[PATCH] D54355: Use is.constant intrinsic for __builtin_constant_p

[James Y Knight via Phabricator via cfe-commits]

jyknight added a comment.

That example cannot be expected to ever evaluate the expression as "1" -- it doesn't in GCC, nor should it in Clang. An asm constraint of "n" or "i" (but not, e.g., "nr") must require a constant expression, and evaluating the argument as a constant expression necessarily means always evaluating it to -1.


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  rC Clang

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https://reviews.llvm.org/D54355