000073116111786100020382038203820382038

Test 2: Latency 1->2

Code:

  fcmge d0, d0, #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)03181e3f4e51inst 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)9fa0a1a8accfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102042003715011566119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000071021611197910100001002003820038200382003820038
10204200371500126119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100001071011611197910100001002003820038200382003820038
1020420037150006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000371011611197910100001002003820038200382003820075
10204200371500188219686251010010010000100100005222847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000071011611197910100001002003820038200382003820038
10204200371500016619686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000071011611197910100001002003820038200382003820038
1020420037150006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000071011611197910100001002003820038200382003820038
10204200371500061196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000054071011611197910100001002003820038200382003820038
1020420037150006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000071011611197910100001002003820038200382003820038
1020420037150006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000071011611197910100001002003820038200382003820038
1020420037150006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000071011611197910100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)03070b1e3f4e51inst 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? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100242003715000345611968625100101010000101000060284752112001820037200371844331876710010201000020100002003720037111002110910101000010006402162219854010000102003820038200382003820038
10024200371500038428701968625100101010000101000050284752102001820037200371844331876710012201000020100002003720037111002110910101000010006402162219786010000102003820038200382003820038
1002420037150000611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010006402162619786010000102003820038200382003820038
10024200371500012611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010306402162219786010000102003820038200382003820038
100242003715000288611968625100101010000101000050284752102001820037200371844331876710012201000020100002003720037111002110910101000010006402162219786010000102003820038200382003820038
1002420037150000611968625100101010000101000050284752102001820037200371844331876710012201000020100002003720037111002110910101000010006402162219786010000102003820038200382003820038
10024200371500084611968625100121210000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010006402162219786010000102003820038200382003820038
10024200371500003461968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010006402162219786010000102003820038200382003820038
1002420037150000611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010006402162219786010000102003820038200382003820038
1002420037150000611968625100101010000101000050284752102001820037200371844331876710010201000020100002003720037111002110910101000010006402162219786010000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  fcmge d0, d8, #0
  fcmge d1, d8, #0
  fcmge d2, d8, #0
  fcmge d3, d8, #0
  fcmge d4, d8, #0
  fcmge d5, d8, #0
  fcmge d6, d8, #0
  fcmge d7, d8, #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)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)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)cdcfd6e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
802042004815003272925801081008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010000011151181620035800001002003920039200392003920039
80204200381500692925801081008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010000011151181620035800001002003920039200392003920039
8020420038150002925801081008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010000011151181620035800001002003920039200392003920039
802042003815004592925801081008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010000011151181620035800001002003920039200392003920039
802042003815003872925801081008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010000011151181620035800001002003920039200392003920039
802042003815003332925801081008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010000011151181620035800001002003920039200392003920039
8020420038150002925801081008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010000011151181620035800001002003920039200392003920039
8020420038150002925801801008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010000011151181620035800001002003920039200392003920039
802042003815003902925801081008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010000011151181620035800001002003920039200392003920039
802042003815004292925801081008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010000011151181620035800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03080b18191e1f3f51inst 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)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)9fa0a1a6a8a9acc2c5cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242003915000136724403925800101080095108048950643852020179020293202861003831004580498208047920804862034120284618002110910108000010202000005020216112003580000102003920039200392003920039
8002420038150000090392580010108000010800005064000002001902003820038999631001880010208000020800002003820038118002110910108000010000000005020116112003580000102003920039200392003920039
80024200381500000002272580010108000010800005064000002001902003820038999631001880010208000020800002003820038118002110910108000010000000005037116112003580000102003920039200392003920039
8002420038150000000392580010108000010800005064000002001902003820038999631001880010208000020800002003820038118002110910108000010003000005020116112003580000102003920039200392003920039
8002420038150000000392580010108000010800005064000002001902003820038999631001880010208000020800002003820038118002110910108000010000000005020116112003580000102003920039200392003920039
800242003814900001801232580010108000010801965064000002001902003820038999631001880010208000020800002003820038118002110910108000010000000005020116112003580000102003920039200392003920039
8002420038150000000392580010108000010800005064000002001902003820038999631001880010208000020800002003820038118002110910108000010000000005020116112003580000102003920039200392003920039
8002420038150000090392580010108000010800005064000002001902003820038999631001880010208000020800002003820038118002110910108000010000000205020116112003580000102003920039200392003920193
8002420038150000000392580010108000010800005064000002001902003820038999631001880010208000020800002003820038118002110910108000010000000005020227112003580000102003920039200912010020039
8002420089150000000392580010108000010800005064000002001902003820038999631001880010208000020800002003820038118002110910108000010000000005020216112003580000102003920039200392003920039