------- Comment #4 from jakub at gcc dot gnu dot org 2010-03-19 17:35 -------
Ah, I see. We have
(insn/f 93 8 94 2 pr43437.c:4 (parallel [
(set/f (mem:SI (pre_dec:SI (reg/f:SI 0 r0)) [0 S4 A32])
(reg:SI 12 r12))
(set/f (mem:SI (pre_dec:SI (reg/f:SI 0 r0)) [0 S4 A32])
(reg:SI 13 r13))
(set/f (mem:SI (pre_dec:SI (reg/f:SI 0 r0)) [0 S4 A32])
(reg:SI 14 r14))
(set/f (mem:SI (pre_dec:SI (reg/f:SI 0 r0)) [0 S4 A32])
(reg:SI 15 r15))
]) 159 {*score.md:3032} (expr_list:REG_DEAD (reg:SI 15 r15)
(expr_list:REG_DEAD (reg:SI 14 r14)
(expr_list:REG_DEAD (reg:SI 13 r13)
(expr_list:REG_DEAD (reg:SI 12 r12)
(nil))))))
and adjust_insn turns that into:
(insn/f 93 8 94 2 pr43437.c:4 (parallel [
(set/f (mem:SI (plus:SI (reg/f:SI 54 _frame)
(const_int -20 [0xffffffffffffffec])) [0 S4 A32])
(reg:SI 12 r12))
(set/f (mem:SI (plus:SI (reg/f:SI 54 _frame)
(const_int -20 [0xffffffffffffffec])) [0 S4 A32])
(reg:SI 13 r13))
(set/f (mem:SI (plus:SI (reg/f:SI 54 _frame)
(const_int -20 [0xffffffffffffffec])) [0 S4 A32])
(reg:SI 14 r14))
(set/f (mem:SI (plus:SI (reg/f:SI 54 _frame)
(const_int -20 [0xffffffffffffffec])) [0 S4 A32])
(reg:SI 15 r15))
(set (reg/f:SI 0 r0)
(plus:SI (reg/f:SI 0 r0)
(const_int -4 [0xfffffffffffffffc])))
(set (reg/f:SI 0 r0)
(plus:SI (reg/f:SI 0 r0)
(const_int -4 [0xfffffffffffffffc])))
(set (reg/f:SI 0 r0)
(plus:SI (reg/f:SI 0 r0)
(const_int -4 [0xfffffffffffffffc])))
(set (reg/f:SI 0 r0)
(plus:SI (reg/f:SI 0 r0)
(const_int -4 [0xfffffffffffffffc])))
]) 159 {*score.md:3032} (expr_list:REG_DEAD (reg:SI 15 r15)
(expr_list:REG_DEAD (reg:SI 14 r14)
(expr_list:REG_DEAD (reg:SI 13 r13)
(expr_list:REG_DEAD (reg:SI 12 r12)
(nil))))))
I was assuming more than one autoinc with the same reg doesn't appear in any
port, apparently it does. Guess adjust_insn could detect this and merge all
the adjustments against the same reg into one.
--
jakub at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |jakub at gcc dot gnu dot org
|dot org |
Status|NEW |ASSIGNED
Last reconfirmed|2010-03-19 15:58:32 |2010-03-19 17:35:01
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43437
