On Sun, May 12, 2019 at 10:07:28PM -0500, Jiufu Guo wrote: > To elimiate the instructions which moving result of CMP to GPR, I'm > wondering maybe we could do a combine(or a peephole) after bbro to let > the condition jump directly using the result of CMP.
It will have to be a peephole. And peepholes are machine-specific. You will also not get any further optimisations in those blocks, that way; not combine etc. It really should be done on gimple, not rtl. Segher
