[llvm-bugs] [Bug 25588] New: SafeStack missing alignment for Dynamic Alloca

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=25588

            Bug ID: 25588
           Summary: SafeStack missing alignment for Dynamic Alloca
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Miscellaneous Instrumentation passes
          Assignee: unassignedbugs at nondot.org
          Reporter: hal_ler at yahoo.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

When moving a Dynamic Alloca to the SafeStack the unaligned base is used (SP,
the result of the subtract: Value *NewAI = IRB.CreateIntToPtr(SP,
AI->getType())) ignoring the previous alignment setting.

The code should just align SP using the existing code (IRB.CreateAnd(SP,
ConstantInt::get(IntPtrTy, ~uint64_t(Align - 1)))) and use that further for
NewTop and NewAI.

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