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Message
From: y_chi_wai2003@y...<y_chi_wai2003@y...>
Date: Tue Jun 15 04:08:54 CEST 2004
Subject: [openrisc] Compiling the source code with large static array size
Thank you very much for your answer !!I tried to use :
static int aii[100000];
the following assembly code generated :
00002000 <_main>:
2000: 9c 21 ff d0 l.addi r1,r1,0xffffffd0
2004: d4 01 48 00 l.sw 0x0(r1),r9
2008: d4 01 50 04 l.sw 0x4(r1),r10
200c: d4 01 60 08 l.sw 0x8(r1),r12
The error
"EXCEPTION: write out of memory (32-bit access to > fffff2ec)" didn't
occur anymore .
Do you know where the static array aii will be stored (in the memory) ?
It shouldn't be stored in stack ?
Thanks !!
Regards,
Yu Chi Wai
----- Original Message -----
From: Matjaz Breskvar<phoenix@o...>
To:
Date: Mon Jun 14 10:24:52 CEST 2004
Subject: [openrisc] Compiling the source code with large static
array size
> * y_chi_wai2003@y... (y_chi_wai2003@y...) wrote:
> > Dear all,
> > I encounterred a problem when compiling the source code using
> or32-
> > gcc and simulating in or32 simulator.
> >
> > When I created a large static array , e.g :
> >
> > int main()
> > {
> > int aii[100000];
> > int i;
> >
> > for (i=0 ; i<100000; i ++)
> > {
> > aii[i+1]
> > }
> > ........
> > return 0;
> > }
> >
> > After compiled the source code and got the Assembley code :
> >
> > 00002000 <_main>:
> > 2000: 19 60 00 01 l.movhi r11,0x1
> > 2004: a9 6b 3a 30 l.ori r11,r11,0x3a30
> > 2008: e0 21 58 02 l.sub r1,r1,r11
> > 200c: d4 01 48 00 l.sw 0x0(r1),r9
> > 2010: d4 01 50 04 l.sw 0x4(r1),r10
> > 2014: d4 01 60 08 l.sw 0x8(r1),r12
> > 2018: d4 01 70 0c l.sw 0xc(r1),r14
> > 201c: d4 01 80 10 l.sw 0x10(r1),r16
> > 2020: d4 01 90 14 l.sw 0x14(r1),r18
> > 2024: d4 01 a0 18 l.sw 0x18(r1),r20
> > 2028: d4 01 b0 1c l.sw 0x1c(r1),r22
> >
> > .....................
> >
> > The series of l.sw instructions were not belong to my
> "for loop".
> > While did simulation until the instruction "l.sw
> 0x0(r1),r9", the value of
> > register "r1" became very large (== fffff2e8). The
> simulation gave error
> > message "EXCEPTION: write out of memory (32-bit access to
> fffff2ec)"
> >
> > Do anyone know the use of these l.sw instructions ? And how to
> limit
> > the register "r1" 's value not become too large
> during compilation ?
> >
> > Thank you very much !
> you busted the stack. aii[100000] was allocated on stack, but there
> wasn't
> that much space. (stack grows down)... try enlarging the stack
> or use dynamic allocation...
> regards,
> p.
>
>
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