Apple Microarchitecture Research by Dougall Johnson

M1/A14 P-core (Firestorm): Overview | Base Instructions | SIMD and FP Instructions
M1/A14 E-core (Icestorm):  Overview | Base Instructions | SIMD and FP Instructions

FCMGT (vector, zero, 8H)

Test 1: uops

Code:

  fcmgt v0.8h, v0.8h, #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 uop (01)cycle (02)03191e1f3f4e51schedule uop (52)schedule simd uop (54)dispatch simd uop (57)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map simd uop (7e)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst simd alu (9a)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
10042037150006116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
10042037160006116862510001000100026452102018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
10042037160006116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
10042037150006116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
10042037150006116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
1004203715012061168625100010001000264521120182037203715713189510001000100020372037111001100002473116111786100020382038203820382038
10042037160006116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
10042037160006116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
10042037150006116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038
10042037150306116862510001000100026452112018203720371571318951000100010002037203711100110000073116111786100020382038203820382038

Test 2: Latency 1->2

Code:

  fcmgt v0.8h, v0.8h, #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 uop (01)cycle (02)031e3f4e51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d tlb access (a0)ld unit uop (a6)st unit uop (a7)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
1020420037150126119675251010010010000126100005002848785020018200372003718424318762101002061000020010165200372003711102011009910010010000100000220507101251119824100001002003820038200382003820038
1020420037150126119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000107101161119791100001002003820038200382003820038
1020420037150012419686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
1020420037150010319686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
10204200371501261196862510100100100001001000050028475211200182003720037184213187451010020010000200100002003720037111020110099100100100001000003007101161119791100001002008620038200382003820038
102042003715006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
102042003715006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
102042003715006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
102042003715006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000107101161119791100001002003820038200382003820038
102042003715006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000107101161119791100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire uop (01)cycle (02)031e3f4e51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696b6d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fld unit uop (a6)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
100242003715006119686251001010100001010000502847521020018020037200371844331876710010201000020100002003720037111002110910101000010000640216221978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521020018020037200371844331876710010201000020100002003720037111002110910101000010203640216221978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521020018020037200371844331876710010201000020100002003720037111002110910101000010003640216221978610000102003820038200382003820038
1002420037150061196862510010101000010100005028475211200180200372003718443318767100102010000201000020037200371110021109101010000100015640216221978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521120018020037200371844331876710010201000020100002003720037111002110910101000010003640216221978610000102003820038200382003820038
1002420037150516119686251001010100001010000502847521020018020037200371844331876710010201000020100002003720037111002110910101000010000640216221978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521020018020037200371844331876710010201000020100002003720037111002110910101000010000640216221978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521020018020037200371844331876710010201000020100002003720037111002110910101000010003640216221978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521120018020037200371844331876710010201000020100002003720037111002110910101000010000640216221978610000102003820038200382003820038
100242003715006119686251001010100001010000502847521020018020037200371844331876710010201000020100002003720037111002110910101000010000640216221978610000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  fcmgt v0.8h, v8.8h, #0
  fcmgt v1.8h, v8.8h, #0
  fcmgt v2.8h, v8.8h, #0
  fcmgt v3.8h, v8.8h, #0
  fcmgt v4.8h, v8.8h, #0
  fcmgt v5.8h, v8.8h, #0
  fcmgt v6.8h, v8.8h, #0
  fcmgt v7.8h, v8.8h, #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 uop (01)cycle (02)03191e1f3f51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fst unit uop (a7)l1d cache writeback (a8)a9acbranch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)dde0? simd retires (ee)? int retires (ef)f5f6f7f8fd
802042004815000010225801081008000810080020500640132020019200382003899776998980120200800322008003220038200381180201100991001008000010000001115118116020035800001002003920039200392003920039
80204200381500305225801081008000810080020500640132020019200382003899776998980120200800322008003220038200381180201100991001008000010000001115118016020035800001002003920039200392003920039
80204200381500009425801081008000810080020500640132020019200382003899776998980120200800322008003220038200381180201100991001008000010003061115118016120035800001002003920039200392003920039
802042003815000011525801081008000810080020500640132020019200382003899776998980120200800322008003220038200381180201100991001008000010000001115118016020035800001002003920039200392003920039
80204200381500009225801081008000810080020500640132020019200382003899776998980120200800322008003220038200381180201100991001008000010000001115118016020035800001002003920039200392003920039
802042003815000051025801081008000810080020500640132020019200382003899776998980120200800322008003220038200381180201100991001008000010000231115118016020035800001002003920039200392003920039
80204200381500002925801081008000810080020500640132120019200382003899776998980120200800322008023120099200381180201100991001008000010000001115118016020035800001002003920039200392003920039
8020420038150013202925801081008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010000001115118016020035800001002003920039200392003920039
802042003815001202925801081008000810080020500640132120019200382003899776998980120200800322008003220038200381180201100991001008000010000001115118016020035800001002003920039200392003920039
8020420038150000712580108100800081008002050064013212001920038200389977699898012020080032200800322009020038118020110099100100800001002202501115118025020035800001002015020039200392003920039

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03l1i tlb fill (04)1e1f3f51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fld unit uop (a6)l1d cache writeback (a8)accfd5map dispatch bubble (d6)d9ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
80024200511501003925800101080000108000050640000020019200382003899963100188001020800002080000200382003811800211091010800001000050202716016252003580000102003920039200392003920039
800242003815000010925800101080000108000050640000120019200382003899963100188001020800002080000200382003811800211091010800001000050202516013232003580000102003920039200392003920039
800242003815000051425800101080000108000050640000120019200382003899963100188001020800002080000200382003811800211091010800001000050202516015262003580000102003920039200392003920039
80024200381500006452580010108000010800005064000012001920038200389996310018800102080000208000020038200381180021109101080000100094350202416025252003580000102003920039200392003920039
80024200381500003925800101080000108000050640000120019200382003899963100188001020800002080000200382003811800211091010800001001350202816028272003580000102003920039200392003920039
80024200381500003925800101080000108000050640000120019200382003899963100188001020800002080000200382003811800211091010800001000050202816027262003580000102003920039200392003920039
800242003815000069725800101080000108000050640000120019200382003899963100188001020800002080000200382003811800211091010800001000050201816023202003580000102003920039200392003920039
800242003815000039258001010800001080000506400001200192003820038999613100188001020800002080000200382013721800211091010800001030050202816027272003580000102018920039200392003920039
800242003815002403925800101080000108000050640000120019200382003899963100188001020800002080000200382003811800211091010800001001050202716026262003580000102003920039200392003920039
800242003815001203925800101080000108000050640000120019200382003899963100188001020800982080293201392003811800211091010800001001050202716015262003580000102003920039200392003920039