Ian Lance Taylor <ian@airs.com> writes: > 3) Write a new CC0 collapse pass. This pass is run immediately > after RTL expansion. It walks the instruction stream looking for > instructions which set and use CC_REG. At this point these > instructions will always be adjacent. The pass combines them into > the combined instruction defined in step 2c above.
I'm not understanding why this is a separate pass, instead of generating the combined instructions directly in the expander. I think generic expander support for compare-and-branch instructions already exists... zw
