https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99122
--- Comment #27 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Martin Jambor <jamb...@gcc.gnu.org>: https://gcc.gnu.org/g:f225c6b0c50dc472e0b73b440b572a3bf1514020 commit r11-7817-gf225c6b0c50dc472e0b73b440b572a3bf1514020 Author: Martin Jambor <mjam...@suse.cz> Date: Wed Mar 24 20:27:27 2021 +0100 ipa: Check that scalar types that IPA-CP comes up with are sane (PR99122) This patch fixes the last bit of PR 99122 where various bits of IPA infrastructure are presented with a program with type mismatches that make it have undefined behavior, and when inlining or performing IPA-CP, and encountering such mismatch, we basically try to VIEW_CONVERT_EXPR whatever the caller has into whatever the callee has or simply use an empty constructor if that cannot be done. This however does not work when the callee has VLA parameters because we ICE in the process. Richi has already disabled inlining for such cases, this patch avoids the issue in IPA-CP. It adds checks that whatever constant the propagation arrived at is actually compatible or fold_convertible to the callees formal parameer type. Unlike in the past, we now have types of all parameters of functions that we have analyzed, even with LTO, and so can do it. This should prevent only bogus propagations. I have looked at the effect of the patch on WPA of Firefox and did not have any. I have bootstrapped and LTO bootstrapped and tested the patch on x86_64-linux. OK for trunk? And perhaps later for GCC 10 too? Thanks gcc/ChangeLog: 2021-02-26 Martin Jambor <mjam...@suse.cz> PR ipa/99122 * ipa-cp.c (initialize_node_lattices): Mark as bottom all parameters with unknown type. (ipacp_value_safe_for_type): New function. (propagate_vals_across_arith_jfunc): Verify that the constant type can be used for a type of the formal parameter. (propagate_vals_across_ancestor): Likewise. (propagate_scalar_across_jump_function): Likewise. Pass the type also to propagate_vals_across_ancestor. gcc/testsuite/ChangeLog: 2021-02-26 Martin Jambor <mjam...@suse.cz> PR ipa/99122 * gcc.dg/pr99122-3.c: Remove -fno-ipa-cp from options.
