https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82809
--- Comment #3 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> --- Author: rsandifo Date: Fri Nov 3 09:24:28 2017 New Revision: 254366 URL: https://gcc.gnu.org/viewcvs?rev=254366&root=gcc&view=rev Log: PR82809: register handling in ix86_vector_duplicate_value When adding the call to gen_vec_duplicate, I failed to notice that code further down modified the VEC_DUPLICATE in place. That isn't safe if gen_vec_duplicate returned a const_vector. 2017-11-02 Richard Sandiford <richard.sandif...@linaro.org> gcc/ PR target/82809 * config/i386/i386.c (ix86_vector_duplicate_value): Use gen_vec_duplicate after forcing the scalar into a register. gcc/testsuite/ * gcc.dg/pr82809.c: New test. Added: trunk/gcc/testsuite/gcc.dg/pr82809.c Modified: trunk/gcc/ChangeLog trunk/gcc/config/i386/i386.c trunk/gcc/testsuite/ChangeLog