Apple M1 Microarchitecture Research by Dougall Johnson

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

CMGT (register, 2S)

Test 1: uops

Code:

  cmgt v0.2s, v0.2s, v1.2s
  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)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)a6a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
1004203715061168725100010001000264680120182037203715723189510001000200020372037111001100000073416221787100020382038203820382038
1004203716082168725100010001000264680120182037203715723189510001000200020372037111001100000073216221787100020382038203820382038
1004203715061168725100010001000264680120182037203715723189510001000200020372037111001100000073216221787100020382038203820382038
1004203716061168725100010001000264680120182037203715723189510001168200020372037111001100000073216221787100020382038203820382038
1004203715061168725100010001000264680120182037203715723189510001000200020372037111001100000073216221787100020382038203820382038
1004203716061168725100010001000264680120182037203715723189510001000200020372037111001100000073216221787100020382038203820382038
1004203715061168725100010001000264680120182037203715723189510001000200020372037111001100000073216221787100020382038203820382038
1004203715061168725100010001000264680120182037203715723189510001000200020372037111001100000073216221787100020382038203820382038
1004203715061168725100010001000264680120182037203715723189510001000200020372037111001100000073216221787100020382038203820382038
1004203715061168725100010001000264680120182037203715723189510001000200020372037111001100000073216221787100020382038203820382038

Test 2: Latency 1->2

Code:

  cmgt v0.2s, v0.2s, v1.2s
  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)03191e3f4e51inst 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)9fa0a6a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204200371500126119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100000127101161119791100001002003820038200382003820038
102042003715000611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010000007101161119791100001002003820038200382003820087
1020420037150039611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
1020420037150030611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
1020420037150033611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
1020420037150018611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
1020420037150012611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
10204200371500186611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
1020420037150015611968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200371110201100991001001000010000007101161119791100001002003820038200382003820038
10204200371500426821968725101001001000010010000500284768012001820037200371842231874510100200100002002000020037200841110201100991001001000010000007101161119791100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)03080b18191e1f3a3f4e51inst 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)9fa0a1a6a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1002420037150000033006119687251001010100001010000502847680200182003720037184443187671001020100002020000200372003711100211091010100001000000006404162219785010000102003820038200382003820038
100242003715000006006119687251001010100001010000502847680200182003720037184443187671001020100002020000200372003711100211091010100001000000006402162219785010000102003820038200382003820038
100242003715000000009419687251001010100001010000502847680200182003720037184443187671001020100002020000200852013111100211091010100001000000006402162219785010000102003820038200382003820038
100242003715010000006119687251001010100001010000502847680200182003720037184443187671001020100002020000200372003711100211091010100001000000006402162219785010000102003820038200382003820038
100242003715000000006119687251001010100001010000502847680200182003720037184443187671001020100002020000200372003711100211091010100001000000006402162219785010000102003820038200382003820038
100242003715000000006119687251001010100001010000502847680200182003720037184443187671001020100002020000200372003711100211091010100001000000006402162219785010000102003820038200382003820038
100242003715000000006119687251001010100001010000502847680200182003720037184443187671001020100002020000200372003711100211091010100001000000006692162219785010000102003820038200382003820038
10024200371500000216006119687251001010100001010000502847680200182003720037184453187671001020100002020000200372003711100211091010100001000000006402162219785010000102003820038200382003820038
1002420037150000015006119687251001010100001010000502847680200182003720037184443187671001020100002020000200372003711100211091010100001000000006402162219785010000102003820038200382003820038
100242003715000000009419687251001010100001010000502847680200182003720037184443187671001020100002020000200372003711100211091010100001000000006692162219785010000102003820038200382003820038

Test 3: Latency 1->3

Code:

