Created attachment 46263 [details]
reduced testcase

Compiler output:
$ armv7a-hardfloat-linux-gnueabi-gcc -O -fno-dce -fno-forward-propagate -fno-omit-frame-pointer testcase.c 
during RTL pass: reload
testcase.c: In function 'foo':
testcase.c:13:1: internal compiler error: in lra_assign, at lra-assigns.c:1650
   13 | }
      | ^
0xc3093a lra_assign(bool&)
        /repo/gcc-trunk/gcc/lra-assigns.c:1650
0xc2a5ca lra(_IO_FILE*)
        /repo/gcc-trunk/gcc/lra.c:2534
0xbd5369 do_reload
        /repo/gcc-trunk/gcc/ira.c:5516
0xbd5369 execute
        /repo/gcc-trunk/gcc/ira.c:5700
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.


$ armv7a-hardfloat-linux-gnueabi-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-armv7a-hardfloat/bin/armv7a-hardfloat-linux-gnueabi-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-270639-checking-yes-rtl-df-extra-armv7a-hardfloat/bin/../libexec/gcc/armv7a-hardfloat-linux-gnueabi/10.0.0/lto-wrapper
Target: armv7a-hardfloat-linux-gnueabi
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++ --enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra --with-cloog --with-ppl --with-isl --with-float=hard --with-fpu=vfpv4 --with-arch=armv7-a --with-sysroot=/usr/armv7a-hardfloat-linux-gnueabi --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu --target=armv7a-hardfloat-linux-gnueabi --with-ld=/usr/bin/armv7a-hardfloat-linux-gnueabi-ld --with-as=/usr/bin/armv7a-hardfloat-linux-gnueabi-as --disable-libstdcxx-pch --prefix=/repo/gcc-trunk//binary-trunk-270639-checking-yes-rtl-df-extra-armv7a-hardfloat
Thread model: posix
gcc version 10.0.0 20190429 (experimental) (GCC)