roy rosen <roy.1ro...@gmail.com> writes: > If I have two insns: > r2 = r3 > r3 = r4 > It seems to me that the dependency analysis creates a dependency > between the two and prevent parallelization. Although there is a > dependency (because of r3) I want GCC to parallelize them together. > Since if the insns are processed together the old value of r3 is used > for the first insn before it is written by the second insn. > How do I let GCC know about these things (When exactly each operand is > used and when it is written)? > Is it in these hooks? > In which port can I see a good example for that?
I was under the impression that an anti-dependence in the same cycle was permitted to execute. But perhaps I am mistaken. In the one significant VLIW port I did, I pulled the instructions together in the final pass. Ian
