https://bugs.llvm.org/show_bug.cgi?id=52128
Bug ID: 52128
Summary: Failure to vectorize accumulation when result is
stored in memory
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
void mac(const int *b, int *sum)
{
int dotp = 0;
for (int i = 0; i < 32; i++)
dotp += b[i];
*sum = dotp;
}
This is not vectorized, but could be. This is done by GCC, but not by LLVM.
PS: Oddly, this can easily be changed to vectorize, but only by making it so
`dotp` is returned instead of stored into memory.
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