Richard,
thanks for your review and comments.
> On Oct 5, 2017, at 11:50 AM, Richard Earnshaw (lists)
> <richard.earns...@arm.com> wrote:
>
> On 25/09/17 17:35, Qing Zhao wrote:
>>
>> --- a/gcc/config/aarch64/aarch64.h
>> +++ b/gcc/config/aarch64/aarch64.h
>> @@ -782,7 +782,7 @@ typedef struct
>> /* Specify the machine mode that the hardware addresses have.
>> After generation of rtl, the compiler makes no further distinction
>> between pointers and any other objects of this machine mode. */
>> -#define Pmode DImode
>> +#define Pmode (TARGET_ILP32 ? SImode : DImode)
>
> This is wrong. AArch64 has both ptr_mode and Pmode. Pmode must always
> be DImode as (internally) all addresses must be 64-bit. ptr_mode
> reflects the ABI choice of 32/64-bit language level addresses. The
> register SP must always be a 64-bit value, even when all the top 32 bits
> are zero.
So, in ilp32 ABI, compared to LP64, the only difference is:
long and pointer size are different
all the others are the same, including:
registers size are 64 bits for both ilp32 and LP64.
stack poping and pushing by 64 bits for both ilp32 and LP64.
is the above right?
what’s the other difference between ilp32 and LP64?
thanks a lot for your help.
Qing
