Hi Dimitar,
I solved the problem you reported in V2 patch
(https://gcc.gnu.org/pipermail/gcc-patches/2023-November/636166.html),
is it possible for you to help confirm this? Thank you very much.
On 2023/11/9 0:56, Dimitar Dimitrov wrote:
On Wed, Nov 08, 2023 at 11:47:33AM +0800, Lehua Ding wrote:
Hi,
These patchs try to support subreg coalesce feature in
register allocation passes (ira and lra).
Hi Lehua,
This patch set breaks the build for at least three embedded targets. See
below.
For avr the GCC build fails with:
/mnt/nvme/dinux/local-workspace/gcc/gcc/ira-lives.cc:149:39: error: call of overloaded
‘set_subreg_conflict_hard_regs(ira_allocno*&, int&)’ is ambiguous
149 | set_subreg_conflict_hard_regs (OBJECT_ALLOCNO (obj), regno);
For arm-none-eabi the newlib build fails with:
/mnt/nvme/dinux/local-workspace/newlib/newlib/libm/math/e_jn.c:279:1: internal
compiler error: Floating point exception
279 | }
| ^
0x1176e0f crash_signal
/mnt/nvme/dinux/local-workspace/gcc/gcc/toplev.cc:316
0xf6008d get_range_hard_regs(int, subreg_range const&)
/mnt/nvme/dinux/local-workspace/gcc/gcc/lra.cc:609
0xf6008d get_range_hard_regs(int, subreg_range const&)
/mnt/nvme/dinux/local-workspace/gcc/gcc/lra.cc:601
0xf60312 new_insn_reg
/mnt/nvme/dinux/local-workspace/gcc/gcc/lra.cc:658
0xf6064d add_regs_to_insn_regno_info
/mnt/nvme/dinux/local-workspace/gcc/gcc/lra.cc:1623
0xf62909 lra_update_insn_regno_info(rtx_insn*)
/mnt/nvme/dinux/local-workspace/gcc/gcc/lra.cc:1769
0xf62e46 lra_update_insn_regno_info(rtx_insn*)
/mnt/nvme/dinux/local-workspace/gcc/gcc/lra.cc:1762
0xf62e46 lra_push_insn_1
/mnt/nvme/dinux/local-workspace/gcc/gcc/lra.cc:1919
0xf62f2d lra_push_insn(rtx_insn*)
/mnt/nvme/dinux/local-workspace/gcc/gcc/lra.cc:1927
0xf62f2d push_insns
/mnt/nvme/dinux/local-workspace/gcc/gcc/lra.cc:1970
0xf63302 push_insns
/mnt/nvme/dinux/local-workspace/gcc/gcc/lra.cc:1966
0xf63302 lra(_IO_FILE*)
/mnt/nvme/dinux/local-workspace/gcc/gcc/lra.cc:2511
0xf0e399 do_reload
/mnt/nvme/dinux/local-workspace/gcc/gcc/ira.cc:5960
0xf0e399 execute
/mnt/nvme/dinux/local-workspace/gcc/gcc/ira.cc:6148
For pru-elf the GCC build fails with:
/mnt/nvme/dinux/local-workspace/gcc/libgcc/unwind-dw2-fde.c: In function
'linear_search_fdes':
/mnt/nvme/dinux/local-workspace/gcc/libgcc/unwind-dw2-fde.c:1035:1: internal
compiler error: Floating point exception
1035 | }
| ^
0x1694f2e crash_signal
/mnt/nvme/dinux/local-workspace/gcc/gcc/toplev.cc:316
0x1313178 get_range_hard_regs(int, subreg_range const&)
/mnt/nvme/dinux/local-workspace/gcc/gcc/lra.cc:609
0x131343a new_insn_reg
/mnt/nvme/dinux/local-workspace/gcc/gcc/lra.cc:658
0x13174f0 add_regs_to_insn_regno_info
/mnt/nvme/dinux/local-workspace/gcc/gcc/lra.cc:1608
0x1318479 lra_update_insn_regno_info(rtx_insn*)
/mnt/nvme/dinux/local-workspace/gcc/gcc/lra.cc:1769
0x13196ab lra_push_insn_1
/mnt/nvme/dinux/local-workspace/gcc/gcc/lra.cc:1919
0x13196de lra_push_insn(rtx_insn*)
/mnt/nvme/dinux/local-workspace/gcc/gcc/lra.cc:1927
0x13197da push_insns
/mnt/nvme/dinux/local-workspace/gcc/gcc/lra.cc:1970
0x131b6dc lra(_IO_FILE*)
/mnt/nvme/dinux/local-workspace/gcc/gcc/lra.cc:2511
0x129f237 do_reload
/mnt/nvme/dinux/local-workspace/gcc/gcc/ira.cc:5960
0x129f6c6 execute
/mnt/nvme/dinux/local-workspace/gcc/gcc/ira.cc:6148
The divide by zero error above is interesting. I'm not sure why
ira_reg_class_max_nregs[] yields 0 for the pseudo register 168 in the following
rtx:
(debug_insn 168 167 169 19 (var_location:SI encoding (reg/v:SI 168 [ encoding
])) -1
(nil))
Regards,
Dimitar
--
Best,
Lehua (RiVAI)
lehua.d...@rivai.ai
