Hi,
Below is a c program.
Gcc-4.1.2 is unable to produce vector code for it
because the induction varible(int i) decreases.
But if the (for)loop is modified as
for(i=0;i<n;i++){...................}
gcc will produce vector code.
During the autovectorization pass, the program will
be in SSA form.
My question is how to do the above transformation on
SSA form of a program??
Can anyone help me?
Thanks in advance.
******************************************************
1 #include<stdio.h>
2 int main()
3 {
4 int i,k;
5 int a[100],b[100],n=80;
6
7
8 for(i=n;i>0;i--)
9 {
10 a[i+1]=b[i+12]-3;
11 b[i+1]=a[i+7]*5;
12 }
13
14 printf("\n %d ",a[22]);
15 }
*****************************************************
--- Anitha Boyapati <anithab@xxxxxxxxxxx> wrote:
>
> Hi,
>
>
> > Is it possible to modify the code at SSA level of
> a
> > program.
>
> Which code ? Being a little more precise can save
> lot of trouble
> to others in repeatedly asking where/why/what/how
> or might even consider
> giving it a thought before throwing it away :)
>
> > Modifications are like introducing a new variable
> and
> > assigning some value to it ......so on.
> >
> > If so, in which file those functions are availble?
> > Thanks in advance.
> >
> >
> >
> >
>
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> >
>
> --
> Regards,
> Anitha B
> @S A N K H Y A
>
>
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