The GCC internals explicitly introduced code manipulation APIs in TREE
representation (bsi_insert_before, bsi_remove etc). But I did not see the
equivalent for RTL representation.
Say, I want to enable a counter for a n-depth-nested loop. For example, I
want to add a counter instruction to count 2-depth-nested loop, then I need
to transform the following code as shown.
------------before transformation-------------------------
for (i=0; i< 5; i++ ){
for(j=0; j< 5; j++{
sum = sum+j;
}
}
-----------after transformation-------------------------
for (i=0; i< 5; i++ ){
for(j=0; j< 5; j++{
sum = sum+j;
}
}
counter++;
I found the following struct seemlessly provides information for above
purpose.
struct loop{
...
int depth;
rtx end;
}
i.e., it seems that I can simply do something like the following as long as
there is an API to manipulate RTL representation.
if (this_loop.depth ==2){
insert_after(this_loop.end);
}
Would you please kindly give me some hint to find out such APIs(I am sure
there is somewhere)? Thanks a lot.
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