Module tables

Lookup-tables used by Engine:s.

All tables are global and each is initialized at most once.

Tables

Table	Size	Used in encoding	Used in decoding	By engines
Exp	128 kiB	yes	yes	all
Log	128 kiB	yes	yes	all
LogWalsh	128 kiB	-	yes	all
Mul16	8 MiB	yes	yes	NoSimd
Mul128	8 MiB	yes	yes	Avx2 Ssse3
Skew	128 kiB	yes	yes	all

Structs

• ExpLog
  Struct holding the Exp and Log lookup tables.
• Multiply128lutT
  Elements of the Mul128 table

Statics

• EXP_LOG
  Lazily initialized exponentiation and logarithm tables.
• LOG_WALSH
  Lazily initialized logarithmic Walsh transform table.
• MUL16
  Lazily initialized multiplication table for the NoSimd engine.
• MUL128
  Lazily initialized multiplication table for SIMD engines.
• SKEW
  Lazily initialized skew table used in FFT and IFFT operations.

Functions

• mul
  Calculates x * log_m using Exp and Log tables.

Type Aliases

• Exp
  Used by Naive engine for multiplications and by all Engine:s to initialize other tables.
• Log
  Used by Naive engine for multiplications and by all Engine:s to initialize other tables.
• LogWalsh
  Used by all Engine:s in Engine::eval_poly.
• Mul16
  Used by NoSimd engine for multiplications.
• Mul128
  Used by Avx2 and Ssse3 engines for multiplications.
• Skew
  Used by all Engine:s for FFT and IFFT.