Viewing file:  loop-versioning-10.c (1.04 KB) -rw-r--r--
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/* { dg-options "-O3 -fdump-tree-lversion-details" } */
/* Test that we can version a gather-like operation in which a variable
stride is applied to the index. */
int
f1 (int *x, int *index, int step, int n)
{
int res = 0;
for (int i = 0; i < n; ++i)
res += x[index[i] * step];
return res;
}
int
f2 (int *x, int *index, int step, int n)
{
int res = 0;
for (int i = 0; i < n; ++i)
{
int *ptr = x + index[i] * step;
res += *ptr;
}
return res;
}
int x[1000];
int
g1 (int *index, int step, int n)
{
int res = 0;
for (int i = 0; i < n; ++i)
res += x[index[i] * step];
return res;
}
int
g2 (int *index, int step, int n)
{
int res = 0;
for (int i = 0; i < n; ++i)
{
int *ptr = x + index[i] * step;
res += *ptr;
}
return res;
}
/* { dg-final { scan-tree-dump-times {address term [^\n]* \* loop-invariant} 4 "lversion" } } */
/* { dg-final { scan-tree-dump-times {want to version containing loop} 4 "lversion" } } */
/* { dg-final { scan-tree-dump-times {versioned this loop} 4 "lversion" } } */
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