** Package changed: linux (Ubuntu) => gcc-defaults (Ubuntu)
** Also affects: ubuntu-z-systems
Importance: Undecided
Status: New
** Changed in: ubuntu-z-systems
Importance: Undecided => High
** Changed in: gcc-defaults (Ubuntu)
Importance: Undecided => High
** Changed in: ubuntu-z-systems
Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)
** Changed in: gcc-defaults (Ubuntu)
Assignee: Skipper Bug Screeners (skipper-screen-team) => Canonical
Foundations Team (canonical-foundations)
** Changed in: ubuntu-z-systems
Status: New => Triaged
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https://bugs.launchpad.net/bugs/1856682
Title:
GCC Miscompilation in vectorized code
Status in Ubuntu on IBM z Systems:
Triaged
Status in gcc-defaults package in Ubuntu:
New
Bug description:
Miscompilation in autovectorized code.
---Steps to Reproduce---
See GCC BZ: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92950
The following testcase abort when being compiled with -O3 -march=z13
on IBM Z:
struct a {
int b;
char c;
};
struct a d = {1, 16};
struct a *e = &d;
int f = 0;
int main() {
struct a g = {0, 0 };
f = 0;
for (; f <= 1; f++) {
g = d;
*e = g;
}
if (d.c != 16)
__builtin_abort();
}
The movv1qi pattern emits halfword load instructions instead of character
loads.
All GCC versions since GCC 5 are affected.
Patches for GCC 8, 9, and 10 have been committed to the gcc.gnu.org branches.
Userspace tool common name: gcc
The userspace tool has the following bit modes: 64
Userspace rpm: various Ubuntu gcc packages
Package need to updated within LP
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