https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70858
Bug ID: 70858 Summary: __builtin_ia32_bextr_u64 ICE with '-m32 -march=core-avx2' Product: gcc Version: 6.1.0 Status: UNCONFIRMED Severity: major Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: steven at uplinklabs dot net Target Milestone: --- $ gcc -v Using built-in specs. COLLECT_GCC=/usr/bin/gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-unknown-linux-gnu/6.1.0/lto-wrapper Target: x86_64-unknown-linux-gnu Configured with: /build/gcc-multilib/src/gcc-6.1.0/configure --host=x86_64-unknown-linux-gnu --build=x86_64-unknown-linux-gnu --target=x86_64-unknown-linux-gnu --prefix=/usr --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=https://www.uplinklabs.net/ --enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --disable-libssp --disable-libstdcxx-pch --disable-libunwind-exceptions --disable-werror --enable-checking=release --enable-clocale=gnu --enable-__cxa_atexit --enable-gnu-indirect-function --enable-gnu-unique-object --enable-install-libiberty --enable-libmpx --enable-linker-build-id --enable-lto --enable-multilib --enable-plugin --enable-shared --enable-threads=posix --with-isl --with-linker-hash-style=gnu --with-multilib-list=m32,m64,mx32 --with-system-zlib Thread model: posix gcc version 6.1.0 (GCC) Reduced testcase via creduce: $ cat test.i int a, b, c; int d() { c = __builtin_ia32_bextr_u64(a, b); } $ gcc -m32 -march=core-avx2 -c test.i test.i: In function ādā: test.i:2:1: error: unrecognizable insn: int d() { c = __builtin_ia32_bextr_u64(a, b); } ^~~ (insn 9 8 10 2 (parallel [ (set (reg:DI 91 [ _6 ]) (unspec:DI [ (reg:DI 90 [ _5 ]) (reg:DI 88 [ _3 ]) ] UNSPEC_BEXTR)) (clobber (reg:CC 17 flags)) ]) test.i:2 -1 (nil)) test.i:2:1: internal compiler error: in extract_insn, at recog.c:2287