https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115013
Bug ID: 115013
Summary: LRA: PR114810 fix result in ICE in the RISC-V Vector
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: pan2.li at intel dot com
Target Milestone: ---
The patch:
[PR114810][LRA]: Recognize alternatives with lack of available registers for
insn and demote them.
Results in some ICE in the rvv.exp of RISC-V backend.
========= Summary of gcc testsuite =========
| # of unexpected case / # of unique unexpected
case
| gcc | g++ | gfortran |
rv64gcv/ lp64d/ medlow | 1061 / 69 | 0 / 0 | - |
make: *** [Makefile:1096: report-gcc-newlib] Error 1
Just pick one imm_loop_invariant-10.c as below.
.../gcc/testsuite/gcc.target/riscv/rvv/vsetvl/imm_loop_invariant-10.c:20:1:
error: unrecognizable insn:
(insn 265 0 0 (parallel [
(set (reg:RVVMF8QI 309 [239])
(unspec:RVVMF8QI [
(reg:SI 0 zero)
] UNSPEC_VUNDEF))
(clobber (scratch:SI))
]) -1
(nil))
during RTL pass: reload
…. gcc/testsuite/gcc.target/riscv/rvv/vsetvl/imm_loop_invariant-10.c:20:1:
internal compiler error: in extract_insn, at recog.cc:2812
0xa9d309 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
........../.././gcc/gcc/rtl-error.cc:108
0xa9d32b _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
........../.././gcc/gcc/rtl-error.cc:116
0xa9bc07 extract_insn(rtx_insn*)
........../.././gcc/gcc/recog.cc:2812
0x10e5ad2 ira_remove_insn_scratches(rtx_insn*, bool, _IO_FILE*, rtx_def*
(*)(rtx_def*))
........../.././gcc/gcc/ira.cc:5381
0x112868f remove_insn_scratches
........../.././gcc/gcc/lra.cc:2154
0x112868f lra_emit_move(rtx_def*, rtx_def*)
........../.././gcc/gcc/lra.cc:513
0x1136883 match_reload
........../.././gcc/gcc/lra-constraints.cc:1184
0x1142ae4 curr_insn_transform
........../.././gcc/gcc/lra-constraints.cc:4778
0x11443cb lra_constraints(bool)
........../.././gcc/gcc/lra-constraints.cc:5481
0x112b192 lra(_IO_FILE*, int)
........../.././gcc/gcc/lra.cc:2442
0x10e0e7f do_reload
........../.././gcc/gcc/ira.cc:5973
0x10e0e7f execute
........../.././gcc/gcc/ira.cc:6161
reproduced by below command:
riscv64-unknown-elf-gcc -c -S
gcc/testsuite/gcc.target/riscv/rvv/vsetvl/imm_loop_invariant-10.c
-march=rv32gcv -mabi=ilp32 -o -
