https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94185
--- Comment #3 from Zdenek Sojka <zsojka at seznam dot cz> ---
I am hitting probably the same issue:
$ cat testcase.c
int a, b, c;
int
foo (char e, short f, long g)
{
g = __builtin_mul_overflow (a, c, &b) ? g : (unsigned) g;
g &= __builtin_clrsbll (b);
return e + f + g + a + b + c;
}
$ x86_64-pc-linux-gnu-gcc -O -fno-omit-frame-pointer -mbranch-cost=1 testcase.c
testcase.c: In function 'foo':
testcase.c:9:1: error: unable to generate reloads for:
9 | }
| ^
(insn 27 26 28 3 (set (mem/c:DI (plus:DI (reg/f:DI 19 frame)
(const_int -56 [0xffffffffffffffc8])) [2 %sfp+-8 S8 A64])
(zero_extend:DI (mem/c:SI (plus:DI (reg/f:DI 19 frame)
(const_int -56 [0xffffffffffffffc8])) [2 %sfp+-8 S4 A64])))
114 {*zero_extendsidi2}
(nil))
during RTL pass: reload
testcase.c:9:1: internal compiler error: in curr_insn_transform, at
lra-constraints.c:4006
0x6d3384 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
/repo/gcc-trunk/gcc/rtl-error.c:108
0x68fcfe curr_insn_transform
/repo/gcc-trunk/gcc/lra-constraints.c:4006
0xe36e76 lra_constraints(bool)
/repo/gcc-trunk/gcc/lra-constraints.c:5025
0xe2199c lra(_IO_FILE*)
/repo/gcc-trunk/gcc/lra.c:2437
0xdd5479 do_reload
/repo/gcc-trunk/gcc/ira.c:5523
0xdd5479 execute
/repo/gcc-trunk/gcc/ira.c:5709
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.
and also on another testcase; -fno-omit-frame-pointer seems to be the common
compiler switch
