https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100793
Bug ID: 100793
Summary: ICE: in expand_assignment, at expr.c:5363
Product: gcc
Version: tree-ssa
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: cnsun at uwaterloo dot ca
Target Milestone: ---
$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/scratch/software/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/12.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /tmp/tmp.SQC1E9RsGE-gcc-builder/gcc/configure
--enable-languages=c,c++,lto --enable-checking-yes --enable-multiarch
--prefix=/scratch/software/gcc-trunk --disable-bootstrap
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 12.0.0 20210527 (experimental) [master revision
:d03f010a0:01c59ef2e5a59b44d2b662361196abb6be872a20] (GCC)
$ cat mutant.c
f4() {
register a;
register __attribute__((vector_size(16))) b __asm("xmm17");
b[a] = a;
asm("" : "+v"(b));
}
$ gcc-trunk mutant.c
mutant.c:1:1: warning: return type defaults to ‘int’ [-Wimplicit-int]
1 | f4() {
| ^~
mutant.c: In function ‘f4’:
mutant.c:2:12: warning: type defaults to ‘int’ in declaration of ‘a’
[-Wimplicit-int]
2 | register a;
| ^
mutant.c:3:45: warning: type defaults to ‘int’ in declaration of ‘b’
[-Wimplicit-int]
3 | register __attribute__((vector_size(16))) b __asm("xmm17");
| ^
mutant.c:3:45: error: the register specified for ‘b’ cannot be accessed by the
current target
during RTL pass: expand
mutant.c:4:8: internal compiler error: in expand_assignment, at expr.c:5363
4 | b[a] = a;
| ~~~~~^~~
0x6b2f16 expand_assignment(tree_node*, tree_node*, bool)
/tmp/tmp.SQC1E9RsGE-gcc-builder/gcc/gcc/expr.c:5363
0xa4307f expand_gimple_stmt_1
/tmp/tmp.SQC1E9RsGE-gcc-builder/gcc/gcc/cfgexpand.c:3916
0xa4307f expand_gimple_stmt
/tmp/tmp.SQC1E9RsGE-gcc-builder/gcc/gcc/cfgexpand.c:4014
0xa49159 expand_gimple_basic_block
/tmp/tmp.SQC1E9RsGE-gcc-builder/gcc/gcc/cfgexpand.c:6056
0xa4b02f execute
/tmp/tmp.SQC1E9RsGE-gcc-builder/gcc/gcc/cfgexpand.c:6782
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.
