[Bug 99465] vtn_vector_construct writing out of bounds when given multiple non-zero length sources

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99465

--- Comment #3 from Jason Ekstrand <jason at jlekstrand.net> ---
Created attachment 129377
  --> https://bugs.freedesktop.org/attachment.cgi?id=129377&action=edit
Invalid SPIR-V shader

I've attached the invalid shader.  The second OpCompositeConstruct in the
shader violates the SPIR-V spec in two ways.  It constructs a vec2 from a
single vec3 but

> When constructing a vector, the total number of components in all the operands
> must equal the number of components in Result Type.

and

> When constructing a vector, there must be at least two Constituent operands.

Yes, we could make our SPIR-V parser handle this and it might be useful for
debugging purposes, but it's definitely invalid and needs to be fixed.

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