Hi, SMS transformation would change kernel loop iteration count as new_loop_count = ori_loop_count - stage_count.
With doloop optimization, loop_count will hold in count_reg
in loop entry.
The loop count adjustment instruction could generate as
count_reg = count_reg - stage_count
before entry the loop
or modify the loop count initial instruction
if loop count could know while compile time
count_reg = new_loop_count_constant
To remove the dependency on doloop pass, we need to generate
loop adjustment instruction without doloop pass.
Without doloop pass, there might have count_reg reference
instruction in the loop. Therefore, we couldn't modify
loop count initial value to adjust loop count.
If there is count_reg reference in the loop, we modify loop
end condition to adjust loop count.
Function loop_iteration_adjust_by_replace in the patch try to
replace constant end condition in comparison instruction.
Function gen_loop_iteration_adjust in the patch will generate
loop end condition adjustment instruction if loop end condition
hold in a register.
If there is no count_reg reference in the loop, we will modify
loop count initial value as before.
Thanks,
Shiva
0004-update-kernel-loop-iteration-adjustment-instruction-.patch
Description: 0004-update-kernel-loop-iteration-adjustment-instruction-.patch
