https://llvm.org/bugs/show_bug.cgi?id=31802
Bug ID: 31802
Summary: Count Leading Ones does not work properly on ARMv8
(should lower to CLS) ?
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangb...@nondot.org
Reporter: gonzalob...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
One can implement count leading ones (or count leading significant bits) as
follows:
unsigned cls(unsigned i) {
return __builtint_clz(!i);
}
I would expect this code to generate the cls instruction on aarch64 but i don't
seem to be able to generate this instruction at all.
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