https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126289
Bug ID: 126289
Summary: ICE in extract_insn, at recog.cc:2894
__builtin_bcdsub_ge with -ffinite-math-only
Product: gcc
Version: 17.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: mjires at gcc dot gnu.org
Target Milestone: ---
Target: ppc64le-linux-gnu
Compiling reduced testcase gcc.target/powerpc/bcd-3.c results in ICE.
$ cat bcd-3.c
typedef __int128_t __attribute__((__vector_size__(16))) vector_128_t;
#include <altivec.h>
vector_128_t do_sub_ge_a, do_sub_ge_b;
void do_sub_ge() {
if (__builtin_bcdsub_ge(do_sub_ge_a, do_sub_ge_b, 0));
}
$ ppc64le-linux-gnu-gcc bcd-3.c -ffinite-math-only
bcd-3.c: In function ‘do_sub_ge’:
bcd-3.c:7:1: error: unrecognizable insn:
7 | }
| ^
(insn 12 11 16 2 (set (reg:SI 119 [ _3 ])
(ge:SI (reg:CCFP 106 6)
(const_int 0 [0]))) "bcd-3.c":5:7 -1
(nil))
during RTL pass: vregs
bcd-3.c:7:1: internal compiler error: in extract_insn, at recog.cc:2894
0x222b6d7 internal_error(char const*, ...)
/home/mjires/git/GCC/master/gcc/diagnostic-global-context.cc:787
0x2236ba3 fancy_abort(char const*, int, char const*)
/home/mjires/git/GCC/master/gcc/diagnostics/context.cc:1813
0xf717f6 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
/home/mjires/git/GCC/master/gcc/rtl-error.cc:108
0xf71815 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
/home/mjires/git/GCC/master/gcc/rtl-error.cc:116
0xf42f4a extract_insn(rtx_insn*)
/home/mjires/git/GCC/master/gcc/recog.cc:2894
0xb67a98 instantiate_virtual_regs_in_insn
/home/mjires/git/GCC/master/gcc/function.cc:1611
0xb67a98 instantiate_virtual_regs
/home/mjires/git/GCC/master/gcc/function.cc:1987
0xb67a98 execute
/home/mjires/git/GCC/master/gcc/function.cc:2034
/home/mjires/built/master-ppc64le-linux-gnu/libexec/gcc/ppc64le-linux-gnu/17.0.0/cc1
-quiet bcd-3.c -quiet -dumpdir a- -dumpbase bcd-3.c -dumpbase-ext .c
-ffinite-math-only -o /tmp/ccCz9bm8.s
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
$ ppc64le-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=ppc64le-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/home/mjires/built/master-ppc64le-linux-gnu/libexec/gcc/ppc64le-linux-gnu/17.0.0/lto-wrapper
Target: ppc64le-linux-gnu
Configured with: /home/mjires/git/GCC/master/configure
--prefix=/home/mjires/built/master-ppc64le-linux-gnu --target=ppc64le-linux-gnu
--disable-bootstrap --enable-languages=c,c++,fortran --disable-multilib
--enable-checking
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 17.0.0 20260716 (experimental) (GCC)