  cmgt v0.2s, v1.2s, 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)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)9fa8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020420037150156119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
102042003715006119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100207101161119791100001002003820038200382003820038
102042003715006119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
102042003715006119687251010010210000100100005002847680120018200372003718436318745101002001000020020000200372003711102011009910010010000100007101161119791100001002008720038200382008620038
102042003715006119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
102042003715006119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
1020420037150276119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
102042003715006119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100007101161119791100001002003820038200852003820038
102042003715096119687251010010010000100100005002847680120018200372018218422318745101002001000020020000200372003711102011009910010010000100007101161119791100001002003820038200382003820038
1020420037150486119687251010010010000100100005002847680120018200372003718422318745101002001000020020000200372003711102011009910010010000100007101161119791100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)03081e3a3f4e51inst 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)9fa6a7a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100242003715005124421968725100101010000101000050284768002001820037200371844431876710010201000020200002003720037111002110910101000010000064410165101978510000102003820038200382003820038
100242003715004526219687251001010100001010000502847680120018200372003718444318767100102010000202000020037200371110021109101010000100000644111610101978510000102003820038200382003820038
1002420037150002621968725100101010000101000050284768002001820037200371844431876710010201000020200002003720037111002110910101000010000064410161161978510000102003820038200382003820038
100242003714900262196872510010101000010100005028476801200182003720037184443187671001020100002020000200372003711100211091010100001000006441016851978510000102003820038200382003820038
1002420037150002621968725100101010000101000050284768002001820037200371844431876710010201000020200002003720037111002110910101000010000064451610111978510000102003820038200382003820038
100242003715001826219687251001010100001010000502847680120018200372003718444318767100102010000202000020037200371110021109101010000100000644101610101978510000102003820038200382003820083
10024200371500026219687251001010100001010000502847680120018200372003718444318767100102010000202000020037200371110021109101010000100000644111611111978510000102003820038200382003820038
10024200371500626219687251001010100001010000502847680120018200372003718444318767100102010000202000020037200371110021109101010000100000644101610111978510000102003820038200382003820038
1002420037150002621968725100101010000101000050284768012001820037200371844431876710010201000020200002003720037111002110910101000010000064410165101978510000102003820038200382003820038
10024200371500626219687251001010100001010000502847680120018200372008418444318767100102010000202000020037200371110021109101010000100000644101610101978510000102003820038200382003820038

Test 4: throughput

Count: 8

Code:

  cmgt v0.2s, v8.2s, v9.2s
  cmgt v1.2s, v8.2s, v9.2s
  cmgt v2.2s, v8.2s, v9.2s
  cmgt v3.2s, v8.2s, v9.2s
  cmgt v4.2s, v8.2s, v9.2s
  cmgt v5.2s, v8.2s, v9.2s
  cmgt v6.2s, v8.2s, v9.2s
  cmgt v7.2s, v8.2s, v9.2s
  movi v8.16b, 9
  movi v9.16b, 10

(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)9fa0a1a8acbranch mispredict (cb)cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8020420060150000876125801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000000051103161120035800001002003920039200392003920039
802042003815000004025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000000051101162120035800001002003920039200392003920039
802042003815000004025801001008000010080000500640000020019200382003899733999680100200800002001602562003820038118020110099100100800001000000051101161120035800001002003920039200392003920039
802042003815000004025801001008000010080000500640000020019200382003899733999680100200800002001600002003820038118020110099100100800001000000051101161120035800001002003920039200392003920039
802042003815000004025801001008000010080000500640000020019200382003899733999680100200800002001600002003820038118020110099100100800001000000051101161120035800001002003920039200392003920039
802042003815001004025801001008000010080000500640000020019200382003899733999680100200800002001600002003820038118020110099100100800001002000051101161120035800001002003920039200392003920039
802042003815000004025801001008000010080000500640000020019200382003899733999680100200800002001600002003820038118020110099100100800001000000051101161120035800001002003920039200392003920039
802042003815000004025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000003051101161120035800001002003920039200392003920039
802042003815000004025801001008000010080000500640000120019200382003899733999680100200800002001600002003820038118020110099100100800001000000051101161120035800001002003920039200392003920039
802042003815000004025801001008000010080000500640000020019200382003899733999680100200800002001600002003820038118020110099100100800001000000051101161120035800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03090b1e3f51inst 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)5f60696d6edispatch 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
80024200471510008125800101080000108000050640000102001920038200389996310018800102080000201600002003820038118002110910108000010005020216112003580000102003920039200392003920039
80024200381500003925800101080000128009950640000012001920038200389996310018800102080000201600002003820038118002110910108000010005020116112003580000102003920039200392003920039
80024200381500003925800101080000108000050640000002001920038200389996310018800102080000201600002003820038118002110910108000010005020116112003580000102003920039200392003920039
80024200381500003925800101080000108000050640000002001920038200389996310018800102080000201600002003820038118002110910108000010005020116112003580000102003920039200392003920039
80024200381500003925800101080000108000050640000012001920038200389996310018800102080000201600002003820038118002110910108000010005020116112003580000102003920039200392003920039
800242003815000639258001010800001080000506400000020019200382003899963100188001020800002016000020038200381180021109101080000106005020116112003580000102003920039200392003920039
80024200381500003925800101080000108000050640000002001920038200979996310018800102080000201600002003820038118002110910108000010005020116112003580000102003920039200392003920039
80024200381500003925800101080000108000050640000002001920038200389996310018800102080000201600002003820038118002110910108000010005020116112003580000102003920039200392003920039
800242003815000273925800101080000108000050640000002001920038200389996310018800102080000201600002003820038118002110910108000010005020116112003580000102003920039200392003920039
80024200381500003925800101080000108000050640000002001920038200389996310018800102080000201600002003820038118002110910108000010005020116112003580000102003920039200392003920039