https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86979
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |abel at gcc dot gnu.org,
| |amonakov at gcc dot gnu.org
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Aha, I had to use -fpic additionally in my cross.
Seems like sel-sched bug to me.
In *.split4 we still have correct:
(insn/f 71 9 72 2 (parallel [
(set (reg/f:SI 7 sp)
(plus:SI (reg/f:SI 7 sp)
(const_int -12 [0xfffffffffffffff4])))
(clobber (reg:CC 17 flags))
(clobber (mem:BLK (scratch) [0 A8]))
]) "pr69102.c":8:1 954 {pro_epilogue_adjust_stack_si_add}
(expr_list:REG_UNUSED (reg:CC 17 flags)
(expr_list:REG_CFA_ADJUST_CFA (set (reg/f:SI 7 sp)
(plus:SI (reg/f:SI 7 sp)
(const_int -12 [0xfffffffffffffff4])))
(nil))))
in prologue at the start of function, then body including a tablejump and
finally
(insn 48 47 49 5 (parallel [
(set (reg/f:SI 7 sp)
(plus:SI (reg/f:SI 7 sp)
(const_int -12 [0xfffffffffffffff4])))
(clobber (reg:CC 17 flags))
]) "pr69102.c":22:3 190 {*addsi_1}
(expr_list:REG_UNUSED (reg:CC 17 flags)
(expr_list:REG_ARGS_SIZE (const_int 12 [0xc])
(nil))))
(insn 49 48 50 5 (set (mem:SI (pre_dec:SI (reg/f:SI 7 sp)) [1 S4 A32])
(reg/v:SI 0 ax [orig:84 ch ] [84])) "pr69102.c":22:3 43 {*pushsi2}
(expr_list:REG_DEAD (reg/v:SI 0 ax [orig:84 ch ] [84])
(expr_list:REG_ARGS_SIZE (const_int 16 [0x10])
(nil))))
(call_insn 50 49 73 5 (call (mem:QI (symbol_ref:SI ("bar") [flags 0x41]
<function_decl 0x7f9013919900 bar>) [0 bar S1 A8])
(const_int 16 [0x10])) "pr69102.c":22:3 663 {*call}
(nil)
(nil))
(note 73 50 74 5 NOTE_INSN_EPILOGUE_BEG)
(insn/f 74 73 75 5 (parallel [
(set (reg/f:SI 7 sp)
(plus:SI (reg/f:SI 7 sp)
(const_int 28 [0x1c])))
(clobber (reg:CC 17 flags))
(clobber (mem:BLK (scratch) [0 A8]))
]) "pr69102.c":23:1 954 {pro_epilogue_adjust_stack_si_add}
(expr_list:REG_ARGS_SIZE (const_int 0 [0])
(expr_list:REG_UNUSED (reg:CC 17 flags)
(expr_list:REG_CFA_ADJUST_CFA (set (reg/f:SI 7 sp)
(plus:SI (reg/f:SI 7 sp)
(const_int 12 [0xc])))
(nil)))))
(jump_insn 75 74 78 5 (simple_return) "pr69102.c":23:1 686
{simple_return_internal}
(nil)
as the only stack-changing instructions. But sel-sched for some reason copies
the sp adjustment (insn 48) above to a different basic block before the
tablejump and due to that copy there is a basic block reachable from code with
different stack depths (i.e. different CFA offset), the initial one from right
after the prologue and the adjusted one due to this sel-sched bug.
