Don't allow signed pointer comparison. #1561
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The LLVM manual is unclear as to whether signed pointer comparisons are allowed. I can't see that they make sense, and I haven't yet encountered such things, so I prefer to `panic` if we do see them: this means that I no longer need to worry about zero/sign extending pointers in the optimiser. [Note: `ptrdiff_t`-esque things clearly can be signed. But I'm not sure that pointers per se make sense as being signed.]
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I agree! :) |
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The LLVM manual is unclear as to whether signed pointer comparisons are allowed. I can't see that they make sense, and I haven't yet encountered such things, so I prefer to
panicif we do see them: this means that I no longer need to worry about zero/sign extending pointers in the optimiser.[Note:
ptrdiff_t-esque things clearly can be signed. But I'm not sure that pointers per se make sense as being signed.]