https://bugs.llvm.org/show_bug.cgi?id=51784
Bug ID: 51784
Summary: [InstCombine] Failure to fold ctpop(( v & -v ) - 1) ->
cttz(v, 0)
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected]
https://alive2.llvm.org/ce/z/kopg8_
define i8 @src(i8 %0) {
%1:
%2 = sub i8 0, %0
%3 = and i8 %2, %0
%4 = add i8 %3, -1
%5 = ctpop i8 %4
ret i8 %5
}
=>
define i8 @tgt(i8 %0) {
%1:
%2 = cttz i8 %0, 0
ret i8 %2
}
Transformation seems to be correct!
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