Apple M1 Microarchitecture Research by Dougall Johnson

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

SQDMULH (by element, 2S)

Test 1: uops

Code:

  sqdmulh v0.2s, v0.2s, v1.s[1]
  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)accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
100430372301962548251000100010003983130301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037230612548251000100010003983130301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037230612548251000100010003983130301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037230612548251000100010003983130301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037220612548251000100010003983130301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
100430372342612548251000100010003983130301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037230612548251000100010003983130301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037220612548251000100010003983130301830373037241532895100010002000303730371110011000973116112630100030383038303830383038
100430372201722548251000100010003983130301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
100430372301472548251000100010003983130301830373037241532895100010002000303730371110011000073116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  sqdmulh v0.2s, v0.2s, v1.s[1]
  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)030b191e1f3f4e51inst 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)9fa6a8a9acc2cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102043003722500210612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100000007102162229634100001003003830038300383003830038
102043003722500120612954825101001001000010010000527427731330090300373003728265328745101002001000020020000300373003711102011009910010010000100000007102162229634100001003003830038300383003830038
10204300372250060612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100000007102162229634100001003003830038300383003830038
10204300372240000612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100000007102162229634100001003003830038300383003830038
1020430037225004980612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100000007102162229634100001003003830038300383003830038
1020430037225001201562954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100000007102162229634100001003003830038300383003830038
102043003722500120612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100010007102162229634100001003003830038300383003830038
102043003722500301032954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100000028002162229670100001003003830038300383003830038
1020430037224001080612954825101001001000010010000622427731330018300373013228265328745101002001000020020000300373003711102011009910010010000100000007102162229634100001003003830038300383003830038
10204300372250090612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100000007102162229634100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)03080b18191e1f3f4e51inst 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)9fa0a1a6a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100243003722500000061295482510010101000010100005042773130300183003730037282923287671001020100002020000300373003711100211091010100001000000006402162229630010000103003830038300383003830038
100243003722500000061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100221091010100001000000006402162229630010000103003830038300383003830038
100243003722500000061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000000006402162229630010000103003830038300383003830038
100243003722500000061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000000006402162229630010000103003830038300383003830038
100243003722500000061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000000006402162229630010000103003830038300383003830038
100243003722500000061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000000006402162229630010000103003830038300383003830038
100243003722500000061295482510010101000010100006042773130300183003730037282873287671001020100002020000300373003711100211091010100001000000006402162229630010000103003830038300383003830038
10024300372250000474061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000000006402162229630010000103003830038300383003830038
100243003722500000061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000000006402162229630010000103003830038300383003830038
100243003722500000061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000000006402162229630010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  sqdmulh v0.2s, v1.2s, v0.s[1]
  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)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)9fa8acc5branch mispredict (cb)cfd5d6ddinst fetch restart (de)e0? int output thing (e9)ea? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204300372250061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710116112963402100001003003830038300383003830038
10204300372240061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710116112963400100001003003830038300383003830038
10204300372250061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710116112963400100001003003830038300383003830038
1020430037225028861295482510100109100081001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710116112963400100001003003830038300383003830038
10204300372240061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710116112963400100001003003830038300383003830038
10204300372250061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710116112963400100001003003830038300383003830038
10204300372250061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710116112963400100001003003830038300383003830038
10204300372250061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710116112963400100001003003830038300383003830038
10204300372250061295482510137100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710116112963400100001003003830038300383003830038
10204300372250061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710116112963400100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)03191e1f3f4e51inst 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
1002430037225039061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373008411100211091010100001000640316332963010000103003830038300383003830038
100243003722400061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000640316332963010000103003830038300383003830038
10024300372250360061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640316332963010000103003830038300383003830038
100243003722500061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000640316332963010000103003830038300383003830038
1002430037225000251295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640316332963010000103003830038300383003830038
1002430037225015061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000640316332963010000103003830038300383003830038
10024300372250006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100156640316332963010000103003830038300383003830038
1002430037225030061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000640316332963010000103003830038300383003830038
100243003722400061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640316332963010000103003830038300383003830038
100243003722500061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640316332963010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  sqdmulh v0.2s, v8.2s, v9.s[1]
  sqdmulh v1.2s, v8.2s, v9.s[1]
  sqdmulh v2.2s, v8.2s, v9.s[1]
  sqdmulh v3.2s, v8.2s, v9.s[1]
  sqdmulh v4.2s, v8.2s, v9.s[1]
  sqdmulh v5.2s, v8.2s, v9.s[1]
  sqdmulh v6.2s, v8.2s, v9.s[1]
  sqdmulh v7.2s, v8.2s, v9.s[1]
  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)9fa6a8c2cfd0d5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
802042003915000101812580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000511052161120036800001002004020040200402004020040
80204200391500000412580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000511001161120036800001002004020040200402004020040
80204200391500000412580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000511001161120036800001002004020040200402004020040
80204200391500000412580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000511001161120036800001002004020040200402004020040
80204200391500000412580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000511001161120036800001002004020040200402004020040
80204200391500000412580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000511001161120036800001002004020040200402004020040
80204200391500000412580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000511001161120036800001002004020040200402004020040
80204200391500000412580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000511001161120036800001002004020040200402004020040
80204200391500000412580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000511051161120036800001002004020040200902004020040
802042003915000004125801001008000010080000500640000020020200392003999737100228021720080105200160000200392014121802011009910010080000100000511001161120036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)030b191e1f3a3f51inst 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)9fa8accdcficache miss (d3)d5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242004815000300402580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010000502005165820036080000102004020040200402004020040
800242003915000000402580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010000502006167720036080000102004020040200402004020040
800242003915000000402580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010000502006166520036080000102004020040200402004020040
800242003915000000402580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010000502005166620036080000102004020040200402004020040
8002420039150001531760402580010108000010800005064000012002020039200399996310019800102080000201600002003920114118002110910108000010000502006166520036080000102004020040200402004020040
800242003915000000402580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010000502006165620036080000102004020040200402004020040
8002420039150000002302580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010000502005166520036080000102004020040200402004020040
8002420039150004200402580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010000502007168820036080000102004020040200402004020040
800242003914900000402580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010000502008167820036080000102004020040200402004020040
80024200391500013800402580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010000502008165520036080000102004020040200402004020040