Displaying 1 result from an estimated 1 matches for "block_box".
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black_box
2015 Nov 03
3
[RFC] A new intrinsic, `llvm.blackbox`, to explicitly prevent constprop, die, etc optimizations
The common use case I've seen for a black box like construct is when
writing microbenchmarks. In particular, you're generally looking for a
way to "sink" the result of a computation without having that sink
outweigh the cost of the thing you're trying to measure.
Common alternate approaches are to use a volatile store (so that it
can't be eliminated or sunk out of