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by _cbsz
6241 days ago
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This isn't even "modern" in compiler terms, it's a simple peephole optimization. (grep through the IR, check for "X / 2^n", replace by "X >> n") To get it right when you have int a;
int b = 64;
a / b
requires dataflow analysis so you can do constant propagation, copy propagation, and dead code elimination. This is more work to get right, but that's not a very good excuse for not at least doing the peephole optimization. |
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