2c2d405829
Compared to the cc0 version, I noticed a regression in delay-slot-filling for CRIS for several functions in libgcc with a similar layout, one being lshrdi3, where with cc0 all delay-slots were filled, as exposed by the test-case in gcc.target/cris/pr93372-1.c. There's one slot that fails to be filled for the decc0rated CRIS port. A gdb session shows it is because of the automatic inclusion of TARGET_FLAGS_REGNUM in "registers needed at the end of the function" because there are insns in the epilogue that clobber the condition-code register. I'm not trying to tell a clobber from a set, as parallels with set instead of clobber seems likely to happen too, for targets with TARGET_FLAGS_REGNUM set. Other targets with delay-slots and one dedicated often-clobbered condition-code-register should consider defining TARGET_FLAGS_REGNUM. I noticed it improved delay-slot-filling also in other situations than this. (Previously approved by Jeff Law.) gcc: * resource.c (init_resource_info): Filter-out TARGET_FLAGS_REGNUM from end_of_function_needs. |
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