https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96446
Bug ID: 96446
Summary: ICE when spilling an MMA accumulator
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: bergner at gcc dot gnu.org
Target Milestone: ---
We get an ICE when we are forced to spill an MMA accumulator that has a zero
value. We seem to be missing a alternative that accepts the value zero in the
move pattern. This is broken on trunk and the GCC 10 branch.
bergner@pike:~/gcc/BUGS$ cat quad-ice.c
extern void bar (void);
void
foo (__vector_quad *dst)
{
__vector_quad acc;
__builtin_mma_xxsetaccz (&acc);
bar ();
*dst = acc;
}
bergner@pike:~/gcc/BUGS$
/home/bergner/gcc/build/gcc-fsf-mainline-base-debug/gcc/xgcc
-B/home/bergner/gcc/build/gcc-fsf-mainline-base-debug/gcc -S -O2 -mcpu=power10
quad-ice.c
quad-ice.c: In function ‘foo’:
quad-ice.c:9:1: error: could not split insn
9 | }
| ^
(insn 15 41 16 (set (reg:PXI 32 0 [orig:117 _1 ] [117])
(const_int 0 [0])) "quad-ice.c":8:8 2001 {*movpxi}
(nil))
during RTL pass: final
quad-ice.c:9:1: internal compiler error: in final_scan_insn_1, at final.c:3073
0x11109e6b _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
/home/bergner/gcc/gcc-fsf-mainline-base/gcc/rtl-error.c:108
0x10a741bf final_scan_insn_1
/home/bergner/gcc/gcc-fsf-mainline-base/gcc/final.c:3073
0x10a74a4b final_scan_insn(rtx_insn*, _IO_FILE*, int, int, int*)
/home/bergner/gcc/gcc-fsf-mainline-base/gcc/final.c:3152
0x10a6f807 final_1
/home/bergner/gcc/gcc-fsf-mainline-base/gcc/final.c:2020
0x10a7b6f7 rest_of_handle_final
/home/bergner/gcc/gcc-fsf-mainline-base/gcc/final.c:4658
0x10a7be3f execute
/home/bergner/gcc/gcc-fsf-mainline-base/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.
