https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113255
--- Comment #3 from Uroš Bizjak <ubizjak at gmail dot com> ---
_.dse1 pass is removing the store for some reason, -fno-dse "fixes" the
testcase.
Before _.dse1 pass, we have:
(insn 41 40 46 4 (set (mem/c:SI (plus:DI (reg/f:DI 19 frame)
(const_int -36 [0xffffffffffffffdc])) [2 e[1].y+0 S4 A32])
(reg:SI 98 [ e$1$y ])) "pr113255.c":21:9 85 {*movsi_internal}
(expr_list:REG_DEAD (reg:SI 98 [ e$1$y ])
(nil)))
But _.dse1 pass decides that:
**scanning insn=41
mem: (plus:DI (reg/f:DI 19 frame)
(const_int -36 [0xffffffffffffffdc]))
after canon_rtx address: (plus:DI (reg/f:DI 19 frame)
(const_int -36 [0xffffffffffffffdc]))
gid=1 offset=-36
processing const base store gid=1[-36..-32)
mems_found = 1, cannot_delete = false
...
Locally deleting insn 41
deferring deletion of insn with uid = 41.
