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Message
From: Matjaz Breskvar<phoenix@o...>
Date: Fri Sep 17 12:55:14 CEST 2004
Subject: [openrisc] how to make the division?
* beyoelf@1... (beyoelf@1...) wrote:
> I met some questions when compiling a C file:
> In one function ,I had to make recursion as follows:
> int schur(
> int * ac, int * ref)
> {
> int i,m,r,energy = ac[0];
> int G[2][P_MAX];
>
> if (ac[0] == 0)
> { for (i = 0; i < P_MAX; i++) ref[i] = 0;
> return 0;
> }
>
> for (i = 0; i < P_MAX; i++) G[0][i] = G[1][i] = ac[i + 1];
>
> for (i = 0;;)
> { ref[i] = r = -G[1][0]*/energy; // Here is the mistake!!!!
>
> energy += (G[1][0] * r);
>
> if (++i >= P_MAX) return error;
>
> for (m = 0; m < P_MAX - i; m++)
> { G[1][m] = G[1][m + 1] + r * G[0][m];
> G[0][m] = G[1][m + 1] * r+ G[0][m];
> }
> }
> }
> because the variable "energy" isn't the power of 2, the error comes
> when compiling: recorder.o :in function'__schur':
> recorder.o(.text+0x7b0): undefined referrence to '___divsi3'
> make ***(recorder) error 1
> but the variable 'energy ' changes every recursion, it's hard to set the
> power of 2 to approach 'energy'. How can i do ? Is it has some *.lib or
> *.h to be included to solve the problem? thank you
simple, you need to link with libgcc.a (the or32 version of course).
iy you have hardware division you can also pass -mhard-div option to
compiler and it will generate l.div instruction instead of using ___div*
functions.
best reagards,
p.
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