https://bugs.llvm.org/show_bug.cgi?id=45691
Bug ID: 45691
Summary: Failure to detect abs pattern using multiplication
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
unsigned r(int v)
{
return (1 | -(v < 0)) * v;
}
`r` is equivalent to `abs(v)`. LLVM does not make the transformation to an
`abs`.
Example of the optimization not being done : https://godbolt.org/z/9Lwxoc
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