[Webkit-unassigned] [Bug 212477] Extended Color: ColorMatrix should support smaller matrices and be constexpr

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=212477

--- Comment #1 from Sam Weinig <sam at webkit.org> ---
Created attachment 400476

  --> https://bugs.webkit.org/attachment.cgi?id=400476&action=review

proof of concept

Here is a proof-of-concept. Not sure if the actual matrix match is 100% right yet, but the code nicely compiles down to:

:-) samweinig:~> otool -Vx a.out 
a.out:
(__TEXT,__text) section
_main:
0000000100000f4a        pushq   %rbp
0000000100000f4b        movq    %rsp, %rbp
0000000100000f4e        leaq    0x53(%rip), %rdi ## literal pool for: "%f, %f, %f, %f\n"
0000000100000f55        movsd   0x3b(%rip), %xmm0
0000000100000f5d        movsd   0x3b(%rip), %xmm3
0000000100000f65        movaps  %xmm0, %xmm1
0000000100000f68        movaps  %xmm0, %xmm2
0000000100000f6b        movb    $0x4, %al
0000000100000f6d        callq   0x100000f76 ## symbol stub for: _printf
0000000100000f72        xorl    %eax, %eax
0000000100000f74        popq    %rbp
0000000100000f75        retq

when compiled with `clang++ -std=c++17 -Os matrix.cpp`

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