is this AMD64 ABI or generic X8664 ABI? I guess I don't know much
about Intel vs AMD ABI differences, if there is.
Sun
On Tue, May 17, 2011 at 8:01 AM, David Coakley <dcoak...@gmail.com> wrote:
> (Attachment added this time.)
>
> On Mon, May 16, 2011 at 5:01 PM, David Coakley <dcoak...@gmail.com> wrote:
>> Could a gatekeeper review the attached patch? It fixes some AMD64 ABI
>> compatibility problems and also eliminates some unnecessary struct
>> copies. The second part should apply to all targets.
>>
>> Here is the proposed log message:
>>
>>
>> Improve AMD64 ABI compliance and avoid unnecessary struct copies.
>>
>> For the following code, the compiler generated unnecessary struct copies
>> for a return value that has a size too big to be passed in registers.
>>
>> typedef struct { char big[1024]; } C;
>> C gc;
>> extern C bar9 (void);
>> extern C check9 (void) { return bar9 (); }
>>
>> In this case there were two copies and one temporary variable generated.
>> After this change the compiler does not generate any extra copies.
>>
>> According to the AMD64 ABI, the caller provides space for the return
>> value in a hidden first argument and this address is returned in %rax.
>> Previously the compiler was not following this rule.
>>
>> The change handles the similar cases of initialization by function
>> call ("C c = bar9();") and assignment to a pointer ("*cp = bar9()").
>>
>> Also, a complex long double field is now returned in the register pair
>> (%st0, %st1) as specified by the AMD64 ABI.
>>
>>
>>
>> I am still looking for a review for the patch I posted last week (May
>> 10) as well. Thanks,
>>
>> -David Coakley / AMD Open Source Compiler Engineering
>>
>
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