[PATCH] - Use of powerpc 64bit instructions in 32bit ABI

[Eric Botcazou]

> 	I can try to look at the number of elements of the rtvec.

Thanks.

> 	Your second suggestion contradicts the purpose of the change
> explained in the comment: "Objects the size of a register can be combined
> in registers."

Then I'd suggest to clarify the comment, using....

> This specifically change is trying to optimize the case where a 64-bit or
> larger object is passed in multiple 32-bit blocks (due to the ABI), but
> will operate on the object within the function in a wider mode.  The
> compiler should combine the blocks using register operations, not memory
> operations.  Without the change, GCC would choose to use the
> stack to reconstitute the object, which is inefficient on modern
> architectures.  The standard example is "long long", but this also can and
> should apply to 128-bit TImode on PPC64, as well as other architectures.

...this clear explanation as the basis.

-- 
Eric Botcazou