https://bugs.llvm.org/show_bug.cgi?id=44426
Bug ID: 44426
Summary: [InstCombine] sub (select %c, %x, %y), %x -> select
%c, 0, (sub %y, %x)
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]
Name: sub (select %c, %x, %y), %x -> select %c, 0, (sub %y, %x)
%o = select i1 %c, i64 %x, i64 %y
%r = sub i64 %o, %x
=>
%n = sub i64 %y, %x
%r = select i1 %c, i64 0, i64 %n
https://rise4fun.com/Alive/D5U
This can allow further folding to happen:
https://godbolt.org/z/atBtSx
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