https://bugs.llvm.org/show_bug.cgi?id=39643
Bug ID: 39643
Summary: unable to optimize creation and use of a lookup table
into the table entry
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: richard-l...@metafoo.co.uk
CC: llvm-bugs@lists.llvm.org
Testcase:
#include <array>
static std::array<int, 1000> f() {
std::array<int, 1000> a = {};
for (int n = 0; n != 1000; ++n) a[n] = n*n*n;
return a;
}
int cube(int n) { return f()[n]; }
We should be able to optimize that to:
int cube(int n) { return n*n*n; }
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