> > What happens in practice? GCC doesn't put functions in random > partitions. >
The data goes into a separate partition AFAIU - it means that all data accesses are as though they are extern references which means there's not necessarily any CSE'ing ability that's available with section anchors. >> If it's not desired by default could we gate it on an option ? >> AFIAU, section anchors optimization is important for ARM and AArch64. > > For code size or for performance? I wonder why section anchors cannot > be "implemented" using some special relocations and thus as linker > optimization. For performance (and probably code size too) as you can end up CSE'ing the anchor point. the difference in performance with -flto-partitions=1 is visible on quite a few of the spec2k benchmarks. I don't remember which ones immediately but yeah it makes a difference. Ramana > > Richard. >
