[llvm-bugs] [Bug 26026] New: Constant vectors do not support ConstantExprs

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26026

            Bug ID: 26026
           Summary: Constant vectors do not support ConstantExprs
           Product: libraries
           Version: trunk
          Hardware: Macintosh
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Interpreter
          Assignee: unassignedbugs at nondot.org
          Reporter: btaylor at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 15558
  --> https://llvm.org/bugs/attachment.cgi?id=15558&action=edit
Patch to enable ConsantExpr evaluation for constant vectors

I am working on a project that uses integer vectors fairly extensively. Some
values in the vectors came from constant pointers cast to 64-bit integers, and
the LLVM optimizer would often end up folding values into instructions that
looked like this:

store <2 x i64> <i64 ptrtoint (... constant_pointer_value ... to i64), i64 0>,
<2 x i64>* %f

ExecutionEngine aborts at runtime on all instructions like this because
ExecutionEngine::getConstantValue assumes all vector constants are "simple
constants" whose values are ConstantInts, not handling the case of
ConstantExpr.

I attached a patch, which you can also see in my git branch here -
https://github.com/finiteloop/llvm/commit/a7ad5bdbbab509d2a7d8c5af35e436e2b72730c4

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