https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95142
Bug ID: 95142
Summary: ICE when compiling certain logic with -Ofast and
-mpretend-cmove when dealing with floats
Product: gcc
Version: 9.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: hayden at hkowsoftware dot com
Target Milestone: ---
Created attachment 48537
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48537=edit
small self contained example showing the crash
this issue is exhibited by the included source in versions gcc 9.3 and 10.0.1
for the sh4 target.
It seems to be related to using cmove when dealing with access to a float using
an index from a pointer, included is a small ~60 line example demonstrating
this.
sh4-linux-gnu-gcc-9-Ofast -mpretend-cmove -c ice_sh4.c
ice_sh4.c: In function ‘call_create’:
ice_sh4.c:48:1: error: unrecognizable insn:
48 | }
| ^
(insn 26 25 27 2 (parallel [
(set (reg:SI 147 t)
(ge:SI (reg/v:SF 170 [ size_1 ])
(reg/v:SF 167 [ size_0 ])))
(clobber (reg:SI 155 fpscr1))
(use (reg:SI 154 fpscr0))
]) "ice_sh4.c":41:29 -1
(nil))
during RTL pass: vregs
ice_sh4.c:48:1: internal compiler error: in extract_insn, at recog.c:2310
version info for gcc 9.3:
Using built-in specs.
COLLECT_GCC=sh4-linux-gnu-gcc-9
COLLECT_LTO_WRAPPER=/usr/lib/gcc-cross/sh4-linux-gnu/9/lto-wrapper
Target: sh4-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 9.3.0-8'
--with-bugurl=file:///usr/share/doc/gcc-9/README.Bugs
--enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --program-suffix=-9 --enable-shared
--enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/
--enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-libsanitizer --disable-libquadmath --disable-libquadmath-support
--enable-plugin --with-system-zlib --disable-libphobos --enable-multiarch
--disable-werror --with-cpu=sh4 --with-multilib-list=m4,m4-nofpu
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=sh4-linux-gnu --program-prefix=sh4-linux-gnu-
--includedir=/usr/sh4-linux-gnu/include --with-build-config=bootstrap-lto-lean
--enable-link-mutex
Thread model: posix
gcc version 9.3.0 (Debian 9.3.0-8)
version info for gcc 10.0.1:
Using built-in specs.
COLLECT_GCC=sh4-linux-gnu-gcc-10
COLLECT_LTO_WRAPPER=/usr/lib/gcc-cross/sh4-linux-gnu/10/lto-wrapper
Target: sh4-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 10-20200418-1'
--with-bugurl=file:///usr/share/doc/gcc-10/README.Bugs
--enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --program-suffix=-10 --enable-shared
--enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/
--enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-libsanitizer --disable-libquadmath --disable-libquadmath-support
--enable-plugin --with-system-zlib --disable-libphobos --enable-multiarch
--disable-werror --with-cpu=sh4 --with-multilib-list=m4,m4-nofpu
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=sh4-linux-gnu --program-prefix=sh4-linux-gnu-
--includedir=/usr/sh4-linux-gnu/include
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 10.0.1 20200418 (experimental) [master revision
27c171775ab:4c277008be0:c5bac7d127f288fd2f8a1f15c3f30da5903141c6] (Debian
10-20200418-1)
