[Bug target/79237] New: ARMv7-M ICE in extract_constrain_insn, insn does not satisfy its constraints

["headch at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79237

            Bug ID: 79237
           Summary: ARMv7-M ICE in extract_constrain_insn, insn does not
                    satisfy its constraints
           Product: gcc
           Version: 6.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: headch at gmail dot com
  Target Milestone: ---

Created attachment 40585
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40585&action=edit
Source code reproducing the bug

$ armv7m-none-eabihf-g++ -O2 -mslow-flash-data -mcpu=cortex-m4
 -mfpu=fpv4-sp-d16 -c test.cpp test.cpp: In member function ‘void
 S2::memFun()’: test.cpp:22:1: error: insn does not satisfy its
 constraints: }
 ^
(insn 8 20 6 2 (set (reg:SI 31 s15 [orig:118 obj1.mem1 ] [118])
        (mem/u/c:SI (reg/f:SI 3 r3 [116]) [5 obj1.mem1+0 S4 A32]))
 test.cpp:21 615 {*thumb2_movsi_vfp} (nil))
test.cpp:22:1: internal compiler error: in extract_constrain_insn, at
 recog.c:2190 Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

$ armv7m-none-eabihf-g++ -v
Using built-in specs.
COLLECT_GCC=armv7m-none-eabihf-g++
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/armv7m-none-eabihf/6.3.0/lto-wrapper
Target: armv7m-none-eabihf
Configured
with:
/tmp/portage/dev-embedded/armv7m-none-eabihf-gcc-6.3.0/work/gcc-6.3.0/configure
--prefix=/usr --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share
--sysconfdir=/etc --localstatedir=/var/lib
--docdir=/usr/share/doc/armv7m-none-eabihf-gcc-6.3.0
--htmldir=/usr/share/doc/armv7m-none-eabihf-gcc-6.3.0/html
--libdir=/usr/lib64 --target=armv7m-none-eabihf
--infodir=/usr/share/gcc-data/armv7m-none-eabihf/6.3.0/info
--disable-multilib --disable-threads --with-cpu=cortex-m4
--with-abi=aapcs --with-fpu=vfpv3-d16 --with-float=hard
--with-mode=thumb --enable-languages=c,c++ --disable-libstdc++-v3
--disable-libada --disable-libsanitizer --disable-libssp
--disable-libquadmath --disable-libquadmath-support --disable-libgomp
--disable-libvtv --with-dwarf2 --without-headers --with-system-zlib
--enable-nls --without-included-gettext Thread model: single gcc
version 6.3.0 (GCC) 

Note that this is a locally developed Gentoo ebuild which runs a fairly stock
ARM GCC install. I can try reproducing in a completely isolated,
non-ebuild-driven environment if necessary.