https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115589
Bug ID: 115589
Summary: (aarch64) clobbered register variables
Product: gcc
Version: 11.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: pietro.braione at gmail dot com
Target Milestone: ---
/*
* compiled with gcc -O0, on my platform (Ubuntu 22.04 aarch64) prints:
*
* 4
* 2
*
* This is a very simplified example. In my production code I have
* variables that are assigned register x21-x23, and gcc generates
* code that uses these registers as temporaries without saving
* elsewhere the content of the variables, that are lost.
*/
#include <stdio.h>
int a = 1, b = 1, c = 1, d = 1;
void main() {
register int x asm("x0");
x = 0;
printf("%d\n", a + b + c + d);
printf("%d\n", x);
}
