https://bugs.llvm.org/show_bug.cgi?id=48038
Bug ID: 48038
Summary: Clang fails to optimise loop invariant when function
accesses class members
Product: new-bugs
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Repro is here:
https://godbolt.org/z/Y8397j
Essentially we're seeing a division in every loop iteration for the trivial
HanningWindow::prepare1 case.
If we cache the flow_ and fhigh_ class members (HanningWindow::prepare2), the
invariant gets optimised.
Same if we extract the function (prepareExternal)
prepare1 => .LBB1_2: doesn't get optimised
prepare2 => .LBB2_2: works as expected
prepareExternal => .LBB3_2 works as expected
Any ideas why this happens? Is this something that can be fixed?
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