Re: [PATCH v7 0/2] MR1618: gdiplus: improve performance of GdipScaleMatrix

[Esme Povirk (＠madewokherd)]

On Fri Dec  2 21:47:10 2022 +0000, Bartosz Kosiorek wrote:
> With only `gdiplus: improve performance of matrix multiplication by
> unrolling loop.` commit applied, I had:
> Wine gdiplus.dll **with only `matrix_multiply` optimizations** and
> `matrix_multiply` inlining:
> - 500 x `GdipScaleMatrix` time (seconds): 0.21s
> - 700 x `GdipMultiplyMatrix` time (seconds): 0.14s
>
> Generally I cannot get value below 0.21s (with `GdipScaleMatrix`
> sometimes I get 0.06s).
> It seems that similar optimizations are applied in native Windows
> gdiplus.dll, as `GdipScaleMatrix` is faster than `GdipMultiplyMatrix`
> (which will not be possible with using `matrix_multiply`):
> Native (Windows gdiplus.dll)
> - 500 x`GdipScaleMatrix` time (seconds): 0.84s
> - 700 x`GdipMultiplyMatrix` time (seconds): 1.22s

I just wanted to verify that it simplifies the generated code for GdipScaleMatrix even with the second patch applied, which it does.