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Ip=[4.158.2.129];\n Helo=[outbound-uk1.az.dlp.m.darktrace.com]","X-MS-Exchange-CrossTenant-AuthSource":"\n AMS0EPF00000195.eurprd05.prod.outlook.com","X-MS-Exchange-CrossTenant-AuthAs":"Anonymous","X-MS-Exchange-CrossTenant-FromEntityHeader":"HybridOnPrem","X-BeenThere":"gcc-patches@gcc.gnu.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Gcc-patches mailing list ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"},"content":"Hi,\n\nrespinning\nhttps://gcc.gnu.org/pipermail/gcc-patches/2026-January/706444.html with\nsubconditions of the new if statements reordered, so that the cheaper\ncheck is performed first. OK for trunk?\n\nThanks,\nArtemiy\n\n------------------------>8---------------------\n\nCurrently, simplify_vector_constructor () tries to rewrite a CONSTRUCTOR\nexpression into a VEC_PERM_EXPR, as long as constructor elements all come\nfrom 1 or 2 source vectors. While doing so, it protects against creating\nVEC_PERM_EXPRs unsupported by the target by calling can_vec_perm_const_p\n() before enacting the transformation and bailing when that returns false.\n\nHowever, we can instead allow those VEC_PERM_EXPRs to be created if we\nknow that a later vector lowering pass will legitimize them for us. IOW,\nonly if the target doesn't support the resulting permute and the\nPROP_gimple_lvec property is already set, do we give up. This patch\ninserts the required checks.\n\nThis also allows us to remove the unnecessary vect_int requirement\n(wrongly added in r16-5244-g5a2319b71e4d30) from forwprop-43.c.\n\n(Re-)regtested on aarch64, arm, and x86_64.\n\n\tPR tree-optimization/112679\n\ngcc/ChangeLog:\n\n\t* tree-ssa-forwprop.cc (simplify_vector_constructor): Check the\n\tPROP_gimple_lvec property before returning false.\n\ngcc/testsuite/ChangeLog:\n\n\t* gcc.dg/tree-ssa/forwprop-43.c: Remove the vect_int check.\n---\n gcc/testsuite/gcc.dg/tree-ssa/forwprop-43.c | 1 -\n gcc/tree-ssa-forwprop.cc | 6 ++++--\n 2 files changed, 4 insertions(+), 3 deletions(-)","diff":"diff --git a/gcc/testsuite/gcc.dg/tree-ssa/forwprop-43.c b/gcc/testsuite/gcc.dg/tree-ssa/forwprop-43.c\nindex b144687261b..b7d069bb5b6 100644\n--- a/gcc/testsuite/gcc.dg/tree-ssa/forwprop-43.c\n+++ b/gcc/testsuite/gcc.dg/tree-ssa/forwprop-43.c\n@@ -1,7 +1,6 @@\n /* { dg-do compile } */\n /* { dg-options \"-O2 -fdump-tree-forwprop1 -Wno-psabi\" } */\n /* { dg-require-effective-target stdint_types } */\n-/* { dg-require-effective-target vect_int } */\n /* { dg-additional-options \"-fgimple\" } */\n /* { dg-additional-options \"-msse2\" { target ia32 } } */\n \ndiff --git a/gcc/tree-ssa-forwprop.cc b/gcc/tree-ssa-forwprop.cc\nindex f060275d72d..18b9221908b 100644\n--- a/gcc/tree-ssa-forwprop.cc\n+++ b/gcc/tree-ssa-forwprop.cc\n@@ -4246,7 +4246,8 @@ simplify_vector_constructor (gimple_stmt_iterator *gsi)\n \t\t\t ? 0 : refnelts) + i);\n vec_perm_indices indices (sel, orig[1] ? 2 : 1, refnelts);\n machine_mode vmode = TYPE_MODE (perm_type);\n- if (!can_vec_perm_const_p (vmode, vmode, indices))\n+ if ((cfun->curr_properties & PROP_gimple_lvec)\n+\t && !can_vec_perm_const_p (vmode, vmode, indices))\n \treturn false;\n mask_type = build_vector_type (ssizetype, refnelts);\n tree op2 = vec_perm_indices_to_tree (mask_type, indices);\n@@ -4311,7 +4312,8 @@ simplify_vector_constructor (gimple_stmt_iterator *gsi)\n \t\t\t ? elts[i].second + nelts : i);\n \t vec_perm_indices indices (sel, 2, nelts);\n \t machine_mode vmode = TYPE_MODE (type);\n-\t if (!can_vec_perm_const_p (vmode, vmode, indices))\n+\t if ((cfun->curr_properties & PROP_gimple_lvec)\n+\t && !can_vec_perm_const_p (vmode, vmode, indices))\n \t return false;\n \t mask_type = build_vector_type (ssizetype, nelts);\n \t blend_op2 = vec_perm_indices_to_tree (mask_type, indices);\n","prefixes":["v2"]}