[llvm-commits] PATCH: Use modules data layout over subtargetdata layout, if it exists.

[Chris Lattner]

On Feb 18, 2009, at 2:31 PM, Burke, Max wrote:

> Re patches, will do.
>
> I'm trying to fix interop between code that LLVM generates and that
> generated by a few other compilers on a handful of platforms which  
> have
> differing alignments than what LLVM specifies, without hard coding the
> permutations into the backends.

Ok, currently that is considered a front-end problem.  :)

A silly example, say your C compile expects double to be 8-byte  
aligned, and you have the following struct:

struct {
   int X;
   double D;
};

This will get codegen'd by llvm-gcc to { i32, i32, double }, not to  
{i32, double} on targets where the llvm backend thinks that double is  
4-byte aligned.

-Chris