https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94185
Bug ID: 94185
Summary: gcc-10 crashes with "error: unable to generate reloads
for {*zero_extendsidi2} internal compiler error: in
curr_insn_transform, at lra-constraints.c:4006
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: slyfox at inbox dot ru
Target Milestone: ---
Created attachment 48037
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48037&action=edit
bug.cc
Originally observed on smartmontools-7.0, reduced with creduce down to:
struct a {
int b;
int c();
a() : b(c()) {}
~a();
char *e();
};
struct f {
void g(int);
};
struct ar {
int au[256];
f h(int);
} bb;
a i();
a j(int);
long k(int, ar);
int d;
void l(char *, ar m, long n) {
switch (m.au[d])
case 0:
n &= 4294967295;
bb.h(0).g(n);
}
void o() {
ar bd;
a bh, bi, attrname = j(0) = i();
int be = k(0, bd);
l(attrname.e(), bd, be);
}
Exact command to crash gcc-master:
$ ./xg++ -B. -O2 -c -o /tmp/bug.o /tmp/bug.cc -fstack-protector-strong -fPIE
/tmp/bug.cc: In function 'void o()':
/tmp/bug.cc:30:1: error: unable to generate reloads for:
30 | }
| ^
(insn 62 61 63 8 (set (mem/c:DI (plus:DI (reg/f:DI 19 frame)
(const_int -2152 [0xfffffffffffff798])) [7 %sfp+-2104 S8 A64])
(zero_extend:DI (mem/c:SI (plus:DI (reg/f:DI 19 frame)
(const_int -2152 [0xfffffffffffff798])) [7 %sfp+-2104 S4
A64]))) "/tmp/bug.cc":22:7 114 {*zero_extendsidi2}
(nil))
during RTL pass: reload
/tmp/bug.cc:30:1: internal compiler error: in curr_insn_transform, at
lra-constraints.c:4006
0x7fc532a94dd9 __libc_start_main
../csu/libc-start.c:308
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.
Compiler is built as:
$ ./xg++ -B. -v
Reading specs from ./specs
COLLECT_GCC=./xg++
COLLECT_LTO_WRAPPER=./lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --enable-languages=c,c++ --disable-bootstrap
--with-multilib-list=m64
--prefix=/home/slyfox/dev/git/gcc-native-quick/../gcc-native-quick-installed
--disable-nls --without-isl --disable-libsanitizer --disable-libvtv
--disable-libgomp --disable-libstdcxx-pch --disable-libunwind-exceptions
CFLAGS='-O1 ' CXXFLAGS='-O1 ' --with-sysroot=/usr/x86_64-HEAD-linux-gnu
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 10.0.1 20200315 (experimental) (GCC)
