https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92768
--- Comment #16 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> --- Author: rsandifo Date: Thu Dec 5 14:20:38 2019 New Revision: 279002 URL: https://gcc.gnu.org/viewcvs?rev=279002&root=gcc&view=rev Log: Check for bitwise identity when encoding VECTOR_CSTs (PR 92768) This PR shows that we weren't checking for bitwise-identical values when trying to encode a VECTOR_CST, so -0.0 was treated the same as 0.0 for -fno-signed-zeros. The patch adds a new OEP flag to select that behaviour. 2019-12-05 Richard Sandiford <richard.sandif...@arm.com> gcc/ PR middle-end/92768 * tree-core.h (OEP_BITWISE): New flag. * fold-const.c (operand_compare::operand_equal_p): Handle it. * tree-vector-builder.h (tree_vector_builder::equal_p): Pass it. gcc/testsuite/ PR middle-end/92768 * gcc.dg/pr92768.c: New test. Added: trunk/gcc/testsuite/gcc.dg/pr92768.c Modified: trunk/gcc/ChangeLog trunk/gcc/fold-const.c trunk/gcc/testsuite/ChangeLog trunk/gcc/tree-core.h trunk/gcc/tree-vector-builder.h
