https://bugs.freedesktop.org/show_bug.cgi?id=105333
--- Comment #18 from Axel Davy davyaxel0@gmail.com --- PixWin enables to use ProcessVertices which outputs the vs shader outputs.
I looked at the output which would give the IN[4].w
If found that for llvmpipe (used for ProcessVertices) the vs output is between 0 and 1. However I tried with radeonsi, and... it displays a NaN for that output...
I guess one of the input is NaN and llvmpipe clamps it (the vs output is the subtraction between two vs inputs).
If that output is really NaN, I guess it can explain the regression. A small change (x < 0 vs 0 > x) will give different result with NaN.
I tried to change the order for the test in radeonsi's kil_emit, but the generated isa doesn't change the test order between 0 and x.