https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83467
Bug ID: 83467
Summary: [7/8 Regression] ICE: in assign_by_spills, at
lra-assigns.c:1476: unable to find a register to spill
with -flive-range-shrinkage -m8bit-idiv
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: ice-checking
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: zsojka at seznam dot cz
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Target: x86_64-pc-linux-gnu
Created attachment 42905
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42905&action=edit
reduced testcase
This is a spill failure without -fschedule-insns.
Compiler output:
$ x86_64-pc-linux-gnu-gcc -O2 -flive-range-shrinkage -m8bit-idiv testcase.c
testcase.c: In function 'b':
testcase.c:11:1: error: unable to find a register to spill
}
^
testcase.c:11:1: error: this is the insn:
(insn 72 94 93 2 (parallel [
(set (reg/v:SI 165 [orig:115 e ] [115])
(ashiftrt:SI (reg/v:SI 165 [orig:115 e ] [115])
(reg:QI 166 [ g ])))
(clobber (reg:CC 17 flags))
]) "testcase.c":6 578 {*ashrsi3_1}
(expr_list:REG_DEAD (reg:QI 166 [ g ])
(expr_list:REG_UNUSED (reg:CC 17 flags)
(nil))))
during RTL pass: reload
testcase.c:11:1: internal compiler error: in assign_by_spills, at
lra-assigns.c:1468
0x5c8f73 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
/repo/gcc-trunk/gcc/rtl-error.c:108
0xb660a6 assign_by_spills
/repo/gcc-trunk/gcc/lra-assigns.c:1468
0xb6681e lra_assign()
/repo/gcc-trunk/gcc/lra-assigns.c:1662
0xb61086 lra(_IO_FILE*)
/repo/gcc-trunk/gcc/lra.c:2469
0xb04c69 do_reload
/repo/gcc-trunk/gcc/ira.c:5443
0xb04c69 execute
/repo/gcc-trunk/gcc/ira.c:5627
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
$ x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-255776-checking-yes-rtl-df-extra-nobootstrap-nographite-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/8.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--disable-bootstrap --without-cloog --without-ppl --without-isl
--build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--target=x86_64-pc-linux-gnu --with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-255776-checking-yes-rtl-df-extra-nobootstrap-nographite-amd64
Thread model: posix
gcc version 8.0.0 20171218 (experimental) (GCC)
