Vectorizer fails to handle this:
----------------------------------------------------
#define align(x) __attribute__((align(x)))
typedef float align(16) MATRIX[3][3];
void RotateMatrix(MATRIX ret, MATRIX a, MATRIX b)
{
int i, j;
for (j = 0; j < 3; j++)
for (i = 0; i < 3; i++)
ret[j][i] = a[j][0] * b[0][i]
+ a[j][1] * b[1][i]
+ a[j][2] * b[2][i];
}
----------------------------------------------------
loop at bench.cc:33: not vectorized: unsupported scalar cycle.
loop at bench.cc:33: bad scalar cycle.
--
Summary: vectorizer failed for matrix multiplication
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: normal
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=18437
