[Bug middle-end/95810] Spurious UBSan warning when computing the opposite of the absolute value of INT_MIN
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95810 --- Comment #4 from CVS Commits --- The releases/gcc-9 branch has been updated by Jakub Jelinek : https://gcc.gnu.org/g:6ff6c02695c9b6ae6e840422080f6d10449577b8 commit r9-8901-g6ff6c02695c9b6ae6e840422080f6d10449577b8 Author: Jakub Jelinek Date: Wed Jun 24 10:40:02 2020 +0200 fold-const: Fix A <= 0 ? A : -A folding [PR95810] We folded A <= 0 ? A : -A into -ABS (A), which is for signed integral types incorrect - can invoke on INT_MIN UB twice, once on ABS and once on its negation. The following patch fixes it by instead folding it to (type)-ABSU (A). 2020-06-24 Jakub Jelinek PR middle-end/95810 * fold-const.c (fold_cond_expr_with_comparison): Optimize A <= 0 ? A : -A into (type)-absu(A) rather than -abs(A). * gcc.dg/ubsan/pr95810.c: New test. (cherry picked from commit 01e10b0ee77e82cb331414c569e02dc7a2c4999e)
[Bug middle-end/95810] Spurious UBSan warning when computing the opposite of the absolute value of INT_MIN
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95810 --- Comment #3 from CVS Commits --- The master branch has been updated by Jakub Jelinek : https://gcc.gnu.org/g:01e10b0ee77e82cb331414c569e02dc7a2c4999e commit r11-1620-g01e10b0ee77e82cb331414c569e02dc7a2c4999e Author: Jakub Jelinek Date: Wed Jun 24 10:40:02 2020 +0200 fold-const: Fix A <= 0 ? A : -A folding [PR95810] We folded A <= 0 ? A : -A into -ABS (A), which is for signed integral types incorrect - can invoke on INT_MIN UB twice, once on ABS and once on its negation. The following patch fixes it by instead folding it to (type)-ABSU (A). 2020-06-24 Jakub Jelinek PR middle-end/95810 * fold-const.c (fold_cond_expr_with_comparison): Optimize A <= 0 ? A : -A into (type)-absu(A) rather than -abs(A). * gcc.dg/ubsan/pr95810.c: New test.
[Bug middle-end/95810] Spurious UBSan warning when computing the opposite of the absolute value of INT_MIN
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95810 --- Comment #2 from Jakub Jelinek --- Created attachment 48769 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48769=edit gcc11-pr95810.patch Untested fix.
[Bug middle-end/95810] Spurious UBSan warning when computing the opposite of the absolute value of INT_MIN
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95810 Jakub Jelinek changed: What|Removed |Added Ever confirmed|0 |1 Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org Last reconfirmed||2020-06-22 CC||jakub at gcc dot gnu.org Status|UNCONFIRMED |ASSIGNED
[Bug middle-end/95810] Spurious UBSan warning when computing the opposite of the absolute value of INT_MIN
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95810 Andrew Pinski changed: What|Removed |Added Component|tree-optimization |middle-end --- Comment #1 from Andrew Pinski --- It should have became uabs instead.
