[Bug libgcc/99236] Undefined behaviour in libgcc
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99236 Jakub Jelinek changed: What|Removed |Added Last reconfirmed||2021-02-24 Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org Status|UNCONFIRMED |ASSIGNED Ever confirmed|0 |1 CC||jakub at gcc dot gnu.org
[Bug libgcc/99236] Undefined behaviour in libgcc
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99236 --- Comment #1 from Jakub Jelinek --- Created attachment 50246 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50246&action=edit gcc11-pr99236.patch Untested fix.
[Bug libgcc/99236] Undefined behaviour in libgcc
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99236 --- Comment #2 from Vittorio Zecca --- After patching libgcc2.c the test case runs fine without sanitizer messages.
[Bug libgcc/99236] Undefined behaviour in libgcc
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99236 --- Comment #3 from CVS Commits --- The master branch has been updated by Jakub Jelinek : https://gcc.gnu.org/g:35da095d7e0614235cb0e241685c5e1a240dc882 commit r11-7374-g35da095d7e0614235cb0e241685c5e1a240dc882 Author: Jakub Jelinek Date: Wed Feb 24 20:07:38 2021 +0100 libgcc: Avoid signed negation overflow in __powi?f2 [PR99236] When these functions are called with integer minimum, there is UB on the libgcc side. Fixed in the obvious way, the code in the end wants ABSU_EXPR behavior. 2021-02-24 Jakub Jelinek PR libgcc/99236 * libgcc2.c (__powisf2, __powidf2, __powitf2, __powixf2): Perform negation of m in unsigned type.
[Bug libgcc/99236] Undefined behaviour in libgcc
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99236 Jakub Jelinek changed: What|Removed |Added Resolution|--- |FIXED Status|ASSIGNED|RESOLVED --- Comment #4 from Jakub Jelinek --- Fixed in GCC 11, IMHO not worth backporting.
