https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77498
Bug ID: 77498 Summary: [7 regression] Performance drop after r239414 on spec2000/172mgrid Product: gcc Version: 7.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: ysrumyan at gmail dot com Target Milestone: --- We noticed significant regression after https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=239414 I attached simple routine to reproduce. We can see that register pressure is 2x higher with this patch after pre. The regression is worse for 32-bit mode.