https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85030
Bug ID: 85030
Summary: internal compiler error: Floating point exception
(validate_subreg())
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Keywords: ice-on-invalid-code
Severity: normal
Priority: P3
Component: inline-asm
Assignee: unassigned at gcc dot gnu.org
Reporter: vegard.nossum at oracle dot com
Target Milestone: ---
Input:
void d() {
struct f {
int c;
int *b;
int *e;
} a;
asm("" : "=rm" (a) : "0" (1));
}
Output:
$ cc1plus
void d()
Analyzing compilation unit
Performing interprocedural optimizations
<*free_lang_data> <visibility> <build_ssa_passes> <opt_local_passes>
<targetclone> <free-fnsummary> <whole-program> <fnsummary> <inline>
<free-fnsummary> <single-use> <comdats>Assembling functions:
<materialize-all-clones> <simdclone> void d()during RTL pass: reload
<stdin>: In function 'void d()':
<stdin>:9:1: internal compiler error: Floating point exception
0x3152ce9 crash_signal
/home/vegard/git/gcc/gcc/toplev.c:325
0x1d80f52 validate_subreg(machine_mode, machine_mode, rtx_def const*,
poly_int<1u, unsigned long>)
/home/vegard/git/gcc/gcc/emit-rtl.c:910
0x1d81db6 gen_rtx_SUBREG(machine_mode, rtx_def*, poly_int<1u, unsigned long>)
/home/vegard/git/gcc/gcc/emit-rtl.c:1010
0x1d81db6 gen_lowpart_SUBREG(machine_mode, rtx_def*)
/home/vegard/git/gcc/gcc/emit-rtl.c:1026
0x287cde5 match_reload
/home/vegard/git/gcc/gcc/lra-constraints.c:945
0x28ade79 curr_insn_transform
/home/vegard/git/gcc/gcc/lra-constraints.c:4335
0x28b93b6 lra_constraints(bool)
/home/vegard/git/gcc/gcc/lra-constraints.c:4877
0x2829984 lra(_IO_FILE*)
/home/vegard/git/gcc/gcc/lra.c:2419
0x2608794 do_reload
/home/vegard/git/gcc/gcc/ira.c:5465
0x2608794 execute
/home/vegard/git/gcc/gcc/ira.c:5649
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.
Version:
GNU C++14 (GCC) version 8.0.1 20180306 (experimental) (x86_64-pc-linux-gnu)
Looks similar to bug #49522, but that's OLD (and fixed).
It starts failing between 4.7.4 and 4.8.1.
Not C++-specific, cc1 crashes with the same test case.
Clang also seems to segfault on this one...
