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[Bug target/69773] gcc ICE at -O2 and above on valid code on x86_64-linux-gnu in "assign_by_spills"
- From: "helloqirun at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 26 Feb 2016 23:00:08 +0000
- Subject: [Bug target/69773] gcc ICE at -O2 and above on valid code on x86_64-linux-gnu in "assign_by_spills"
- Auto-submitted: auto-generated
- References: <bug-69773-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69773
--- Comment #2 from Qirun Zhang <helloqirun at gmail dot com> ---
pr65693 fails to compile at -O0 with the same (similar) trace.
$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/home/absozero/trunk/root-gcc/libexec/gcc/x86_64-pc-linux-gnu/6.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/home/absozero/trunk/root-gcc
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 6.0.0 20160226 (experimental) [trunk revision 233763] (GCC)
$ gcc-trunk pr65693.c
pr65693.c: In function 'foo':
pr65693.c:13:1: error: unable to find a register to spill
}
^
pr65693.c:13:1: error: this is the insn:
(insn 11 35 12 2 (parallel [
(set (reg:DI 96)
(udiv:DI (reg:DI 94)
(reg:DI 106)))
(set (reg:DI 107 [97])
(umod:DI (reg:DI 94)
(reg:DI 106)))
(clobber (reg:CC 17 flags))
]) pr65693.c:10 358 {*udivmoddi4}
(expr_list:REG_UNUSED (reg:DI 107 [97])
(expr_list:REG_DEAD (reg:DI 106)
(expr_list:REG_DEAD (reg:DI 94)
(expr_list:REG_UNUSED (reg:CC 17 flags)
(nil))))))
pr65693.c:13:1: internal compiler error: in assign_by_spills, at
lra-assigns.c:1417
0xaf9138 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
../../gcc/gcc/rtl-error.c:108
0x9f4515 assign_by_spills
../../gcc/gcc/lra-assigns.c:1417
0x9f4bc3 lra_assign()
../../gcc/gcc/lra-assigns.c:1590
0x9f064b lra(_IO_FILE*)
../../gcc/gcc/lra.c:2331
0x9a76f9 do_reload
../../gcc/gcc/ira.c:5396
0x9a76f9 execute
../../gcc/gcc/ira.c:5567
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