https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99574
Bug ID: 99574
Summary: gcc-11 unrecognizable insn in extract_constrain_insn,
at recog.c:2670
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: arnd at linaro dot org
Target Milestone: ---
Another internal compiler error from building a linux kernel, this time on
x86-32, reduced to:
$ cat sem.c
struct {
short a;
} * b;
struct {
int c;
} * d;
int e;
short f;
void g(void) {
for (;;) {
asm("" : "=r"(e) : "g"(d->c));
int h = f - b->a;
if (h > 7)
f = h;
}
}
$ x86_64-linux-gnu-gcc-11 --version
x86_64-linux-gnu-gcc-11 (Ubuntu 11-20210306-1ubuntu1) 11.0.1 20210306
(experimental) [master revision
574e7601829:6b84c9062bc:84185598dc7470bad4e7f8c22b64e3c944efb670]
$ x86_64-linux-gnu-gcc-11 -m32 -fno-omit-frame-pointer -fno-strict-overflow
-O2 -c sem.c -Wall
sem.c: In function ‘g’:
sem.c:16:1: error: unrecognizable insn:
16 | }
| ^
(insn 9 6 7 4 (parallel [
(set (reg:SI 1 dx [92])
(asm_operands:SI ("") ("=r") 0 [
(mem:SI (mem/c:SI (plus:SI (reg/f:SI 6 bp)
(const_int -20 [0xffffffffffffffec])) [7
%sfp+-8 S4 A32]) [1 d.0_1->c+0 S4 A32])
]
[
(asm_input:SI ("g") sem.c:11)
]
[] sem.c:11))
(clobber (reg:CC 17 flags))
]) "sem.c":11:5 -1
(expr_list:REG_EQUIV (mem/c:SI (plus:SI (reg:SI 2 cx [82])
(const:SI (unspec:SI [
(symbol_ref:SI ("e") [flags 0x2] <var_decl
0x7fc291759c60 e>)
] UNSPEC_GOTOFF))) [1 e+0 S4 A32])
(nil)))
during RTL pass: reload
sem.c:16:1: internal compiler error: in extract_constrain_insn, at recog.c:2670
0xce2eb1 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
../../src/gcc/rtl-error.c:108
0xce3057 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
../../src/gcc/rtl-error.c:116
0x95f537 extract_constrain_insn(rtx_insn*)
../../src/gcc/recog.c:2670
0x95f537 extract_constrain_insn(rtx_insn*)
../../src/gcc/recog.c:2666
0x95f537 check_rtl
../../src/gcc/lra.c:2087
0x17962bc lra(_IO_FILE*)
../../src/gcc/lra.c:2505
0x1794579 do_reload
../../src/gcc/ira.c:5827
0x1794579 execute
../../src/gcc/ira.c:6013
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <file:///usr/share/doc/gcc-11/README.Bugs> for instructions.
