llvm-project/llvm/test/CodeGen/PowerPC/cttz.ll

; Make sure this testcase does not use ctpop
; RUN: llc < %s -march=ppc32 | grep -i cntlzw

declare i32 @llvm.cttz.i32(i32, i1)

define i32 @bar(i32 %x) {
entry:
        %tmp.1 = call i32 @llvm.cttz.i32( i32 %x, i1 true )              ; <i32> [#uses=1]
        ret i32 %tmp.1
}