https://bugs.llvm.org/show_bug.cgi?id=44427
Bug ID: 44427
Summary: [InstCombine] sub (and %x, -16), %x -> 0-(and %x, 15)
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Looks like missed canonicalization to me. Not sure how much matters overall.
Name: sub (and %x, -16), %x -> 0-(and %x, 15)
Pre: isPowerOf2OrZero(-C1)
%o = and i64 %x, C1
%r = sub i64 %o, %x
=>
%n = and i64 %x, (-C1-1)
%r = sub i64 0, %n
https://rise4fun.com/Alive/t0hD
https://godbolt.org/z/R_RMfM
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