[PATCH] D30759: With PIE on x86_64, keep hot local arrays on the stack

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

In theory, the C/C++ standards require behavior equivalent to -fno-merge-all-constants.  In practice, code doesn't actually depend on that, so we made the decision many years ago to turn on -fmerge-all-constants by default.

Anyway, you don't really want the behavior of the optimizer to depend on whether the constant array is marked "static"; it probably doesn't reflect the user's intent in any useful way.

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I'm sort of surprised you didn't mention register pressure at all in your explanation.


https://reviews.llvm.org/D30759