Re: [PATCH V3 0/7] ira/lra: Support subreg coalesce

[Dimitar Dimitrov <dimitar@dinux.eu>]

On Sun, Nov 12, 2023 at 08:08:10PM +0800, Lehua Ding wrote:
> V3 Changes:
>   1. fix three ICE.
>   2. rebase
> 
> Hi,
> 
> These patchs try to support subreg coalesce feature in
> register allocation passes (ira and lra).
> 

Hi Lehua,

V3 indeed fixes the arm-none-eabi build. It's also confirmed by Linaro CI:
  https://patchwork.sourceware.org/project/gcc/patch/20231112120817.2635864-8-lehua.ding@rivai.ai/

But avr and pru backends are still broken, albeit with different crash
signatures. Both targets are peculiar because they have
UNITS_PER_WORD=1. I'll try building some 16-bit target like msp430.

AVR fails when building libgcc:
/mnt/nvme/dinux/local-workspace/gcc/libgcc/config/avr/lib2funcs.c: In function '__roundlr':
/mnt/nvme/dinux/local-workspace/gcc/libgcc/config/avr/lib2funcs.c:115:3: internal compiler error: in check_allocation, at ira.cc:2673
  115 |   }
      |   ^
/mnt/nvme/dinux/local-workspace/gcc/libgcc/config/avr/lib2funcs.c:106:3: note: in expansion of macro 'ROUND2'
  106 |   ROUND2 (FX)
      |   ^~~~~~
/mnt/nvme/dinux/local-workspace/gcc/libgcc/config/avr/lib2funcs.c:117:1: note: in expansion of macro 'ROUND1'
  117 | ROUND1(L_LABEL)
      | ^~~~~~
0xc80b8d check_allocation
        /mnt/nvme/dinux/local-workspace/gcc/gcc/ira.cc:2673
0xc89451 ira
        /mnt/nvme/dinux/local-workspace/gcc/gcc/ira.cc:5873
0xc89451 execute
        /mnt/nvme/dinux/local-workspace/gcc/gcc/ira.cc:6104

Script I'm using to build avr: https://github.com/dinuxbg/gnupru/blob/master/testing/manual-build-avr.sh



PRU fails building newlib:
/mnt/nvme/dinux/local-workspace/newlib/newlib/libc/stdlib/gdtoa-gdtoa.c:835:9: internal compiler error: in lra_create_live_ranges, at lra-lives.cc:1933
  835 |         }
      |         ^
0x6b951c lra_create_live_ranges(bool, bool)
        /mnt/nvme/dinux/local-workspace/gcc/gcc/lra-lives.cc:1933
0xd9320c lra(_IO_FILE*)
        /mnt/nvme/dinux/local-workspace/gcc/gcc/lra.cc:2638
0xd3e519 do_reload
        /mnt/nvme/dinux/local-workspace/gcc/gcc/ira.cc:5960
0xd3e519 execute
        /mnt/nvme/dinux/local-workspace/gcc/gcc/ira.cc:6148

Script I'm using to build pru: https://github.com/dinuxbg/gnupru/blob/master/testing/manual-build-pru.sh

Regards,
Dimitar,