From: Richard Sandiford Date: Tue, 9 Jan 2018 14:30:27 +0000 (+0000) Subject: Fix permute handling when vectorising scatters X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=7ad429a4de1197b4b032da0981a2c91ac5d0dd06;p=gcc.git Fix permute handling when vectorising scatters As mentioned in https://gcc.gnu.org/ml/gcc-patches/2017-11/msg01575.html , the scatter handling in vectorizable_store seems to be dead code at the moment. Enabling it with the vect_analyze_data_ref_access part of that patch triggered an ICE in the avx512f-scatter-*.c tests (which previously didn't use scatters). The problem was that the NARROW and WIDEN handling uses permute_vec_elements to marshal the inputs, and permute_vec_elements expected the lhs of the stmt to be an SSA_NAME, which of course it isn't for stores. This patch makes permute_vec_elements create a fresh variable in this case. 2018-01-09 Richard Sandiford gcc/ * tree-vect-stmts.c (permute_vec_elements): Create a fresh variable if the destination isn't an SSA_NAME. From-SVN: r256383 --- diff --git a/gcc/ChangeLog b/gcc/ChangeLog index f908b7cc2cc..d3c313d8329 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2018-01-09 Richard Sandiford + + * tree-vect-stmts.c (permute_vec_elements): Create a fresh variable + if the destination isn't an SSA_NAME. + 2018-01-09 Richard Biener PR tree-optimization/83668 diff --git a/gcc/tree-vect-stmts.c b/gcc/tree-vect-stmts.c index 16088b080fe..a4f2d713959 100644 --- a/gcc/tree-vect-stmts.c +++ b/gcc/tree-vect-stmts.c @@ -6585,7 +6585,11 @@ permute_vec_elements (tree x, tree y, tree mask_vec, gimple *stmt, tree perm_dest, data_ref; gimple *perm_stmt; - perm_dest = vect_create_destination_var (gimple_get_lhs (stmt), vectype); + tree scalar_dest = gimple_get_lhs (stmt); + if (TREE_CODE (scalar_dest) == SSA_NAME) + perm_dest = vect_create_destination_var (scalar_dest, vectype); + else + perm_dest = vect_get_new_vect_var (vectype, vect_simple_var, NULL); data_ref = make_ssa_name (perm_dest); /* Generate the permute statement. */