https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55023
--- Comment #9 from dave.anglin at bell dot net ---
After some more digging, I think the problem is in dse, not dce. It
deletes this instruction
which stores part of the sibcall arguments:
(insn 31 27 50 2 (set (mem:SI (reg/f:SI 115) [0 S4 A64])
(reg:SI 125)) pr55023.c:17 40 {*pa.md:2204}
(expr_list:REG_DEAD (reg:SI 125)
(expr_list:REG_DEAD (reg/f:SI 115)
(nil))))
**scanning insn=31
mem: (reg/f:SI 115)
after canon_rtx address: (plus:SI (reg/f:SI 3 %r3)
(const_int -56 [0xffffffffffffffc8]))
gid=0 offset=-56
processing const base store gid=0[-56..-52)
trying store in insn=26 gid=0[-52..-48)
mems_found = 1, cannot_delete = false
[...]
Locally deleting insn 31
deferring deletion of insn with uid = 31.
Locally deleting insn 26
deferring deletion of insn with uid = 26.
The argument setup for this argument is:
(insn 25 22 26 2 (set (reg/f:SI 124)
(plus:SI (reg/f:SI 3 %r3)
(const_int -52 [0xffffffffffffffcc]))) pr55023.c:17 112
{addsi3}
(nil))
(insn 26 25 27 2 (set (mem:SI (reg/f:SI 124) [0 S4 A32])
(reg:SI 119 [ D.1503 ])) pr55023.c:17 40 {*pa.md:2204}
(expr_list:REG_DEAD (reg/f:SI 124)
(nil)))
(insn 27 26 31 2 (set (reg:SI 125)
(ashiftrt:SI (reg:SI 119 [ D.1503 ])
(const_int 31 [0x1f]))) pr55023.c:17 174 {*pa.md:6548}
(expr_list:REG_DEAD (reg:SI 119 [ D.1503 ])
(nil)))
(insn 31 27 50 2 (set (mem:SI (reg/f:SI 115) [0 S4 A64])
(reg:SI 125)) pr55023.c:17 40 {*pa.md:2204}
(expr_list:REG_DEAD (reg:SI 125)
(expr_list:REG_DEAD (reg/f:SI 115)
(nil))))
Pseudo "SI 115" was loaded earlier:
(insn 16 12 20 2 (set (reg/f:SI 115)
(plus:SI (reg/f:SI 3 %r3)
(const_int -56 [0xffffffffffffffc8]))) pr55023.c:16 112
{addsi3}
(nil))
Dave
--
John David Anglin dave.ang...@bell.net
