bacdd5e978
The following testcase ICEs, because the PR84305 changes try to evaluate the size earlier. If size has side-effects, that is desirable, and the side-effects will actually be wrapped in a SAVE_EXPR. The problem on this testcase is that there are no side-effects, and c_fully_fold doesn't fold those COMPOUND_EXPRs to constant, and while before gimplification we unshare trees found in the expressions, the unsharing doesn't involve TYPE_SIZE etc. of used types. Gimplification is destructive though, so when we gimplify the two nested COMPOUND_EXPRs and then try to gimplify it the second time for the TYPE_SIZEs, we ICE. Now, we could use unshare_expr in what we push to *expr, SAVE_EXPRs and their operands in there aren't unshared, but I really don't see a point of evaluating expressions that don't have side-effects before, so instead this just pushes there expressions that do have side-effects. 2020-02-13 Jakub Jelinek <jakub@redhat.com> PR c/93576 * c-decl.c (grokdeclarator): If this_size_varies, only push size into *expr if it has side effects. * gcc.dg/pr93576.c: New test. |
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