https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62300
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> --- Created attachment 33413 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33413&action=edit A testcase [x32@gnu-35 gcc]$ ./xgcc -B./ -S -fPIC -O2 /tmp/x.i -mx32 ../../../../src-trunk/libgcc/config/libbid/bid128_fma.c: In function ‘rounding_correction.constprop’: ../../../../src-trunk/libgcc/config/libbid/bid128_fma.c:33:1: internal compiler error: in as_a, at is-a.h:192 0x781642 rtx_insn* as_a<rtx_insn*, rtx_def>(rtx_def*) ../../src-trunk/gcc/is-a.h:192 0x90b93c assign_parm_setup_reg ../../src-trunk/gcc/function.c:3044 0x90d763 assign_parms ../../src-trunk/gcc/function.c:3453 0x9117cf expand_function_start(tree_node*) ../../src-trunk/gcc/function.c:4809 0x760cd9 execute ../../src-trunk/gcc/cfgexpand.c:5715 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.