http://llvm.org/bugs/show_bug.cgi?id=2981
Summary: Vector logic does not get optimized
Product: new-bugs
Version: unspecified
Platform: PC
OS/Version: Windows NT
Status: NEW
Severity: normal
Priority: P2
Component: new bugs
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
CC: [email protected]
The attached testcase contains a logical and operation that does not get
optimized away. Here's the code in 'pseudo vector C':
void foo(int4 *in, int count, int4 *out)
{
int4 x = *in;
int4 a[1];
a[0] = {0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF};
int t = 0;
for(int i = 0; i < count; i++)
{
x = x & a[t]; // Optimize me
*out = x;
}
}
The combination of the array and the loop somehow stop LLVM from eliminating
the and operation. Replacing the vectors by scalars does optimize it away
though. So possibly some code isn't treating scalars and vectors equally for
this type of optimization. I suspect that several other vector operations don't
get fully optimized either.
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