http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54602
Oleg Endo <olegendo at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2012-10-09
Ever Confirmed|0 |1
--- Comment #1 from Oleg Endo <olegendo at gcc dot gnu.org> 2012-10-09 22:52:19
UTC ---
The problem is the "*movsi_pop" insn. It prevents delay-slot stuffing of pop
insns on everything < SH3. This was probably added to avoid pop insns in
interrupt handler functions, which return with 'rte' instead of 'rts', see PR
53689.
Adding "&& current_function_interrupt" to the condition of the "*movsi_pop"
insn fixes the problem, while maintaining correct code for interrupt handler
functions.
There is also the following in sh.md:
(define_delay
(eq_attr "type" "return")
[(and (eq_attr "in_delay_slot" "yes")
(ior (and (eq_attr "interrupt_function" "no")
(eq_attr "type" "!pload,prset"))
(and (eq_attr "interrupt_function" "yes")
(ior
(not (match_test "TARGET_SH3"))
(eq_attr "hit_stack" "no")
(eq_attr "banked" "no"))))) (nil) (nil)])
which should actually prevent normal movsi pop insn from slipping into the
delay slot. I've tapped the "hit_stack" test and it is not invoked for
interrupt functions for some reason ....
