[Bug c/106264] [10/11/12/13 Regression] spurious -Wunused-value on a folded frexp, modf, and remquo calls with unused result since r9-1295-g781ff3d80e88d7d0
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106264 --- Comment #9 from Roger Sayle --- *** Bug 101090 has been marked as a duplicate of this bug. ***
[Bug c/106264] [10/11/12/13 Regression] spurious -Wunused-value on a folded frexp, modf, and remquo calls with unused result since r9-1295-g781ff3d80e88d7d0
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106264
Vincent Lefèvre changed:
What|Removed |Added
CC||vincent-gcc at vinc17 dot net
--- Comment #8 from Vincent Lefèvre ---
This seems to be the same issue as PR101090 ("incorrect -Wunused-value warning
on remquo with constant values"), which I had reported in 2021 and was present
in GCC 9 too.
[Bug c/106264] [10/11/12/13 Regression] spurious -Wunused-value on a folded frexp, modf, and remquo calls with unused result since r9-1295-g781ff3d80e88d7d0
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106264 Roger Sayle changed: What|Removed |Added Resolution|--- |FIXED Status|ASSIGNED|RESOLVED Target Milestone|10.5|13.0 --- Comment #7 from Roger Sayle --- This has now been fixed on mainline for GCC 13. Please feel free to reopen this PR if folks consider this problem serious enough to backport the fix to the release branches.
[Bug c/106264] [10/11/12/13 Regression] spurious -Wunused-value on a folded frexp, modf, and remquo calls with unused result since r9-1295-g781ff3d80e88d7d0
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106264 --- Comment #6 from CVS Commits --- The master branch has been updated by Roger Sayle : https://gcc.gnu.org/g:40f6e5912288256ee8ac41474f2dce7b6881c111 commit r13-1741-g40f6e5912288256ee8ac41474f2dce7b6881c111 Author: Roger Sayle Date: Tue Jul 19 08:39:43 2022 +0100 PR c/106264: Silence warnings from __builtin_modf et al. This middle-end patch resolves PR c/106264 which is a spurious warning regression caused by the tree-level expansion of modf, frexp and remquo producing "expression has no-effect" when the built-in function's result is ignored. When these built-ins were first expanded at tree-level, fold_builtin_n would blindly set TREE_NO_WARNING for all built-ins. Now that we're more discerning, we should precisely call suppress_warning selectively on those COMPOUND_EXPRs that need them. 2022-07-19 Roger Sayle Richard Biener gcc/ChangeLog PR c/106264 * builtins.cc (fold_builtin_frexp): Call suppress_warning on COMPOUND_EXPR to silence spurious warning if result isn't used. (fold_builtin_modf): Likewise. (do_mpfr_remquo): Likewise. gcc/testsuite/ChangeLog PR c/106264 * gcc.dg/pr106264.c: New test case.
[Bug c/106264] [10/11/12/13 Regression] spurious -Wunused-value on a folded frexp, modf, and remquo calls with unused result since r9-1295-g781ff3d80e88d7d0
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106264 Roger Sayle changed: What|Removed |Added CC||roger at nextmovesoftware dot com Assignee|unassigned at gcc dot gnu.org |roger at nextmovesoftware dot com Status|NEW |ASSIGNED --- Comment #5 from Roger Sayle --- Patch proposed: https://gcc.gnu.org/pipermail/gcc-patches/2022-July/598480.html
[Bug c/106264] [10/11/12/13 Regression] spurious -Wunused-value on a folded frexp, modf, and remquo calls with unused result since r9-1295-g781ff3d80e88d7d0
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106264 Martin Liška changed: What|Removed |Added CC||marxin at gcc dot gnu.org Keywords|needs-bisection | Summary|[10/11/12/13 Regression]|[10/11/12/13 Regression] |spurious -Wunused-value on |spurious -Wunused-value on |a folded frexp, modf, and |a folded frexp, modf, and |remquo calls with unused|remquo calls with unused |result |result since ||r9-1295-g781ff3d80e88d7d0 --- Comment #4 from Martin Liška --- Yes, started with r9-1295-g781ff3d80e88d7d0.
