The rtl epilogues are inserted after the USE which indicates where
the return value is. As a result, an instruction that calculates the
return value cannot be placed in the delay slot of the return
instruction. That is something that we did get right when we
had non-rtl epilogues - the epilogue_delay could well contain an insn to
calculate
the function result.
--
Summary: rtl epilogues worse than non-rtl epilogues for dbr
scheduling
Product: gcc
Version: 4.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: amylaar at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38267
