rohitgeek <rohit23taneja@xxxxxxxxx> writes: > 1. Created the machine description files > 2. Build my target (successful) > 3. Compile > Now this step works correctly i.e. generate correct assembly if i do > not put any optimization option. > > command : ---- ./target-gcc -S test.c -> works > ./target-gcc -O1/2/3 -S test.c -> no > assembly corresponding to the variable assignment and all other operations > i.e. it generates only prologue and epilogue(if i am correct for later > part). You didn't show us test.c. You have to tell us what you did if you expect a good answer to your question. Without seeing test.c, I would guess that the variables are not used, and were removed by the optimizers. > Give me some insight into working of peephole optimizations, how do i start > doing that. Peephole optimization is a specific type of optimization. See define_peephole and define_peephole2 in the internals documentation. See many examples in the existing backends. Ian
