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Message
From: Matjaz Breskvar<phoenix@o...>
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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