Alyssa Rosenzweig
d0aaf52602
If an instruction has multiple destinations and *any* of them are needed by
helper invocations, we should keep helper invocations alive. This is a bug fix.
Consider the GLSL:
first = texture(sampler, ...);
float res = texture(sampler, vec2(first.y)).x + first.x;
Corresponding to the IR:
first = ...
x, y, z, w = SPLIT first
second = TEX y, y
x', y', z', w' = SPLIT second
FADD res, x, x'
Here, x is not required by helper invocations (the coordinates to TEX) while y
is required. If we only look at only the first destinations, we incorrectly
decide that first is not required and fail to set the .skip bit, leading to
incorrect results.
Fixes: 5febeae58e ("pan/bi: Emit collect and split")
Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17794>
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