https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63618
Bug ID: 63618
Summary: CSE at IRA pass delete SET_GOT which is used later
Product: gcc
Version: 5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: evstupac at gmail dot com
Test failed on execution compiled with:
gcc elim_set_got.c -fPIE -m32 -msse4.2 -O2 -fno-inline -mtune=corei7
./a.out
Segmentation fault (core dumped)
That occurs because CSE delete SET_GOT at IRA as it has no uses.
However the instruction:
(insn 20 17 21 3 (set (mem:TF (pre_dec:SI (reg/f:SI 7 sp)) [2 S16 A128])
(const_double:TF 1.0e+9 [0x0.ee6b28p+30])) elim_setgot.c:26 121
{*pushtf}
(expr_list:REG_ARGS_SIZE (const_int 16 [0x10])
(nil)))
have hidden use of GOT register as it is split into:
(insn 45 47 46 3 (set (reg:SI 0 ax [92])
(plus:SI (reg:SI 0 ax [87])
(const:SI (unspec:SI [
(symbol_ref/u:SI ("*.LC2") [flags 0x2])
] UNSPEC_GOTOFF)))) elim_setgot.c:26 213 {*leasi}
(expr_list:REG_EQUAL (symbol_ref/u:SI ("*.LC2") [flags 0x2])
(nil)))
(insn 46 45 20 3 (set (reg:TF 23 xmm2 [93])
(mem/u/c:TF (reg:SI 0 ax [92]) [2 S16 A128])) elim_setgot.c:26 126
{*movtf_internal}
(nil))
