http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56157
Bug #: 56157 Summary: ICE with -ftree-vectorize in in compute_live_loop_exits (4.8 trunk) Classification: Unclassified Product: gcc Version: 4.8.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization AssignedTo: unassig...@gcc.gnu.org ReportedBy: j...@saout.de When compiling mesa-9.0.1 using the latest gcc trunk from SVN, I noticed the following ICE (seems to have been introduced at least a week ago, worked with some earlier 4.8.0 versions I haven't pinpointed). LANG=C gcc -O2 -ftree-vectorize -c lala.c lala.c: In function ‘fn’: lala.c:14:6: internal compiler error: in compute_live_loop_exits, at tree-ssa-loop-manip.c:219 void fn(unsigned char *dst_row, unsigned dst_stride, ^ lala.c:14:6: internal compiler error: Aborted gcc: internal compiler error: Aborted (program cc1) (on x86_64, reproducable with and without -m32) With the following reduced testcase: ------------------------------ #include <string.h> #include <stdint.h> union Pixel { uint64_t value; struct { unsigned short r; unsigned short g; unsigned short b; unsigned short a; } chan; }; void fn(unsigned char *dst_row, unsigned dst_stride, const unsigned char *src_row, unsigned src_stride, unsigned width, unsigned height) { unsigned x, y; for(y = 0; y < height; y += 1) { const unsigned char *src = src_row; unsigned char *dst = dst_row; for(x = 0; x < width; x += 1) { union Pixel pixel; pixel.chan.r = (unsigned short)(((unsigned)src[0]) * 0xffff / 0xff); pixel.chan.g = (unsigned short)(((unsigned)src[1]) * 0xffff / 0xff); pixel.chan.b = (unsigned short)(((unsigned)src[2]) * 0xffff / 0xff); pixel.chan.a = (unsigned short)(((unsigned)src[3]) * 0xffff / 0xff); memcpy(dst, &pixel, sizeof pixel); src += 4; dst += 8; } dst_row += dst_stride; src_row += src_stride/sizeof(*src_row); } } ------------------------------ gcc version: Using built-in specs. COLLECT_GCC=/usr/x86_64-pc-linux-gnu/gcc-bin/4.8.0-beta20130130/gcc COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/4.8.0-beta20130130/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: /var/tmp/portage/sys-devel/gcc-4.8.0_beta20130130/work/gcc-4.8-20130130/configure --prefix=/usr --bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/4.8.0-beta20130130 --includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.8.0-beta20130130/include --datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.8.0-beta20130130 --mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.8.0-beta20130130/man --infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.8.0-beta20130130/info --with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.8.0-beta20130130/include/g++-v4 --host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --disable-altivec --disable-fixed-point --with-cloog --disable-isl-version-check --disable-cloog-version-check --with-cloog-include=/usr/include/cloog --enable-cloog-backend=isl --enable-lto --enable-nls --without-included-gettext --with-system-zlib --enable-obsolete --disable-werror --enable-secureplt --enable-multilib --with-multilib-list=m32,m64 --with-build-config=bootstrap-lto --enable-libmudflap --disable-libssp --enable-libgomp --with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/4.8.0-beta20130130/python --enable-checking=release --enable-java-awt=gtk --enable-libstdcxx-time --enable-languages=c,c++,java,fortran --enable-shared --enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu --enable-targets=all --with-bugurl=http://bugs.gentoo.org/ --with-pkgversion='Gentoo 4.8.0_beta20130130' Thread model: posix gcc version 4.8.0-beta20130130 20130130 (experimental) (Gentoo 4.8.0_beta20130130) (it says Gentoo because I used the build environment, but it's essentially a vanilla gcc build which I am regularly throwing the SVN version at and building the system with)