https://bugs.llvm.org/show_bug.cgi?id=47593
Bug ID: 47593
Summary: Failure to optimize bitwise not pattern
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: gabrav...@gmail.com
CC: llvm-bugs@lists.llvm.org
int f1(int a, int b)
{
return ~(a | b) | (~a & b);
}
This can be optimized to `return ~a;`. This optimization is done by GCC, but
not by LLVM.
See also comparison here : https://godbolt.org/z/vqTW4a
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