[llvm-bugs] [Bug 30658] New: Clang should support gcc's __builtin_alloca_with_align()

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30658

            Bug ID: 30658
           Summary: Clang should support gcc's
                    __builtin_alloca_with_align()
           Product: clang
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: jobstz at yahoo.de
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Clang already supports __builtin_alloca() but not with an extra alignment
specifier.
IMHO this function without alignment guarantees is almost useless, because e.g
it is inherently unsafe to attempt to stuff a c++ type into the allocated
memory.
Trying to implement this function outside of the compiler stack is also not a
good idea, because it is by nature very platform dependent and any efficient
implementation would have to use inline assembly.
Still the function is abstract enough to be supported on most machines (just as
__buitin_alloca()) so that it makes sense to insert into the compiler.

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