Vectorizer fails to handle this:
-----------------------------------------------------
extern "C" double sqrt(double);
#define NUMPOINTS 50000
static float points[NUMPOINTS][4];
static float opoints[NUMPOINTS][4];
static bool flags[NUMPOINTS];
void NormalizeVectors (void)
{
int i, r;
float s, x, y, z;
static float d = 0.0;
d += 0.2;
if (d > 4) d = 0.0;
for (r=0; r<4; r++)
{
for (i=0; i<NUMPOINTS; i++)
{
x = points[i][0];
y = points[i][1];
z = points[i][2];
s = x * x
+ y * y
+ z * z;
s = d / sqrt (s);
opoints[i][0] = x * s;
opoints[i][1] = y * s;
opoints[i][2] = z * s;
flags[i] = true;
}
}
}
-----------------------------------------------------
loop at bench.cc:79: not vectorized: unhandled data ref: d.0_36 = d
loop at bench.cc:79: bad data references.
This is a bit more complex than the other two I posted, I guess. Anyway, the
first problem seems related to the static variable.
--
Summary: vectorizer failed for vector normalization
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: enhancement
Priority: P2
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: giovannibajo at libero dot it
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18439
