[LLVMdev] Runtime alignment

[Nick Lewycky]

On 24 September 2014 15:09, Mark Boyall <wolfeinstein at gmail.com> wrote:

> For the size of a type to be calculated at runtime, there is a known trick
> with gep. Is there any similar trick for determining the alignment of a
> type at runtime for target-independent IR?
>

There's ConstantExpr::getAlignOf to go with getSizeOf and getOffsetOf. The
implementation has this comment:

  // alignof is implemented as: (i64) gep ({i1,Ty}*)null, 0, 1
  // Note that a non-inbounds gep is used, as null isn't within any object.

Nick
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