http://llvm.org/bugs/show_bug.cgi?id=21065
Bug ID: 21065
Summary: Similar loops are not always vectorized
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Loop Optimizer
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
The generated IR (with clang -O3) from this code:
#include <stdlib.h>
void foo(double * d, unsigned int size)
{
for (unsigned int i = 0; i < size; ++i)
{
d[i] += 1;
}
}
void bar(unsigned int size)
{
double * d = malloc(size * sizeof(double));
for (unsigned int i = 0; i < size; ++i)
{
d[i] += 1;
}
foobar(d);
}
void oof(unsigned int size)
{
double * d = malloc(size * sizeof(double));
foo(d, size);
foobar(d);
}
shows that the loop in foo is vectorized but not in bar.
The call to foo in oof has been inlined but the vectorization has been removed.
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