https://bugs.llvm.org/show_bug.cgi?id=46850
Bug ID: 46850
Summary: Missed exception call elimination
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]
Initially posted at rust github: https://github.com/rust-lang/rust/issues/65969
Code:
https://github.com/rust-lang/rust/issues/65969
#include <vector>
int foo(std::vector<int> const& a, std::vector<int> const& b) {
int index = 0;
int x = 0;
for (int i = 0; i < a.size(); i++) {
for (int j = 0; j < b.size(); i++) {
if (i == j) {
// llvm cannot eliminate exception call "out of range"
// gcc can
x = a.at(index);
index += 1;
break;
}
}
}
return x;
}
Godbolt: https://godbolt.org/z/sxGhMW
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