Beginning x64 Assembly Programming: From Novice to AVX Professional

© Jo Van Hoey 2019

J. Van HoeyBeginning x64 Assembly Programminghttps://doi.org/10.1007/978-1-4842-5076-1_37

37. Matrix Transpose

Jo Van Hoey¹ 

(1)

Hamme, Belgium

 

Let’s do one last matrix operation that is useful: transposing. We have coded two versions, one using unpacking and one using shuffling.

Example Transposing Code

Listing 37-1 shows the code.

; transpose4x4.asm

extern printf

section .data

      fmt0   db      "4x4 DOUBLE PRECISION FLOATING POINT MATRIX TRANSPOSE",10,0

      fmt1   db      10,"This is the matrix:",10,0

      fmt2   db      10,"This is the transpose (unpack):",10,0

      fmt3   db      10,"This is the transpose (shuffle):",10,0

      align  32

      matrix dq       1.,     2.,     3.,     4.

             dq       5.,     6.,     7.,     8. ...