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Message
From: y_chi_wai2003@y...<y_chi_wai2003@y...>
Date: Mon Jun 14 09:47:42 CEST 2004
Subject: [openrisc] Compiling the source code with large static array size
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 !
Regards,
Yu Chi Wai
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