Apple M1 Microarchitecture Research by Dougall Johnson

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

RSUBHN (2D)

Test 1: uops

Code:

  rsubhn v0.2s, v0.2d, v1.2d
  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)a8cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
1004303722061254825100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
1004303723061254825100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
1004303723061254825100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037230330254825100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037231861254825100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
1004303722061254825100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
1004303722061254825100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
1004303722061254825100010001000398313301830373037241532895100010002000303730371110011000073124112630100030383038303830383038
1004303723061254825100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
1004303722961254825100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  rsubhn v0.2s, v0.2d, v1.2d
  movi v0.16b, 1
  movi v1.16b, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)0308090b181e3f4e51inst 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)9fa1a6a8acc2cdcfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102043003722500000612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038
102043003722400000612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038
102043003722500000612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038
102043003722500000612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038
102043003722500000612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038
102043003722500000612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038
102043003722500000612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038
102043003722400000612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038
10204300372250000014682954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038
102043003722500000612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)031e1f3f4e51inst 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)9fa0a1a6a7a8a9acbranch mispredict (cb)cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038
1002430037225006312954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038
100243003722400822954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830080300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  rsubhn v0.2s, v1.2d, 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): 3.0037

retire (01)cycle (02)03080b181e3f4e51inst 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)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)9fa8acc2cfd0d5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020430037224000061295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100000710011611296340100001003003830038300383003830038
1020430037224000061295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100000710011611296340100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100000710011611296340100001003003830038300383003830038
1020430037224000061295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100000710011611296340100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100000710011611296340100001003003830038300383003830038
1020430037224000061295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100000710011611296340100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100000710011611296340100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100000710011611296340100001003003830038300383003830038
1020430037225000961295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100000710011611296340100001003003830038300383003830038
10204300372250005761295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100000710011611296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)030b191e1f3a3f4e51inst 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)9fa8acc2c5cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024300372250000061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000006403162229630010000103003830038302273003830038
10024300372250000061295482510010101000810100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000206402162229630010000103003830038300383008530038
10024300372250000061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000006406162229630010000103003830038300383003830038
10024300372250000061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001066006402162229630210000103003830038300383003830038
10024300372250000061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000006402162229630310000103003830038300383003830038
10024300372250000061295484410020101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001010006402162229630010000103003830038300383003830038
1002430037225000264082295482510010101000010100005042813841300183003730037282873287671001020100002020000300373003711100211091010100001008228006402162229630010000103003830038300383003830038
1002430037225000005419295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000006402162229630010000103003830038300383003830038
10024300372240000061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000006402162229630010000103003830038300383003830038
10024300372250000061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000006402162229630010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  rsubhn v0.2s, v8.2d, v9.2d
  rsubhn v1.2s, v8.2d, v9.2d
  rsubhn v2.2s, v8.2d, v9.2d
  rsubhn v3.2s, v8.2d, v9.2d
  rsubhn v4.2s, v8.2d, v9.2d
  rsubhn v5.2s, v8.2d, v9.2d
  rsubhn v6.2s, v8.2d, v9.2d
  rsubhn v7.2s, v8.2d, v9.2d
  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)03091e1f3a3f51inst 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)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)9fa6a8accdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200391500002422580100100800001008000050064000002002020039200399973039997801002008000020016000020039200391180201100991001008000010000780511410167720036800001002004020040200402004020040
8020420039150000242258010010080000100800005006400000200202003920039997303999780100200800002001600002003920039118020110099100100800001000014405114101691020036800001002004020040200402004020040
802052003915000024225801001008000010080000500640000120020200392003999730399978010020080000200160000200392003911802011009910010080000100010051149169920036800001002004020040200402004020040
80204200391500210024225801001008000010080000500640000020020200392003999730399978010020080000200160000200392003911802011009910010080000100000051141016101020036800001002004020040200402004020040
8020420039150000242258010010080000100800005006400000200202003920039997303999780100200800002001600002003920039118020110099100100800001000099051141016101120036800001002004020040200402004020040
802042003915000024225801001008000010080000500640000020020200392003999730399978010020080000200160000200392003911802011009910010080000100009905114916111120036800001002004020040200402004020040
802042003915000024225801001008000010080000500640000020020200392003999730399978010020080000200160000200392003911802011009910010080000100006051149169920036800001002004020040200402004020040
802042003915000024225801001008000010080000500640000020020200392003999730399978010020080000200160000200392003911802011009910010080000100000051149169920036800001002004020040200402004020040
802042003915000024225801001008000010080000500640000020020200392003999730399978010020080000200160000200392003911802011009910010080000100000051149169920036800001002004020040200402004020040
802042003915000024225801001008000010080000500640000020020200392003999730399978010020080000200160000200392003911802011009910010080000100000051149169920036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)031e3f51inst 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)9fa1a8accficache miss (d3)d5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8002420039150040258001010800001080000506400000020020200392003999963100198001020800002016000020039200391180021109101080000100010550200116112003680000102004020040200402004020040
80024200391500402580010108000010800005064000001200202003920039999631001980010208000020160000200392003911800211091010800001000050200116112003680000102004020040200402004020040
80024200391500682580010108000010800005064000001200202003920039999631001980010208000020160000200392003911800211091010800001000050200116112003680000102004020040200402004020040
80024200391500402580302108000010800005064000001200202003920039999631001980010208000020160000200392003911800211091010800001000050200116112003680000102004020040200402004020040
80024200391503402580010108000010800005064000000200202003920039999631001980010208000020160000200392003911800211091010800001000050200116112003680000102004020040200402004020040
80024200391500402580010108000010800005064000001200202003920039999631001980010208000020160000200392003911800211091010800001000050200116112003680000102004020040200402004020040
80024200391500402580010108000010800005064000001200202003920039999631001980010208000020160000200392003911800211091010800001000050200116112003680000102004020040200402004020040
8002420039150040258001010800001080000506400000120020200392003999963100198001020800002016000020039200391180021109101080000100010250200116112003680000102004020040200402004020040
80024200391500402580010108000010800005064000001200202003920039999631001980010208000020160000200392003911800211091010800001000050200116112003680000102004020040200402004020040
80024200391500402580010108000010800005064000001200202003920039999631001980010208000020160000200392003911800211091010800001000050200116112003680000102004020040200402004020040