Hello all, For the 16-bit target that i porting now to gcc 4.1.2 doesn't have any branch instructions. It only has jump instructions. For comparison operation it has this instruction:
if cond Rx Ry execute this insn So compare and branch is implemented as if cond Rx Ry jmp Label If the condition in the 'if' instruction is satisfied the processor will execute the next instruction or it will replace with a nop. So this means that i can instructions similar to: if eq Rx, Ry add Rx, Ry add Rx, 2 This is similar to conditional execution. This way any instruction can be executed conditionally. But this is different from normal. Normally the comparison operations set the status flags. An instruction gets conditionally executed based on these flags. This means that GCC can schedule instructions between the comparison instruction and the conditional instruction, provided none of the scheduled instructions are altering the status flags. This is not possible in my case as there shouldn't be any instruction between 'if eq Rx, Ry' and 'add Rx, Ry' and this is not as such an comparison operation and 'if' instruction doesn't set any status flags. Will it be possible to implement this in the Gcc backend ? Does any other targets have similar instructions? Regards, Shafi
