https://bugs.llvm.org/show_bug.cgi?id=33710
Bug ID: 33710
Summary: Restrict Clause stops vectorization
Product: libraries
Version: 4.0
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Loop Optimizer
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
// This function computes 2D-5 point Jacobi stencil
void stencil(int a[restrict][N], int b[restrict][N])
{
int i, j, k;
for (k = 0; k < N; k++) {
for (i = 1; i <= N-2; i++)
for (j = 1; j <= N-2; j++)
b[i][j] = 0.25 * (a[i][j] + a[i-1][j] + a[i+1][j] + a[i][j-1]
+ a[i][j+1]);
for (i = 1; i <= N-2; i++)
for (j = 1; j <= N-2; j++)
a[i][j] = b[i][j];
}
}
but no vectorization is occurred in IR. Also, when I set vector width
explicitly to 64, it gives the following error:
remark: <unknown>:0:0: loop not vectorized: call instruction cannot be
vectorized
remark: <unknown>:0:0: loop not vectorized: value that could not be identified
as reduction is used outside the loop
It is due to restrict clause. However, when the restrict clause is removed then
get vectorized IR code.
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