Optimization_4x4_7

Copy the contents of file MMult_4x4_6.c into a file named MMult_4x4_7.c and change the contents:

|| from || to || ||<^> -Include(HowToOptimizeGemm/Details/MMult_4x4_6)- ||<^> -Include(HowToOptimizeGemm/Details/MMult_4x4_7)- ||

Change the first lines in the makefile to {{{ OLD := MMult_4x4_6 NEW := MMult_4x4_7 }}}

• make run {{{ octave:3> PlotAll % this will create the plot }}}

This time the performance graph will look something like

ImageLink(http://www.cs.utexas.edu/users/rvdg/HowToOptimizeGemm/Graphs/compare_MMult-4x4-6_MMult-4x4-7.png,http://www.cs.utexas.edu/users/rvdg/HowToOptimizeGemm/Graphs/compare_MMult-4x4-6_MMult-4x4-7.png,width=40%) ImageLink(http://www.cs.utexas.edu/users/rvdg/HowToOptimizeGemm/Graphs/compare_MMult-1x4-7_MMult-4x4-7.png,http://www.cs.utexas.edu/users/rvdg/HowToOptimizeGemm/Graphs/compare_MMult-1x4-7_MMult-4x4-7.png,width=40%)

Here We changed to using pointers to track the current 4x1 block of B.