https://bugs.freedesktop.org/show_bug.cgi?id=105670
--- Comment #11 from Gert Wollny <gw.foss...@gmail.com> ---
The if statement can be be true because
tmp0.w = (R3.w >= 0.0 ? abs(ps_lc18.w) : abs(ps_lc18.y));
with ps_lc18.y = -1 and ps_lc18.w = 0.0, and then
R3.w = (tmp0.w);
R3.w = (R5.w * R3.w);
which means at this point R3.w can be zero.
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