Apple M1 Microarchitecture Research by Dougall Johnson

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

FRINTX (scalar, D)

Test 1: uops

Code:

  frintx d0, d0
  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)0308181e3f4e51inst 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)a1a8acc2cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
1004303722000822547251000100010003981600301830373037241432895100010001000303730371110011000003073116112629100030383038303830383038
1004303722000612547251000100010003981600301830373037241432895100010001000303730371110011000000073116112629100030383038303830383038
10043037220001032547251000100010003981600301830373037241432895100010001000303730371110011000013073116112629100030383038303830383038
1004303722000612547251000100010003981600301830373037241432895100010001000303730371110011000013073116112629100030383038303830383038
1004303723000612547251000100010003981601301830373037241432895100010001000303730371110011000000073116112629100030383038303830383038
10043037230001032547251000100010003981600301830373037241432895100010001000303730371110011000000073116112629100030383038303830383038
1004303722009612547251000100010003981600301830373037241432895100010001000303730371110011000412633295124112629100030383038303830863074
1004303722100612538251000100010003981601301830373037241432895100010001000303730371110011000000073116112629100030383038303830383038
1004303723009612547251000100010003981601301830373037241432895100010001000303730371110011000000073116112629100030383038303830383038
1004303723000612547251000100010003981601301830373037241432895100010001000303730371110011000013073116112629100030383038303830383038

Test 2: Latency 1->2

Code:

  frintx d0, d0
  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)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)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)9fa0a1a6a8a9acc2cfd0d5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204300372250000000612954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010000018000710011611296330100001003003830038300383003830038
1020430037225000000061295472510100100100001001000050042771601300183003730037282643287451010020010000200100003003730037111020110099100100100001000000060710011611296330100001003003830038300383003830038
1020430037225000000061295472510100100100001001000050042771601300183003730037282643287451010020010000200100003003730037111020110099100100100001000000000710011611296330100001003003830038300383003830038
1020430037225000000061295472510100100100001001000050042771601300183003730037282643287451010020010000200100003003730037111020110099100100100001000000000710011611296330100001003003830038300383003830038
10204300372250000000612954725101001001000010010000500427716013005430037300372826432874510100200100002001000030037300371110201100991001001000010000023000710011611296330100001003003830038300383003830038
1020430037225000000061295472510100100100001001000050042771601300183003730037282643287451010020010000200100003003730037111020110099100100100001000000000710011611296330100001003003830038300383003830038
1020430037225000000061295472510100100100001001000050042771601300183003730037282643287451010020010000200100003003730037111020110099100100100001000000000710011611296330100001003003830038300383003830038
10204300372250000000612954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010000040030710011611296330100001003003830038300383003830038
10204300372250000000612954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010000000028480172322985527100001003037030369304053037430369
102043037322700778012640455829492159102021371005614111050683428662413023430327303702828533288571119322411160222110833037130322811020110099100100100001004222721956108720256212990330100001003037230371302273037330377

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)030b18191e1f3a3f4e51inst 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)9fa0a6a7a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024300372250001200103295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000010306406162229629010000103003830038300383003830038
1002430037225000120061295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000010006402162229629010000103003830038300383003830038
100243003722500030061295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
10024300372240001200103295472510010101000010100005042771601300183008430037282903287671001020100002010000300373003711100211091010100001000000306402162229629010000103003830038300383003830038
1002430037225000300103295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000306402162229629010000103003830038300383003830038
10024300372250001200103295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
10024300372250001200103295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000010306402162229629010000103003830038300383003830038
1002430037225000000103295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000030306402162229629010000103003830038300383003830038
10024300372250001200103295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000010306402162229629010000103003830038300383003830038
10024300372250001200103295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000010306402162229629010000103003830038300863003830038

Test 3: throughput

Count: 8

Code:

  frintx d0, d8
  frintx d1, d8
  frintx d2, d8
  frintx d3, d8
  frintx d4, d8
  frintx d5, d8
  frintx d6, d8
  frintx d7, d8
  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)0308090b18191e3f51inst 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)9fa0a1a7a8a9acc2c5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8020420058150000001569525801081008000810080020500640132200202003920039997769990801202008003220080032200392003911802011009910010080000100000000011151180160020036800001002004020040200402004020040
802042003915000001127225801081008000810080020500640132200202003920039997769990801202008003220080032200392003911802011009910010080000100200103011151180160020036800001002004020040200402004020040
802042003915000000123025801081008000810080020500640132200202003920039997769990801202008003220080032200392003911802011009910010080000100000103011151180160020036800001002004020040200402004020040
8020420039150000004057225801081008000810080020500640132200202003920039997769990801202008003220080032200392003911802011009910010080000100000103011151180160020036800001002004020040200402004020040
802042003915000020127225801081008000810080020500640132200202003920039997769990801202008003220080032200392003911802011009910010080000100000203011151180160020036800001002004020040200402004020145
8020420039150000001270925801081008000810080020500640132201422003920039997769990801202008003220080032200392003911802011009910010080000100000003011151690160020036800001002004020040200402004020040
80204200391500000007225801081008000810080020500640132200202003920039997769990801202008003220080032200392003911802011009910010080000100000003011151180160020036800001002004020040200402004020040
80204200391500000097225801081008000810080341500640132200202003920039997769990801202008003220080032200392003911802011009910010080000100000103011151181340020036800001002004020040200402004020040
802042003915000000123025801081008000810080020500640132200202003920039997769990801202008003220080032200392003911802011009910010080000100000103011151180160020036800001002004020040200402004020040
802042003915000000127225801081008000810080020500640132200202003920039997769990801202008003220080032200392003911802011009910010080000100000103011151180210020036800001002004020040200402014320040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)031e1f3f51inst 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)9fa0a6a8cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200391501202122580010108000010800005064000002002020039200399996310019800102080000208000020039200391180021109101080000100005020616652003680000102004020040200402004020040
80024200391501207772580010108000010800005064000002002020039200399996310019800102080000208000020039200391180021109101080000100015020616652003680000102004020040200402004020040
800242003915000402580010108000010800005064000002002020039200399996310019800102080000208000020039200391180021109101080000100005020816652003680000102004020040200402004020040
80024200391500011132580010108000010800005064000002002020039200399996310019800102080000208000020039200391180021109101080000100005020616652003680000102004020040200402004020040
8002420039150002732580010108000010800005064000002002020039200399996310019800102080143208000020039200391180021109101080000100005020516562003680000102004020040200402004020040
800242003915000612580010108000010800005064000012002020039200399996310019800102080000208000020039200391180021109101080000100005020616652003680000102004020040200402004020040
8002420039150007782580010108000010800005064000012002020039200399996310019800102080000208000020039200391180021109101080000100005020616652003680000102004020040200402004020040
8002420039150008072580010108000010800005064000012002020039200399996310019800102080000208000020039200391180021109101080000100005020616672003680000102004020040200402004020040
8002420039155008872580010108000010800005064000002002020039200399996310019800102080000208000020039200391180021109101080000100005020816562003680000102004020040200402004020040
8002420039150007462580010108000010800005064000002002020039200399996310019800102080000208000020039200391180021109101080000100005020716562003680000102004020040200402004020040