https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97144
Bug ID: 97144
Summary: [10/11 Regression] SVE: ICE (could not split insn) in
final_scan_insn_1 since r10-2553-g0fdc30bcf56
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: acoplan at gcc dot gnu.org
Target Milestone: ---
For the following testcase:
int a, b = 5, c = 3;
char d;
char e[1];
int f[] = {0, 0, 1};
short g;
char *h = e;
void i(void) { b = a; }
static void j(void) {
h = e;
if (f[2])
k:
for (;;) {
for (c = 0; c <= 4; c++) {
for (g = 0; g <= 4; g++)
f[g + 4] &= 2;
}
if (d)
goto k;
}
}
void l(void) {
j();
c = 0;
}
AArch64 GCC ICEs at -O2 -ftree-vectorize -march=armv8.2-a+sve since
r10-2553-g0fdc30bcf56d7b46122d7e67d61b56c0a198f3b3:
commit 0fdc30bcf56d7b46122d7e67d61b56c0a198f3b3
Author: Richard Sandiford <richard.sandif...@arm.com>
Date: Thu Aug 15 09:47:25 2019
[AArch64] Rework SVE INC/DEC handling
To reproduce:
$ aarch64-none-elf-gcc -c -S -O2 -ftree-vectorize -march=armv8.2-a+sve test.c
test.c: In function 'l':
test.c:24:1: error: could not split insn
24 | }
| ^
(insn:TI 29 28 36 (set (reg/f:DI 0 x0 [orig:96 _17 ] [96])
(plus:DI (reg/f:DI 0 x0 [139])
(const_poly_int:DI [48, 16]))) 124 {*adddi3_poly_1}
(expr_list:REG_EQUIV (const:DI (plus:DI (symbol_ref:DI ("*.LANCHOR0")
[flags 0x182])
(const_poly_int:DI [48, 16])))
(nil)))
during RTL pass: final
test.c:24:1: internal compiler error: in final_scan_insn_1, at final.c:3073
0xcf91a3 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
/home/alecop01/toolchain/src/gcc/gcc/rtl-error.c:108
0x9b4026 final_scan_insn_1
/home/alecop01/toolchain/src/gcc/gcc/final.c:3073
0x9b414d final_scan_insn(rtx_insn*, _IO_FILE*, int, int, int*)
/home/alecop01/toolchain/src/gcc/gcc/final.c:3152
0x9b4d66 final_1
/home/alecop01/toolchain/src/gcc/gcc/final.c:2020
0x9b50c4 rest_of_handle_final
/home/alecop01/toolchain/src/gcc/gcc/final.c:4658
0x9b50c4 execute
/home/alecop01/toolchain/src/gcc/gcc/final.c:4736
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.
