https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70302
Bug ID: 70302 Summary: crash on valid code at -O2 and -O3 in 32-bit mode on x86_64-linux-gnu (in convert_op, at config/i386/i386.c:3414) Product: gcc Version: 6.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: chengniansun at gmail dot com Target Milestone: --- The following code crashes the trunk at -O2 and -O3 in 32-bit mode (not 64-bit) on x86_64-linux-gnu. $: gcc-trunk -v Using built-in specs. COLLECT_GCC=gcc-trunk COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/6.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto --prefix=/usr/local/gcc-trunk --disable-bootstrap Thread model: posix gcc version 6.0.0 20160318 (experimental) [trunk revision 234330] (GCC) $: $: gcc-trunk -c -w -m32 -O2 small.c small.c: In function ‘fn1’: small.c:14:1: internal compiler error: in convert_op, at config/i386/i386.c:3414 } ^ 0xe815c0 scalar_chain::convert_op(rtx_def**, rtx_insn*) ../../gcc-source-trunk/gcc/config/i386/i386.c:3414 0xe817ae scalar_chain::convert_insn(rtx_insn*) ../../gcc-source-trunk/gcc/config/i386/i386.c:3445 0xea3c92 scalar_chain::convert() ../../gcc-source-trunk/gcc/config/i386/i386.c:3521 0xea44d5 convert_scalars_to_vector ../../gcc-source-trunk/gcc/config/i386/i386.c:3582 0xea44d5 execute ../../gcc-source-trunk/gcc/config/i386/i386.c:3674 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <http://gcc.gnu.org/bugs.html> for instructions. $: $: gcc-trunk -c -w -m32 -O1 small.c $: $: cat small.c long a, c, e; int b, d; unsigned long long f; void fn1(long long p1) { unsigned long long g; int i; for (; i;) if (e) g = c; if (a) f = p1; if (!f && !g) printf("", b, d, d); } $: