http://llvm.org/bugs/show_bug.cgi?id=19753
Bug ID: 19753
Summary: InstCombine: constant comparison involving "ashr
exact" not optimized well
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
consider:
define i1 @exact_ashr_eq_false(i32 %a) {
%shr = ashr exact i32 -30, %a
%cmp = icmp eq i32 %shr, -15
ret i1 %cmp
}
I think this should just be:
define i1 @exact_ashr_eq_false(i32 %a) {
%cmp = icmp eq i32 %a, 1
ret i1 %cmp
}
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