https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93126
Bug ID: 93126
Summary: PPC altivec -Wunused-but-set-variable false positive
Product: gcc
Version: 8.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: jens.seifert at de dot ibm.com
Target Milestone: ---
Input:
#include <altivec.h>
double vmax(double a, double b)
{
#ifdef _BIG_ENDIAN
const long PREF = 0;
#else
const long PREF = 1;
#endif
vector double va = vec_promote(a,PREF);
vector double vb = vec_promote(b,PREF);
return vec_extract(vec_max(va, vb), PREF);
}
gcc -O2 -maix64 -mcpu=power7 -maltivec -Wall
warn.C: In function 'double vmax(double, double)':
warn.C:6:15: warning: variable 'PREF' set but not used
[-Wunused-but-set-variable]
const long PREF = 0;
^~~~
