New submission from Stefan Krah <[email protected]>:
At least the xlc version on AIX 7.1 has aggressive optimizations even
with -O:
====================================================================
#include <stdio.h>
#include <stdlib.h>
static int
f(long *a, long long *b)
{
int t = *a;
*b = 0; // cannot change *a
return *a - t; // can be folded to zero
}
int
main(void)
{
long a = 10;
printf("%d\n", f(&a, (long long *)&a));
return 0;
}
====================================================================
$ xlc -O -o alias alias.c
$ ./alias
0
$
$ xlc -O -qalias=noansi -o alias alias.c
$ ./alias
-10
----------
components: +Build
type: -> behavior
versions: +Python 3.10, Python 3.9
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<https://bugs.python.org/issue41721>
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