[Bug target/109140] ICE (during RTL pass: internal compiler error: in extract_insn, at recog.cc:2791) when building qemu on sparc64-unknown-linux-gnu with -march=niagara4

[mikpelinux at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109140

--- Comment #7 from Mikael Pettersson <mikpelinux at gmail dot com> ---
With -O2 -ftree-vectorize -mcpu=niagara4 a bisect between 9.5.0 (good) and
10.4.0 (bad) found

6271dd984d7f920d4fb17ad37af6a1f8e6b796dc is the first bad commit
commit 6271dd984d7f920d4fb17ad37af6a1f8e6b796dc
Author: Wilco Dijkstra <wdijk...@arm.com>
Date:   Wed Nov 20 16:29:23 2019 +0000

    PR85678: Change default to -fno-common

And sure enough, with -O2 -ftree-vectorize -fno-common -mcpu=niagara4 gcc-9.5.0
also ICEs.