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Hi there
i have some general questions on SELECT instructions and their support
in GCC, i.e. instructions that apply a conditional move given the
value of a predicate.
E.g. a select instruction would have the following semantics:
dst <- SELECT cond, src1, src2 where dst = src1, if cond is true;
src2, otherwise.
[May also see reference:
http://lapwww.epfl.ch/dev/machsuif/opt_passes/index.php; specifically
the ifconv.pdf pass and documentation]
Such instructions are useful for partial predication. A conditional
move of src1 would be applied for dst = src2.
Here are my questions:
1. How should I code the pattern for a SELECT instruction in an *.md file?
2. Does any available backend define (and is able to match) something
like a conditional move?
3. Should I devise a peephole pattern for matching SELECT constructs?
Any directions to that?
I would like to thank you in advance.
Kind regards
Nikolaos Kavvadias
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