Apple M1 Microarchitecture Research by Dougall Johnson

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

UABD (vector, 2S)

Test 1: uops

Code:

  uabd 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)0308091e3f4e51inst 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
100430372300061254825100010001000398313130183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
100430372200061254825100010001000398313030183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
100430372300061254825100010001000398313130183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
100430372300061254825100010001149398313030183037303724153289510001000200030373037111001100002373216222630100030383038303830383038
1004303723001261254825100010001000398313030183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
100430372200061254825100010001000398313030183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
100430372300061254825100010001000398313030183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
100430372300061254825100010001000398313030183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
1004303723011261254825100010001000398313030183037303724153289510001000200030373037111001100000073216222630100030383038303830383038
100430372200061254825100010001000398313130183037303724153289510001000200030373037111001100000073216222630100030383038303830383038

Test 2: Latency 1->2

Code:

  uabd 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): 3.0037

retire (01)cycle (02)03080918191e1f3a3f4e51inst 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)9fa0a1a6a7a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020430037225000000061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000000071011611296340100001003003830038300383003830038
10204300372250000121760103295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001002000000071011611296340100001003003830038300383003830038
1020430037225000000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000100071011611296340100001003003830038300383003830038
1020430037225000000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000000071011611296340100001003003830038300383003830038
1020430037225000000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000000071011611296340100001003003830038300383003830038
1020430037225000000061295482510132107100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000000071011611296340100001003003830038300383003830038
1020430037225000000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000000071011611296340100001003003830038300383003830038
1020430037225000000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000000071011611296340100001003003830038300383003830038
1020430037225000000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000000071011611296340100001003003830038300383003830038
1020430037225000000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000020200071011611296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)0307090a0b18191e1f3a3f4e51inst 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
10024300372250000000006129548251001012100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000010006407162229630010000103003830038300383003830038
10024300372250000000006129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000000006402162629630010000103003830038300383003830038
10024300372240000010006129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000010606402162229630010000103003830038300383003830038
10024300372250000000006129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000000006402162229630010000103003830038300383003830038
10024300372240000000006129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000000006402162229630010000103003830038300383003830038
10024300372250000000006129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000210006402162229630010000103003830038300383003830038
1002430037225000000010406129548251001012100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001020000006422162229630010000103003830038300383003830038
10024300372250000000007092947463100801510056171108360428157930342304143016728315422891710905221129922206623041530416811002110910101000010105102482848125645629726310000103046430419304653041830416
1002430402228010084119170403947294671101008814100801611192724288169303423046230450283242928916112072410485262262830465304619110021109101010000100220422418082951059429954310000103032030319304523041930414
1002430412228000188118870405766294671971008513100721211341764285455302343008430368283092928805104632211134202163230272303673110021109101010000102221016605077236481029881410000103032530368301823032130358

Test 3: Latency 1->3

Code:

  uabd 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): 3.0037

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)9fa0a8acc2cfd0d5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204300372250145295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710011611296340100001003003830038300383003830038
10204300372250170295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710011611296350100001003003830038300853003830038
10204300372250187295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710011611296340100001003003830038300383003830038
10204300372250145295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710011611296340100001003003830038300383003830038
10204300372250215295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710011611296340100001003003830038300383003830038
10204300372250124295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710011611296340100001003003830038300383003830038
10204300372250212295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710011611296340100001003003830038300383003830038
10204300372250189295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710011611296340100001003003830038300383003830038
10204300372250174295482510100100100001001000050042773131300183003730037282653287451025920010000200200003003730037111020110099100100100001000000710011611296340100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710011611296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)0308090a0b18191e1f3a3f4e51inst 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)9fa0a1a6a7a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)ea? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100243003722400000000057129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000000064021622296300010000103003830038300383003830038
100243003722500000000016629548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000000064021622296300010000103003830038300383003830038
100243003722500000000012329548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000000064021622296300010000103003830038300383003830038
100243003722500000015006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000000064021622296300010000103003830038300383003830038
100243003722500000000016829548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000000064021622296300010000103003830038300383003830038
100243003722500000000012429548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000000064021622296300010000103003830038300383003830038
100243003722500000000012429548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000000064021622296300010000103003830038300383003830038
100243003722500000000012429548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000000064021622296300010000103003830038300383003830038
100243003722500000000010329548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000000064021622296300010000103003830038300383003830038
100243003722500000000014729548251001010100001010000504277313030018300373008428287328767100102010000202000030037300371110021109101010000100000000064021622296300010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  uabd v0.2s, v8.2s, v9.2s
  uabd v1.2s, v8.2s, v9.2s
  uabd v2.2s, v8.2s, v9.2s
  uabd v3.2s, v8.2s, v9.2s
  uabd v4.2s, v8.2s, v9.2s
  uabd v5.2s, v8.2s, v9.2s
  uabd v6.2s, v8.2s, v9.2s
  uabd 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)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)9fa7a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200581500083258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000051102161120036800001002004020040200402004020040
80204200391500041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000051101161120036800001002004020040200402004020040
80204200391500064258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000051101161120036800001002004020040200402004020040
80204200391500041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010001051101161120036800001002004020040200402004020040
80204200391500083258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000051101161120036800001002004020040200402004020040
80204200391500062258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000051101161120036800001002004020040200402004020040
80204200391500041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000051101161120036800001002004020040200402004020040
80204200391500041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000051101161120036800001002004020040200402004020040
802042003915000146258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010001351101161120036800001002004020040200402004020040
80204200391500041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000051101161120036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03080b18191e1f3f51inst 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)9fa0a1a6a8a9acc2cfd5d6daddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242004815000000040258001010800001080000506400000020020200392003999963100198001020800002016000020039200391180021109101080000100000000502021602220036080000102004020040200402004020040
800242003915000000040258001012800001080000506400000020020200392003999963100198001220800002016000020039200391180021109101080000100000000502021615320036280000102004020040200402004020040
800242003915000000040258001012800001080000506400000020020200392003999963100198001020800002016000020039200391180021109101080000100000000502021602220036080000102004020040200402004020040
800242003915000000040258001010800001080000506400000020020200392003999963100198001020800002016000020039200391180021109101080000100000000502021602220036280000102004020040200402004020040
800242003915000000040258001010800001080000506400000120020200392003999963100198001020800002016000020039200391180021109101080000100001000502021602220036080000102004020040200402004020040
8002420039150000000107258001010800001080000506400000020020200392003999963100198001020800002016000020039200391180021109101080000100000000502021602220036280000102004020040200402004020040
800242003915000000040258001010800001080000506400000020020200392003999963100198001020800002016000020039200391180021109101080000100000000502021602220036280000102004020040200402004020040
80024200391500000001190258001010800001080000506400000020020200392003999963100198001020800002016000020039200391180021109101080000100000000502021602220036080000102004020040200402004020040
800242003915000000040258001010800001080000506400000020020200392003999963100198001020800002016000020039200391180021109101080000100000000502021602220036080000102004020040200402004020040
800242003915000000040258001010800001080000506400000020020200392003999963100198001020800002016000020039200391180021109101080000100000000502021602220036280000102004020040200402004020040