Ian Lance Taylor-3 wrote:
>
> noeljohn <noel.daniel@xxxxxxx> writes:
>
>> Ian Lance Taylor-3 wrote:
>>>
>>> noeljohn <noel.daniel@xxxxxxx> writes:
>>>
>>>> The array as I have seen is not being treated as a vector. What it
>>>> does
>>>> is
>>>> it directly loads the integer array data into the stack. This is
>>>> normally
>>>> done for processors which does not have a support for multiple loading
>>>> and
>>>> storing of words. Is there any way by which we can convey gcc through
>>>> macros
>>>> that our architecture supports this multiple loading and storing
>>>> facility?
>>>
>>> I'm sorry, I don't understand what you mean. What specific
>>> instruction are you trying to generate, and what precisely does it do?
>>> When exact C code would you write that you would expect to generate
>>> this instruction?
>>>
>>> Ian
>>>
>>>
>>
>> Hello Sir,
>> The actual problem is that the array contents are not put in a
>> separate
>> data section we would see in .s file. Suppose we take a arm processor or
>> rs6000 processor, a separate section will be created in which the array
>> contents will be stored and then these array contents are loaded into the
>> stack. I want this data section to be created. How should I go forward ?
>
>
> Give us an example. Show us some source code.
>
> Ian
>
>
.file "1234.c"
.section .rodata
.align 2
.type C.0.1175, %object
.size C.0.1175, 20
C.0.1175:
.word 6
.word 9
.word 5
.word 6
.word 8
.text
.align 2
.global main
.type main, %function
main:
@ args = 0, pretend = 0, frame = 20
@ frame_needed = 1, uses_anonymous_args = 0
mov ip, sp
stmfd sp!, {r4, fp, ip, lr, pc}
sub fp, ip, #4
sub sp, sp, #20
ldr r3, .L3
sub r4, fp, #36
mov ip, r3
ldmia ip!, {r0, r1, r2, r3}
stmia r4!, {r0, r1, r2, r3}
ldr r3, [ip, #0]
str r3, [r4, #0]
ldr r2, [fp, #-28]
ldr r3, [fp, #-20]
and r3, r2, r3
str r3, [fp, #-24]
sub sp, fp, #16
ldmfd sp, {r4, fp, sp, pc}
.L4:
.align 2
.L3:
.word C.0.1175
.size main, .-main
.ident "GCC: (GNU) 4.3.0"
This is the arm assembly for the c program:
void main()
{
int a[5]={6,9,5,6,8};
a[3]=a[2] & a[4];
}
The section below is the one which needs to be generated for the machine
which I am working for.
.section .rodata
.align 2
.type C.0.1175, %object
.size C.0.1175, 20
C.0.1175:
.word 6
.word 9
.word 5
.word 6
.word 8
Similar section is seen for the assembly generated by the machine powerpc.
How can it be generated?
noeljohn
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