Apple M1 Microarchitecture Research by Dougall Johnson

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

USHR (vector, D)

Test 1: uops

Code:

  ushr d0, d0, #3
  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)030b191e3f4e51inst issue (52)~issue fp/simd (54)~dispatch fp/simd (57)huge thing fp/simd (5b)6061696d6edispatch 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)a8accfd0d5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
1004203715000611686251000100010002645210020182037203715713189510001000100020372037111001100000730116111786100020382038203820382038
1004203716000611686251000100010002645210520182037203715713189510001000100020372037111001100000730116111786100020382038203820382038
1004203716000611686251000100010002645210020182037203715713189510001000100020372037111001100010730116111786100020382038203820382038
1004203715000611686251000100010002645210020182037203715713189510001000100020372037111001100000730116111786100020382038203820382038
10042037160012611686251000100010002645211020182037203715713189510001000100020372037111001100000730116111837100020382038203820382038
1004203715000611686251000100010002645210020182037203715713189510001000100020372037111001100003730116111786100020382038203820382038
1004203715000611686251000100010002645210020182037203715713189510001000100020372037111001100000735116111786100020382038203820382038
1004203716000611686251000100010002645210020182037203715713189510001000100020372037111001100000730116111786100020382038203820382038
1004203715000611686251000100010002645210020182037203715713189510001000100020372037111001100003730116111786100020382038203820382038
1004203716000611686251000100010002645210020182037203715713189510001000100020372037111001100000730116111786100020382038203820382038

Test 2: Latency 1->2

Code:

  ushr d0, d0, #3
  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)9fa0a1a6a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102042003715506119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
102042003715506119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
102042003715506119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
102042003715506119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
1020420037155010319686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
102042003715606119686251010010010000100100005002847521020018200372003718355318745101002001000020010000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
102042003715506119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
102042003715506119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
102042003715506119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038
102042003715506119686251010010010000100100005002847521020018200372003718421318745101002001000020010000200372003711102011009910010010000100000007101161119791100001002003820038200382003820038

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0037

retire (01)cycle (02)030a1e3f4e51inst 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)9fa8acc5cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1002420037155206119686251001010100001010000502847521120018200372003718443031876710010201000020100002003720037111002110910101000010000640316331978610000102003820038200382003820038
10024200371552053619686251001010100001010000502847521020018200372003718443031876710010201000020100002003720037111002110910101000010000640316331978610000102003820038200382003820038
1002420037155006119686251001010100001010000502847521020018200372003718443031876710010201000020100002003720037111002110910101000010000640316331978610000102003820038200382003820038
1002420037155206119686251001010100001010000502847521020018200372003718443031876710010201000020100002003720037111002110910101000010000640316331978610000102003820038200382003820038
10024200371552010319686251001010100001010000502847521020018200372003718443031876710010201000020100002003720037111002110910101000010000640316331978610000102003820038200382003820038
10024200371622098519686251001010100001010000502847521120018200372003718443031876710010201000020100002003720037111002110910101000010000640316331978610000102003820038200382003820038
1002420037155006119686251001010100001010000502847521120018200372003718443031876710010201000020100002003720037111002110910101000010000640316331978610000102003820038200382003820038
1002420037155006119686251001010100001010000502847521120018200372003718443031876710010201000020100002003720037111002110910101000010000640316331978610000102003820038200382003820038
1002420037155006119686251001010100001010000502847521120018200372003718443031876710010201000020100002003720037111002110910101000010000640316331978610000102003820038200382003820038
1002420037155006119686251001010100001010000502847521120018200372003718443031876710010201000020100002003720037111002110910101000010000640316331978610000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  ushr d0, d8, #3
  ushr d1, d8, #3
  ushr d2, d8, #3
  ushr d3, d8, #3
  ushr d4, d8, #3
  ushr d5, d8, #3
  ushr d6, d8, #3
  ushr d7, d8, #3
  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)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)9fa8acc5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8020420060156003342580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151182163320035800001002003920039200392003920039
80204200381550010322580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151183163420035800001002003920039200392003920039
8020420038155005092580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151183163320035800001002003920039200392003920039
802042003815500292580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001002011151183162320035800001002003920039200392003920039
8020420038156001932580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151184164320035800001002003920039200392003920039
8020420038155001682580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151184162220035800001002003920039200392003920039
8020420038155002352580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151184164320035800001002003920039200392003920039
8020420038155001802580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151183163420035800001002003920039200392003920039
8020420038155001572580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151183163420035800001002003920039200392003920039
8020420038155001642580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151184163420035800001002003920039200392003920039

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)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 function returns (8f)inst branch taken (90)inst b.cc (94)inst integer (97)inst neon or fp (9a)9fa8accfd2d5d6ddinst fetch restart (de)e0ea? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200511560392580010108000010800005064000002001920038200389996310018800102080000208000020038200381180021100910108000010105020018165520035080000102003920039200392003920039
8002420038155039258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110091010800001000502004166420035080000102008820091200392003920039
80024200381561839258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110091010800001020502006165620035080000102003920039200392003920039
8002420038155039258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110091010800001013502006166620035080000102003920039200392003920039
80024200381600129258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110091010800001000502004164520035080000102003920039200392003920039
8002420038155039258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110091010800001000502006166920035080000102003920039200392003920039
8002420038156039258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110091010800001000502006169420035080000102003920039200392003920039
8002420038155039258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110091010800001000502008165320035080000102003920039200392003920039
80024200381550392580010108000010800005064000002001920038200389996310018800102080000208000020038200381180021100910108000010235020081610920035080000102003920039200392003920039
80024200381550392580010108000010800005064000002001920038200389996310018800102080000208000020038200381180021100910108000010005020041610420035080000102003920039200392003920039