https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100785
Bug ID: 100785
Summary: ICE: in expand_asm_stmt, at cfgexpand.c:3401
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.tVhv2eaPzV-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 20210526 (experimental) [master revision
:21638bbbf:1fd76b24306ed4df4cf9e797d900699ed59ce7f7] (GCC)
$ cat mutant.c
foo(struct { int a : 1; } * x) { __asm__("" : "+m"(x->a)); }
$ gcc-trunk mutant.c
mutant.c:1:5: warning: anonymous struct declared inside parameter list will not
be visible outside of this definition or declaration
1 | foo(struct { int a : 1; } * x) { __asm__("" : "+m"(x->a)); }
| ^~~~~~
mutant.c:1:1: warning: return type defaults to ‘int’ [-Wimplicit-int]
1 | foo(struct { int a : 1; } * x) { __asm__("" : "+m"(x->a)); }
| ^~~
mutant.c: In function ‘foo’:
mutant.c:1:34: error: output number 0 not directly addressable
1 | foo(struct { int a : 1; } * x) { __asm__("" : "+m"(x->a)); }
| ^~~~~~~
during RTL pass: expand
mutant.c:1:34: internal compiler error: in expand_asm_stmt, at cfgexpand.c:3401
0x68b3a6 expand_asm_stmt
/tmp/tmp.tVhv2eaPzV-gcc-builder/gcc/gcc/cfgexpand.c:3401
0xa41bb9 expand_gimple_stmt_1
/tmp/tmp.tVhv2eaPzV-gcc-builder/gcc/gcc/cfgexpand.c:3847
0xa41bb9 expand_gimple_stmt
/tmp/tmp.tVhv2eaPzV-gcc-builder/gcc/gcc/cfgexpand.c:4014
0xa47d09 expand_gimple_basic_block
/tmp/tmp.tVhv2eaPzV-gcc-builder/gcc/gcc/cfgexpand.c:6056
0xa49bdf execute
/tmp/tmp.tVhv2eaPzV-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.
