[llvm-bugs] [Bug 40644] New: Miscompile of indexed floating point constant store

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=40644

            Bug ID: 40644
           Summary: Miscompile of indexed floating point constant store
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: jonathanchesterfield at gmail.com
                CC: llvm-bugs at lists.llvm.org

replaceStoreOfFPConstant called from DAGCombine replaces stores of floating
point constants with stores of integer constants without considering whether it
is an indexed or truncating store.

LegalizeDAG has the same oversight in OptimizeFloatStore.

A simple !isNormalStore() return would fix either, or a more comprehensive fix
would be to recreate indexed/truncating stores.

Thanks!

Jon

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