Apple M1 Microarchitecture Research by Dougall Johnson

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

SQSHL (immediate, vector, 4H)

Test 1: uops

Code:

  sqshl v0.4h, v0.4h, #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)03081e3f4e51inst 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)a1a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
10042037150061168625100010001000264521120182037203715713189510001000100020372037111001100000373116111786100020382038203820382038
10042037150061168625100010001000264521120182037203715713189510001000100020372037111001100000073116111786100020382038203820382038
10042037150061168625100010001000264521120182037203715713189510001000100020372037111001100001373116111786100020382038203820382038
10042037160061168625100010001000264521120182037203715713189510001000100020372037111001100000073116111786100020382038203820382038
10042037150061168625100010001000264521120182037203715713189510001000100020372037111001100000073116111786100020382038203820382038
10042037150061168625100010001000264521120182037203715713189510001000100020372037111001100000073116111786100020382038203820382038
10042037160061168625100010001000264521120182037203715713189510001000100020372037111001100000073116111786100020382038203820382038
10042037150061168625100010001000264521120182037203715713189510001000100020372037111001100000073116111786100020382038203820382038
100420371502461168625100010001000264521120182037203715713189510001000100020372037111001100000073116111786100020382038203820382038
100420371501861168625100010001000264521120182037203715713189510001000100020372037111001100000073116111786100020382038203820382038

Test 2: Latency 1->2

Code:

  sqshl v0.4h, v0.4h, #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)030b181e1f3a3f4e51inst 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
1020420037150000006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
1020420037150000006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000100071011611197910100001002003820038200382003820038
1020420037150000006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
1020420037150000006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000000071011621197910100001002003820038200382003820038
1020420037150000006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000000071021611197910100001002003820038200382003820038
10204200371500012006119686251010010410012100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
1020420037150000006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000202292003711102011009910010010000100000107943071011611199330100001002003820038200382003820038
1020420037150000006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000000071011611197910100001002003820038200382003820038
1020420037150000006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000120071011611197910100001002003820038200382003820038
1020420037150000006119686251010010010000100100005002847521120018200372003718421318745101002001000020010000200372003711102011009910010010000100000000071011613197910100001002003820038200382003820038

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)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)9fa9accfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100242003715000611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010006405165419822010000102003820038200382003820038
100242003715000611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010006404165519786010000102003820038200382003820038
100242003715010611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010006404164519786010000102003820038200382003820038
100242003715000611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010006404165419786010000102003820038200382003820038
100242003715010611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010006404164519786010000102003820038200382003820038
100242003714900611968625100101010000101000050284752112001820037200371845931876710010201000020100002003720037111002110910101000010006404165419786010000102003820038200382003820038
100242003715000611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010006404164519786010000102003820038200382003820038
100242003714900611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010006404164519786010000102003820038200382003820038
100242003715010611968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010006405165519786010000102003820038200382003820038
1002420037150003461968625100101010000101000050284752112001820037200371844331876710010201000020100002003720037111002110910101000010036404165519786010000102003820038200382003820038

Test 3: throughput

Count: 8

Code:

  sqshl v0.4h, v8.4h, #3
  sqshl v1.4h, v8.4h, #3
  sqshl v2.4h, v8.4h, #3
  sqshl v3.4h, v8.4h, #3
  sqshl v4.4h, v8.4h, #3
  sqshl v5.4h, v8.4h, #3
  sqshl v6.4h, v8.4h, #3
  sqshl v7.4h, v8.4h, #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)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 branch taken (90)inst b.cc (94)inst integer (97)inst neon or fp (9a)9fa8acc5branch mispredict (cb)cdcfd6e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200571500292580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151181620035800001002003920039200392003920039
80204200381500292580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151181620035800001002003920039200392003920039
80204200381500292580108100800081008002050064013212001920038200389977699898012020080032200800322003820038118020110099100100800001000011151181620035800001002003920039200392003920039
80204200381500292580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151181620035800001002003920039200392003920039
80204200381500292580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151181620035800001002003920039200392003920039
80204200381500292580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151181620035800001002003920039200392003920039
80204200381500292580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151181620035800001002003920039200392003920039
8020420038150309292580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151181620035800001002003920039200392003920039
8020420038150402292580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000011151181620035800001002003920039200392003920039
802042003815018292580108100800081008002050064013202001920038200389977699898012020080032200800322003820038118020110099100100800001000311151181620035800001002003920039200392003920039

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03040708090b18191e1f3f51inst 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
8002420051150000000000229258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110910108000010000000050206167720035080000102003920039200392003920039
800242003815000000000039258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010000000050205165620035080000102003920039200392003920039
8002420038150000000000392580010108000010800005064000012017120038200381000431001880010208000020800002003820038118002110910108000010000000050206166720035080000102010920191200392003920039
8002420038150000000000210258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010000003050206168820035080000102003920039200392003920039
800242003815000000000039258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010000000050205165620035080000102003920039200392003920039
800242003815000000000039258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110910108000010000000050207165620035080000102003920039200392003920088
800242003815000000000081258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110910108000010000000050206167520035080000102003920039201882003920039
8002420038150000000000230258001010800001080000506400001200192003820038999631001880010208000020800002003820038118002110910108000010000000050206166520035080000102003920039200392003920039
800242003815000000000039258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110910108000010000000050208167520035080000102003920039200392003920039
800242003815000000000039258001010800001080000506400000200192003820038999631001880010208000020800002003820038118002110910108000010000100050206168720035080000102003920039200392003920039