https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98221
--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-10 branch has been updated by Richard Biener <rgue...@gcc.gnu.org>: https://gcc.gnu.org/g:ecab0d9106a317073f5891f161f031078d835b2f commit r10-9253-gecab0d9106a317073f5891f161f031078d835b2f Author: Andreas Krebbel <kreb...@gcc.gnu.org> Date: Mon Jan 11 10:59:43 2021 +0100 tree-optimization/98221 - fix wrong unpack operation used for big-endian The vec-abi-varargs-1.c testcase on IBM Z currently fails. While adding an SI mode vector to a DI mode vector the first is unpacked using: _28 = BIT_INSERT_EXPR <{ 0, 0, 0, 0 }, _2, 0>; _34 = [vec_unpack_lo_expr] _28; However, on big endian targets lo refers to the right hand side of the vector - in this case the zeroes. 2021-01-11 Andreas Krebbel <kreb...@linux.ibm.com> PR tree-optimization/98221 * tree-ssa-forwprop.c (simplify_vector_constructor): For big-endian, use UNPACK[_FLOAT]_HI. (cherry picked from commit 300a3ce5c5695eb1a7c0476e9d1b45420a463248)
