[LLVMdev] Missed constant replacement opportunity with llvm.assume?

[Josh Klontz]

As of ToT it seems that even the simplest cases of assumes involving
equality between an instruction and a constant don't cause an instruction
RAUW constant.

In the attached example, %channels is assumed to be 3, leading to a missed
optimization opportunity with %src_c.

Am I overlooking something that would cause this optimization to be invalid?

v/r,
Josh
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